GAIN Capital Acquires MG Financial's Retail Forex Business

NEW YORK and LONDON, September 13, 2010 - GAIN Capital Holdings, Inc., a global provider of online trading services
specializing in foreign exchange (forex or FX) and contracts for difference
(CFDs), has reached an agreement to acquire certain assets of MG Financial
LLC's U.S. operations. Under the agreement, MG Financial will transfer
approximately 4,000 customers to FOREX.com, the retail division of GAIN
Capital.

MG Financial has been offering online trading services since 1997. The
announcement comes as a result of MG Financial's decision to exit the retail
forex industry and cease operations. MG Financial's management team intends
to pursue other business opportunities in the financial services industry,
but no formal plans have been announced.

"MG Financial is one of the oldest and most recognized names in the
retail forex industry and has built a solid reputation by providing excellent
service to its customers," said Glenn Stevens, CEO, GAIN Capital. "We will
work closely with MG's team to ensure a smooth transition for their
customers, who will now have access to the robust offering available at
FOREX.com, including our expanded product suite, competitive dealing spreads,
and comprehensive suite of trading tools, research and educational
resources."

MG Financial's customers were notified of the option to transfer their
accounts to FOREX.com on September 1, 2010. The transfer is scheduled to be
completed on or about September 13, 2010.

About GAIN Capital

GAIN Capital Holdings, Inc. is a global provider of online trading
services, specializing in foreign exchange (forex or FX) and contracts for
difference (CFDs). Customers and trading partners in more than 140 countries
have utilized the company's award-winning trading platform which transacts
nearly US$250 billion per month.

A pioneer in online forex trading, GAIN Capital provides execution,
clearing, custody and technology products and services to an institutional
client base including asset managers, broker/dealers and other financial
services firms. GAIN also operates FOREX.com, one of the largest and
best-known brands in the retail forex industry.

With offices in New York City; Bedminster, New Jersey; London; Sydney;
Hong Kong; Tokyo and Seoul. GAIN Capital and its affiliates are regulated by
the Commodity Futures Trading Commission (CFTC) in the United States, the
Financial Services Authority (FSA) in the United Kingdom, the Financial
Services Authority (FSA) in Japan, the Securities and Futures Commission
(SFC) in Hong Kong, and the Australian Securities and Investments Commission
(ASIC) in Australia.

GAIN's investor group includes private equity firms 3i, VantagePoint
Venture Partners, Tudor Ventures, Edison Venture Fund and Cross Atlantic
Capital Partners.

For company information, visit www.gaincapital.com or
www.forex.com.

All trade names are the property of their respective owners.

In UK & Europe: Sorrel Beynon, +44-(0)-20-3047-2368, or Laura Cocker, +44-(0)-20-3047-2365, both of Edelman, gain at edelman.com; or In North America: Christa Conte, +1-212-808-4902, or Savannah Tikotsky, +1-212-808-4903, both of Feintuch Communications, gain at feintuchpr.com