The Nasdaq Stock Market Inc. announced that it continued to capture a greater percentage of market share and share volume in NYSE-listed securities in June.

During June 2006, Nasdaq’s average daily share volume in NYSE-listed securities was approximately 594.6 million, compared with 566.5 million in May and 315.3 million in June 2005, it said.

Nasdaq’s total market share in NYSE-listed securities in June was 23%. Included in the total market share figure for June is 14.1% in NYSE-listed securities executed by broker-dealers and reported to Nasdaq.

Nasdaq’s total market share in Nasdaq-listed securities in June was 77.9%. Included in the total market share figure for June is 29% in Nasdaq securities executed by broker-dealers and reported to Nasdaq.

Total market share in listings represents the total share volume of listed securities that are executed on the Nasdaq Market Center, INET and/or Brut books, plus internalized volume, as a percentage of total consolidated market volume. Shares routed to other market centers for execution are not included.

Nasdaq also noted that on June 30, the Securities and Exchange Commission approved its phased approach to exchange operation. Nasdaq plans to become operational as an exchange in Nasdaq-listed issues on August 1, and in other exchange-listed issues on or after September 1.

Additionally, Nasdaq plans to begin the migration of the Nasdaq, Brut and INET systems into Single Book in Nasdaq-listed issues on a security-by-security phase-in in August. Single Book integration in NYSE-, Amex- and regional-listed securities will occur following the completion of the Single Book integration of Nasdaq-listed securities.