FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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 *   O'Grady Crevan 2. Date of Event Requiring Statement (Month/Day/Year) 12/14/2010 3. Issuer Name and Ticker or Trading Symbol GAIN Capital Holdings, Inc. [GCAP] (Last) (First) (Middle) SEAGRAM BUILDING, 375 PARK AVENUE SUITE 3001 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) NEW YORK, NY 10152 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
O'Grady Crevan SEAGRAM BUILDING 375 PARK AVENUE SUITE 3001 NEW YORK, NY 10152	  X	Â	Â	Â

Signatures

/s/ Crevan O'Grady		12/14/2010
**Signature of Reporting Person		Date

Explanation of Responses:

No securities are beneficially owned
*	If the form is filed by more than one reporting person, see Instruction 5(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).
  Remarks: Mr. O'Grady is employed by a subsidiary of 3i Group plc, a public limited company whose ordinary shares are listed on the London Stock Exchange ("3i Group"). Mr. O'Grady has de minimis equity ownership of 3i Group resulting from his participation in 3i Group's employee share schemes.  Mr O'Grady also participates in carried interest and bonus schemes that are based in part on the performance of investments made by funds managed by affiliates of 3i Group, including the 3i Funds (defined below).  3i Group is the indirect beneficial owner of all general partnership and limited partnership interests in 3i U.S. Growth Capital (USA) D LP ("Growth Capital D") and 3i U.S. Growth Capital (USA) P LP ("Growth Capital P"). 3i Group is an indirect limited partner in 3i U.S. Growth Capital (USA) E LP ("Growth Capital E"), 3i U.S. Growth Partners LP ("Growth Partners") and 3i U.S. Technology Partners III LP ("Technology Partners" and, together with Growth Capital D, Growth Capital E, Growth Capital P and Growth Partners, the "3i Funds").  The 3i Funds beneficially own shares of the issuer's Series E Preferred Stock (the "Preferred Stock").  Growth Partners and Technology Partners beneficially own a right to receive deferred cash consideration with respect to shares of the Preferred Stock (together with the Preferred Stock, the "Securities"). Investment authority over the shares of Preferred Stock held by the 3i Funds is held by indirect subsidiaries of 3i Group that are general partners of the 3i Funds.  Mr. O'Grady disclaims beneficial ownership of all Securities.

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