Liquidnet Signs OES MarketGroup as Streaming Liquidity Partner

New York, April 13, 2009 – Liquidnet, the global institutional marketplace, today announced that OES MarketGroup has become a Liquidnet Streaming Liquidity Partner (SLP). SLPs contribute to the Liquidnet H2O® liquidity pool, which averaged 10.2 billion shares per day as of March 2009. SLPs also helped Liquidnet’s Supernatural® orders product, which accesses Liquidnet’s H2O and natural liquidity pools, as well as external markets, achieve a 49% percent crossing rate in March 20091.

“Our partnership with OES MarketGroup will enable us to further build our global institutional marketplace,” said Jay Biancamano, Liquidnet Global Head of Marketplace. “When you can offer the buy side a single venue which completes approximately half of its executions in that venue, without the need to expose orders to the public market, you have essentially created a value proposition that is unsurpassed in today’s markets. As a result, our SLPs are able to interact with liquidity that cannot be found on the open market.”

“We are delighted to enter into this partnership with Liquidnet to interact with our growing network of exchange and broker-dealer liquidity approaching two billion shares of actionable order flow per day2," said Mike Barth, OES MarketGroup EVP. “Our partnership demonstrates our commitment to aggregating complementary liquidity to provide our clients with the maximum level of liquidity and quality execution.”

Based in part on the participation of SLPs, Supernatural orders increased 181% to 26.6 million shares from 9.5 million shares (Mar’09 v Mar ’08) and accounted for 42% of total trading volume in March 2009, versus 14% in March 2008. Supernatural trading strategies are designed to execute block-sized trades with natural matches when available, and react quickly to absorb liquidity from other sources.

About Liquidnet H2O

Launched in September 2005, Liquidnet H2O aggregates fragmented market liquidity and enables Liquidnet members to interact with liquidity in a controlled and secure environment against SLPs consisting of leading broker-dealers and exchanges. Liquidnet H2O provides price improvement to both the buyer and seller by executing all trades at the midpoint of the highest displayed bid and lowest displayed offer in the national market, or NBBO.

About OES MarketGroup

Order Execution Services Holdings, Inc. (OES, www.tradeoes.com), through its wholly-owned technology and broker-dealer subsidiaries, provides seamless electronic market connectivity, liquidity access and rapid executions by linking broker-dealers, trading systems, exchanges and market centers. As an innovative securities industry leader, OES specializes in direct market access and smart order routing, Reg NMS and MiFID compliance tools, sponsored market access, agency execution and private inter-market linkages. Closely-held, OES is headquartered in Newark, N.J., with offices in Princeton, Los Angeles, and Luxembourg.

About Liquidnet

Liquidnet is the world’s institutional marketplace that facilitates institutional equities trading for institutional investors worldwide. By giving buy-side traders a first look at a global natural liquidity pool of more than 9.2 billion shares ($67.9 billion in principal) per day of liquidity on average, Liquidnet consolidates and delivers the institutional equities market directly to the desktops of more than 573 buy-side trading firms (for the quarter ended December 31, 2008.) Institutional investors use the Liquidnet marketplace to enhance the quality and speed of trade execution, gain price improvement for their trades, and, ultimately, lower overall trading costs. Launched in 2001, Liquidnet now trades in 29 equity markets across five continents. Liquidnet is headquartered in New York with offices in London, Toronto, Tokyo, Hong Kong, Sydney and Singapore. Additional company information is available online at www.liquidnet.com.