GAIN Capital Opens Singapore Office as Part of Asian Expansion Effort for GAIN GTX, its Institutional ECN

NEW YORK and SINGAPORE, April 5, 2011 - GAIN Capital Holdings, Inc. (NYSE: GCAP), a global provider of online
trading services, today announced that it has opened an office in Singapore
to expand business development efforts in Asia for GAIN GTX, the company's
institutional electronic communications network (ECN).

The GAIN GTX ECN is designed for institutional traders such as banks,
hedge funds, asset managers, CTA's and high frequency trading companies. GAIN
GTX provides a fully anonymous trading environment with advanced algorithmic
trading capabilities, sophisticated order management and routing tools and
access to foreign exchange liquidity through an extensive network of prime
broker relationships. Aside from the ECN, GAIN GTX also offers an aggregation
service of either disclosed or anonymous liquidity via its customizable
prioritization features within the software.

"Since launching in March 2010, GAIN GTX has attracted a diverse client
base due to its superior technology, peer-to-peer trading capabilities, and
the deep liquidity of our prime brokerage partners," commented Vincent
Sangiovanni, chief operating officer of GAIN GTX. "With the second largest
hedge fund industry in Asia, we believe there's a great opportunity for GAIN
GTX in Singapore, and we intend to use the office as a regional hub for our
business."

Mr. Henry Pek will lead the sales effort for GAIN GTX Singapore Pte. Ltd.
and will report to Graham Beale, head of GAIN GTX international sales. A
local Singaporean with nearly twenty years of financial services experience,
Mr. Pek has served in various sales and business development roles in
companies such as CMC Markets, Jardine Fleming Futures and Standard Chartered
Futures.

The office is located at the Straits Trading Building, 9 Battery Road,
#20-02, Singapore. For more information about GAIN GTX and for contact
details, please visit www.gaingtx.com.

About GAIN Capital

GAIN Capital Holdings, Inc. (NYSE: GCAP) is a global provider of online
trading services. GAIN's innovative trading technology provides market access
and highly automated trade execution services across multiple asset classes,
including foreign exchange (forex or FX), contracts for difference (CFDs) and
exchange-based products, to a diverse client base of retail and institutional
investors.

A pioneer in online forex trading, GAIN Capital operates FOREX.com(R),
one of the largest and best-known brands in the retail forex industry. GAIN's
other businesses include GAIN GTX, a fully independent FX ECN for hedge funds
and institutions, and GAIN Securities, Inc. (member FINRA/SIPC) a licensed
U.S. broker-dealer.

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), the National Futures
Association (NFA) and the Securities and Exchange Commission (SEC) in the
United States, the Financial Services Authority (FSA) in the United Kingdom,
the Financial Services Agency (FSA) in Japan, the Securities and Futures
Commission (SFC) in Hong Kong, and the Australian Securities and Investments
Commission (ASIC) in Australia.

For company information, visit www.gaincapital.com.

FOREX.com is a registered trademark of GAIN Capital Holdings. All other
trade names are the property of their respective owners.

In North America and Asia: Christa Conte, +1-212-808-4902, or Savannah Tikotsky, +1-212-808-4903, both of Feintuch Communications, gain at feintuchpr.com; or in Europe: Sorrel Beynon, +44(0)20-3047-2368, or Laura Crooks, +44(0)20-3047-2366, both of Edelman, gain at edelman.com