FORM 4 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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Coslov I Michael   2. Issuer Name and Ticker or Trading Symbol TMS International Corp. [TMS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O TMS INTERNATIONAL CORP., 12 MONONGAHELA AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 05/15/2012 (Street) GLASSPORT, PA 15045 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 Class A Common Stock 05/15/2012   C   49,468 A (1) 49,468 D   Class A Common Stock 05/15/2012   C   1,402,261 A (2) (4) 1,402,261 I By IMC Tube City Investments, LLC (4) Class A Common Stock 05/15/2012   C   701 A (3) (4) 701 I By IMC Tube City Holdings, Inc. (4)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction 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 (Month/Day/Year)

7. Title and Amount of Underlying Securities (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

Class B Common Stock

(1)

05/15/2012

C

49,468

04/19/2011

(5)

Class A Common Stock

49,468

$ 0 (1)

0

D

Class B Common Stock

(2)

05/15/2012

C

1,402,261 (4)

04/19/2011

(5)

Class A Common Stock

1,402,261 (4)

$ 0 (2)

0

I

By IMC Tube City Investments, LLC (4)

Class B Common Stock

(3)

05/15/2012

C

701 (4)

04/19/2011

(5)

Class A Common Stock

701 (4)

$ 0 (3)

0

I

By IMC Tube City Holdings, Inc. (4)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Coslov I Michael C/O TMS INTERNATIONAL CORP. 12 MONONGAHELA AVENUE GLASSPORT, PA 15045		X

Signatures

/s/ Thomas E. Lippard, attorney-in-fact for I Michael Coslov		05/17/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	On May 15, 2012, I Michael Coslov converted 49,468 shares of Class B Common Stock into a like number of shares of Class A Common Stock. Mr. Coslov has not sold or otherwise disposed of the Class A Common Stock acquired as a result of such conversion. Shares of Class B Common Stock are convertible on a one-for-one basis at any time, at the option of the holder, into shares of Class A Common Stock.
(2)	On May 15, 2012, IMC Tube City Investments, LLC converted 1,402,261 shares of Class B Common Stock into a like number of shares of Class A Common Stock. Mr. Coslov has not sold or otherwise disposed of the Class A Common Stock acquired as a result of such conversion. Shares of Class B Common Stock are convertible on a one-for-one basis at any time, at the option of the holder, into shares of Class A Common Stock.
(3)	On May 15, 2012, IMC Tube City Holdings, Inc. converted 701 shares of Class B Common Stock into a like number of shares of Class A Common Stock. Mr. Coslov has not sold or otherwise disposed of the Class A Common Stock acquired as a result of such conversion. Shares of Class B Common Stock are convertible on a one-for-one basis at any time, at the option of the holder, into shares of Class A Common Stock.
(4)	In the Form 4 filed by the reporting person on April 21, 2011 (the "April Form 4"), the holdings of IMC Tube City Investments, LLC and IMC Tube City Holdings, Inc. were inadvertently transposed. The 1,402,261 shares of Class B Common Stock listed in the April Form 4 as being held by IMC Tube City Holdings, Inc. were actually held at such time by IMC Tube City Investments, LLC, and the 701 shares of Class B Common Stock listed in the April Form 4 as being held by IMC Tube City Investments, LLC were actually held at such time by IMC Tube City Holdings, Inc. The share ownership of IMC Tube City Investments, LLC and IMC Tube City Holdings, Inc. are correctly listed in this current Form 4.
(5)	The Class B Common Stock has no expiration date.

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