Nasdaq to Cancel Some Trades in Knight Trading Group

New York, N.Y.—- The Nasdaq Stock Market, Inc. (Nasdaq®) today announced that it is canceling all trades in Knight Trading Group (Nasdaq:NITE) that were executed from 8:23:00 a.m. ET to 8:48:44 a.m. ET. This is consistent with actions taken by other exchanges.

Nasdaq's action is due to a system operation problem at Knight Trading Group. To access Knight Trading Group's entire statement regarding the problem, please go to
http://www.knight-sec.com/.