X0202 4 2005-12-16 0 0001333513 DealerTrack Holdings, Inc. TRAK 0001342884 Blair John Allen C/O DEALERTRACK HOLDINGS, INC. 1111 MARCUS AVENUE, SUITE M04 LAKE SUCCESS NY 11042 0 1 0 0 * Please see below Common Stock 2005-12-16 4 C 0 979919 A 979919 I By DJR US, LLC Common Stock 2005-12-16 4 C 0 316749 A 1296668 I By DJR US, LLC Common Stock 2005-12-16 4 S 0 289046 15.81 D 1007622 I By DJR US, LLC Common Stock 2005-12-16 4 P 0 150 17.00 A 59086 D Convertible Series A-1 Participating Preferred Stock 2005-12-16 4 C 0 624630 D Common Stock 979919 0 I By DJR US, LLC Convertible Series C Preferred Stock 2005-12-16 4 C 0 270587 D Common Stock 316749 0 I By DJR US, LLC Shares of Convertible Series A-1 Participating Preferred Stock were automatically converted into shares of common stock on a 1-to-1.5688 basis upon the closing of the Issuer's initial public offering on December 16, 2005. Excludes 58,936 shares of common stock held directly by Mr. Blair, as initially disclosed on Mr. Blair's Form 3. Douglas W. Aiken is a Manager and Member of, and John A. Blair and Raj Sundaram are Members of, DJR US, LLC (formerly known as Automotive Lease Guide (alg), LLC), and, as such, exercise voting and/or dispositive powers over the shares held by DJR US, LLC. Each of Messrs. Aiken, Blair and Sundaram disclaims beneficial ownership of all of the shares held by DJR US, LLC except to the extent of his pecuniary interest therein. Shares of Convertible Series C Preferred Stock were automatically converted into shares of common stock on a 1-to-1.1706 basis upon the closing of the Issuer's initial public offering on December 16, 2005. * Mr. Blair is the President of DealerTrack Data Services, Inc. /s/ Eric D. Jacobs as attorney-in-fact for John Allen Blair 2005-12-20