New York – 24th September 2007 - Fidessa group plc (LSE: FDSA) the leading supplier of multi-asset trading, market data and global connectivity, today announced that Capital Institutional Services, Inc. (CAPIS) has selected the Fidessa Trading Platform as its equity trading platform. CAPIS specializes in global agency trading and provides brokerage solutions specifically tailored to the institutional marketplace.

The fully hosted Fidessa trading platform offers CAPIS integrated order management, trading and rich middle-office functionality across their US operations. It replaces CAPIS’s proprietary system, which was one of the first sell-side order management systems to be developed around the FIX protocol.
CAPIS will also use Fidessa’s advanced trading tools that include: Fidessa BlueBox; the fully integrated, scalable algorithmic trading system that offers traders both a suite of industry acknowledged models and a comprehensive framework to design and deploy proprietary algorithms; and Fidessa List Management; capable of transacting large mixed-sided baskets while consolidating all trades and performance data in real time up to the basket level.

“This year we celebrate 30 successful years in the business and have become one of the industry's top institutional agency brokerages,” said Kristi Wetherington, CAPIS President and CEO. “Fidessa’s reliable and scalable trading solution will enable us to continue to grow our business while enhancing our ability to effectively compete in the marketplace. Most importantly, it will help us better serve our client’s trading needs.”

Martin Hakker, EVP of Marketing, comments: “We are very excited to be working with CAPIS to enhance and extend the service they offer their customers. Our unique combination of robust, industrial strength technology coupled with our unrivaled reputation; make us an ideal partner for firms like CAPIS. We look forward to building on our partnership with CAPIS in the future.

Fidessa serves over 16,000 users at around 500 clients around the world, and serves over 85% of global, tier-one equity brokers. Fidessa’s global connectivity network provides links to over 230 brokers, 1,300 buy-sides and 83 exchanges.

- ends -

About Capital Institutional Services, Inc.
CAPIS is a leading U.S. institutional broker specializing in global agency trading and commission management for asset managers and plan sponsors. CAPIS has successfully developed and provided an array of brokerage solutions specifically tailored to the institutional marketplace since 1977. CAPIS is a member of the New York Stock Exchange, the American Stock Exchange, the Financial Industry Regulatory Authority, and the Securities Investor Protection Corporation. For more information, visit www.capis.com.

About Fidessa group
Fidessa group is a world-leading supplier of multi-asset trading, portfolio analysis, decision support, investment compliance, market data and global connectivity solutions for both the buy-side and sell-side globally. Available as a simple workstation or as an integrated application suite, the Fidessa and Fidessa LatentZero product suites are built on the clear vision of providing the richest functionality, coverage and distribution to the financial markets community.

The Fidessa suite is used by 85% of tier-one, global equity brokers providing sophisticated trading, market data, order management and execution capabilities to all tiers of the sell-side.

The Fidessa LatentZero suite is used by the world’s largest asset management firms through to smaller specialist managers and hedge funds, and provides comprehensive portfolio analysis, real-time P&L, what-if analysis, investment compliance, order and execution management, and post trade processing tools, across all asset classes, to all tiers of the buy-side.

Fidessa’s global network carries over 50 million messages a month covering DMA, Care and Algorithmic orders, Indications of Interest and FIX Allocations between over 1,300 buy-sides and 230 brokers across 83 exchanges worldwide.

Head-quartered in London and with offices in New York, Boston, Tokyo, Hong Kong, Paris and Toronto, Fidessa group serves over 16,000 users at around 500 clients globally. Fidessa group was founded in 1981 and acquired LatentZero in 2007. Fidessa group has revenues of $250m, employs over 1,000 people and has been fully listed (LSE:FDSA) since 1997.

www.fidessa.com
www.latentzero.com

For further information, please contact:

Susan Hartzell
CAPIS Media Contact, Integratred Corporate Relations
(203) 682-8238

Martin Hakker
Fidessa
(212) 520-3697
martin.hakker@fidessa.com

Marc Weinstein
Spring O’Brien, for Fidessa
+44 20 3100 3592
marcw@spring-obrien.com

Fidessa® is a registered trademark of Fidessa Group plc
All product and company names herein may be trademarks of their registered owners.