X0202 4 2006-07-17 0 0001333513 DealerTrack Holdings, Inc. TRAK 0001342284 Trinder David C/O DEALERTRACK HOLDINGS, INC. 1111 MARCUS AVENUE, SUITE M04 LAKE SUCCESS NY 11042 0 1 0 0 * please see below Common Stock 2006-07-17 4 S 0 1500 21.70 D 27166 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2005. Includes 12,750 shares of restricted common stock. * Mr. Trinder is President of DealerTrack Aftermarket Services, Inc. /s/ Eric D. Jacobs as attorney-in-fact for David Trinder 2006-07-18