FORM 4
[ X ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

ARCLIGHT ENERGY PARTNERS FUND V, L.P. 		2. Issuer Name and Ticker or Trading Symbol

Third Coast Midstream, LLC [ AMID ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      __ X __ 10% Owner
_____ Officer (give title below)      __ X __ Other (specify below)
SEE REMARKS
(Last)          (First)          (Middle)

C/O ARCLIGHT CAPITAL PARTNERS, LLC, 200 CLARENDON STREET, 55TH FLOOR 		3. Date of Earliest Transaction (MM/DD/YYYY)

7/23/2019
(Street)

BOSTON, MA 02117
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Units (limited partner interests)   7/23/2019     D    42514126   (1) D $0.00   0   (2) (3) (4) I   See footnote   (1)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
(1)  Represents common units representing limited partnership interests (the "Common Units") of Third Coast Midstream, LLC (f/k/a American Midstream Partners, LP), a Delaware limited liability company (the "Issuer").
(2)  Pursuant to that certain Master Contribution Agreement, dated July 22, 2019, by and among Anchor Midstream Acquisition, LLC, a Delaware limited liability company ("Anchor Acquisition"), 3CM Holdings, LLC (f/k/a High Point Infrastructure Partners, LLC), a Delaware limited liability company ("3CM"), Third Coast Midstream Holdings, LLC (f/k/a/ American Midstream GP, LLC), a Delaware limited liability company (the "General Partner"), Magnolia Infrastructure Holdings, LLC, a Delaware limited liability company ("Magnolia Holdings"), Magnolia Infrastructure Partners, LLC, a Delaware limited liability company ("Magnolia"), AMID GP Holdings, LLC, a Delaware limited liability company ("AMID GP"), JP Energy Development, L.P., a Delaware limited partnership ("JP Energy"), Busbar II, LLC, a Delaware limited liability company ("Busbar"), High Point Energy, LLC, a Texas limited liability company, ArcLight Energy Partners Fund V, L.P.,
(3)  (continued from footnote 2) a Delaware limited partnership ("Fund V"), Stephen W. Bergstrom, individually ("Bergstrom") and Daniel C. Campbell, individually, (i) JP Energy, as holder of 422,805 Common Units, transferred all of its Common Units to Magnolia Holdings, (ii) Magnolia Holdings, as holder of 20,372,720 Common Units, transferred all of its Common Units to the General Partner, (iii) Magnolia, as holder of 5,108,669 Common Units, transferred all of its Common Units to the General Partner, (iv) Busbar, as holder of 2,853,482 Common Units, transferred all of its Common Units to the General Partner and (v) Bergstrom, as holder of 64,221 Common Units, transferred all of his Common Units to the General Partner. Immediately following the preceding transactions, the General Partner, as holder of 41,209,117 Common Units, transferred all of its Common Units to Anchor Acquisition.
(4)  On July 23, 2019, pursuant to a Plan of Conversion adopted by the Issuer, the Issuer converted into a Delaware limited liability company named "Third Coast Midstream, LLC" ("Third Coast Midstream" and, such conversion, the "AMID Conversion"). In connection with the AMID Conversion, each Common Unit issued and outstanding immediately prior to the AMID Conversion was converted into one limited liability company unit of Third Coast Midstream. Magnolia Holdings also beneficially owns 1,369,230 Common Units issuable upon exercise of the warrants issued to Magnolia Holdings by the Issuer, dated July 18, 2019. After the AMID Conversion, all of the outstanding warrants converted into the right to receive 1,369,230 limited liability company units of Third Coast Midstream. As a result of the AMID Conversion, all Common Units were cancelled and ceased to be outstanding and none of JP Energy, Magnolia Holdings, Magnolia and Busbar beneficially own any Common Units.

Remarks:
(A) ArcLight Capital Holdings, LLC ("ArcLight Holdings") is the sole manager and member of ArcLight Capital Partners, LLC ("ArcLight Partners" and, together with ArcLight Holdings and Fund V, the "ArcLight Entities"). ArcLight Partners is the investment adviser to Fund V. ArcLight Holdings is the manager of the general partner of Fund V. Mr. Revers is a manager of ArcLight Holdings, and a managing partner of ArcLight Partners and has certain voting and dispositive rights as a member of ArcLight Partners' investment committee. Fund V directly owns Busbar and Magnolia Holdings, which owns Magnolia. Fund V, through Magnolia, also owns approximately 90% of the ownership interest in 3CM. 3CM and AMID GP, a subsidiary of Magnolia Holdings, own respectively, approximately 86% and 14% of the General Partner. (B) Some of the entity names in the signature blocks have been abbreviated due to the limitations of the electronic filing system. Please refer to the text above for the complete legal names of such entities.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
ARCLIGHT ENERGY PARTNERS FUND V, L.P.
C/O ARCLIGHT CAPITAL PARTNERS, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON, MA 02117 		X X
SEE REMARKS
Magnolia Infrastructure Holdings, LLC
C/O ARCLIGHT CAPITAL PARTNERS, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON, MA 02117 		X X

Magnolia Infrastructure Partners, LLC
C/O ARCLIGHT CAPITAL PARTNERS, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON, MA 02117 		X X

American Midstream GP, LLC
C/O ARCLIGHT CAPITAL PARTNERS, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON,, MA 02117 		X X

High Point Infrastructure Partners, LLC
C/O ARCLIGHT CAPITAL PARTNERS, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON, MA 02117 		X X

AMID GP Holdings, LLC
C/O ARCLIGHT CAPITAL PARTNERS, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON, MA 02117 		X X

ArcLight Capital Holdings, LLC
C/O ARCLIGHT CAPITAL PARTNERS, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON, MA 02117 		X X

ArcLight Capital Partners, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON, MA 02117 		X X

Revers Daniel R
C/O ARCLIGHT CAPITAL PARTNERS, LLC
200 CLARENDON STREET, 55TH FLOOR
BOSTON, MA 02117 		X X


Signatures
/s/ Daniel R. Revers FUND V By: ArcLight PEF GP V, LLC, its General Partner By: ArcLight Capital Holdings, LLC, its Manager By: ACHP II, L.P., its Managing Member By: ACH GP, LLC, its General Partner By: Daniel R. Revers, Manager 7/24/2019
** Signature of Reporting Person Date

/s/ Daniel R. Revers, President MAGNOLIA INFRASTRUCTURE HOLDINGS, LLC By: Daniel R. Revers, President 7/24/2019
** Signature of Reporting Person Date

/s/ Daniel R. Revers MAGNOLIA INFRASTRUCTURE PARTNERS, LLC By: Daniel R. Revers, President 7/24/2019
** Signature of Reporting Person Date

/s/ Daniel R. Revers THIRD COAST MIDSTREAM HOLDINGS, LLC By: its Class A Member, 3CM Holdings, LLC By: Daniel R. Revers, President 7/24/2019
** Signature of Reporting Person Date

/s/ Daniel R. Revers 3CM HOLDINGS, LLC By: Daniel R. Revers, President 7/24/2019
** Signature of Reporting Person Date

/s/ Daniel R. Revers AMID GP HOLDINGS, LLC By: Daniel R. Revers, President 7/24/2019
** Signature of Reporting Person Date

/s/ Daniel R. Revers ARCLIGHT CAPITAL HOLDINGS, LLC By: ACHP II, L.P., its Managing Member By: ACH GP, LLC, its General Partner By: Daniel Revers, Manager 7/24/2019
** Signature of Reporting Person Date

/s/ Daniel R. Revers ARCLIGHT CAPITAL PARTNERS, LLC By: Daniel R. Revers, Managing Partner 7/24/2019
** Signature of Reporting Person Date

/s/ Daniel R. Revers 7/24/2019
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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