This excerpt taken from the NDAQ 8-K filed Apr 15, 2008.
What are the pricing changes?
Effective May 1, 2008, pending filing with the Securities and Exchange Commission (SEC), NASDAQ® plans to introduce pricing changes for all U.S. equities. The new unified pricing for Tape A, Tape B and Tape C securities will be as follows:
The rebate for non-display orders will be $0.0015 for adding greater than 35 million shares and $0.0010 for adding 35 millions shares or less.
NASDAQ plans to discontinue the liquidity provider credit program for select Tape B securities. The rebates above will apply for all securities traded on Tape B. The Data Revenue Share Plan will be at 50% for all Tape B securities.