ESMK Esmark (MM)

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE TO
Amendment No. 4
Tender Offer Statement Under Section 14(d)(1)
or Section 13(e)(1) of the Securities Exchange Act of 1934

Esmark Incorporated
(Name of Subject Company (Issuer))

OAO Severstal
(Name of Filing Person (Offeror))

COMMON STOCK, PAR VALUE $0.01 PER SHARE
(Title of Class of Securities)

296475106
(CUSIP Number of Class of Securities)

Sergei Kuznetsov
Chief Financial Officer
OAO Severstal
Klara Tsetkin, 2/3
Moscow, Russia 127299
Telephone: 7 495 540 77 69
(Name, address and telephone number of
person authorized to receive notices
and communications on behalf of filing persons)

With Copy to:
Gary P. Cullen, Esq.
Shilpi Gupta, Esq.
Skadden, Arps, Slate, Meagher & Flom LLP
333 West Wacker Drive
Chicago, Illinois 60606
Telephone: (312) 407-0700

CALCULATION OF FILING FEE

Transaction Valuation*: $ 677, 854,787                        Amount of Filing Fee**: $ 26,639.69

*

Estimated for purposes of calculating the filing fee only. This calculation assumes the purchase of 39,873,811 shares of common stock, par value $0.01 per share ("Shares"), of Esmark Incorporated at the tender offer price of $17.00 per share of common stock. Based upon information contained in Esmark Incorporated's annual report on Form 10-K for the fiscal year ended December 31, 2007, filed with the SEC on May 20, 2008, as of May 13, 2008, there were 39,506,720 Shares outstanding and, as of December 31, 2007, there were a maximum of 367,091 Shares issuable pursuant to existing stock options and stock units awards.

**

The amount of filing fee is calculated in accordance with Rule 0-11(a)(2) under the Securities Exchange Act of 1934, as amended, and Fee Rate Advisory #6 For Fiscal Year 2008 issued by the Securities and Exchange Commission on December 27, 2007. Such fee equals $39.30 per $1,000,000 of the transaction value.

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Check the box if any part of the fee is offset as provided by Rule 0-11(a)(2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

o

Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the statement relates:

ý

third-party tender offer subject to Rule 14d-1.

o

issuer tender offer subject to Rule 13e-4.

o

going-private transaction subject to Rule 13e-3.

o

amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results of the tender offer: o

        This Amendment No. 4 (this "Amendment No. 4") amends and supplements the Tender Offer Statement on Schedule TO originally filed with the Securities and Exchange Commission on May 30, 2008 (the "Schedule TO"), as amended and supplemented by Amendment No. 1 to the Schedule TO filed with the Commission on June 5, 2008 ("Amendment No. 1"), by Amendment No. 2 to the Schedule TO filed with the Commission on June 6, 2008 ("Amendment No. 2") and by Amendment No. 3 to the Schedule TO filed with the Commission on June 17, 2008 ("Amendment No. 3"), by OAO Severstal, a Russian joint stock company ("Severstal"), on behalf of its indirect, wholly owned subsidiary ("Purchaser") that will be formed in the state of Delaware prior to the expiration of the offer. The Schedule TO, as amended, relates to Severstal's offer, on behalf of Purchaser, to purchase all of the issued and outstanding shares of common stock, par value $0.01 per share (the "Shares"), of Esmark Incorporated, a Delaware corporation (the "Company"), for $17.00 per Share, net to the seller in cash (less applicable withholding taxes and without interest). Severstal's offer is made upon the terms and conditions described in the Offer to Purchase, dated May 30, 2008, as amended (the "Offer to Purchase"), and in the Letter of Transmittal and instructions thereto (which, as they each may be amended or supplemented from time to time, together constitute the "Offer").

        Except as specifically set forth herein, this Amendment No. 4 does not modify any of the information previously reported on the Schedule TO, Amendment No. 1, Amendment No. 2 or Amendment No. 3. You should read this Amendment No. 4 together with the Schedule TO, Amendment No. 1, Amendment No. 2 and Amendment No. 3. Capitalized terms used but not defined herein shall have the meanings assigned to such terms in the Offer to Purchase.

ITEM 5.    PAST CONTACTS, TRANSACTIONS, NEGOTIATIONS AND AGREEMENTS.

        Section 10 ("Background of the Offer; Contacts with the Company") of the Offer to Purchase, incorporated herein by reference, is hereby amended by adding the following after the last paragraph:

        "On June 19, 2008, Severstal submitted, through Skadden Arps, a letter to the Company Board stating as follows:

        'We would like to reiterate our continued strong interest in acquiring Esmark Incorporated pursuant to our previously announced tender offer for all outstanding shares of Esmark common stock. We also believe that Severstal is uniquely positioned to promptly consummate an acquisition of Esmark, given the full and enthusiastic support of our proposal by the United Steelworkers and your majority shareholder.

        We understand that the arbitrator in the United Steelworkers' right to bid grievance arbitration with Esmark may consider setting aside Esmark's Memorandum of Agreement with Essar Steel Holdings Limited.

        If the arbitrator sets aside the Memorandum of Agreement, Severstal is aware of and understands Esmark's financing issues with respect to the loan agreements you entered into with Essar Steel and your other financing agreements. This is to confirm that we are prepared to immediately replace the Essar financing in a manner that satisfies Esmark's obligations to all credit parties and does not jeopardize Esmark's business.

        We stand ready to conclude a transaction expeditiously."'

        The full text of the press release Severstal issued on June 19, 2008 announcing the delivery of the above letter is filed as Exhibit (a)(5)(E) hereto.

ITEM 8.    INTEREST IN SECURITIES OF THE SUBJECT COMPANY.

        Section 10 ("Background of the Offer; Contacts with the Company") of the Offer to Purchase, incorporated herein by reference, is hereby amended as set forth in Item 5 of this Amendment No. 4.

1

ITEM 9.    PERSONS/ASSETS, RETAINED, EMPLOYED, COMPENSATED OR USED.

        Section 10 ("Background of the Offer; Contacts with the Company") of the Offer to Purchase, incorporated herein by reference, is hereby amended as set forth in Item 5 of this Amendment No. 4.

ITEM 11.    ADDITIONAL INFORMATION.

        (b)   Section 10 ("Background of the Offer; Contacts with the Company") of the Offer to Purchase, incorporated herein by reference, is hereby amended as set forth in Item 5 of this Amendment No. 4.

ITEM 12.    EXHIBITS.

        Item 12 of the Schedule TO is hereby amended and supplemented by adding the following exhibits:

        (a)(5)(E)    Press Release issued by Severstal, dated June 19, 2008

2

SIGNATURE

        After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

3

EXHIBIT INDEX

*

Previously filed

4

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