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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(Print or Type Responses)

1. Name and Address of Reporting Person * GGC Opportunity Fund Management GP, Ltd.   2. Issuer Name and Ticker or Trading Symbol U.S. SILICA HOLDINGS, INC. [SLCA] 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 GOLDEN GATE PRIVATE EQUITY, INC., ONE EMBARCADERO CENTER, 39TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 03/19/2013 (Street) SAN FRANCISCO, CA 94111 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 Common Stock, par value $0.01 03/19/2013   S   9,775,000 D $ 21.12 31,401,471 I See footnotes (1) (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
GGC Opportunity Fund Management GP, Ltd. C/O GOLDEN GATE PRIVATE EQUITY, INC. ONE EMBARCADERO CENTER, 39TH FLOOR SAN FRANCISCO, CA 94111		X
GGC Opportunity Fund Management, L.P. C/O GOLDEN GATE PRIVATE EQUITY, INC. ONE EMBARCADERO CENTER, 39TH FLOOR SAN FRANCISCO, CA 94111		X
GGCOF Co-Invest Management, L.P. C/O GOLDEN GATE PRIVATE EQUITY, INC. ONE EMBARCADERO CENTER, 39TH FLOOR SAN FRANCISCO, CA 94111		X
GOLDEN GATE CAPITAL OPPORTUNITY FUND, L.P. C/O GOLDEN GATE PRIVATE EQUITY, INC. ONE EMBARCADERO CENTER, 39TH FLOOR SAN FRANCISCO, CA 94111		X
GOLDEN GATE CAPITAL OPPORTUNITY FUND-A, L.P. C/O GOLDEN GATE PRIVATE EQUITY, INC. ONE EMBARCADERO CENTER, 39TH FLOOR SAN FRANCISCO, CA 94111		X
GGCOF THIRD-PARTY CO-INVEST, L.P. C/O GOLDEN GATE PRIVATE EQUITY, INC. ONE EMBARCADERO CENTER, 39TH FLOOR SAN FRANCISCO, CA 94111		X
GGCOF CO-INVEST, L.P. C/O GOLDEN GATE PRIVATE EQUITY, INC. ONE EMBARCADERO CENTER, 39TH FLOOR SAN FRANCISCO, CA 94111		X

Signatures

/s/ Robert M. Hayward, P.C. by Power of Attorney		03/21/2013
**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)	GGC USS Holdings, LLC ("Holdings") is the direct beneficial owner of 31,401,471 shares of common stock of U.S. Silica Holdings, Inc. The shares beneficially owned directly by Holdings are beneficially owned indirectly by (a) Golden Gate Capital Opportunity Fund, L.P., (b) Golden Gate Capital Opportunity Fund-A, L.P., (c) GGCOF Third-Party Co-Invest, L.P. and (d) GGCOF Co-Invest, L.P. The shares indirectly held by the funds listed in clauses (a) through (c) are beneficially owned indirectly by their general partner, GGC Opportunity Fund Management, L.P. ("Management GP"), and the general partner of Management GP, GGC Opportunity Fund Management GP, Ltd. ("Ultimate GP"). (Continue in footnote 2)
(2)	The shares indirectly held by the fund listed in clause (d) are beneficially owned indirectly by its general partner, GGCOF Co-Invest Management, L.P. ("GGCOF Management"), the general partner of GGCOF Management, Management GP, and the general partner of Management GP, Ultimate GP. Ultimate GP has voting and dispositive authority over the shares held by Holdings and is governed by its board of directors.

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