Form 8-K - Current report

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (date of earliest event reported): January 31, 2025

ONEOK, Inc.
(Exact name of registrant as specified in its charter)

Oklahoma		001-13643		73-1520922
(State or other jurisdiction of incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

100 West Fifth Street; Tulsa, OK
(Address of principal executive offices)

74103
(Zip Code)

(918) 588-7000
(Registrant’s telephone number, including area code)

Not Applicable
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

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Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

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Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading symbol(s)		Name of each exchange on which registered
Common stock, par value of $0.01		OKE		New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Introductory Note

On January 31, 2025 (the “Closing Date”), (i) Elk Merger Sub I, L.L.C. (“Merger Sub I”), a Delaware limited liability company and direct, wholly-owned subsidiary of ONEOK, Inc., an Oklahoma corporation (“ONEOK”), merged (the “First Merger”) with and into EnLink Midstream, LLC, a Delaware limited liability company (“EnLink”), with EnLink surviving the First Merger, and (ii) promptly following the First Merger, EnLink, as the surviving entity in the First Merger, merged (the “Second Merger” and, together with the First Merger, the “Mergers”) with and into Elk Merger Sub II, L.L.C. (“Merger Sub II”), a Delaware limited liability company and direct, wholly-owned subsidiary of ONEOK, with Merger Sub II surviving the Second Merger as a direct, wholly-owned subsidiary of ONEOK. The Mergers were effected pursuant to the Agreement and Plan of Merger, dated as of November 24, 2024, by and among ONEOK, Merger Sub I, Merger Sub II, EnLink and EnLink Midstream Manager, LLC, the managing member of EnLink.

As previously announced, following the completion of the Mergers on the Closing Date, ONEOK effected an internal reorganization of the entities acquired pursuant to the First Merger (the “Internal Reorganization”).

Item 1.01 Entry into a Material Definitive Agreement.

Supplemental Indentures

On the Closing Date, in connection with the Second Merger, Merger Sub II, EnLink Midstream Partners, LP, a Delaware limited partnership (“ENLK”), and Computershare Trust Company, N.A., as trustee (“Computershare”), entered into a supplemental indenture to each of the respective indentures governing EnLink’s outstanding 5.625% Senior Notes due 2028, 5.375% Senior Notes due 2029, 6.500% Senior Notes due 2030 and 5.650% Senior Notes due 2034 (collectively, the “Assumed EnLink Notes”). Pursuant to each supplemental indenture, Merger Sub II assumed all of the obligations of EnLink, and EnLink was released from its obligations, under the applicable indenture supplemented thereby and with respect to the applicable series of Assumed EnLink Notes issued thereunder, and ENLK confirmed its guarantee of the applicable series of Assumed EnLink Notes issued under such indenture.

The foregoing description of such supplemental indentures does not purport to be complete and is qualified in its entirety by reference to the full text of such supplemental indentures, copies of which are filed as Exhibits 4.1, 4.2, 4.3, and 4.4 to this Current Report on Form 8-K (this “Current Report”) and are incorporated herein by reference.

On the Closing Date, in connection with the Internal Reorganization, ONEOK, ONEOK Partners, L.P., a Delaware limited partnership (“ONEOK Partners”), ONEOK Partners Intermediate Limited Partnership, a Delaware limited partnership (“Intermediate Partnership”), Magellan Midstream Partners, L.P., a Delaware limited partnership (“Magellan”), Merger Sub II, ENLK and Computershare, as trustee, entered into a supplemental indenture to each of the respective indentures governing the Assumed EnLink Notes. Pursuant to each supplemental indenture, ONEOK assumed all of the obligations of Merger Sub II, and Merger Sub II was released from its obligations, under the applicable indenture supplemented thereby and with respect to the applicable series of Assumed EnLink Notes issued thereunder, ENLK confirmed its guarantee of the applicable series of Assumed EnLink Notes issued under such indenture, and each of ONEOK Partners, Intermediate Partnership, Magellan and Merger Sub II provided a guarantee of the applicable series of Assumed EnLink Notes issued under such indenture.

The foregoing description of such supplemental indentures does not purport to be complete and is qualified in its entirety by reference to the full text of such supplemental indentures, copies of which are filed as Exhibits 4.5, 4.6, 4.7, and 4.8 to this Current Report and are incorporated herein by reference.

On the Closing Date, in connection with the Internal Reorganization, ONEOK, ONEOK Partners, Intermediate Partnership, Magellan, Merger Sub II, ENLK and Computershare, as trustee, entered into a supplemental indenture to the indenture governing ENLK’s outstanding 4.150% Senior Notes due 2025, 4.850% Senior Notes due 2026, 5.600% Senior Notes due 2044, 5.050% Senior Notes due 2045 and 5.450% Senior Notes due 2047 (collectively, the “Assumed ENLK Notes”). Pursuant to such supplemental indenture, ONEOK assumed all of the obligations of ENLK, and ENLK was released from its obligations under, such indenture and with respect to the Assumed ENLK Notes, and each of ONEOK Partners, Intermediate Partnership, Magellan, Merger Sub II and ENLK provided a guarantee of the Assumed ENLK Notes issued under such indenture.

The foregoing description of such supplemental indenture does not purport to be complete and is qualified in its entirety by reference to the full text of such supplemental indenture, a copy of which is filed as Exhibit 4.9 to this Current Report and is incorporated by reference herein.

On the Closing Date, in connection with the Internal Reorganization, ONEOK, ONEOK Partners, Intermediate Partnership, Magellan, Merger Sub II, ENLK and the respective trustees entered into a supplemental indenture to each of the respective indentures governing ONEOK’s currently outstanding senior notes (collectively, the “Outstanding ONEOK Notes”) pursuant to which each of Merger Sub II and ENLK provided a guarantee of the applicable series of Outstanding ONEOK Notes issued under such indenture.

The foregoing description of such supplemental indentures does not purport to be complete and is qualified in its entirety by reference to the full text of such supplemental indentures, copies of which are filed as Exhibits 4.10, 4.11, 4.12, 4.13 and 4.14 to this Current Report and are incorporated herein by reference.

On the Closing Date, in connection with the Internal Reorganization, ONEOK Partners, ONEOK, Intermediate Partnership, Magellan, Merger Sub II, ENLK and Computershare, as trustee, entered into a supplemental indenture to the indenture governing ONEOK Partners’ currently outstanding senior notes (collectively, the “Outstanding ONEOK Partners Notes”) pursuant to which each of Merger Sub II and ENLK provided a guarantee of the Outstanding ONEOK Partners Notes issued under such indenture.

The foregoing description of such supplemental indenture does not purport to be complete and is qualified in its entirety by reference to the full text of such supplemental indenture, a copy of which is filed as Exhibit 4.15 to this Current Report and is incorporated by reference herein.

ONEOK Credit Agreement Guarantee

On the Closing Date, in connection with the Internal Reorganization, Merger Sub II and ENLK entered into a guarantee agreement (the “ONEOK Credit Agreement Guarantee”) guaranteeing the obligations of ONEOK under its amended and restated credit agreement, dated as of June 10, 2022 (as amended by that certain First Amendment to Amended and Restated Credit Agreement, dated as of May 26, 2023, the “ONEOK Credit Agreement”) with ONEOK, Citibank, N.A., as administrative agent, swingline lender, a letter of credit issuer and a lender, and the other lenders, swingline lenders and letter of credit issuers parties thereto, which guarantee became effective in connection with the completion of the Second Merger and the satisfaction of the other conditions precedent set forth in the ONEOK Credit Agreement. Under the ONEOK Credit Agreement Guarantee, Merger Sub II and ENLK will be liable for ONEOK’s obligations under the ONEOK Credit Agreement. Any such liabilities will be senior unsecured obligations of Merger Sub II and ENLK and will rank equally in right of payment with all existing and future senior unsecured indebtedness of Merger Sub II and ENLK.

The foregoing description of the ONEOK Credit Agreement Guarantee does not purport to be complete and is qualified in its entirety by reference to the full text of the ONEOK Credit Agreement Guarantee, a copy of which has been filed as Exhibit 10.1 to this Current Report and which is incorporated by reference herein.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On February 3, 2025, Charles M. Kelley, Senior Vice President, Commercial Natural Gas Pipelines and a named executive officer in our most recent proxy statement, provided notice of his intention to retire effective March 31, 2025.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit Number		Description

4.1		First Supplemental Indenture, dated as of January 31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed with the SEC on January 31, 2025, File No. 001-36336).

4.2		Second Supplemental Indenture, dated as of January 31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed with the SEC on January 31, 2025, File No. 001-36336).

4.3		First Supplemental Indenture, dated as of January 31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.3 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed with the SEC on January 31, 2025, File No. 001-36336).

4.4		Second Supplemental Indenture, dated as of January 31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.4 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed with the SEC on January 31, 2025, File No. 001-36336).

4.5		Third Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and Computershare Trust Company, N.A., as trustee.

4.6		Second Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and Computershare Trust Company, N.A., as trustee.

4.7		Second Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and Computershare Trust Company, N.A., as trustee.

4.8		Third Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and Computershare Trust Company, N.A., as trustee.

4.9		Sixth Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and Computershare Trust Company, N.A., as trustee.

4.10		Seventh Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C. and The Bank of New York Mellon Trust Company, National Association, as trustee.

4.11		Fourteenth Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., and U.S. Bank Trust Company, National Association, as trustee.

4.12		Fourth Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., and U.S. Bank Trust Company, National Association, as trustee.

4.13		Sixth Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C. and U.S. Bank Trust Company, National Association, as trustee.

4.14		Thirty-Second Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C. and U.S. Bank Trust Company, National Association, as trustee.

4.15		Seventeenth Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, ONEOK, Inc., Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., and Computershare Trust Company, N.A., as trustee.

10.1		Guaranty Agreement, dated as of January 31, 2025, by and between Elk Merger Sub II, L.L.C. and EnLink Midstream Partners, LP, in favor of Citibank, N.A., as administrative agent, under the Credit Agreement, dated as of June 10, 2022, by and among ONEOK, Inc., Citibank, N.A. and the other lenders parties thereto.

104		Cover Page Interactive Data File - the cover page XBRL tags are embedded within the Inline XBRL document (contained in Exhibit 101).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	ONEOK, INC.

Date: February 5, 2025	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor Relations and Corporate Development

Exhibit 4.5

ONEOK, INC.,

as Issuer,

ELK MERGER SUB II, L.L.C.,

ENLINK MIDSTREAM PARTNERS, LP,

ONEOK Partners, L.P.,

ONEOK Partners Intermediate Limited Partnership,

and

Magellan Midstream Partners, L.P.,

as Guarantors, and

COMPUTERSHARE TRUST COMPANY, N.A.,

as Trustee

THIRD SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

Indenture dated as of April 9, 2019

5.375% Senior Notes due 2029

Table of Contents

		Page

Section 1	Capitalized Terms.	3

Section 2	Assumption; Succession; Confirmation of Guarantee.	3

Section 3	Guarantee.	3

Section 4	Ratification and Effect.	3

Section 5	Governing Law.	3

Section 6	The Trustee.	3

Section 7	Conflicts.	4

Section 8	Miscellaneous.	4

Section 9	Counterparts.	4

THIS THIRD SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Third Supplemental Indenture”), is among ONEOK, Inc., an Oklahoma corporation (the “New Issuer”), Elk Merger Sub II, L.L.C., a Delaware limited liability company and the predecessor issuer (“Merger Sub II”), EnLink Midstream Partners, LP, a Delaware limited partnership (the “Existing Guarantor”), ONEOK Partners, L.P., a Delaware limited partnership (“ONEOK Partners”), ONEOK Partners Intermediate Limited Partnership, a Delaware limited partnership (“ONEOK ILP”), Magellan Midstream Partners, L.P., a Delaware limited partnership (“Magellan” and, collectively with Merger Sub II, ONEOK Partners and ONEOK ILP, the “New Guarantors” and, each, a “New Guarantor” and, together with the Existing Guarantor, the “Guarantors”), and Computershare Trust Company, N.A., as successor trustee to Wells Fargo Bank, National Association, under the Indenture referred to below (the “Trustee”).

RECITALS

WHEREAS, EnLink Midstream, LLC, a Delaware limited liability company (the “Original Issuer”), the Existing Guarantor, and the Trustee have entered into that certain Indenture, dated as of April 9, 2019 (the “Base Indenture”), as amended and supplemented by the First Supplemental Indenture, dated as of April 9, 2019, among the Original Issuer, the Existing Guarantor, and the Trustee (the “First Supplemental Indenture”), pursuant to which the Original Issuer has issued its 5.375% Senior Notes due 2029 (the “Debt Securities”), as amended and supplemented by the Second Supplemental Indenture, dated as of January 31, 2025, among Merger Sub II, as successor to the Original Issuer, the Existing Guarantor, and the Trustee (the “Second Supplemental Indenture” and, together with the Base Indenture, the First Supplemental Indenture, and this Third Supplemental Indenture, the “Indenture”), pursuant to which Merger Sub II assumed and succeeded to the obligations of the Original Issuer under the Indenture and the Debt Securities pursuant to Article X of the Base Indenture;

WHEREAS, in accordance with the terms and conditions of the Agreement and Plan of Merger, dated as of November 24, 2024, by and among the New Issuer, Elk Merger Sub I, L.L.C., a Delaware limited liability company and a direct, wholly-owned subsidiary of the New Issuer (“Merger Sub I”), Merger Sub II, the Original Issuer, and EnLink Midstream Manager, LLC, a Delaware limited liability company and the managing member of the Original Issuer, on the date hereof, (i) Merger Sub I merged with and into the Original Issuer (the “First Merger”), with the Original Issuer surviving the First Merger and (ii) promptly following the First Merger and as part of the same overall transaction as the First Merger, at the effective time of the Second Merger (as defined below), the Original Issuer, as the surviving entity in the First Merger, merged with and into Merger Sub II (the “Second Merger” and, together with the First Merger, the “Mergers”), with Merger Sub II surviving the Second Merger as a direct, wholly-owned subsidiary of the New Issuer;

WHEREAS, on the date hereof and promptly following the Mergers, Merger Sub II and the Existing Guarantor became guarantors of, and provided a guarantee for certain of the outstanding debt securities of the New Issuer and ONEOK Partners;

WHEREAS, on the date hereof and promptly following the Mergers, pursuant to the Distribution Agreement, dated as of January 31, 2025, by and among the Existing Guarantor, EnLink Midstream GP, LLC, a Delaware limited liability company and the general partner of the Existing Guarantor, Merger Sub II and the New Issuer, substantially all of the assets of Merger Sub II were distributed to the New Issuer in a series of related transactions (collectively, the “Distribution”);

WHEREAS, in connection with the Distribution, the New Issuer desires to assume and succeed to the obligations of Merger Sub II under the Indenture and the Debt Securities pursuant to Article X of the Base Indenture;

WHEREAS, in connection with the Distribution, the Existing Guarantor desires to confirm that its Guarantee shall continue to apply to the obligations under the Debt Securities and the Indenture;

WHEREAS, in connection with the Distribution, the New Guarantors, each a Subsidiary of the New Issuer, desire to unconditionally guarantee all of the New Issuer’s obligations under each series of Debt Securities in accordance with Article XIV of the Base Indenture (each, a “Debt Security Guarantee”);

WHEREAS, in accordance with Section 9.01(a) of the Base Indenture, the Base Indenture may be supplemented without the consent of the Holders of any of the Debt Securities (which shall conform to the provisions of the Trust Indenture Act of 1939, as amended (the “TIA”) as in force at the date of the execution thereof) to provide for, among other things, (i) the assumption by a Successor Company of the covenants, agreements, and obligations of Merger Sub II under the Indenture and the Debt Securities pursuant to Article X of the Base Indenture, and (ii) the addition of Subsidiary Guarantors with respect to any or all of the Debt Securities;

WHEREAS, Section 10.02 of the Base Indenture provides that in the case of any transaction in accordance with Section 10.01 of the Base Indenture, and upon such assumption by the successor entity, by supplemental indenture, the New Issuer shall succeed to and be substituted for Merger Sub II with the same effect as if the New Issuer had been named the “Company” in the Indenture;

WHEREAS, (i) in accordance with Section 10.01 of the Base Indenture, (A) the New Issuer is delivering this Third Supplemental Indenture to expressly assume all the obligations of Merger Sub II under the Indenture and the Debt Securities, and (B) the Existing Guarantor is delivering this Third Supplemental Indenture to expressly confirm that its Guarantee shall continue to apply to the obligations under the Debt Securities and the Indenture; and (ii) in accordance with Section 9.01(a) of the Base Indenture, the New Guarantors are delivering this Third Supplemental Indenture to become Subsidiary Guarantors with respect to, and provide Guarantees of, the Debt Securities;

WHEREAS, the New Issuer, has delivered or is delivering to the Trustee an Officers’ Certificate and an Opinion of Counsel required by Sections 9.03, 10.01(d) and 13.05 of the Base Indenture; and

WHEREAS, all requirements necessary to make this Third Supplemental Indenture a valid, binding and enforceable instrument in accordance with its terms have been done and performed, and the execution and delivery of this Third Supplemental Indenture has been duly authorized in all respects.

NOW, THEREFORE, in consideration of the premises hereof, the parties have executed and delivered this Third Supplemental Indenture, and the New Issuer, the Guarantors and the Trustee agree for the benefit of each other and for the equal and ratable benefit of the Holders of the Debt Securities, as follows:

Section 1 Capitalized Terms.

Any capitalized term used and not otherwise defined herein shall have the meaning assigned to such term in the Indenture.

Section 2 Assumption; Succession; Confirmation of Guarantee.

The New Issuer hereby expressly assumes all the obligations of Merger Sub II under the Indenture and the Debt Securities, as if the New Issuer had been named in the Indenture as the “Company” and the Existing Guarantor hereby expressly confirms that its Guarantee shall continue to apply to the obligations under the Debt Securities and the Indenture.

Section 3 Guarantee.

Each New Guarantor hereby provides the Debt Security Guarantee with respect to each series of Debt Securities, on the terms and subject to the conditions set forth in the Indenture, including but not limited to Article XIV of the Base Indenture.

Section 4 Ratification and Effect.

Except as expressly amended by this Third Supplemental Indenture, the Indenture is in all respects ratified and confirmed and all of the terms, provisions, and conditions thereof shall be and remain in full force and effect. Upon and after execution and delivery of this Third Supplemental Indenture, the Indenture shall be supplemented in accordance herewith, this Third Supplemental Indenture shall form a part of the Indenture for all purposes, each reference in the Indenture and the Debt Securities to the Indenture shall mean and be a reference to the Indenture as amended hereby, and each reference in the Indenture and the Debt Securities to EnLink Midstream, LLC, Elk Merger Sub II, L.L.C. or the Company shall mean and be a reference to ONEOK, Inc., as the Successor Company.

Section 5 Governing Law.

THIS THIRD SUPPLEMENTAL INDENTURE FOR ALL PURPOSES SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS ENTERED INTO AND TO BE PERFORMED IN SUCH STATE.

Section 6 The Trustee.

The recitals in this Third Supplemental Indenture shall be taken as the statements of the New Issuer and the Guarantors, and the Trustee assumes no responsibility for their correctness. The Trustee shall not be responsible or accountable in any manner whatsoever for or with respect to the validity or sufficiency of this Third Supplemental Indenture. The Trustee shall be under no duty whatsoever to make any determination whether any execution, modification, amendment, supplement, or confirmation to any document is necessary to implement the provisions of this Third Supplemental Indenture, and shall be entitled to conclusively rely on the documentation required to be provided under the terms of the Indenture in a form reasonably satisfactory to the Trustee. All of the provisions contained in the Indenture in respect of the rights, privileges, immunities, powers, and duties of the Trustee shall be applicable in respect of this Third Supplemental Indenture as fully and with like force and effect as though fully set forth in full herein.

Section 7 Conflicts.

To the extent of any inconsistency between the terms of the Indenture or the Debt Securities and this Third Supplemental Indenture, the terms of this Third Supplemental Indenture will control. If and to the extent any provision of this Third Supplemental Indenture limits, qualifies, or conflicts with any other provision of this Third Supplemental Indenture that is required to be included in this Third Supplemental Indenture or is deemed applicable to the Indenture by virtue of the provisions of the TIA, such required provision shall control.

Section 8 Miscellaneous.

This Third Supplemental Indenture, the Second Supplemental Indenture and the First Supplemental Indenture constitute the entire agreement of the parties hereto with respect to the amendments to the Base Indenture set forth in each such supplement. All covenants and agreements in this Third Supplemental Indenture given by the parties hereto shall bind their successors. In case any provision in this Third Supplemental Indenture shall be invalid, illegal, or unenforceable, the validity, legality and enforceability of the remaining provisions hereof or of the Indenture shall not in any way be affected or impaired thereby. The section headings are for convenience only and shall not affect the construction hereof.

Section 9 Counterparts.

This Third Supplemental Indenture shall be valid, binding, and enforceable against a party only when executed and delivered by an authorized individual on behalf of the party by means of (i) any electronic signature permitted by the federal Electronic Signatures in Global and National Commerce Act, state enactments of the Uniform Electronic Transactions Act, and/or any other relevant electronic signatures law, including relevant provisions of the Uniform Commercial Code/UCC (collectively, “Signature Law”); (ii) an original manual signature; or (iii) a faxed, scanned, or photocopied manual signature. Each electronic signature or faxed, scanned, or photocopied manual signature shall for all purposes have the same validity, legal effect, and admissibility in evidence as an original manual signature. Each party hereto shall be entitled to conclusively rely upon, and shall have no liability with respect to, any faxed, scanned, or photocopied manual signature, or other electronic signature, of any party and shall have no duty to investigate, confirm or otherwise verify the validity or authenticity thereof. This Third Supplemental Indenture may be executed in any number of counterparts, each of which shall be deemed to be an original, but such counterparts shall, together, constitute one and the same instrument. For avoidance of doubt, original manual signatures shall be used for execution or endorsement of writings when required under the UCC or other Signature Law due to the character or intended character of the writings.

Signature page follows.

IN WITNESS WHEREOF, the parties hereto have caused this Third Supplemental Indenture to be duly executed as of the date first written above.

	ISSUER:

	ONEOK, INC.

	By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

	GUARANTORS:

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

[Signature Page to ENLC Third Supplemental Indenture (2019 Indenture)]

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

[Signature Page to ENLC Third Supplemental Indenture (2019 Indenture)]

	TRUSTEE:

	COMPUTERSHARE TRUST COMPANY, N.A., as Trustee

	By:	/s/ Corey J. Dahlstrand
	Name:	Corey J. Dahlstrand
	Title:	Vice President

[Signature Page to ENLC Third Supplemental Indenture (2019 Indenture)]

Exhibit 4.6

ONEOK, INC.,

as Issuer,

ELK MERGER SUB II, L.L.C.,

ENLINK MIDSTREAM PARTNERS, LP,

ONEOK PARTNERS, L.P.,

ONEOK PARTNERS INTERMEDIATE LIMITED PARNTERSHIP,

and

MAGELLAN MIDSTREAM PARTNERS, L.P.,

as Guarantors, and

COMPUTERSHARE TRUST COMPANY, N.A.,

as Trustee

SECOND SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

Indenture dated as of December 17, 2020

5.625% Senior Notes due 2028

Table of Contents

		Page

Section 1	Capitalized Terms.	3

Section 2	Assumption; Succession; Confirmation of Guarantee.	3

Section 3	Guarantee.	3

Section 4	Ratification and Effect.	3

Section 5	Governing Law.	3

Section 6	The Trustee.	3

Section 7	Conflicts.	4

Section 8	Miscellaneous.	4

Section 9	Counterparts.	4

THIS SECOND SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Second Supplemental Indenture”), is among ONEOK, Inc., an Oklahoma corporation (the “New Issuer”), Elk Merger Sub II, L.L.C., a Delaware limited liability company and the predecessor issuer (“Merger Sub II”), EnLink Midstream Partners, LP, a Delaware limited partnership (the “Existing Guarantor”), ONEOK Partners, L.P., a Delaware limited partnership (“ONEOK Partners”), ONEOK Partners Intermediate Limited Partnership, a Delaware limited partnership (“ONEOK ILP”), Magellan Midstream Partners, L.P., a Delaware limited partnership (“Magellan” and, collectively with Merger Sub II, ONEOK Partners and ONEOK ILP, the “New Guarantors” and, each, a “New Guarantor” and, together with the Existing Guarantor, the “Guarantors”), and Computershare Trust Company, N.A., as successor trustee to Wells Fargo Bank, National Association, under the Indenture referred to below (the “Trustee”).

RECITALS

WHEREAS, EnLink Midstream, LLC, a Delaware limited liability company (the “Original Issuer”), the Existing Guarantor, and the Trustee have entered into that certain Indenture, dated as of December 17, 2020 (the “Base Indenture”), pursuant to which the Original Issuer has issued its 5.625% Senior Notes due 2028 (the “Notes”), as amended and supplemented by the First Supplemental Indenture, dated as of January 31, 2025, among Merger Sub II, as successor to the Original Issuer, the Existing Guarantor, and the Trustee (the “First Supplemental Indenture” and, together with the Base Indenture and this Second Supplemental Indenture, the “Indenture”), pursuant to which Merger Sub II assumed and succeeded to the obligations of the Original Issuer under the Indenture and the Notes pursuant to Article X of the Base Indenture;

WHEREAS, in connection with the Distribution, the New Issuer desires to assume and succeed to the obligations of Merger Sub II under the Indenture and the Notes pursuant to Article X of the Base Indenture;

WHEREAS, in connection with the Distribution, the Existing Guarantor desires to confirm that its Guarantee shall continue to apply to the obligations under the Notes and the Indenture;

WHEREAS, in connection with the Distribution, the New Guarantors, each a subsidiary of the New Issuer, desire to unconditionally guarantee all of the New Issuer’s obligations under each series of Notes in accordance with Article XIV of the Base Indenture (each, a “Note Guarantee”);

WHEREAS, in accordance with Section 9.01(a) of the Base Indenture, the Base Indenture may be supplemented without the consent of the Holders of any of the Notes (which shall conform to the provisions of the Trust Indenture Act of 1939, as amended (the “TIA”) as in force at the date of the execution thereof) to provide for, among other things, (i) the assumption by a Successor Company of the covenants, agreements, and obligations of Merger Sub II under the Indenture and the Notes, pursuant to Article X of the Base Indenture, and (ii) the addition of Subsidiary Guarantors with respect to any or all of the Notes;

WHEREAS, (i) in accordance with Section 10.01 of the Base Indenture, (A) the New Issuer is delivering this Second Supplemental Indenture to expressly assume all the obligations of Merger Sub II under the Indenture and the Notes, and (B) the Existing Guarantor is delivering this Second Supplemental Indenture to expressly confirm that its Guarantee shall continue to apply to the obligations under the Notes and the Indenture, and (ii) in accordance with Section 9.01(a) of the Base Indenture, the New Guarantors are delivering this Second Supplemental Indenture to become Subsidiary Guarantors with respect to , and provide Guarantees of, the Notes;

WHEREAS, the New Issuer, has delivered or is delivering to the Trustee an Officers’ Certificate and an Opinion of Counsel required by Sections 9.03, 10.01(d) and 13.05 of the Base Indenture; and

WHEREAS, all requirements necessary to make this Second Supplemental Indenture a valid, binding and enforceable instrument in accordance with its terms have been done and performed, and the execution and delivery of this Second Supplemental Indenture has been duly authorized in all respects.

NOW, THEREFORE, in consideration of the premises hereof, the parties have executed and delivered this Second Supplemental Indenture, and the New Issuer, the Guarantors and the Trustee agree for the benefit of each other and for the equal and ratable benefit of the Holders of the Notes, as follows:

Section 1 Capitalized Terms.

Any capitalized term used and not otherwise defined herein shall have the meaning assigned to such term in the Indenture.

Section 2 Assumption; Succession; Confirmation of Guarantee.

The New Issuer hereby expressly assumes all the obligations of Merger Sub II under the Indenture and the Notes, as if the New Issuer had been named in the Indenture as the “Company” and the Existing Guarantor hereby expressly confirms that its Guarantee shall continue to apply to the obligations under the Notes and the Indenture.

Section 3 Guarantee.

Each New Guarantor hereby provides the Note Guarantee with respect to each series of Notes, on the terms and subject to the conditions set forth in the Indenture, including but not limited to Article XIV of the Base Indenture.

Section 4 Ratification and Effect.

Except as expressly amended by this Second Supplemental Indenture, the Indenture is in all respects ratified and confirmed and all of the terms, provisions, and conditions thereof shall be and remain in full force and effect. Upon and after execution and delivery of this Second Supplemental Indenture, the Indenture shall be supplemented in accordance herewith, this Second Supplemental Indenture shall form a part of the Indenture for all purposes, each reference in the Indenture and the Notes to the Indenture shall mean and be a reference to the Indenture as amended hereby, and each reference in the Indenture and the Notes to EnLink Midstream, LLC, Elk Merger Sub II, L.L.C. or the Company shall mean and be a reference to ONEOK, Inc., as the Successor Company.

Section 5 Governing Law.

THIS SECOND SUPPLEMENTAL INDENTURE FOR ALL PURPOSES SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS ENTERED INTO AND TO BE PERFORMED IN SUCH STATE.

Section 6 The Trustee.

The recitals in this Second Supplemental Indenture shall be taken as the statements of the New Issuer and the Guarantors, and the Trustee assumes no responsibility for their correctness. The Trustee shall not be responsible or accountable in any manner whatsoever for or with respect to the validity or sufficiency of this Second Supplemental Indenture. The Trustee shall be under no duty whatsoever to make any determination whether any execution, modification, amendment, supplement, or confirmation to any document is necessary to implement the provisions of this Second Supplemental Indenture, and shall be entitled to conclusively rely on the documentation required to be provided under the terms of the Indenture in a form reasonably satisfactory to the Trustee. All of the provisions contained in the Indenture in respect of the rights, privileges, immunities, powers, and duties of the Trustee shall be applicable in respect of this Second Supplemental Indenture as fully and with like force and effect as though fully set forth in full herein.

Section 7 Conflicts.

To the extent of any inconsistency between the terms of the Indenture or the Notes and this Second Supplemental Indenture, the terms of this Second Supplemental Indenture will control. If and to the extent any provision of this Second Supplemental Indenture limits, qualifies, or conflicts with any other provision of this Second Supplemental Indenture that is required to be included in this Second Supplemental Indenture or is deemed applicable to the Indenture by virtue of the provisions of the TIA, such required provision shall control.

Section 8 Miscellaneous.

This Second Supplemental Indenture and the First Supplemental Indenture constitute the entire agreement of the parties hereto with respect to the amendments to the Base Indenture set forth in each such supplement. All covenants and agreements in this Second Supplemental Indenture given by the parties hereto shall bind their successors. In case any provision in this Second Supplemental Indenture shall be invalid, illegal, or unenforceable, the validity, legality and enforceability of the remaining provisions hereof or of the Indenture shall not in any way be affected or impaired thereby. The section headings are for convenience only and shall not affect the construction hereof.

Section 9 Counterparts.

This Second Supplemental Indenture shall be valid, binding, and enforceable against a party only when executed and delivered by an authorized individual on behalf of the party by means of (i) any electronic signature permitted by the federal Electronic Signatures in Global and National Commerce Act, state enactments of the Uniform Electronic Transactions Act, and/or any other relevant electronic signatures law, including relevant provisions of the Uniform Commercial Code/UCC (collectively, “Signature Law”); (ii) an original manual signature; or (iii) a faxed, scanned, or photocopied manual signature. Each electronic signature or faxed, scanned, or photocopied manual signature shall for all purposes have the same validity, legal effect, and admissibility in evidence as an original manual signature. Each party hereto shall be entitled to conclusively rely upon, and shall have no liability with respect to, any faxed, scanned, or photocopied manual signature, or other electronic signature, of any party and shall have no duty to investigate, confirm or otherwise verify the validity or authenticity thereof. This Second Supplemental Indenture may be executed in any number of counterparts, each of which shall be deemed to be an original, but such counterparts shall, together, constitute one and the same instrument. For avoidance of doubt, original manual signatures shall be used for execution or endorsement of writings when required under the UCC or other Signature Law due to the character or intended character of the writings.

Signature page follows.

IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental Indenture to be duly executed as of the date first written above.

	ISSUER:

	ONEOK, INC.

	By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

	GUARANTORS:

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

[Signature Page to ENLC Second Supplemental Indenture (2020 Indenture)]

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

[Signature Page to ENLC Second Supplemental Indenture (2020 Indenture)]

	TRUSTEE:

	COMPUTERSHARE TRUST COMPANY, N.A.,
	as Trustee

	By:	/s/ Corey J. Dahlstrand
	Name:	Corey J. Dahlstrand
	Title:	Vice President

[Signature Page to ENLC Second Supplemental Indenture (2020 Indenture)]

Exhibit 4.7

ONEOK, INC.,

as Issuer,

ELK MERGER SUB II, L.L.C.,

ENLINK MIDSTREAM PARTNERS, LP,

ONEOK PARTNERS, L.P.,

ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP,

and

MAGELLAN MIDSTREAM PARTNERS, L.P.,

as Guarantors, and

COMPUTERSHARE TRUST COMPANY, N.A.,

as Trustee

SECOND SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

Indenture dated as of August 31, 2022

6.500% Senior Notes due 2030

Table of Contents

		Page

Section 1	Capitalized Terms.	3

Section 2	Assumption; Succession; Confirmation of Guarantee.	3

Section 3	Guarantee.	3

Section 4	Ratification and Effect.	3

Section 5	Governing Law.	3

Section 6	The Trustee.	3

Section 7	Conflicts.	4

Section 8	Miscellaneous.	4

Section 9	Counterparts.	4

THIS SECOND SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Second Supplemental Indenture”), is among ONEOK, Inc., an Oklahoma corporation (the “New Issuer”), Elk Merger Sub II, L.L.C., a Delaware limited liability company and the predecessor issuer (“Merger Sub II”), EnLink Midstream Partners, LP, a Delaware limited partnership (the “Existing Guarantor”), ONEOK Partners, L.P., a Delaware limited partnership (“ONEOK Partners”), ONEOK Partners Intermediate Limited Partnership, a Delaware limited partnership (“ONEOK ILP”), Magellan Midstream Partners, L.P., a Delaware limited partnership (“Magellan” and, together with Merger Sub II, ONEOK Partners and ONEOK ILP, the “New Guarantors” and, each, a “New Guarantor” and, together with the Existing Guarantor, the “Guarantors”), and Computershare Trust Company, N.A., as trustee under the Indenture referred to below (the “Trustee”).

RECITALS

WHEREAS, EnLink Midstream, LLC, a Delaware limited liability company (the “Original Issuer”), the Existing Guarantor, and the Trustee have entered into that certain Indenture, dated as of August 31, 2022 (the “Base Indenture”), pursuant to which the Original Issuer has issued its 6.500% Senior Notes due 2030 (the “Notes”), as amended and supplemented by the First Supplemental Indenture, dated as of January 31, 2025, among Merger Sub II, as successor to the Original Issuer, the Existing Guarantor, and the Trustee (the “First Supplemental Indenture” and, together with the Base Indenture and this Second Supplemental Indenture, the “Indenture”), pursuant to which Merger Sub II assumed and succeeded to the obligations of the Original Issuer under the Indenture and the Notes pursuant to Article X of the Base Indenture;

WHEREAS, in connection with the Distribution, the Existing Guarantor desires to confirm that its Guarantee shall continue to apply to the obligations under the Notes and the Indenture;

WHEREAS, in connection with the Distribution, the New Guarantors, each a Subsidiary of the New Issuer, desire to unconditionally guarantee all of the New Issuer’s obligations under each series of Notes in accordance with Article XIV of the Base Indenture (each, a “Note Guarantee”);

WHEREAS, (i) in accordance with Section 10.01 of the Base Indenture, (A) the New Issuer is delivering this Second Supplemental Indenture to expressly assume all the obligations of Merger Sub II under the Indenture and the Notes, and (B) the Existing Guarantor is delivering this Second Supplemental Indenture to expressly confirm that its Guarantee shall continue to apply to the obligations under the Notes and the Indenture; and (ii) in accordance with Section 9.01(a) of the Base Indenture, the New Guarantors are delivering this Second Supplemental Indenture to become Subsidiary Guarantors with respect to, and provide Guarantees of, the Notes;

WHEREAS, the New Issuer, has delivered or is delivering to the Trustee an Officers’ Certificate and an Opinion of Counsel required by Sections 9.03, 10.01(d) and 13.05 of the Base Indenture; and

Section 1 Capitalized Terms.

Any capitalized term used and not otherwise defined herein shall have the meaning assigned to such term in the Indenture.

Section 2 Assumption; Succession; Confirmation of Guarantee.

Section 3 Guarantee.

Section 4 Ratification and Effect.

Section 5 Governing Law.

Section 6 The Trustee.

Section 7 Conflicts.

Section 8 Miscellaneous.

Section 9 Counterparts.

Signature page follows.

IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental Indenture to be duly executed as of the date first written above.

	ISSUER:

	ONEOK, INC.

	By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

	GUARANTORS:

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

[Signature Page to Second Supplemental Indenture (ENLC 2022 Indenture)]

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

[Signature Page to Second Supplemental Indenture (ENLC 2022 Indenture)]

	TRUSTEE:

	COMPUTERSHARE TRUST COMPANY, N.A.,
	as Trustee

	By:	/s/ Corey J. Dahlstrand
	Name:	Corey J. Dahlstrand
	Title:	Vice President

[Signature Page to Second Supplemental Indenture (ENLC 2022 Indenture)]

Exhibit 4.8

ONEOK, INC.,

as Issuer,

ELK MERGER SUB II, L.L.C.,

ENLINK MIDSTREAM PARTNERS, LP,

ONEOK Partners, L.P.,

ONEOK Partners Intermediate Limited Partnership,

and

Magellan Midstream Partners, L.P.,

as Guarantors, and

COMPUTERSHARE TRUST COMPANY, N.A.,

as Trustee

THIRD SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

Indenture dated as of August 15, 2024

5.650% Senior Notes due 2034

Table of Contents

		Page

Section 1	Capitalized Terms.	3

Section 2	Assumption; Succession; Confirmation of Guarantee.	3

Section 3	Guarantee.	3

Section 4	Ratification and Effect.	3

Section 5	Governing Law.	3

Section 6	The Trustee.	3

Section 7	Conflicts.	4

Section 8	Miscellaneous.	4

Section 9	Counterparts.	4

THIS THIRD SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Third Supplemental Indenture”), is among ONEOK, Inc., an Oklahoma corporation (the “New Issuer”), Elk Merger Sub II, L.L.C., a Delaware limited liability company and the predecessor issuer (“Merger Sub II”), EnLink Midstream Partners, LP, a Delaware limited partnership (the “Existing Guarantor”), ONEOK Partners, L.P., a Delaware limited partnership (“ONEOK Partners”), ONEOK Partners Intermediate Limited Partnership, a Delaware limited partnership (“ONEOK ILP”), Magellan Midstream Partners, L.P., a Delaware limited partnership (“Magellan” and, collectively with Merger Sub II, ONEOK Partners and ONEOK ILP, the “New Guarantors” and, each, a “New Guarantor” and, together with the Existing Guarantor, the “Guarantors”), and Computershare Trust Company, N.A., as trustee under the Indenture referred to below (the “Trustee”).

RECITALS

WHEREAS, EnLink Midstream, LLC, a Delaware limited liability company (the “Original Issuer”), the Existing Guarantor, and the Trustee have entered into that certain Indenture, dated as of August 15, 2024 (the “Base Indenture”), as amended and supplemented by the First Supplemental Indenture, dated as of August 15, 2024, among the Original Issuer, the Existing Guarantor, and the Trustee (the “First Supplemental Indenture”), pursuant to which the Original Issuer has issued its 5.650% Senior Notes due 2034 (the “Debt Securities”), as amended and supplemented by the Second Supplemental Indenture, dated as of January 31, 2025, among Merger Sub II, as successor to the Original Issuer, the Existing Guarantor, and the Trustee (the “Second Supplemental Indenture” and, together with the Base Indenture, the First Supplemental Indenture, and this Third Supplemental Indenture, the “Indenture”), pursuant to which Merger Sub II assumed and succeeded to the obligations of the Original Issuer under the Indenture and the Debt Securities pursuant to Article X of the Base Indenture;

WHEREAS, in connection with the Distribution, the Existing Guarantor desires to confirm that its Guarantee shall continue to apply to the obligations under the Debt Securities and the Indenture;

WHEREAS, the New Issuer, has delivered or is delivering to the Trustee an Officers’ Certificate and an Opinion of Counsel required by Sections 9.03, 10.01(d) and 13.05 of the Base Indenture; and

Section 1 Capitalized Terms.

Any capitalized term used and not otherwise defined herein shall have the meaning assigned to such term in the Indenture.

Section 2 Assumption; Succession; Confirmation of Guarantee.

Section 3 Guarantee.

Section 4 Ratification and Effect.

Section 5 Governing Law.

Section 6 The Trustee.

Section 7 Conflicts.

Section 8 Miscellaneous.

Section 9 Counterparts.

Signature page follows.

IN WITNESS WHEREOF, the parties hereto have caused this Third Supplemental Indenture to be duly executed as of the date first written above.

	ISSUER:

	ONEOK, INC.

	By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

	GUARANTORS:

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

[Signature Page to ENLC Third Supplemental Indenture (2024 Indenture)]

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

[Signature Page to ENLC Third Supplemental Indenture (2024 Indenture)]

	TRUSTEE:

	COMPUTERSHARE TRUST COMPANY, N.A., as Trustee

	By:	/s/ Corey J. Dahlstrand
	Name:	Corey J. Dahlstrand
	Title:	Vice President

[Signature Page to ENLC Third Supplemental Indenture (2024 Indenture)]

Exhibit 4.9

ONEOK, INC.,

as Issuer,

ENLINK MIDSTREAM PARTNERS, LP,

ELK MERGER SUB II, L.L.C.,

ONEOK PARTNERS, L.P.,

ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP,

and

MAGELLAN MIDSTREAM PARTNERS, L.P.,

as Guarantors, and

COMPUTERSHARE TRUST COMPANY, N.A.,

as Trustee

SIXTH SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

Indenture dated as of March 19, 2014

4.150% Senior Notes due 2025

4.850% Senior Notes due 2026

5.600% Senior Notes due 2044

5.050% Senior Notes due 2045

5.450% Senior Notes due 2047

Table of Contents

		Page

Section 1	Capitalized Terms.	3

Section 2	Assumption; Succession.	3

Section 3	Guarantee.	3

Section 4	Ratification and Effect.	3

Section 5	Governing Law.	3

Section 6	The Trustee.	3

Section 7	Conflicts.	4

Section 8	Miscellaneous.	4

Section 9	Counterparts.	4

THIS SIXTH SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Sixth Supplemental Indenture”), is among ONEOK, Inc., an Oklahoma corporation (the “New Issuer”), EnLink Midstream Partners, LP, a Delaware limited partnership and the predecessor issuer (the “Original Issuer”), Elk Merger Sub II, L.L.C., a Delaware limited liability company (“Merger Sub II”), ONEOK Partners, L.P., a Delaware limited partnership (“ONEOK Partners”), ONEOK Partners Intermediate Limited Partnership, a Delaware limited partnership (“ONEOK ILP”), Magellan Midstream Partners, L.P., a Delaware limited partnership (“Magellan” and collectively with the Original Issuer, Merger Sub II, ONEOK Partners, and ONEOK ILP, the “New Guarantors” and, each a “New Guarantor”), and Computershare Trust Company, N.A. (as successor in interest to Wells Fargo Bank, National Association), as trustee under the Indenture referred to below (the “Trustee”).

RECITALS

WHEREAS, the Original Issuer and the Trustee have entered into that certain Indenture, dated as of March 19, 2014 (the “Base Indenture”), as amended and supplemented by the First Supplemental Indenture, dated as of March 19, 2014 (the “First Supplemental Indenture”), pursuant to which the Original Issuer has issued its 5.600% Senior Notes due 2044 (the “2044 Notes”), as amended and supplemented by the Second Supplemental Indenture, dated as of November 12, 2014 (the “Second Supplemental Indenture”), pursuant to which the Original Issuer has issued its 5.050% Senior Notes due 2045 (the “2045 Notes”), as amended and supplemented by the Third Supplemental Indenture, dated as of May 12, 2015 (the “Third Supplemental Indenture”), pursuant to which the Original Issuer has issued its 4.150% Senior Notes due 2025 (the “2025 Notes”), as amended and supplemented by the Fourth Supplemental Indenture, dated as of July 14, 2016 (the “Fourth Supplemental Indenture”), pursuant to which the Original Issuer has issued its 4.850% Senior Notes due 2026 (the “2026 Notes”), as amended and supplemented by the Fifth Supplemental Indenture, dated as of May 11, 2017 (the “Fifth Supplemental Indenture”, and, together with the Base Indenture, the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture and this Sixth Supplemental Indenture, the “Indenture”), pursuant to which the Original Issuer has issued its 5.450% Senior Notes due 2047 (the “2047 Notes” and, together with the 2044 Notes, the 2045 Notes, the 2025 Notes, and the 2026 Notes, the “Notes”);

WHEREAS, in accordance with the terms and conditions of the Agreement and Plan of Merger, dated as of November 24, 2024, by and among the New Issuer, Elk Merger Sub I, L.L.C., a Delaware limited liability company and a direct, wholly-owned subsidiary of the New Issuer (“Merger Sub I”), Merger Sub II, EnLink Midstream, LLC, a Delaware limited liability company (“EnLink”), and EnLink Midstream Manager, LLC, a Delaware limited liability company and the managing member of EnLink, on the date hereof, (i) Merger Sub I merged with and into EnLink (the “First Merger”), with EnLink surviving the First Merger and (ii) promptly following the First Merger and as part of the same overall transaction as the First Merger, at the effective time of the Second Merger (as defined below), EnLink, as the surviving entity in the First Merger, merged with and into Merger Sub II (the “Second Merger” and, together with the First Merger, the “Mergers”), with Merger Sub II surviving the Second Merger as a direct, wholly-owned subsidiary of the New Issuer;

WHEREAS, on the date hereof and promptly following the Mergers, Merger Sub II and the Original Issuer became guarantors of, and provided a guarantee for certain of the outstanding notes of the New Issuer and ONEOK Partners;

WHEREAS, on the date hereof and promptly following the Mergers, pursuant to the Distribution Agreement, dated as of January 31, 2025, by and among the Original Issuer, EnLink Midstream GP, LLC, a Delaware limited liability company and the general partner of the Original Issuer, Merger Sub II and the New Issuer, substantially all of the assets of the Original Issuer were distributed to the New Issuer in a series of related transactions (collectively, the “Distribution”);

WHEREAS, in connection with the Distribution, the New Issuer desires to assume and succeed to the obligations of the Original Issuer under the Indenture and the Notes pursuant to Article X of the Base Indenture;

WHEREAS, in connection with the Distribution, the New Guarantors, each a Subsidiary of the New Issuer, desire to unconditionally guarantee all of the New Issuer’s obligations under each series of Notes in accordance with Article XIV of the Base Indenture (each, a “Note Guarantee”);

WHEREAS, in accordance with Section 9.01(a) of the Base Indenture, the Base Indenture may be supplemented without the consent of the Holders of any of the Notes (which shall conform to the provisions of the Trust Indenture Act of 1939, as amended (the “TIA”) as in force at the date of the execution thereof) to provide for, among other things, (i) the assumption by a Successor Partnership of the covenants, agreements, and obligations of the Original Issuer under the Indenture and the Notes, pursuant to Article X of the Base Indenture, and (ii) the addition of Subsidiary Guarantors with respect to any or all of the Notes;

WHEREAS, Section 10.02 of the Base Indenture provides that in the case of any transaction in accordance with Section 10.01 of the Base Indenture, and upon such assumption by the successor entity, by supplemental indenture, the New Issuer shall succeed to and be substituted for the Original Issuer with the same effect as if the New Issuer had been named the “Partnership” in the Indenture;

WHEREAS, (i) in accordance with Section 10.01 of the Base Indenture, the New Issuer is delivering this Sixth Supplemental Indenture to expressly assume all the obligations of the Original Issuer under the Indenture and the Notes and (ii) in accordance with Section 9.01(a) of the Base Indenture, the New Guarantors are delivering this Sixth Supplemental Indenture to become Subsidiary Guarantors with respect to, and provide Guarantees of, the Notes;

WHEREAS, the New Issuer, has delivered or is delivering to the Trustee an Officers’ Certificate and an Opinion of Counsel required by Sections 9.03, 10.01(2)(d) and 13.05 of the Base Indenture; and

WHEREAS, all requirements necessary to make this Sixth Supplemental Indenture a valid, binding and enforceable instrument in accordance with its terms have been done and performed, and the execution and delivery of this Sixth Supplemental Indenture has been duly authorized in all respects.

NOW, THEREFORE, in consideration of the premises hereof, the parties have executed and delivered this Sixth Supplemental Indenture, and the New Issuer, the New Guarantors and the Trustee agree for the benefit of each other and for the equal and ratable benefit of the Holders of the Notes, as follows:

Section 1 Capitalized Terms.

Any capitalized term used and not otherwise defined herein shall have the meaning assigned to such term in the Indenture.

Section 2 Assumption; Succession.

The New Issuer hereby expressly assumes all the obligations of the Original Issuer under the Indenture and the Notes, as if the New Issuer had been named in the Indenture as the “Partnership”.

Section 3 Guarantee.

Section 4 Ratification and Effect.

Except as expressly amended by this Sixth Supplemental Indenture, the Indenture is in all respects ratified and confirmed and all of the terms, provisions, and conditions thereof shall be and remain in full force and effect. Upon and after execution and delivery of this Sixth Supplemental Indenture, the Indenture shall be supplemented in accordance herewith, this Sixth Supplemental Indenture shall form a part of the Indenture for all purposes, each reference in the Indenture and the Notes to the Indenture shall mean and be a reference to the Indenture as amended hereby, and each reference in the Indenture and the Notes to Elk Merger Sub II, L.L.C. or the Partnership shall mean and be a reference to ONEOK, Inc., as the Successor Partnership.

Section 5 Governing Law.

THIS SIXTH SUPPLEMENTAL INDENTURE FOR ALL PURPOSES SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS ENTERED INTO AND TO BE PERFORMED IN SUCH STATE.

Section 6 The Trustee.

The recitals in this Sixth Supplemental Indenture shall be taken as the statements of the New Issuer and the New Guarantors, and the Trustee assumes no responsibility for their correctness. The Trustee shall not be responsible or accountable in any manner whatsoever for or with respect to the validity or sufficiency of this Sixth Supplemental Indenture. The Trustee shall be under no duty whatsoever to make any determination whether any execution, modification, amendment, supplement, or confirmation to any document is necessary to implement the provisions of this Sixth Supplemental Indenture, and shall be entitled to conclusively rely on the documentation required to be provided under the terms of the Indenture in a form reasonably satisfactory to the Trustee. All of the provisions contained in the Indenture in respect of the rights, privileges, immunities, powers, and duties of the Trustee shall be applicable in respect of this Sixth Supplemental Indenture as fully and with like force and effect as though fully set forth in full herein.

Section 7 Conflicts.

To the extent of any inconsistency between the terms of the Indenture or the Notes and this Sixth Supplemental Indenture, the terms of this Sixth Supplemental Indenture will control. If and to the extent any provision of this Sixth Supplemental Indenture limits, qualifies, or conflicts with any other provision of this Sixth Supplemental Indenture that is required to be included in this Sixth Supplemental Indenture or is deemed applicable to the Indenture by virtue of the provisions of the TIA, such required provision shall control.

Section 8 Miscellaneous.

This Sixth Supplemental Indenture, the Fifth Supplemental Indenture, the Fourth Supplemental Indenture , the Third Supplemental Indenture, the Second Supplemental Indenture and the First Supplemental Indenture constitute the entire agreement of the parties hereto with respect to the amendments to the Base Indenture set forth in each such supplement. All covenants and agreements in this Sixth Supplemental Indenture given by the parties hereto shall bind their successors. In case any provision in this Sixth Supplemental Indenture shall be invalid, illegal, or unenforceable, the validity, legality and enforceability of the remaining provisions hereof or of the Indenture shall not in any way be affected or impaired thereby. The section headings are for convenience only and shall not affect the construction hereof.

Section 9 Counterparts.

This Sixth Supplemental Indenture shall be valid, binding, and enforceable against a party only when executed and delivered by an authorized individual on behalf of the party by means of (i) any electronic signature permitted by the federal Electronic Signatures in Global and National Commerce Act, state enactments of the Uniform Electronic Transactions Act, and/or any other relevant electronic signatures law, including relevant provisions of the Uniform Commercial Code/UCC (collectively, “Signature Law”); (ii) an original manual signature; or (iii) a faxed, scanned, or photocopied manual signature. Each electronic signature or faxed, scanned, or photocopied manual signature shall for all purposes have the same validity, legal effect, and admissibility in evidence as an original manual signature. Each party hereto shall be entitled to conclusively rely upon, and shall have no liability with respect to, any faxed, scanned, or photocopied manual signature, or other electronic signature, of any party and shall have no duty to investigate, confirm or otherwise verify the validity or authenticity thereof. This Sixth Supplemental Indenture may be executed in any number of counterparts, each of which shall be deemed to be an original, but such counterparts shall, together, constitute one and the same instrument. For avoidance of doubt, original manual signatures shall be used for execution or endorsement of writings when required under the UCC or other Signature Law due to the character or intended character of the writings.

Signature page follows.

IN WITNESS WHEREOF, the parties hereto have caused this Sixth Supplemental Indenture to be duly executed as of the date first written above.

	ISSUER:

	ONEOK, INC.

	By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

	GUARANTORS:

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

[Signature Page to ENLK Sixth Supplemental Indenture (2014 Indenture)]

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

[Signature Page to ENLK Sixth Supplemental Indenture (2014 Indenture)]

	TRUSTEE:

	COMPUTERSHARE TRUST COMPANY, N.A.,
	as Trustee

	By:	/s/ Corey J. Dahlstrand
	Name:	Corey J. Dahlstrand
	Title:	Vice President

[Signature Page to ENLK Sixth Supplemental Indenture (2014 Indenture)]

Exhibit 4.10

ONEOK, INC.

as Issuer;

ONEOK PARTNERS, L.P.,

ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP,

MAGELLAN MIDSTREAM PARTNERS, L.P.,

ENLINK MIDSTREAM PARTNERS, LP,

and

ELK MERGER SUB II, L.L.C.

as Guarantors;

and

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

as Trustee

SEVENTH SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

to

INDENTURE

Relating to Debt Securities

Dated as of September 24, 1998

6-7/8% Debentures due 2028

SEVENTH SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Supplemental Indenture”), among ONEOK, INC., an Oklahoma corporation (the “Company”), ONEOK PARTNERS, L.P., a Delaware limited partnership (the “Partnership”), ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP, a Delaware limited partnership (the “Intermediate Partnership”), MAGELLAN MIDSTREAM PARTNERS, L.P., a Delaware limited partnership (together with the Partnership and the Intermediate Partnership, the “Existing Guarantors”), EnLink Midstream Partners, LP, a Delaware limited partnership (“ENLK”), Elk Merger Sub II, L.L.C., a Delaware limited liability company and direct, wholly-owned subsidiary of the Company (“Merger Sub II”) (each of ENLK and Merger Sub II, a “New Guarantor” and, collectively, the “New Guarantors” and, together with the Existing Guarantors, the “Guarantors”), and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as successor trustee to Chase Bank of Texas, National Association under the Indenture referred to below (in such capacity, the “Trustee”).

RECITALS

WHEREAS, the Company and the Trustee have heretofore entered into an Indenture, dated as of September 24, 1998 (the “Original Indenture”) (the Original Indenture, as amended and supplemented from time to time, including without limitation pursuant to this Supplemental Indenture, being referred to herein as the “Indenture”);

WHEREAS, on the date hereof, pursuant to an Agreement and Plan of Merger, dated as of November 24, 2024 (the “Merger Agreement”), among the Company, Elk Merger Sub I, L.L.C., a Delaware limited liability company and direct, wholly-owned subsidiary of the Company (“Merger Sub I”), Merger Sub II, EnLink Midstream, LLC, a Delaware limited liability company (“EnLink”), and EnLink Midstream Manager, LLC, a Delaware limited liability company and managing member of EnLink, (i) Merger Sub I merged with and into EnLink (the “First Merger”), with EnLink as the surviving company, and (ii) promptly following the First Merger, EnLink, as the surviving entity in the First Merger, merged with and into Merger Sub II (the “Second Merger”), with Merger Sub II surviving the Second Merger as a direct, wholly-owned subsidiary of the Company;

WHEREAS, Section 901 of the Indenture provides that the Company and the Trustee may from time to time and at any time, without the consent of Holders, enter into a supplemental indenture to make any change that does not adversely affect the rights of any Holder;

WHEREAS, the changes made herein do not adversely affect the rights of any Holder;

WHEREAS, all acts and requirements necessary to make this Supplemental Indenture a legal, valid and binding obligation of the Company and the Guarantors have been done; and

WHEREAS, in connection with the transactions contemplated by the Merger Agreement, the New Guarantors desire to become guarantors of, and provide guarantees of, the currently outstanding securities, the titles of the series and the current outstanding principal amounts thereof being set forth on Schedule A hereto (collectively, the “Currently Outstanding Securities”).

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, each of the New Guarantors hereby guarantees the Company’s obligations under the Currently Outstanding Securities as follows:

Article I
RELATION TO INDENTURE; DEFINITIONS AND OTHER PROVISIONS OF

GENERAL APPLICATION

Section 1.01 Relation to Indenture. With respect to the Currently Outstanding Securities, this Supplemental Indenture constitutes an integral part of the Original Indenture.

Section 1.02 Definitions. For all purposes of this Supplemental Indenture, capitalized terms used herein and not otherwise defined herein shall have the meanings assigned thereto in the Original Indenture.

Section 1.03 General References. All references in this Supplemental Indenture to Articles and Sections, unless otherwise specified, refer to the corresponding Articles and Sections of this Supplemental Indenture; and the term “herein”, “hereof”, “hereunder” and any other word of similar import refers to this Supplemental Indenture.

Article II
AGREEMENT TO GUARANTEE

Section 2.01 Unconditional Guarantee.

(a) For value received, subject to Section 2.04 hereof, each of the New Guarantors hereby fully, irrevocably, unconditionally and absolutely guarantees to the Holders of each series of Currently Outstanding Securities and to the Trustee the due and punctual payment of the principal of, and premium, if any, and interest on such Currently Outstanding Securities, and all other amounts due and payable under the Indenture and such Currently Outstanding Securities by the Company to the Trustee or such Holders (including, without limitation, all costs and expenses (including reasonable legal fees and disbursements) incurred by the Trustee or such Holders in connection with the enforcement of the Indenture and the Guarantees) (collectively, the “Indenture Obligations”), when and as such amounts shall become due and payable, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, according to the terms of such Currently Outstanding Securities and the Indenture. The guarantees by the New Guarantors set forth in this ARTICLE II are referred to herein as the “EnLink Guarantees.” Without limiting the generality of the foregoing, each New Guarantor’s liability shall extend to all amounts that constitute part of the Indenture Obligations and would be owed by the Company to the Trustee or such Holders under the Indenture and such Currently Outstanding Securities but for the fact that they are unenforceable, reduced, limited, impaired, suspended or not allowable due to the existence of a bankruptcy, reorganization or similar proceeding involving the Company.

(b) Failing payment when due of any amount guaranteed pursuant to the EnLink Guarantees, for whatever reason, each of the New Guarantors will be obligated (to the fullest extent permitted by applicable law) to pay the same immediately to the Trustee, without set-off or counterclaim or other reduction whatsoever (whether for taxes, withholding or otherwise). The EnLink Guarantees hereunder are intended to be general, unsecured, senior obligations of the New Guarantors and will rank pari passu in right of payment with all unsecured indebtedness of the New Guarantors that is not, by its terms, expressly subordinated in right of payment to the EnLink Guarantees of the New Guarantors. Each of the New Guarantors hereby agree that, to the fullest extent permitted by applicable law, subject to Section 2.04 hereof, their obligations hereunder shall be full, irrevocable, unconditional and absolute, irrespective of the validity, regularity or enforceability of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, the absence of any action to enforce the same, any waiver or consent by any such Holder with respect to any provisions hereof or thereof, the recovery of any judgment against the Company, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or defense of the New Guarantors. Each of the New Guarantors hereby agrees that in the event of a default in payment of any Indenture Obligations, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, legal proceedings may be instituted by the Trustee on behalf of such Holders or, subject to Section 507 of the Indenture, by such Holders, on the terms and conditions set forth in the Indenture, directly against the New Guarantors to enforce the EnLink Guarantees without first proceeding against the Company.

(c) To the fullest extent permitted by applicable law, subject to Section 2.04 hereof, the obligations of the New Guarantors under this ARTICLE II shall be as aforesaid full, irrevocable, unconditional and absolute and shall not be impaired, modified, discharged, released or limited by any occurrence or condition whatsoever, including, without limitation, (i) any compromise, settlement, release, waiver, renewal, extension, indulgence or modification of, or any change in, any of the obligations and liabilities of the Company or any New Guarantor contained in any of such Currently Outstanding Securities or the Indenture, (ii) any impairment, modification, release or limitation of the liability of the Company, any New Guarantor or any of their estates in bankruptcy, or any remedy for the enforcement thereof, resulting from the operation of any present or future provision of any applicable Bankruptcy Law, as amended, or other statute or from the decision of any court, (iii) the assertion or exercise by the Trustee or any such Holder of any rights or remedies under any of such Currently Outstanding Securities or the Indenture or their delay in or failure to assert or exercise any such rights or remedies, (iv) the assignment or the purported assignment of any property as security for any of such Currently Outstanding Securities, including all or any part of the rights of the Company or any New Guarantor under the Indenture, (v) the extension of the time for payment by the Company or any New Guarantor of any payments or other sums or any part thereof owing or payable under any of the terms and provisions of any of such Currently Outstanding Securities or the Indenture or of the time for performance by the Company or any New Guarantor of any other obligations under or arising out of any such terms and provisions or the extension or the renewal of any thereof, (vi) the modification or amendment (whether material or otherwise) of any duty, agreement or obligation of the Company or any New Guarantor set forth in the Indenture, (vii) the voluntary or involuntary liquidation, dissolution, sale or other disposition of all or substantially all of the assets, marshaling of assets and liabilities, receivership, insolvency, bankruptcy, assignment for the benefit of creditors, reorganization, arrangement, composition or readjustment, rehabilitation or relief of, or other similar proceeding affecting, the Company or any New Guarantor or any of their respective assets, or the disaffirmance of any of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture in any such proceeding, (viii) the release or discharge of the Company or any New Guarantor from the performance or observance of any agreement, covenant, term or condition contained in any of such instruments by operation of law, (ix) the unenforceability of any of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, (x) any change in the name, business, capital structure, corporate existence, or ownership of the Company or any New Guarantor, or (xi) any other circumstance which might otherwise constitute a defense available to, or a legal or equitable discharge of, a surety or any New Guarantor.

(d) To the fullest extent permitted by applicable law, each of the New Guarantors hereby (i) waives diligence, presentment, demand of payment, notice of acceptance, filing of claims with a court in the event of the merger, insolvency or bankruptcy of the Company or any Guarantor, and all demands and notices whatsoever, (ii) acknowledges that any agreement, instrument or document evidencing the EnLink Guarantees may be transferred and that the benefit of its obligations hereunder shall extend to each holder of any agreement, instrument or document evidencing the EnLink Guarantees without notice to them and (iii) covenants that the EnLink Guarantees will not be discharged except by complete performance of the EnLink Guarantees. To the fullest extent permitted by applicable law, each of the New Guarantors further agrees that if at any time all or any part of any payment theretofore applied by any Person to the EnLink Guarantees is, or must be, rescinded or returned for any reason whatsoever, including without limitation, the insolvency, bankruptcy or reorganization of the New Guarantors, the EnLink Guarantees shall, to the extent that such payment is or must be rescinded or returned, be deemed to have continued in existence notwithstanding such application, and the EnLink Guarantees shall continue to be effective or be reinstated, as the case may be, as though such application had not been made.

(e) Each of the New Guarantors shall be subrogated to all rights of the Holders and the Trustee against the Company in respect of any amounts paid by the New Guarantors pursuant to the provisions of the Indenture; provided, however, that each of the New Guarantors shall not be entitled to enforce or to receive any payments arising out of, or based upon, such right of subrogation with respect to any of such Currently Outstanding Securities until all of such Currently Outstanding Securities and the EnLink Guarantees shall have been indefeasibly paid in full or discharged.

(f) To the fullest extent permitted by applicable law, no failure to exercise and no delay in exercising, on the part of the Trustee or the Holders, any right, power, privilege or remedy under this ARTICLE II and the EnLink Guarantees shall operate as a waiver thereof, nor shall any single or partial exercise of any rights, power, privilege or remedy preclude any other or further exercise thereof, or the exercise of any other rights, powers, privileges or remedies. The rights and remedies herein provided for are cumulative and not exclusive of any rights or remedies provided in law or equity. Nothing contained in this ARTICLE II shall limit the right of the Trustee or the Holders to take any action to accelerate the maturity of such Currently Outstanding Securities pursuant to Article FIVE of the Indenture or to pursue any rights or remedies under the Indenture or under applicable law.

Section 2.02 Limitation on Guarantor Liability. Each of the New Guarantors and the Trustee hereby confirm that it is the intention of all such parties that the EnLink Guarantees of the New Guarantors not constitute fraudulent transfers or conveyances for purposes of Bankruptcy Law, the Uniform Fraudulent Conveyance Act, the Uniform Fraudulent Transfer Act or any similar federal or state law to the extent applicable to the EnLink Guarantees. To effectuate the foregoing intention, the Trustee and the New Guarantors hereby irrevocably agree that the obligations of the New Guarantors will be limited to the maximum amount that will, after giving effect to such maximum amount and all other contingent and fixed liabilities of the New Guarantors that are relevant under such laws, and after giving effect to any collections from, rights to receive contribution from or payments made by or on behalf of the New Guarantors in respect of the obligations of the New Guarantors under this ARTICLE II, result in the obligations of the New Guarantors under the EnLink Guarantees not constituting fraudulent transfers or conveyances.

Section 2.03 No Requirement to Endorse Notation of Guarantee. Each of the New Guarantors hereby agrees that its execution and delivery of this Supplemental Indenture and this ARTICLE II shall evidence the EnLink Guarantees without the need for notation on any Currently Outstanding Securities.

Section 2.04 Release of Guarantee.

(a) Notwithstanding anything to the contrary in this ARTICLE II, if either of the New Guarantors (i) shall cease to be a Subsidiary of the Company or (ii) shall no longer be (x) an obligor on, or issuer of, any capital markets debt securities or (y) a guarantor of any capital markets debt securities issued by the Company or the other Existing Guarantors, in each case other than the Currently Outstanding Securities or any other series of capital market debt securities of the Company outstanding on, and for which the applicable New Guarantor is giving a guarantee, on the date hereof, then if no Default or Event of Default shall have occurred and be continuing, the applicable New Guarantor, upon giving written notice to the Trustee to the foregoing effect, shall be deemed to be released from all of its obligations under the Indenture, and the EnLink Guarantees shall be of no further force or effect with respect to the applicable New Guarantor. Following the receipt by the Trustee of any such notice, the Company shall cause the Indenture to be amended as provided in Section 901 of the Indenture; provided, however, that the failure to so amend the Indenture shall not affect the validity of the termination of the EnLink Guarantees with respect to the applicable New Guarantor.

(b) In addition, upon (i) the exercise of the legal defeasance or covenant defeasance option or the satisfaction and discharge of the Indenture as provided in ARTICLES FOURTEEN and FOUR, respectively, of the Indenture with respect to a series of Currently Outstanding Securities, or (ii) a series of Currently Outstanding Securities ceasing to be Outstanding, each New Guarantor shall be deemed to be released from all its obligations under the Indenture with respect to such series of Currently Outstanding Securities and the EnLink Guarantees of such series of Currently Outstanding Securities shall be of no further force or effect.

Section 2.05 Benefits Acknowledged. Each of the New Guarantors acknowledges that it shall receive direct and indirect benefits from the financing arrangements contemplated by the Indenture and from the EnLink Guarantees under this Supplemental Indenture.

Article III

MISCELLANEOUS

Section 3.01 Notices. Notices to the New Guarantors shall be made in accordance with Section 105 of the Indenture at the address for the Company set forth in such Section.

Section 3.02 No Recourse Against Others. No director, officer, employee, partner (including, for greater certainty, any general partner of any general partnership who is an individual person), incorporator, manager, stockholder or member of either of the Company or any Guarantor, as such, will have any liability for any obligations of the Company, the New Guarantors or the other Existing Guarantors under the Currently Outstanding Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. The waiver and release are part of the consideration for the issuance of the EnLink Guarantees and the Currently Outstanding Securities.

Section 3.03 Certain Trustee Matters.

The recitals contained herein shall be taken as the statements of the Company and the Guarantors, and the Trustee assumes no responsibility for their correctness.

The Trustee makes no representations as to the validity or sufficiency of this Supplemental Indenture or the proper authorization or the due execution hereof or thereof by the Company or the Guarantors.

Except as expressly set forth herein, nothing in this Supplemental Indenture shall alter the duties, rights, privileges, immunities or obligations of the Trustee set forth in the Original Indenture.

Section 3.05 Governing Law. This Supplemental Indenture and the Currently Outstanding Securities shall be governed by and construed in accordance with the laws of the State of New York. This Supplemental Indenture and the Currently Outstanding Securities are subject to the provisions of the Trust Indenture Act that are required to be part of this Supplemental Indenture and the Currently Outstanding Securities and shall, to the extent applicable, be governed by such provisions.

Section 3.06 Counterparts. This instrument may be executed in any number of counterparts, each of which, when delivered, shall be deemed to be an original, but all such counterparts shall together constitute but one and the same instrument. Signatures to this Supplemental Indenture transmitted by electronic mail in “portable document format” (“.pdf”) form, or by any other electronic means intended to preserve the original graphic and pictorial appearance of a document, will have the same effect as physical delivery of the paper document bearing the original signature. The words “execution,” “signed,” “signature,” and words of like import in this Supplemental Indenture shall be deemed to include electronic signatures or electronic records, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature or the use of a paper-based recordkeeping system, as the case may be, to the extent and as provided for in any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act.

(signature page follows)

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and delivered, all as of the day and year first above written.

	ONEOK, INC.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

[Signature Page to ONEOK Seventh Supplemental Indenture]

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

[Signature Page to ONEOK Seventh Supplemental Indenture]

	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,
	as Trustee

	By:	/s/ Jennifer Gillis
	Name:	Jennifer Gillis
	Title:	Vice President

[Signature Page to ONEOK Seventh Supplemental Indenture]

Schedule A
Currently Outstanding Securities

$100,000,000 6-7/8% Debentures due 2028

Exhibit 4.11

FOURTEENTH SUPPLEMENTAL INDENTURE

FOURTEENTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of January 31, 2025, among ONEOK, Inc., an Oklahoma corporation (“ONEOK”), ONEOK Partners, L.P., a Delaware limited partnership (“ONEOK Partners”), ONEOK Partners Intermediate Limited Partnership, a Delaware limited partnership (“Intermediate Partners”), Magellan Midstream Partners, L.P., a Delaware limited partnership (“Magellan” and, together with ONEOK Partners and Intermediate Partners, the “Existing Guarantors”), EnLink Midstream Partners, LP, a Delaware limited partnership (“ENLK”), Elk Merger Sub II, L.L.C., a Delaware limited liability company (“Merger Sub II,” and, together with ENLK, the “New Guarantors” and each, a “New Guarantor”), and U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as trustee under the Indenture referred to below (the “Trustee”). The Existing Guarantors together with the New Guarantors will be referred to collectively herein as the “Guarantors.”

W I T N E S S E T H:

WHEREAS, the applicable Obligor (as defined below) has previously executed and delivered to the Trustee an indenture, dated as of August 11, 2010 (the “Original Indenture”), as supplemented by the Second Supplemental Indenture, dated as of November 9, 2012, as supplemented by the Third Supplemental Indenture, dated as of October 10, 2013, as supplemented by the Fourth Supplemental Indenture, dated as of March 4, 2015, as supplemented by the Fifth Supplemental Indenture, dated as of March 4, 2015, as supplemented by the Sixth Supplemental Indenture, dated as of February 29, 2016, as supplemented by the Seventh Supplemental Indenture, dated as of September 13, 2016, as supplemented by the Eighth Supplemental Indenture, dated as of October 3, 2017, as supplemented by the Ninth Supplemental Indenture, dated as of January 18, 2019, as supplemented by the Tenth Supplemental Indenture, dated as of August 19, 2019, as supplemented by the Eleventh Supplemental Indenture, dated as of May 20, 2020, as supplemented by the Twelfth Supplemental Indenture, dated as of September 25, 2023, and as supplemented by the Thirteenth Supplemental Indenture, dated as of December 13, 2023 (the “Thirteenth Supplemental Indenture”) (such supplemental indentures, collectively with the Original Indenture and this Supplemental Indenture, the “Indenture”), in each case, among such Obligor, the guarantors party thereto and the Trustee, related to ONEOK’s outstanding 3.20% Senior Notes due 2025, ONEOK’s 5.00% Senior Notes due 2026, ONEOK’s 3.250% Senior Notes due 2030, ONEOK’s 4.20% Senior Notes due 2042, ONEOK’s 5.15% Senior Notes due 2043, ONEOK’s 4.20% Senior Notes due 2045, ONEOK’s 4.25% Senior Notes due 2046, ONEOK’s 4.200% Senior Notes due 2047, ONEOK’s 4.850% Senior Notes due 2049 and ONEOK’s 3.950% Senior Notes due 2050;

WHEREAS, pursuant to the Thirteenth Supplemental Indenture, ONEOK assumed Magellan’s obligations as primary obligor with respect to the then outstanding securities issued under the Indenture (Magellan or ONEOK, in such capacity as primary obligor, the “Obligor”);

WHEREAS, on the date hereof, pursuant to an Agreement and Plan of Merger, dated as of November 24, 2024 (the “Merger Agreement”), among ONEOK, Elk Merger Sub I, L.L.C., a Delaware limited liability company (“Merger Sub I”), Merger Sub II, EnLink Midstream, LLC, a Delaware limited liability company (“EnLink”), and EnLink Midstream Manager, LLC, a Delaware limited liability company and managing member of EnLink, (i) Merger Sub I merged with and into EnLink (the “First Merger”), with EnLink as the surviving company and (ii) promptly following the First Merger, EnLink, as the surviving entity in the First Merger, merged with and into Merger Sub II (the “Second Merger”), with Merger Sub II surviving the Second Merger as a direct, wholly-owned subsidiary of ONEOK;

WHEREAS, Section 9.01 of the Original Indenture provides that ONEOK and the Trustee may from time to time and at any time, without the consent of Holders, enter into a supplemental indenture to make any change that does not adversely affect the rights of any Holder;

WHEREAS, all acts and requirements necessary to make this Supplemental Indenture a legal, valid and binding obligation of ONEOK and each of the Guarantors have been done; and

WHEREAS, in connection with the transactions contemplated by the Merger Agreement, each of the New Guarantors desires to become a guarantor of, and provide a guarantee of, the currently outstanding securities, the titles of the series and the current outstanding principal amounts thereof being set forth on Schedule A hereto (collectively, the “Currently Outstanding Securities”).

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, ONEOK, each of the Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the holders of the Notes as follows:

Article I
RELATION TO INDENTURE; DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

Section 1.01 Relation to Indenture. With respect to the Currently Outstanding Securities, this Supplemental Indenture constitutes an integral part of the Indenture.

Section 1.02 Definitions. Capitalized terms used herein without definition shall have the meanings assigned to them in the Original Indenture.

Section 1.03 General References. For all purposes of this Supplemental Indenture, except as otherwise herein expressly provided or unless the context otherwise requires: (a) the terms and expressions used herein shall have the same meanings as corresponding terms and expressions used in the Original Indenture; and (b) the words “herein,” “hereof” and “hereby” and other words of similar import used in this Supplemental Indenture refer to this Supplemental Indenture as a whole and not to any particular section hereof.

Article II
AGREEMENT TO GUARANTEE

Section 2.01 Unconditional Guarantee.

(a) For value received, subject to Section 2.04 hereof, each of the New Guarantors hereby fully, irrevocably, unconditionally and absolutely guarantees to the Holders of each series of Currently Outstanding Securities and to the Trustee the due and punctual payment of the principal of, and premium, if any, and interest on such Currently Outstanding Securities, and all other amounts due and payable under the Indenture and such Currently Outstanding Securities by ONEOK to the Trustee or such Holders (including, without limitation, all costs and expenses (including reasonable legal fees and disbursements of its agents and counsel) incurred by the Trustee or such Holders in connection with the enforcement of the Indenture and the EnLink Guarantees (as defined below) (collectively, the “Indenture Obligations”), when and as such amounts shall become due and payable, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, according to the terms of such Currently Outstanding Securities and the Indenture. The guarantee by each of the New Guarantors set forth in this ARTICLE II is collectively referred to herein as the “EnLink Guarantees,” and each, an “EnLink Guarantee.” Without limiting the generality of the foregoing, each of the New Guarantors’ liability shall extend to all amounts that constitute part of the Indenture Obligations and would be owed by ONEOK to the Trustee or the Holders under the Indenture and such Currently Outstanding Securities but for the fact that they are unenforceable, reduced, limited, impaired, suspended or not allowable due to the existence of a bankruptcy, reorganization or similar proceeding involving ONEOK.

(b) Failing payment when due of any amount guaranteed pursuant to the EnLink Guarantees, for whatever reason, each of the New Guarantors will be obligated (to the fullest extent permitted by applicable law) to pay the same immediately to the Trustee, without set-off or counterclaim or other reduction whatsoever (whether for taxes, withholding or otherwise). Each EnLink Guarantee hereunder is intended to be a general, unsecured, senior obligation of the applicable New Guarantor and will rank pari passu in right of payment with all unsecured indebtedness of each of the New Guarantors that is not, by its terms, expressly subordinated in right of payment to the EnLink Guarantees of the New Guarantors. Each of the New Guarantors hereby agrees that, to the fullest extent permitted by applicable law, subject to Section 2.04 hereof, its obligations hereunder shall be full, irrevocable, unconditional and absolute, irrespective of the validity, regularity or enforceability of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, the absence of any action to enforce the same, any waiver or consent by any such Holder with respect to any provisions hereof or thereof, the recovery of any judgment against ONEOK, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or defense of the New Guarantors. Each of the New Guarantors hereby agrees that in the event of a default in payment of any Indenture Obligations, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, legal proceedings may be instituted by the Trustee on behalf of the Holders or, subject to Section 6.04 of the Original Indenture, by such Holders, on the terms and conditions set forth in the Indenture, directly against such New Guarantors to enforce the EnLink Guarantees without first proceeding against ONEOK.

(c) To the fullest extent permitted by applicable law, subject to Section 2.04 hereof, the obligations of the New Guarantors under this ARTICLE II shall be as aforesaid full, irrevocable, unconditional and absolute and shall not be impaired, modified, discharged, released or limited by any occurrence or condition whatsoever, including, without limitation, (i) any compromise, settlement, release, waiver, renewal, extension, indulgence or modification of, or any change in, any of the obligations and liabilities of ONEOK or the New Guarantors contained in any of such Currently Outstanding Securities or the Indenture, (ii) any impairment, modification, release or limitation of the liability of ONEOK, the New Guarantors or any of their estates in bankruptcy, or any remedy for the enforcement thereof, resulting from the operation of any present or future provision of any applicable Bankruptcy Law, as amended, or other statute or from the decision of any court, (iii) the assertion or exercise by the Trustee or any such Holder of any rights or remedies under any of such Currently Outstanding Securities or the Indenture or their delay in or failure to assert or exercise any such rights or remedies, (iv) the assignment or the purported assignment of any property as security for any of such Currently Outstanding Securities, including all or any part of the rights of ONEOK or the New Guarantors under the Indenture, (v) the extension of the time for payment by ONEOK or the New Guarantors of any payments or other sums or any part thereof owing or payable under any of the terms and provisions of any of such Currently Outstanding Securities or the Indenture or of the time for performance by ONEOK or the New Guarantors of any other obligations under or arising out of any such terms and provisions or the extension or the renewal of any thereof, (vi) the modification or amendment (whether material or otherwise) of any duty, agreement or obligation of ONEOK or the New Guarantors set forth in the Indenture, (vii) the voluntary or involuntary liquidation, dissolution, sale or other disposition of all or substantially all of the assets, marshaling of assets and liabilities, receivership, insolvency, bankruptcy, assignment for the benefit of creditors, reorganization, arrangement, composition or readjustment, rehabilitation or relief of, or other similar proceeding affecting, ONEOK or the New Guarantors or any of their respective assets, or the disaffirmance of any of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture in any such proceeding, (viii) the release or discharge of ONEOK or the New Guarantors from the performance or observance of any agreement, covenant, term or condition contained in any of such instruments by operation of law, (ix) the unenforceability of any of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, (x) any change in the name, business, capital structure, corporate existence, or ownership of ONEOK or the New Guarantors, or (xi) any other circumstance which might otherwise constitute a defense available to, or a legal or equitable discharge of, a surety of the New Guarantors.

(d) To the fullest extent permitted by applicable law, each New Guarantor hereby (i) waives diligence, presentment, demand of payment, notice of acceptance, filing of claims with a court in the event of the merger, insolvency or bankruptcy of ONEOK or such New Guarantor, and all demands and notices whatsoever, (ii) acknowledges that any agreement, instrument or document evidencing its EnLink Guarantee may be transferred and that the benefit of its obligations hereunder shall extend to each holder of any agreement, instrument or document evidencing its EnLink Guarantee without notice to them and (iii) covenants that its EnLink Guarantee will not be discharged except by complete performance of its EnLink Guarantee. To the fullest extent permitted by applicable law, each New Guarantor further agrees that if at any time all or any part of any payment theretofore applied by any Person to its EnLink Guarantee is, or must be, rescinded or returned for any reason whatsoever, including without limitation, the insolvency, bankruptcy or reorganization of such New Guarantor, its EnLink Guarantee shall, to the extent that such payment is or must be rescinded or returned, be deemed to have continued in existence notwithstanding such application, and its EnLink Guarantee shall continue to be effective or be reinstated, as the case may be, as though such application had not been made.

(e) Each New Guarantor shall be subrogated to all rights of the Holders and the Trustee against ONEOK in respect of any amounts paid by such New Guarantor pursuant to the provisions of the Indenture; provided, however, that such New Guarantor shall not be entitled to enforce or to receive any payments arising out of, or based upon, such right of subrogation with respect to any of such Currently Outstanding Securities until all of such Currently Outstanding Securities and its EnLink Guarantee shall have been indefeasibly paid in full or discharged.

(f) To the fullest extent permitted by applicable law, no failure to exercise and no delay in exercising, on the part of the Trustee or the Holders, any right, power, privilege or remedy under this ARTICLE II and the EnLink Guarantees shall operate as a waiver thereof, nor shall any single or partial exercise of any rights, power, privilege or remedy preclude any other or further exercise thereof, or the exercise of any other rights, powers, privileges or remedies. The rights and remedies herein provided for are cumulative and not exclusive of any rights or remedies provided in law or equity. Nothing contained in this ARTICLE II shall limit the right of the Trustee or the Holders to take any action to accelerate the maturity of such Currently Outstanding Securities pursuant to Article VI of the Original Indenture or to pursue any rights or remedies under the Indenture or under applicable law.

Section 2.02 Limitation on Guarantor Liability. The New Guarantors and the Trustee hereby confirm that it is the intention of all such parties that the EnLink Guarantees of the New Guarantors not constitute a fraudulent transfer or conveyance for purposes of Bankruptcy Law, the Uniform Fraudulent Conveyance Act, the Uniform Fraudulent Transfer Act or any similar federal or state law to the extent applicable to the EnLink Guarantees. To effectuate the foregoing intention, the Trustee and the New Guarantors hereby irrevocably agree that the obligations of the New Guarantors will be limited to the maximum amount that will, after giving effect to such maximum amount and all other contingent and fixed liabilities of the New Guarantors that are relevant under such laws, and after giving effect to any collections from, rights to receive contribution from or payments made by or on behalf of the New Guarantors in respect of the obligations of the New Guarantors under this ARTICLE II, result in the obligations of the New Guarantors under the EnLink Guarantees not constituting a fraudulent transfer or conveyance.

Section 2.03 No Requirement to Endorse Notation of Guarantee. Each of the New Guarantors hereby agrees that its execution and delivery of this Supplemental Indenture and the provisions set forth in this ARTICLE II shall evidence its EnLink Guarantee without the need for notation on any Currently Outstanding Securities.

Section 2.04 Release of EnLink Guarantees.

(a) Notwithstanding anything to the contrary in this ARTICLE II, if either of the New Guarantors (i) shall cease to be a Subsidiary of ONEOK or (ii) shall no longer be (x) an obligor on, or issuer of, any capital markets debt securities or (y) a guarantor of any capital markets debt securities issued by ONEOK or the Existing Guarantors, in each case other than the Currently Outstanding Securities or any other series of capital market debt securities of ONEOK outstanding on, and for which such New Guarantor is giving a guarantee, the date hereof, then if no Default or Event of Default shall have occurred and be continuing, such New Guarantor, upon giving written notice to the Trustee to the foregoing effect (which notice the Trustee may rely conclusively upon without investigation), shall be deemed to be released from all of its obligations under the Indenture, and its EnLink Guarantee shall be of no further force or effect with respect to such New Guarantor. Following the receipt by the Trustee of any such notice, ONEOK shall cause the Indenture to be amended and supplemented as provided in Section 9.01 of the Original Indenture; provided, however, that the failure to so amend the Indenture shall not affect the validity of the release and termination of its EnLink Guarantee with respect to such New Guarantor.

(b) In addition, upon (i) the exercise of the legal defeasance or covenant defeasance option or the satisfaction and discharge of the Indenture as provided in ARTICLE XI of the Original Indenture with respect to a series of Currently Outstanding Securities, or (ii) a series of Currently Outstanding Securities ceasing to be Outstanding, the New Guarantors shall be deemed to be released from all their obligations under the Indenture with respect to such series of Currently Outstanding Securities and their EnLink Guarantees of such series of Currently Outstanding Securities shall be of no further force or effect.

Section 2.05 Benefits Acknowledged. Each New Guarantor acknowledges that they shall receive direct and indirect benefits from the financing arrangements contemplated by the Indenture and from the EnLink Guarantees under this Supplemental Indenture.

Article III
MISCELLANEOUS

Section 3.01 Notices. Notices to the New Guarantors shall be made in accordance with Section 13.03 of the Original Indenture. The address for the New Guarantors is 100 West Fifth Street, Tulsa, Oklahoma 74103, or such other address as the New Guarantors may designate from time to time by notice to the Holders and ONEOK. The address for the Corporate Trust Office of the Trustee shall be located at 2 Concourse Parkway, Suite 800, Atlanta, Georgia 30328-5588 Attention: Corporate Trust Department, or such other address as the Trustee may designate from time to time by notice to the Holders and ONEOK.

Section 3.02 No Recourse Against Others. No director, officer, employee, partner (including, for greater certainty, any general partner of any general partnership who is an individual person), incorporator, manager, stockholder or member of ONEOK or any Guarantor, as such, will have any liability for any obligations of ONEOK or the Guarantors under the Currently Outstanding Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. The waiver and release are part of the consideration for the issuance of the EnLink Guarantees and the Currently Outstanding Securities.

Section 3.03 Certain Trustee Matters.

The recitals contained herein shall be taken as the statements of ONEOK and the Guarantors, and the Trustee assumes no responsibility for their correctness.

The Trustee makes no representations as to the validity or sufficiency of this Supplemental Indenture or the proper authorization or the due execution hereof or thereof by ONEOK or any of the Guarantors.

Except as expressly set forth herein, nothing in this Supplemental Indenture shall alter the duties, rights, privileges, immunities or obligations of the Trustee set forth in the Indenture and the Trustee shall be indemnified and held harmless in accordance with the terms thereof as fully and with like effect as if set forth herein in full.

Section 3.04 Continued Effect. Except as expressly supplemented and amended by this Supplemental Indenture, the Indenture shall continue in full force and effect in accordance with the provisions thereof, and the Indenture (as supplemented and amended, including by this Supplemental Indenture) is in all respects hereby ratified and confirmed. This Supplemental Indenture and all its provisions shall be deemed a part of the Indenture in the manner and to the extent herein and therein provided.

(Signature Page Follows)

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of the date first above written.

	ONEOK, INC.

	By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C., its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C., its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

(Signature Page to Fourteenth Supplemental Indenture (2010 Indenture))

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

(Signature Page to Fourteenth Supplemental Indenture (2010 Indenture))

	U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,
	as Trustee

	By:	/s/ Gregory M. Jackson
	Name:	Gregory M. Jackson
	Title:	Vice President

Schedule A
Currently Outstanding Securities

$250,000,000 3.20% Notes due 2025

$650,000,000 5.00% Notes due 2026

$500,000,000 3.25% Notes due 2030

$250,000,000 4.20% Notes due 2042

$550,000,000 5.15% Notes due 2043

$250,000,000 4.20% Notes due 2045

$500,000,000 4.25% Notes due 2046

$500,000,000 4.20% Notes due 2047

$500,000,000 4.85% Notes due 2049

10.

$797,036,000 3.95% Notes due 2050

Exhibit 4.12

FOURTH SUPPLEMENTAL INDENTURE

FOURTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of January 31, 2025, among ONEOK, Inc., an Oklahoma corporation (“ONEOK”), ONEOK Partners, L.P., a Delaware limited partnership (“ONEOK Partners”), ONEOK Partners Intermediate Limited Partnership, a Delaware limited partnership (“Intermediate Partners”), Magellan Midstream Partners, L.P., a Delaware limited partnership (“Magellan” and, together with ONEOK Partners and Intermediate Partners, the “Existing Guarantors”), EnLink Midstream Partners, LP, a Delaware limited partnership (“ENLK”), Elk Merger Sub II, L.L.C., a Delaware limited liability company (“Merger Sub II,” and, together with ENLK, the “New Guarantors” and each, a “New Guarantor”), and U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as trustee under the Indenture referred to below (the “Trustee”). The Existing Guarantors together with the New Guarantors will be referred to collectively herein as the “Guarantors.”

W I T N E S S E T H:

WHEREAS, the applicable Obligor (as defined below) has heretofore executed and delivered to the Trustee an indenture, dated as of April 19, 2007 (the “Original Indenture”), as amended and supplemented by the First Supplemental Indenture, dated as of April 19, 2007 (the “First Supplemental Indenture”), the Second Supplemental Indenture, dated September 25, 2023 (the “Second Supplemental Indenture”), and the Third Supplemental Indenture, dated December 13, 2023 (the “Third Supplemental Indenture” and, together with the First Supplemental Indenture, the Second Supplemental Indenture, this Supplemental Indenture and the Original Indenture, collectively the “Indenture”), in each case, among such Obligor, the guarantors party thereto and the Trustee, related to ONEOK’s outstanding 6.400% Senior Notes due 2037;

WHEREAS, on the date hereof, pursuant to an Agreement and Plan of Merger, dated as of November 24, 2024 (the “Merger Agreement”), among ONEOK, Elk Merger Sub I, L.L.C., a Delaware limited liability company (“Merger Sub I”), Merger Sub II, EnLink Midstream, LLC, a Delaware limited liability company (“EnLink”), and EnLink Midstream Manager, LLC, a Delaware limited liability company and managing member of EnLink, (i) Merger Sub I merged with and into EnLink (the “First Merger”), with EnLink as the surviving company, and (ii) promptly following the First Merger, EnLink, as the surviving entity in the First Merger, merged with and into Merger Sub II (the “Second Merger”), with Merger Sub II surviving the Second Merger as a direct, wholly-owned subsidiary of ONEOK;

WHEREAS, pursuant to the Third Supplemental Indenture, ONEOK assumed Magellan’s obligations as primary obligor with respect to the then outstanding securities issued under the Indenture (Magellan or ONEOK, in such capacity as primary obligor, the “Obligor”);

WHEREAS, all acts and requirements necessary to make this Supplemental Indenture a legal, valid and binding obligation of ONEOK and each of the Guarantors have been done; and

Article I
RELATION TO INDENTURE; DEFINITIONS AND OTHER PROVISIONS OF

GENERAL APPLICATION

Section 1.01 Relation to Indenture. With respect to the Currently Outstanding Securities, this Supplemental Indenture constitutes an integral part of the Indenture.

Section 1.02 Definitions. Capitalized terms used herein without definition shall have the meanings assigned to them in the Original Indenture.

Article II
AGREEMENT TO GUARANTEE

Section 2.01 Unconditional Guarantee.

(a) For value received, subject to Section 2.04 hereof, each of the New Guarantors hereby fully, irrevocably, unconditionally and absolutely guarantees to the Holders of each series of Currently Outstanding Securities and to the Trustee the due and punctual payment of the principal of, and premium, if any, and interest on such Currently Outstanding Securities, and all other amounts due and payable under the Indenture and such Currently Outstanding Securities by ONEOK to the Trustee or such Holders (including, without limitation, all costs and expenses (including reasonable legal fees and disbursements of its agents and counsel) incurred by the Trustee or such Holders in connection with the enforcement of the Indenture and the EnLink Guarantees (as defined below) (collectively, the “Indenture Obligations”), when and as such amounts shall become due and payable, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, according to the terms of such Currently Outstanding Securities and the Indenture. The guarantee by each of the New Guarantors set forth in this ARTICLE II is collectively referred to herein as the “EnLink Guarantees,” and each, an “EnLink Guarantee.” Without limiting the generality of the foregoing, each of the New Guarantors’ liability shall extend to all amounts that constitute part of the Indenture Obligations and would be owed by ONEOK to the Trustee or the Holders under the Indenture and such Currently Outstanding Securities but for the fact that they are unenforceable, reduced, limited, impaired, suspended or not allowable due to the existence of a bankruptcy, reorganization or similar proceeding involving ONEOK.

(b) Failing payment when due of any amount guaranteed pursuant to the EnLink Guarantees, for whatever reason, each of the New Guarantors will be obligated (to the fullest extent permitted by applicable law) to pay the same immediately to the Trustee, without set-off or counterclaim or other reduction whatsoever (whether for taxes, withholding or otherwise). Each EnLink Guarantee hereunder is intended to be a general, unsecured, senior obligation of the applicable New Guarantor and will rank pari passu in right of payment with all unsecured indebtedness of each of the New Guarantors that is not, by its terms, expressly subordinated in right of payment to the EnLink Guarantees of the New Guarantors. Each of the New Guarantors hereby agrees that, to the fullest extent permitted by applicable law, subject to Section 2.04 hereof, its obligations hereunder shall be full, irrevocable, unconditional and absolute, irrespective of the validity, regularity or enforceability of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, the absence of any action to enforce the same, any waiver or consent by any such Holder with respect to any provisions hereof or thereof, the recovery of any judgment against ONEOK, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or defense of the New Guarantors. Each of the New Guarantors hereby agrees that in the event of a default in payment of any Indenture Obligations, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, legal proceedings may be instituted by the Trustee on behalf of the Holders or, subject to Section 6.04 of the Original Indenture, by such Holders, on the terms and conditions set forth in the Indenture, directly against such New Guarantors to enforce the EnLink Guarantees without first proceeding against ONEOK.

(c) To the fullest extent permitted by applicable law, subject to Section 2.04 hereof, the obligations of the New Guarantors under this ARTICLE II shall be as aforesaid full, irrevocable, unconditional and absolute and shall not be impaired, modified, discharged, released or limited by any occurrence or condition whatsoever, including, without limitation, (i) any compromise, settlement, release, waiver, renewal, extension, indulgence or modification of, or any change in, any of the obligations and liabilities of ONEOK or the New Guarantors contained in any of such Currently Outstanding Securities or the Indenture, (ii) any impairment, modification, release or limitation of the liability of ONEOK, the New Guarantors or any of their estates in bankruptcy, or any remedy for the enforcement thereof, resulting from the operation of any present or future provision of any applicable Bankruptcy Law, as amended, or other statute or from the decision of any court, (iii) the assertion or exercise by the Trustee or any such Holder of any rights or remedies under any of such Currently Outstanding Securities or the Indenture or their delay in or failure to assert or exercise any such rights or remedies, (iv) the assignment or the purported assignment of any property as security for any of such Currently Outstanding Securities, including all or any part of the rights of ONEOK or the New Guarantors under the Indenture, (v) the extension of the time for payment by ONEOK or the New Guarantors of any payments or other sums or any part thereof owing or payable under any of the terms and provisions of any of such Currently Outstanding Securities or the Indenture or of the time for performance by ONEOK or the New Guarantors of any other obligations under or arising out of any such terms and provisions or the extension or the renewal of any thereof, (vi) the modification or amendment (whether material or otherwise) of any duty, agreement or obligation of ONEOK or the New Guarantors set forth in the Indenture, (vii) the voluntary or involuntary liquidation, dissolution, sale or other disposition of all or substantially all of the assets, marshaling of assets and liabilities, receivership, insolvency, bankruptcy, assignment for the benefit of creditors, reorganization, arrangement, composition or readjustment, rehabilitation or relief of, or other similar proceeding affecting, ONEOK or the New Guarantors or any of their respective assets, or the disaffirmance of any of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture in any such proceeding, (viii) the release or discharge of ONEOK or the New Guarantors from the performance or observance of any agreement, covenant, term or condition contained in any of such instruments by operation of law, (ix) the unenforceability of any of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, (x) any change in the name, business, capital structure, corporate existence, or ownership of ONEOK or the New Guarantors, or (xi) any other circumstance which might otherwise constitute a defense available to, or a legal or equitable discharge of, a surety of the New Guarantors.

(f) To the fullest extent permitted by applicable law, no failure to exercise and no delay in exercising, on the part of the Trustee or the Holders, any right, power, privilege or remedy under this ARTICLE II and the EnLink Guarantees shall operate as a waiver thereof, nor shall any single or partial exercise of any rights, power, privilege or remedy preclude any other or further exercise thereof, or the exercise of any other rights, powers, privileges or remedies. The rights and remedies herein provided for are cumulative and not exclusive of any rights or remedies provided in law or equity. Nothing contained in this ARTICLE II shall limit the right of the Trustee or the Holders to take any action to accelerate the maturity of such Currently Outstanding Securities pursuant to Article VI of the Original Indenture or to pursue any rights or remedies under the Indenture or under applicable law.

Section 2.04 Release of EnLink Guarantees.

Section 2.05 Benefits AcknowledgedSection 2.06. Each New Guarantor acknowledges that it shall receive direct and indirect benefits from the financing arrangements contemplated by the Indenture and from the EnLink Guarantees under this Supplemental Indenture.

Article III
MISCELLANEOUS

Section 3.02 No Recourse Against Others. No director, officer, employee, partner (including, for greater certainty, any general partner of any general partnership who is an individual person), incorporator, manager, stockholder or member of ONEOK or any Guarantor, as such, will have any liability for any obligations of ONEOK or the Guarantors under the Currently Outstanding Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. The waiver and release are part of the consideration for the issuance of the EnLink Guarantees and the Currently Outstanding Securities.

Section 3.03 Certain Trustee Matters.

The recitals contained herein shall be taken as the statements of ONEOK and the Guarantors, and the Trustee assumes no responsibility for their correctness.

(Signature Page Follows)

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of the date first above written.

	ONEOK, INC.

	By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C., its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C., its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

(Signature Page to Fourth Supplemental Indenture (2007 Indenture))

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

(Signature Page to Fourth Supplemental Indenture (2007 Indenture))

	U.S. BANK TRUST COMPANY, NATIONAL ASSOCATION, As Trustee

	By:	/s/ Gregory M. Jackson
	Name:	Gregory M. Jackson
	Title:	Vice President

(Signature Page to Fourth Supplemental Indenture (2007 Indenture))

Schedule A
Currently Outstanding Securities

1.	$250,000,000 6.40% Notes due 2037

Exhibit 4.13

ONEOK, INC.

as Issuer;

ONEOK PARTNERS, L.P.,

ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP,

MAGELLAN MIDSTREAM PARTNERS, L.P.,

ENLINK MIDSTREAM PARTNERS, LP,

and

ELK MERGER SUB II, L.L.C.

as Guarantors;

and

U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION

as Trustee

SIXTH SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

INDENTURE

Dated as of December 28, 2001

Relating to Debt Securities

6.00% Notes due 2035

SIXTH SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Supplemental Indenture”), among ONEOK, INC., an Oklahoma corporation (the “Company”), ONEOK PARTNERS, L.P., a Delaware limited partnership (the “Partnership”), ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP, a Delaware limited partnership (the “Intermediate Partnership”), MAGELLAN MIDSTREAM PARTNERS, L.P., a Delaware limited partnership (“Magellan” and, together with the Partnership and the Intermediate Partnership, the “Existing Guarantors”), ENLINK MIDSTREAM PARTNERS , LP, a Delaware limited partnership (“ENLK”), ELK MERGER SUB II, L.L.C., a Delaware limited liability company (“Merger Sub II”) (each of ENLK and Merger Sub II, a “New Guarantor” and, collectively, the “New Guarantors” and, together with the Existing Guarantors, the “Guarantors”), and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (as successor in interest to U.S. Bank National Association), as trustee under the Indenture referred to below (in such capacity, the “Trustee”).

RECITALS

WHEREAS, the Company and the Trustee have heretofore entered into an Indenture, dated as of December 28, 2001 (the “Original Indenture”) (the Original Indenture, as amended and supplemented from time to time, including without limitation pursuant to this Supplemental Indenture, collectively being referred to herein as the “Indenture”);

WHEREAS, on the date hereof, pursuant to an Agreement and Plan of Merger, dated as of January 31, 2025 (the “Merger Agreement”), among the Company, Elk Merger Sub I, L.L.C., a Delaware limited liability company (“Merger Sub I”), Merger Sub II, EnLink Midstream, LLC, a Delaware limited liability company (“EnLink”), and EnLink Midstream Manager, LLC, a Delaware limited liability company and managing member of EnLink (the “Manager), (i) Merger Sub I merged with and into EnLink (the “First Merger”), with EnLink as the surviving company, and (ii) promptly following the First Merger, EnLink, as the surviving entity in the First Merger, merged with and into Merger Sub II (the “Second Merger” and, together with the First Merger, the “Mergers”), with Merger Sub II surviving the Second Merger as a direct, wholly-owned subsidiary of the Company;

WHEREAS, all acts and requirements necessary to make this Supplemental Indenture a legal, valid and binding obligation of the Company and the Guarantors have been done; and

Article I
RELATION TO INDENTURE; DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

Section 1.01 Relation to Indenture. With respect to the Currently Outstanding Securities, this Supplemental Indenture constitutes an integral part of the Original Indenture.

Article II
AGREEMENT TO GUARANTEE

Section 2.01 Unconditional Guarantee.

(a) For value received, subject to Section 2.04 hereof, each of the New Guarantors hereby fully, irrevocably, unconditionally and absolutely guarantees to the Holders of each series of Currently Outstanding Securities and to the Trustee the due and punctual payment of the principal of, and premium, if any, and interest on such Currently Outstanding Securities, and all other amounts due and payable under the Indenture and such Currently Outstanding Securities by the Company to the Trustee or such Holders (including, without limitation, all costs and expenses (including reasonable legal fees and disbursements of its agents and counsel) incurred by the Trustee or such Holders in connection with the enforcement of the Indenture and the EnLink Guarantees (as defined below) (collectively, the “Indenture Obligations”), when and as such amounts shall become due and payable, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, according to the terms of such Currently Outstanding Securities and the Indenture. The guarantee by each New Guarantor set forth in this ARTICLE II is referred to herein as the “EnLink Guarantees.” Without limiting the generality of the foregoing, each New Guarantor’s liability shall extend to all amounts that constitute part of the Indenture Obligations and would be owed by the Company to the Trustee or such Holders under the Indenture and such Currently Outstanding Securities but for the fact that they are unenforceable, reduced, limited, impaired, suspended or not allowable due to the existence of a bankruptcy, reorganization or similar proceeding involving the Company.

(b) Failing payment when due of any amount guaranteed pursuant to the EnLink Guarantees, for whatever reason, each of the New Guarantors will be obligated (to the fullest extent permitted by applicable law) to pay the same immediately to the Trustee, without set-off or counterclaim or other reduction whatsoever (whether for taxes, withholding or otherwise). The EnLink Guarantees hereunder are intended to be general, unsecured, senior obligations of the New Guarantors and will rank pari passu in right of payment with all unsecured indebtedness of the New Guarantor that is not, by its terms, expressly subordinated in right of payment to the EnLink Guarantees of the New Guarantors. Each of the New Guarantors hereby agrees that, to the fullest extent permitted by applicable law, subject to Section 2.04 hereof, their obligations hereunder shall be full, irrevocable, unconditional and absolute, irrespective of the validity, regularity or enforceability of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, the absence of any action to enforce the same, any waiver or consent by any such Holder with respect to any provisions hereof or thereof, the recovery of any judgment against the Company, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or defense of the New Guarantors. Each of the New Guarantors hereby agrees that in the event of a default in payment of any Indenture Obligations, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, legal proceedings may be instituted by the Trustee on behalf of the Holders or, subject to Section 507 of the Indenture, by such Holders, on the terms and conditions set forth in the Indenture, directly against the New Guarantors to enforce the EnLink Guarantees without first proceeding against the Company.

(c) To the fullest extent permitted by applicable law, subject to Section 2.04 hereof, the obligations of the New Guarantors under this ARTICLE II shall each be as aforesaid full, irrevocable, unconditional and absolute and shall not be impaired, modified, discharged, released or limited by any occurrence or condition whatsoever, including, without limitation, (i) any compromise, settlement, release, waiver, renewal, extension, indulgence or modification of, or any change in, any of the obligations and liabilities of the Company or the New Guarantors contained in any of such Currently Outstanding Securities or the Indenture, (ii) any impairment, modification, release or limitation of the liability of the Company, the New Guarantors or any of their estates in bankruptcy, or any remedy for the enforcement thereof, resulting from the operation of any present or future provision of any applicable Bankruptcy Law, as amended, or other statute or from the decision of any court, (iii) the assertion or exercise by the Trustee or any such Holder of any rights or remedies under any of such Currently Outstanding Securities or the Indenture or their delay in or failure to assert or exercise any such rights or remedies, (iv) the assignment or the purported assignment of any property as security for any of such Currently Outstanding Securities, including all or any part of the rights of the Company or the New Guarantors under the Indenture, (v) the extension of the time for payment by the Company or the New Guarantors of any payments or other sums or any part thereof owing or payable under any of the terms and provisions of any of such Currently Outstanding Securities or the Indenture or of the time for performance by the Company or the New Guarantors of any other obligations under or arising out of any such terms and provisions or the extension or the renewal of any thereof, (vi) the modification or amendment (whether material or otherwise) of any duty, agreement or obligation of the Company or the New Guarantors set forth in the Indenture, (vii) the voluntary or involuntary liquidation, dissolution, sale or other disposition of all or substantially all of the assets, marshaling of assets and liabilities, receivership, insolvency, bankruptcy, assignment for the benefit of creditors, reorganization, arrangement, composition or readjustment, rehabilitation or relief of, or other similar proceeding affecting, the Company or the New Guarantors or any of their respective assets, or the disaffirmance of any of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture in any such proceeding, (viii) the release or discharge of the Company or the New Guarantors from the performance or observance of any agreement, covenant, term or condition contained in any of such instruments by operation of law, (ix) the unenforceability of any of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, (x) any change in the name, business, capital structure, corporate existence, or ownership of the Company or the New Guarantors, or (xi) any other circumstance which might otherwise constitute a defense available to, or a legal or equitable discharge of, a surety or the New Guarantors.

(d) To the fullest extent permitted by applicable law, each of the New Guarantors hereby (i) waives diligence, presentment, demand of payment, notice of acceptance, filing of claims with a court in the event of the merger, insolvency or bankruptcy of the Company or the New Guarantors, and all demands and notices whatsoever, (ii) acknowledges that any agreement, instrument or document evidencing the EnLink Guarantees may be transferred and that the benefit of its obligations hereunder shall extend to each holder of any agreement, instrument or document evidencing the EnLink Guarantees without notice to them and (iii) covenants that the EnLink Guarantees will not be discharged except by complete performance of the EnLink Guarantees. To the fullest extent permitted by applicable law, each of the New Guarantors further agrees that if at any time all or any part of any payment theretofore applied by any Person to the EnLink Guarantees is, or must be, rescinded or returned for any reason whatsoever, including without limitation, the insolvency, bankruptcy or reorganization of the New Guarantors, the EnLink Guarantees shall, to the extent that such payment is or must be rescinded or returned, be deemed to have continued in existence notwithstanding such application, and the EnLink Guarantees shall continue to be effective or be reinstated, as the case may be, as though such application had not been made.

Section 2.02 Limitation on Guarantor Liability. Each of the New Guarantors and the Trustee hereby confirms that it is the intention of all such parties that the EnLink Guarantees of the New Guarantors not constitute fraudulent transfers or conveyances for purposes of Bankruptcy Law, the Uniform Fraudulent Conveyance Act, the Uniform Fraudulent Transfer Act or any similar federal or state law to the extent applicable to the EnLink Guarantees. To effectuate the foregoing intention, the Trustee and the New Guarantors hereby irrevocably agree that the obligations of the New Guarantors will be limited to the maximum amount that will, after giving effect to such maximum amount and all other contingent and fixed liabilities of the New Guarantors that are relevant under such laws, and after giving effect to any collections from, rights to receive contribution from or payments made by or on behalf of the New Guarantors in respect of the obligations of the New Guarantors under this ARTICLE II, result in the obligations of the New Guarantors under the EnLink Guarantees not constituting fraudulent transfers or conveyances.

Section 2.03 No Requirement to Endorse Notation of Guarantee. Each of the New Guarantors hereby agrees that their execution and delivery of this Supplemental Indenture and the provisions set forth in this ARTICLE II shall evidence the EnLink Guarantees without the need for notation on any Currently Outstanding Securities.

Section 2.04 Release of Guarantee.

(a) Notwithstanding anything to the contrary in this ARTICLE II, if either of the New Guarantors (i) shall cease to be a Subsidiary of the Company or (ii) shall no longer be (x) an obligor on, or issuer of, any capital markets debt securities or (y) a guarantor of any capital markets debt securities issued by the Company or the other Guarantors, in each case other than the Currently Outstanding Securities or any other series of capital market debt securities of the Company outstanding on, and for which the applicable New Guarantor is giving a guarantee, the date hereof, then if no Default or Event of Default shall have occurred and be continuing, the applicable New Guarantor, upon giving written notice to the Trustee to the foregoing effect (which notice the Trustee may rely conclusively upon without investigation), shall be deemed to be released from all of its obligations under the Indenture, and the EnLink Guarantees shall be of no further force or effect with respect to the applicable New Guarantor. Following the receipt by the Trustee of any such notice, the Company shall cause the Indenture to be amended and supplemented as provided in Section 901 of the Indenture; provided, however, that the failure to so amend the Indenture shall not affect the validity of the release and termination of the EnLink Guarantees with respect to the applicable New Guarantor.

(b) In addition, upon (i) the exercise of the legal defeasance or covenant defeasance option or the satisfaction and discharge of the Indenture as provided in ARTICLES FOUR and FIFTEEN , respectively, of the Indenture with respect to a series of Currently Outstanding Securities, or (ii) a series of Currently Outstanding Securities ceasing to be Outstanding, each New Guarantor shall be deemed to be released from all its obligations under the Indenture with respect to such series of Currently Outstanding Securities and the EnLink Guarantees of such series of Currently Outstanding Securities shall be of no further force or effect.

Article III

MISCELLANEOUS

Section 3.01 Notices. Notices to the New Guarantors shall be made in accordance with Section 105 of the Indenture at the address for the Company set forth in such Section. The address for the Corporate Trust Office of the Trustee shall be located at 2 Concourse Parkway, Suite 800, Atlanta, Georgia 30328-5588 Attention: Corporate Trust Department, or such other address as the Trustee may designate from time to time by notice to the Holders and the Company.

Section 3.02 No Recourse Against Others. No director, officer, employee, partner (including, for greater certainty, any general partner of any general partnership who is an individual person), incorporator, manager, stockholder or member of the Company or any Guarantor, as such, will have any liability for any obligations of the Company, the New Guarantors or the other Guarantors under the Currently Outstanding Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. The waiver and release are part of the consideration for the issuance of the EnLink Guarantees and the Currently Outstanding Securities.

Section 3.03 Certain Trustee Matters.

The recitals contained herein shall be taken as the statements of the Company and the Guarantors, and the Trustee assumes no responsibility for their correctness.

Except as expressly set forth herein, nothing in this Supplemental Indenture shall alter the duties, rights, privileges, immunities or obligations of the Trustee set forth in the Original Indenture and the Trustee shall be indemnified and held harmless in accordance with the terms thereof as fully and with like effect as if set forth herein in full.

(signature page follows)

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and delivered, all as of the day and year first above written.

ONEOK, INC.

By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

ONEOK PARTNERS, L.P.

By:	ONEOK Partners GP, L.L.C.,
	its General Partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

By:	ONEOK ILP GP, L.L.C.,
	its General Partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

MAGELLAN MIDSTREAM PARTNERS, L.P.

By:	Magellan GP, LLC, its General Partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

[Signature Page to ONEOK Sixth Supplemental Indenture (2001 Indenture)]

ENLINK MIDSTREAM PARTNERS, LP

By:	EnLink Midstream GP, LLC,
	its General Partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

ELK MERGER SUB II, L.L.C.

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

[Signature Page to ONEOK Sixth Supplemental Indenture (2001 Indenture)]

	U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,
	as Trustee

	By:	/s/ Gregory M. Jackson
	Name:	Gregory M. Jackson
	Title:	Vice President

[Signature Page to ONEOK Sixth Supplemental Indenture (2001 Indenture)]

Schedule A
Currently Outstanding Securities

$400,000,000 6.00% Notes due 2035

Exhibit 4.14

ONEOK, INC.

as Issuer;

ONEOK PARTNERS, L.P.,

ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP,

MAGELLAN MIDSTREAM PARTNERS, L.P.,

ENLINK MIDSTREAM PARTNERS, LP,

and

ELK MERGER SUB II, L.L.C.

as Guarantors;

and

U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION

as Trustee

THIRTY-SECOND SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

INDENTURE

Dated as of January 26, 2012

Relating to Debt Securities

2.200% Notes due 2025

5.850% Notes due 2026

5.550% Notes due 2026

4.000% Notes due 2027

4.250% Notes due 2027

5.650% Notes due 2028

4.550% Notes due 2028

4.350% Notes due 2029

3.400% Notes due 2029

4.400% Notes due 2029

3.100% Notes due 2030

5.800% Notes due 2030

6.350% Notes due 2031

4.750% Notes due 2031

6.100% Notes due 2032

6.050% Notes due 2033

5.050% Notes due 2034

4.950% Notes due 2047

5.200% Notes due 2048

4.450% Notes due 2049

4.500% Notes due 2050

7.150% Notes due 2051

6.625% Notes due 2053

5.700% Notes due 2054

5.850% Notes due 2064

THIRTY-SECOND SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Supplemental Indenture”), among ONEOK, INC., an Oklahoma corporation (the “Company”), ONEOK PARTNERS, L.P., a Delaware limited partnership (the “Partnership”), ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP, a Delaware limited partnership (the “Intermediate Partnership”), MAGELLAN MIDSTREAM PARTNERS, L.P., a Delaware limited partnership (together with the Partnership and the Intermediate Partnership, the “Existing Guarantors”), EnLink Midstream Partners, LP, a Delaware limited partnership (“ENLK”), Elk Merger Sub II, L.L.C., a Delaware limited liability company (“Merger Sub II”) (each of ENLK and Merger Sub II, a “New Guarantor” and, collectively, the “New Guarantors” and, together with the Existing Guarantors, the “Guarantors”), and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (as successor in interest to U.S. Bank National Association), as trustee under the Indenture referred to below (in such capacity, the “Trustee”).

RECITALS

WHEREAS, the Company and the Trustee have heretofore entered into an Indenture, dated as of January 26, 2012 (the “Original Indenture” and, the Original Indenture, as amended and supplemented from time to time, including without limitation pursuant to this Supplemental Indenture, collectively being referred to herein as the “Indenture”);

WHEREAS, on the date hereof, pursuant to an Agreement and Plan of Merger, dated as of November 24, 2024 (the “Merger Agreement”), among the Company, Elk Merger Sub I, L.L.C., a Delaware limited liability company (“Merger Sub I”), Merger Sub II, EnLink Midstream, LLC, a Delaware limited liability company (“EnLink”), and EnLink Midstream Manager, LLC, a Delaware limited liability company and managing member of EnLink, (i) Merger Sub I merged with and into EnLink (the “First Merger”), with EnLink as the surviving company, and (ii) promptly following the First Merger, EnLink, as the surviving entity in the First Merger, merged with and into Merger Sub II (the “Second Merger”), with Merger Sub II surviving the Second Merger as a direct, wholly-owed subsidiary of the Company;

WHEREAS, all acts and requirements necessary to make this Supplemental Indenture a legal, valid and binding obligation of the Company and the Guarantors have been done; and

Article I
RELATION TO INDENTURE; DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

Section 1.01 Relation to Indenture. With respect to the Currently Outstanding Securities, this Supplemental Indenture constitutes an integral part of the Original Indenture.

Article II
AGREEMENT TO GUARANTEE

Section 2.01 Unconditional Guarantee.

(a) For value received, subject to Section 2.04 hereof, each of the New Guarantors hereby fully, irrevocably, unconditionally and absolutely guarantees to the Holders of each series of Currently Outstanding Securities and to the Trustee the due and punctual payment of the principal of, and premium, if any, and interest on such Currently Outstanding Securities, and all other amounts due and payable under the Indenture and such Currently Outstanding Securities by the Company to the Trustee or such Holders (including, without limitation, all costs and expenses (including reasonable legal fees and disbursements of its agents and counsel) incurred by the Trustee or such Holders in connection with the enforcement of the Indenture and the EnLink Guarantees (as defined below) (collectively, the “Indenture Obligations”), when and as such amounts shall become due and payable, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, according to the terms of such Currently Outstanding Securities and the Indenture. The guarantee by each New Guarantor set forth in this ARTICLE II is referred to herein as the “EnLink Guarantees.” Without limiting the generality of the foregoing, each New Guarantor’s liability shall extend to all amounts that constitute part of the Indenture Obligations and would be owed by the Company to the Trustee or such Holders under the Indenture and such Currently Outstanding Securities but for the fact that they are unenforceable, reduced, limited, impaired, suspended or not allowable due to the existence of a bankruptcy, reorganization or similar proceeding involving the Company.

(b) Failing payment when due of any amount guaranteed pursuant to the EnLink Guarantees, for whatever reason, each of the New Guarantors will be obligated (to the fullest extent permitted by applicable law) to pay the same immediately to the Trustee, without set-off or counterclaim or other reduction whatsoever (whether for taxes, withholding or otherwise). The EnLink Guarantees hereunder are intended to be general, unsecured, senior obligations of the New Guarantors and will rank pari passu in right of payment with all unsecured indebtedness of the New Guarantors that is not, by its terms, expressly subordinated in right of payment to the EnLink Guarantees of the New Guarantors. Each of the New Guarantors hereby agrees that, to the fullest extent permitted by applicable law, subject to Section 2.04 hereof, their obligations hereunder shall be full, irrevocable, unconditional and absolute, irrespective of the validity, regularity or enforceability of such Currently Outstanding Securities, the EnLink Guarantees or the Indenture, the absence of any action to enforce the same, any waiver or consent by any such Holder with respect to any provisions hereof or thereof, the recovery of any judgment against the Company, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or defense of the New Guarantors. Each of the New Guarantors hereby agrees that in the event of a default in payment of any Indenture Obligations, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, legal proceedings may be instituted by the Trustee on behalf of the Holders or, subject to Section 507 of the Indenture, by such Holders, on the terms and conditions set forth in the Indenture, directly against the New Guarantors to enforce the EnLink Guarantees without first proceeding against the Company.

(d) To the fullest extent permitted by applicable law, each of the New Guarantors hereby (i) waives diligence, presentment, demand of payment, notice of acceptance, filing of claims with a court in the event of the merger, insolvency or bankruptcy of the Company or the New Guarantors, and all demands and notices whatsoever, (ii) acknowledges that any agreement, instrument or document evidencing the EnLink Guarantees may be transferred and that the benefit of its obligations hereunder shall extend to each holder of any agreement, instrument or document evidencing the EnLink Guarantees without notice to them and (iii) covenants that the EnLink Guarantees will not be discharged except by complete performance of the EnLink Guarantees. To the fullest extent permitted by applicable law, each of the New Guarantors further agrees that if at any time all or any part of any payment theretofore applied by any Person to the EnLink Guarantees is, or must be, rescinded or returned for any reason whatsoever, including without limitation, the insolvency, bankruptcy or reorganization of the New Guarantors, the EnLink Guarantees shall, to the extent that such payment is or must be rescinded or returned, be deemed to have continued in existence notwithstanding such application, and the EnLink Guarantees shall continue to be effective or be reinstated, as the case may be, as though such application had not been made.

(f) To the fullest extent permitted by applicable law, no failure to exercise and no delay in exercising, on the part of the Trustee or the Holders, any right, power, privilege or remedy under this ARTICLE II and the EnLink Guarantees shall operate as a waiver thereof, nor shall any single or partial exercise of any rights, power, privilege or remedy preclude any other or further exercise thereof, or the exercise of any other rights, powers, privileges or remedies. The rights and remedies herein provided for are cumulative and not exclusive of any rights or remedies provided in law or equity. Nothing contained in this ARTICLE II shall limit the right of the Trustee or the Holders to take any action to accelerate the maturity of such Currently Outstanding Securities pursuant to ARTICLE FIVE of the Indenture or to pursue any rights or remedies under the Indenture or under applicable law.

Section 2.04 Release of Guarantee.

(a) Notwithstanding anything to the contrary in this ARTICLE II, if either of the New Guarantors (i) shall cease to be a Subsidiary of the Company or (ii) shall no longer be (x) an obligor on, or issuer of, any capital markets debt securities or (y) a guarantor of any capital markets debt securities issued by the Company or the other Guarantors, in each case other than the Currently Outstanding Securities or any other series of capital market debt securities of the Company outstanding on, and for which the applicable New Guarantor is giving a guarantee, the date hereof, then if no Default or Event of Default shall have occurred and be continuing, the applicable New Guarantor, upon giving written notice to the Trustee to the foregoing effect (which notice the Trustee may rely conclusively upon without investigation), shall be deemed to be released from all of its obligations under the Indenture, and the EnLink Guarantees shall be of no further force or effect with respect to the applicable New Guarantor. Following the receipt by the Trustee of any such notice, the Company shall cause the Indenture to be amended and supplemented as provided in Section 901 of the Indenture; provided, however, that the failure to so amend the Indenture shall not affect the validity of the release and termination of the EnLink Guarantees with respect to the applicable New Guarantor.

(b) In addition, upon (i) the exercise of the legal defeasance or covenant defeasance option or the satisfaction and discharge of the Indenture as provided in ARTICLES FOUR and FIFTEEN, respectively, of the Indenture with respect to a series of Currently Outstanding Securities, or (ii) a series of Currently Outstanding Securities ceasing to be Outstanding, each New Guarantor shall be deemed to be released from all its obligations under the Indenture with respect to such series of Currently Outstanding Securities and the EnLink Guarantees of such series of Currently Outstanding Securities shall be of no further force or effect.

Article III

MISCELLANEOUS

Section 3.02 No Recourse Against Others. No director, officer, employee, partner (including, for greater certainty, any general partner of any general partnership who is an individual person), incorporator, manager, stockholder or member of the Company or any Guarantor, as such, will have any liability for any obligations of the Company, the New Guarantors or the other Guarantors under the Currently Outstanding Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. The waiver and release are part of the consideration for the issuance of the EnLink Guarantees and the Currently Outstanding Securities.

Section 3.03 Certain Trustee Matters.

The recitals contained herein shall be taken as the statements of the Company and the Guarantors, and the Trustee assumes no responsibility for their correctness.

Except as expressly set forth herein, nothing in this Supplemental Indenture shall alter the duties, rights, privileges, immunities or obligations of the Trustee set forth in the Original Indenture and the Trustee shall be indemnified and held harmless in accordance with the terms thereof as fully and with like effect as if set forth herein in full.

(signature page follows)

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and delivered, all as of the day and year first above written.

	ONEOK, INC.

	By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

	ONEOK PARTNERS, L.P.

	By:	ONEOK Partners GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

	By:	ONEOK ILP GP, L.L.C.,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	MAGELLAN MIDSTREAM PARTNERS, L.P.

	By:	Magellan GP, LLC, its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

[Signature Page to ONEOK Thirty-Second Supplemental Indenture]

	ENLINK MIDSTREAM PARTNERS, LP

	By:	EnLink Midstream GP, LLC,
		its General Partner

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relations and Corporate Development

	ELK MERGER SUB II, L.L.C.

	By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

[Signature Page to ONEOK Thirty-Second Supplemental Indenture]

	U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,
	as Trustee

	By:	/s/ Gregory M. Jackson
	Name:	Gregory M. Jackson
	Title:	Vice President

[Signature Page to ONEOK Thirty-Second Supplemental Indenture]

Schedule A
Currently Outstanding Securities

$387,000,000 2.200% Notes due 2025

$600,000,000 5.850% Notes due 2026

$750,000,000 5.550% Notes due 2026

$500,000,000 4.000% Notes due 2027

$1,250,000,000 4.250% Notes due 2027

$750,000,000 5.650% Notes due 2028

$800,000,000 4.550% Notes due 2028

$700,000,000 4.350% Notes due 2029

$714,251,000 3.400% Notes due 2029

$600,000,000 4.400% Notes due 2029

$780,093,000 3.100% Notes due 2030

$500,000,000 5.800% Notes due 2030

$600,000,000 6.350% Notes due 2031

$1,250,000,000 4.750% Notes due 2031

$750,000,000 6.100% Notes due 2032

$1,500,000,000 6.050% Notes due 2033

$1,600,000,000 5.050% Notes due 2034

$564,006,000 4.950% Notes due 2047

$919,000,000 5.200% Notes due 2048

$576,030,000 4.450% Notes due 2049

$443,015,000 4.500% Notes due 2050

$300,000,000 7.150% Notes due 2051

$1,750,000,000 6.625% Notes due 2053

$1,500,000,000 5.700% Notes due 2054

$800,000,000 5.850% Notes due 2064

Exhibit 4.15

ONEOK PARTNERS, L.P.

as Issuer;

ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP,

ONEOK, Inc.,

MAGELLAN MIDSTREAM PARTNERS, L.P.,

ENLINK MIDSTREAM PARTNERS, LP

and

ELK MERGER SUB II, L.L.C.

as Guarantors;

and

COMPUTERSHARE TRUST COMPANY, N.A.

as successor to Wells Fargo Bank, N.A.,

as Trustee

SEVENTEENTH SUPPLEMENTAL INDENTURE

Dated as of January 31, 2025

INDENTURE

Relating to Senior Debt Securities

Dated as of September 25, 2006

6.650% Senior Notes due 2036

6.850% Senior Notes due 2037

6.125% Senior Notes due 2041

6.200% Senior Notes due 2043

SEVENTEENTH SUPPLEMENTAL INDENTURE, dated as of January 31, 2025 (this “Supplemental Indenture”), among ONEOK PARTNERS, L.P., a Delaware limited partnership (the “Partnership”), ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP, a Delaware limited partnership (“ONEOK ILP”), ONEOK, Inc., an Oklahoma corporation (“ONEOK”), MAGELLAN MIDSTREAM PARTNERS, L.P., a Delaware limited Partnership (together with ONEOK ILP and ONEOK, the “Existing Guarantors”), ENLINK MIDSTREAM PARTNERS, LP, a Delaware limited partnership (“ENLK”), and ELK MERGER SUB II, L.L.C., a Delaware limited liability company (“Merger Sub II”) (each of ELNK and Merger Sub II, a “New Guarantor” and, collectively, the “New Guarantors” and, together with the Existing Guarantors, the “Guarantors”), and COMPUTERSHARE TRUST COMPANY, N.A., as successor to Wells Fargo Bank, N.A., as trustee under the Indenture referred to below (in such capacity, the “Trustee”).

RECITALS

WHEREAS, the Partnership, the Existing Guarantors and the Trustee have heretofore entered into an Indenture, dated as of September 25, 2006 (the “Original Indenture” and, the Original Indenture, as amended and supplemented from time to time, including without limitation pursuant to this Supplemental Indenture, being referred to herein as the “Indenture”);

WHEREAS, on the date hereof, pursuant to an Agreement and Plan of Merger, dated as of November 24, 2024 (the “Merger Agreement”), among ONEOK, Elk Merger Sub I, L.L.C., a Delaware limited liability company (“Merger Sub I”), Merger Sub II, EnLink Midstream, LLC, a Delaware limited liability company (“EnLink”), and EnLink Midstream Manager, LLC, a Delaware limited liability company and managing member of EnLink, (i) Merger Sub I merged with and into EnLink (the “First Merger”), with EnLink as the surviving company, and (ii) promptly following the First Merger, EnLink, as the surviving entity in the First Merger, merged with and into Merger Sub II (the “Second Merger”), with Merger Sub II surviving the Second Merger as a direct, wholly-owed subsidiary of ONEOK;

WHEREAS, Section 9.01 of the Original Indenture provides that the Partnership, each Guarantor and the Trustee may from time to time and at any time, without the consent of Holders, enter into a supplemental indenture to add to the covenants of the Partnership or any Guarantor such further covenants, restrictions, conditions or provisions for the protection of the Holders of all or any series of Debt Securities as the Board of Directors shall consider to be for the protection of the Holders of such Debt Securities or to make any change that does not adversely affect the rights of any Holder;

WHEREAS, in connection with the transactions contemplated by the Merger Agreement, the New Guarantors desire to become guarantors of, and provide guarantees of, the currently outstanding debt securities, the titles of the series and the current outstanding principal amounts thereof being set forth on Schedule A hereto (collectively, the “Currently Outstanding Securities”); and

WHEREAS, this Supplemental Indenture has not resulted in a material modification of the Currently Outstanding Securities for Foreign Account Tax Compliance Act purposes, and all things necessary to make this Supplemental Indenture a legal, valid and binding agreement of the Partnership, the Existing Guarantors and the New Guarantors have been done.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, each of the New Guarantors hereby guarantees the Partnership’s obligations under the Currently Outstanding Securities as follows:

Article I
RELATION TO INDENTURE; DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

Section 1.01 Relation to Indenture. With respect to the Currently Outstanding Securities, this Supplemental Indenture constitutes an integral part of the Indenture.

Article II
AGREEMENT TO GUARANTEE

Section 2.01 Agreement to Guarantee.

(a) Except as provided below, each of the New Guarantors hereby agrees to provide a full and unconditional Guarantee (the “EnLink Guarantees”) to the Holders of the Currently Outstanding Securities on the terms and subject to the conditions set forth in Article XII of the Original Indenture.

(b) If either of the New Guarantors (i) shall cease to be a Subsidiary of ONEOK or (ii) shall no longer be (x) an obligor on, or issuer of, any capital markets debt securities or (y) a guarantor of any capital markets debt securities issued by the Partnership or the Existing Guarantors, in each case other than the Currently Outstanding Securities, then if no Default or Event of Default shall have occurred and be continuing, the applicable New Guarantor, upon giving notice to the Trustee to the foregoing effect, shall be deemed to be released from all of its obligations under the Indenture, and the EnLink Guarantees shall be of no further force or effect with respect to the applicable New Guarantor. Following the receipt by the Trustee of any such notice, the Partnership and ONEOK shall cause the Indenture to be amended as provided in Section 9.01 of the Indenture; provided, however, that the failure to so amend the Indenture shall not affect the validity of the termination of the EnLink Guarantees with respect to the applicable New Guarantor.

(c) In addition, each of the EnLink Guarantees shall be terminated and discharged and shall be of no further force and effect, and each of the New Guarantors shall be automatically and unconditionally released from all of their obligations under the EnLink Guarantees and the Indenture, with respect to a series of Currently Outstanding Securities, solely upon (i) the legal defeasance, covenant defeasance or satisfaction and discharge of the Indenture with respect to such series of Currently Outstanding Securities as provided in ARTICLE XI of the Indenture or (ii) such series of Currently Outstanding Securities ceasing to be Outstanding.

(d) As used in this Supplemental Indenture and in Sections 12.01 and 12.02 of the Original Indenture only, the terms “Guarantor,” “New Guarantors,” “Guarantee” and “EnLink Guarantees” shall include the New Guarantors. Notwithstanding anything in this Supplemental Indenture to the contrary, other than with respect to this Supplemental Indenture and in Sections 12.01, 12.02, 12.03 and 12.04 of the Original Indenture, the New Guarantors will not be considered Guarantors, and the EnLink Guarantees will not be considered Guarantees, for any purpose under the Indenture. Therefore, other than as set forth in this Supplemental Indenture and in Sections 12.01 and 12.02 of the Original Indenture, the New Guarantors will not be subject to the Indenture and will not be subject to any covenants or restrictions contained in the Indenture, including, without limitation, with respect to any merger, consolidation or sale of assets.

Section 2.02 Benefits Acknowledged. Each of the New Guarantors acknowledges that it shall receive direct and indirect benefits from the financing arrangements contemplated by the Indenture and from the EnLink Guarantees under this Supplemental Indenture.

Article III
MISCELLANEOUS

Section 3.01 Notices. Notices to the New Guarantors shall be made in accordance with Section 13.03 of the Indenture at the address for the Partnership set forth in such Section. Notices to the Trustee shall be made in accordance with Section 13.03 of the Indenture at the address set forth below:

Computershare Trust Company, N.A.

1505 Energy Park Drive

St. Paul, MN 55108

Attn: CCT Administrator for ONEOK Partners, L.P.

Section 3.02 No Recourse Against Others. No director, officer, employee, partner (including, for greater certainty, any general partner of any general partnership who is an individual person), incorporator, manager, stockholder or member of the Partnership or any Guarantor, as such, will have any liability for any obligations of the Partnership, the New Guarantors or any other Guarantor under the Currently Outstanding Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. The waiver and release are part of the consideration for the issuance of the EnLink Guarantees and the Currently Outstanding Securities.

Section 3.03 Certain Trustee Matters.

The recitals contained herein shall be taken as the statements of the Partnership and the Guarantors, and the Trustee makes no representation as to and assumes no responsibility for their correctness.

The Trustee makes no representations as to and shall not be responsible for the validity or sufficiency of this Supplemental Indenture, or the proper authorization or the due execution hereof or thereof by the Partnership or any of the Guarantors.

Except as expressly set forth herein, nothing in this Supplemental Indenture shall alter the duties, rights, privileges, protections, limitations liability, indemnities, immunities or obligations of the Trustee set forth in the Original Indenture. In entering into this Supplemental Indenture, the Trustee shall be entitled to the benefit of every provision of the Indenture relating to the conduct or affecting the liability of or affording protection to the Trustee, whether or not elsewhere herein so provided.

Section 3.04 Continued Effect. Except as expressly supplemented and amended by this Supplemental Indenture, the Original Indenture shall continue in full force and effect in accordance with the provisions, terms, and conditions thereof, and the Original Indenture (as supplemented and amended by this Supplemental Indenture) is in all respects hereby ratified and confirmed. This Supplemental Indenture and all its provisions shall be deemed a part of the Original Indenture in the manner and to the extent herein and therein provided. Reference to this Supplemental Indenture need not be made in the Indenture or any other instrument or document executed in connection therewith, or in any certificate, letter or communication issued or made pursuant to, or with respect to, the Indenture, any reference in any of such items to the Indenture being sufficient to refer to the Indenture as amended hereby.

Section 3.05 Governing Law. This Supplemental Indenture, the Currently Outstanding Securities and the Guarantees shall be governed by and construed in accordance with the laws of the State of New York. This Supplemental Indenture and the Currently Outstanding Securities are subject to the provisions of the Trust Indenture Act that are required to be part of this Supplemental Indenture and the Currently Outstanding Securities and shall, to the extent applicable, be governed by such provisions.

Section 3.06 Counterparts. This Supplemental Indenture shall be valid, binding, and enforceable against a party only when executed and delivered by an authorized individual on behalf of the party by means of (a) any electronic signature permitted by the federal Electronic Signatures in Global and National Commerce Act, state enactments of the Uniform Electronic Transactions Act, and/or any other relevant electronic signatures law, including relevant provisions of the Uniform Commercial Code (collectively, “Signature Law”); (b) an original manual signature; or (c) a faxed, scanned, or photocopied manual signature. Each electronic signature or faxed, scanned, or photocopied manual signature shall for all purposes have the same validity, legal effect, and admissibility in evidence as an original manual signature. Each party hereto shall be entitled to conclusively rely upon, and shall have no liability with respect to, any faxed, scanned, or photocopied manual signature, or other electronic signature, of any party and shall have no duty to investigate, confirm or otherwise verify the validity or authenticity thereof. This Supplemental Indenture may be executed in any number of counterparts, each of which shall be deemed to be an original, but such counterparts shall, together, constitute one and the same instrument. For avoidance of doubt, original manual signatures shall be used for execution or indorsement of writings when required under the Uniform Commercial Code or other Signature Law due to the character or intended character of the writings.

Section 3.07 Jury Trial Waiver. EACH OF THE PARTNERSHIP, THE GUARANTORS AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE OR THE TRANSACTIONS CONTEMPLATED HEREBY.

(Signature pages follow)

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and delivered, all as of the day and year first above written.

ONEOK PARTNERS, L.P.

By:	ONEOK Partners GP, L.L.C.,
	its General Partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

ONEOK, INC.

By:	/s/ Pierce H. Norton II
	Name:	Pierce H. Norton II
	Title:	President and Chief Executive Officer

ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP

By:	ONEOK ILP GP, L.L.C.,
	its General Partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor Relations and Corporate Development

MAGELLAN MIDSTREAM PARTNERS, L.P.

By:	Magellan GP, LLC, its General Partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor Relations and Corporate Development

[Signature Page to ONEOK Partners Seventeenth Supplemental Indenture]

ELK MERGER SUB II, L.L.C.

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

ENLINK MIDSTREAM PARTNERS, LP

By:	EnLink Midstream GP, LLC,
	its General Partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and Executive Vice President, Investor Relations and Corporate Development

[Signature Page to ONEOK Partners Seventeenth Supplemental Indenture]

	COMPUTERSHARE TRUST COMPANY, N.A.,
	as Trustee

	By:	/s/ Katherine M. O’Brien Mathis
	Name:	Katherine M. O’Brien Mathis
	Title:	Vice President

[Signature Page to ONEOK Partners Seventeenth Supplemental Indenture]

Schedule A
Currently Outstanding Securities

$600,000,000 6.650% Senior Notes due 2036

$600,000,000 6.850% Senior Notes due 2037

$650,000,000 6.125% Senior Notes due 2041

$400,000,000 6.200% Senior Notes due 2043

Exhibit 10.1

GUARANTY AGREEMENT JOINDER

This Guaranty Agreement Joinder is dated as of January 31, 2025 and is executed by Elk Merger Sub II, L.L.C., a Delaware limited liability company (“Merger Sub II”) and EnLink Midstream Partners, LP, a Delaware limited partnership (“EnLink” and, together with Merger Sub II, the “Additional Guarantors”, and each an “Additional Guarantor”), in favor of Citibank, N.A., as administrative agent (the “Administrative Agent”) and the Lenders (as defined below). All capitalized terms not defined herein shall have the meaning ascribed to them in the Credit Agreement hereinafter referenced.

RECITALS

WHEREAS, ONEOK, Inc., an Oklahoma corporation (the “Borrower”), is party to that certain Amended and Restated Credit Agreement dated as of June 10, 2022, among the Borrower, the Lenders from time to time party thereto (collectively, the “Lenders”; individually, a “Lender”) and Citibank, N.A., as Administrative Agent, an L/C Issuer and a Swing Line Lender, (as amended by that certain First Amendment to Amended and Restated Credit Agreement, dated as of May 26, 2023 and as otherwise amended, supplemented or otherwise modified from time to time, the “Credit Agreement”);

WHEREAS, ONEOK Partners Intermediate Limited Partnership and ONEOK Partners, L.P., each a Delaware limited partnership, have executed that certain Amended and Restated Guaranty Agreement, dated as of June 10, 2022 in favor of Administrative Agent (as supplemented by that certain Guaranty Agreement Joinder, dated as of September 25, 2023 and as amended, restated, or otherwise modified from time to time, the “Guaranty Agreement”); and

WHEREAS, each Additional Guarantor has agreed to execute and deliver this Guaranty Agreement Joinder in order to become a party to the Guaranty Agreement and a Guarantor under the Credit Agreement.

AGREEMENTS

NOW, THEREFORE, in consideration of the foregoing premises and to induce the Lenders to continue to extend credit to the Borrower in accordance with the Credit Agreement, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, each Additional Guarantor, for the benefit of the Administrative Agent and the Lenders, hereby agrees as follows:

1. Each Additional Guarantor shall be a Guarantor for purposes of the Guaranty Agreement, effective from the date hereof, and agrees to perform all of the obligations of a Guarantor under, and to be bound in all respects by the terms of, the Guaranty Agreement (including all waivers, releases, indemnifications and submissions set forth therein), all of which terms are incorporated herein by reference, as if such Additional Guarantor were a signatory party thereto; and, accordingly, each Additional Guarantor hereby, jointly and severally with the other Guarantors party to the Guaranty Agreement, unconditionally and irrevocably guarantees the prompt and complete payment when due, whether at stated maturity, by acceleration or otherwise, of the Obligations, and further agrees to pay any and all expenses (including the legal fees, charges and disbursements of counsel) incurred by any Lender in enforcing any rights under the Guaranty Agreement, in all respects upon the terms set forth in the Guaranty Agreement. Notwithstanding anything contained herein or in the Guaranty Agreement to the contrary, the obligations of each Additional Guarantor under the Guaranty Agreement shall be limited to an aggregate amount equal to the largest amount that would not render its obligations under the Guaranty Agreement subject to avoidance under Section 548 of the Bankruptcy Code (Title 11, United States Code) or any comparable provisions of any applicable federal or state law.

2. From and after the date hereof, all references to the “Guarantors,” or each individual “Guarantor,” in the Credit Agreement shall be deemed to include the Additional Guarantors, in addition to the other Guarantors.

3. Each Additional Guarantor hereby represents and confirms that the representations and warranties of the Guarantors set forth in the Credit Agreement and incorporated by reference in the Guaranty Agreement are true and correct in all material respects with respect to such Additional Guarantor on and as of the date hereof (and after giving effect hereto), as if set forth herein in their entirety.

4. This Guaranty Agreement Joinder and the rights and obligations of the parties hereunder shall be governed by and construed and interpreted in accordance with the laws of the State of New York. Acceptance and notice of acceptance hereof are hereby waived in all respects.

5. This Guaranty Agreement Joinder may be executed in counterparts (and by different parties hereto on different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract. This Guaranty Agreement Joinder shall become effective when the Administrative Agent shall have received counterparts hereof that, when taken together, bear the signatures of each Additional Guarantor and the Administrative Agent. Delivery of an executed signature page to this Guaranty Agreement Joinder by facsimile transmission or other electronic imaging means (e.g. “pdf” or “tif”) shall be effective as delivery of a manually signed counterpart hereof.

6. This Guaranty Agreement Joinder is a Loan Document.

7. All communications and notices hereunder shall be in writing and given as provided in the Guaranty Agreement. All communications and notices hereunder to the Additional Guarantors shall be given to it at the address set forth on Schedule I to this Guaranty Agreement Joinder.

8. This Guaranty Agreement Joinder, the Guaranty Agreement, and the other Loan Documents represent the final agreement among the parties and may not be contradicted by evidence of prior, contemporaneous, or subsequent oral agreements of the parties. There are no unwritten oral agreements among the parties.

[Signature Page to Follow]

IN WITNESS WHEREOF, the undersigned Additional Guarantors have caused this Guaranty Agreement Joinder to be duly executed and delivered by its officer thereunto duly authorized as of the date first set forth above.

ENLINK MIDSTREAM PARTNERS, LP

By:	EnLink Midstream GP, LLC, its general partner

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer, Treasurer and
		Executive Vice President, Investor
		Relation and Corporate Development

ELK MERGER SUB II, L.L.C.

By:	/s/ Walter S. Hulse III
	Name:	Walter S. Hulse III
	Title:	Chief Financial Officer

[Signature Page to Guaranty Agreement Joinder]

ACKNOWLEDGED AND ACCEPTED,
as of the date above first written:

CITIBANK, N.A.,
as Administrative Agent

By:	/s/ Maureen P. Maroney
	Name:	Maureen P. Maroney
	Title:	Vice President

[Signature Page to Guaranty Agreement Joinder]

SCHEDULE I TO THE
GUARANTY AGREEMENT JOINDER

c/o ONEOK, Inc.

100 West Fifth Street

Tulsa, Oklahoma 74103

Attn: Walter S. Hulse III

Cover	Jan. 31, 2025
Cover [Abstract]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Jan. 31, 2025
Entity File Number	001-13643
Entity Registrant Name	ONEOK, Inc.
Entity Central Index Key	0001039684
Entity Tax Identification Number	73-1520922
Entity Incorporation, State or Country Code	OK
Entity Address, Address Line One	100 West Fifth Street
Entity Address, City or Town	Tulsa
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	74103
City Area Code	918
Local Phone Number	588-7000
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common stock, par value of $0.01
Trading Symbol	OKE
Security Exchange Name	NYSE
Entity Emerging Growth Company	false

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