X0202 4 2007-03-06 0 0001333513 DealerTrack Holdings, Inc. TRAK 0001342335 Cox Robert J III C/O DEALERTRACK HOLDINGS, INC. 1111 MARCUS AVENUE, SUITE M04 LAKE SUCCESS NY 11042 0 1 0 0 SVP, CFO and Treasurer Deferred Stock Units 2007-03-06 4 A 0 1309.52 30.24 A Common Stock 1309.52 1309.52 D These are Deferred Stock Units acquired under the DealerTrack Holdings, Inc. Employees' Deferred Compensation Plan through deferral of all or part of the Reporting Person's 2006 bonus. Each Deferred Stock Unit is the economic equivalent of one share of DealerTrack Holdings, Inc. Common Stock. Deferred Stock Units are converted into DealerTrack Holdings, Inc. Common Stock and distributed upon the payment commencement date selected by the Reporting Person. /s/ Eric D. Jacobs as attorney-in-fact for Robert J. Cox III 2007-03-22