GAIN Capital 10-Q 2017 Q2 Quarterly report

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER,

AS REQUIRED BY SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Glenn H. Stevens, the undersigned Chief Executive Officer and President of GAIN Capital Holdings, Inc., a Delaware corporation (the “Company”) hereby certify pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 that to my knowledge:

1. The accompanying quarterly report on Form 10-Q for the fiscal quarter ended June 30, 2017 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 8, 2017	/s/ Glenn H. Stevens
	Glenn H. Stevens
	Chief Executive Officer and President
	(Principal Executive Officer)

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate disclosure document.

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.