Instinet Group Announces Special Shareholders Meeting

Instinet Group Incorporated (Nasdaq-INGP) ("Instinet Group") today announced that its Board of Directors has determined that a special meeting of stockholders for the primary purpose to adopt the merger agreement between Instinet Group, Incorporated and The Nasdaq Stock Market, Inc. will be held on September 21, 2005 at 2:00 p.m. EST at Instinet Group's corporate offices located at Three Times Square, New York, NY. The record date for the special meeting will be August 26, 2005. Only stockholders who hold Instinet Group shares as of the close of business on that day will be entitled to attend and vote at the special meeting.

About Instinet Group

Instinet Group, through affiliates, is the largest global electronic agency securities broker and has been providing investors with electronic trading solutions and execution services for more than 30 years. We operate our two major businesses through Instinet, LLC, The Institutional Broker, and Inet ATS, Inc., The electronic marketplace.

Instinet, The Institutional Broker, gives its customers the opportunity to use its sales-trading expertise and advanced technology tools to interact with global securities markets, improve trading performance and lower overall transaction costs. Through Instinet's electronic platforms, customers can access other U.S. trading venues, including NASDAQ and the NYSE, and almost 30 securities markets throughout the world. Instinet acts solely as an agent for its customers, including institutional investors, such as mutual funds, pension funds, insurance companies and hedge funds

INET, The electronic marketplace, represents the consolidation of the order flow of the former Instinet ECN and former Island ECN, providing its U.S. broker-dealer customers one of the largest liquidity pools in NASDAQ-listed securities.