X0202 4 2005-08-02 1 0001091158 WEBSIDESTORY INC WSSI 0001258824 SUMMIT PARTNERS LLC 222 BERKELEY STREET 18TH FLOOR BOSTON MA 02116 0 0 0 1 Indirect GP of 10% Owner 0001239366 CHUNG PETER Y C/O SUMMIT PARTNERS 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 0 1 Indirect GP of 10% Owner 0001255670 COLLINS SCOTT C C/O SUMMIT PARTNERS 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 0 1 Indirect GP of 10% Owner 0001255672 MOHAN KEVIN P C/O SUMMIT PARTNERS 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 0 1 Indirect GP of 10% Owner 0001258823 SUMMIT PARTNERS V LP 222 BERKELEY STREET 18TH FLOOR BOSTON MA 02116 0 0 0 1 GP of 10% Owner Common Stock 2005-08-02 4 J 0 1000000 D 1139794 I Indirect GP of 10% Owner Common Stock 2005-08-02 4 J 0 35345 A 35345 I Indirect GP of 10% Owner Common Stock 2005-08-02 4 G 0 35345 D 0 I Held by Trust Pro-rata distribution to Partners. 741,657 shares held in the name of Summit Ventures, V, L.P.; 172,652 shares held in the name of Summit V Companion Fund, L.P.; 16,010 shares held in the name of Summit V Advisors Fund, L.P.; 52,393 shares held in the name of Summit V Advisors Fund (QP), L.P.; and 17,288 shares held in the name of Summit Investors III, L.P. Not applicable. 845,337 shares held in the name of Summit Ventures, V, L.P.; 196,788 shares held in the name of Summit V Companion Fund, L.P.; 18,248 shares held in the name of Summit V Advisors Fund, L.P.; 59,717 shares held in the name of Summit V Advisors Fund (QP), L.P.; and 19,704 shares held in the name of Summit Investors III, L.P. Each reporting person, other than Summit Partners, LLC and Summit Partners V, L.P., is a member of Summit Partners, LLC, which is the general partner of Summit Partners V, L.P., which, in turn, is the general partner of each of the entities named in Footnotes 2 & 3 above. As such, each reporting person may be deemed to beneficially own the shares of the Issuer owned directly by each of the Funds. The reporting persons disclaim beneficial ownership of such shares, and this report shall not be deemed an admission that the reporting persons are the beneficial owners of the securities for the purpose of Section 16 or for any other purpose, except to the extent of their pecuniary interest therein. Summit Partners, LLC, by Robin W. Devereux, Power of Attorney for Martin J. Mannion, Member 2005-08-02 Robin W. Devereux, Power of Attorney for Peter Y. Chung 2005-08-02 Robin W. Devereux, Power of Attorney for Scott C. Collins 2005-08-02 Robin W. Devereux, Power of Attorney for Kevin P. Mohan 2005-08-02 Summit Partners V, L.P. by Summit Partners, LLC, Its General Partner, by Robin W. Devereux, Power of Attorney for Martin J. Mannion, Member 2005-08-02