X0202 3 2006-03-08 0 0001290096 Eagle Test Systems, Inc. EGLT 0001235813 TA ASSOCIATES AP IV LP C/O TA ASSOCIATES, INC. 125 HIGH STREET BOSTON MA 02110 0 0 1 0 Series A Convertible Preferred Stock 2006-03-08 Common Stock 1828665 I See Footnote 3 These securities are preferred stock of the Issuer and do not have an expiration date. The shares of Series A Convertible Preferred Stock will convert at a rate of 1-to-2,500 into the number of shares of Common Stock shown in column 3 above. The reporting person may be deemed to have an indirect pecuniary interest as the General Partner of TA/Atlantic and Pacific IV L.P. The reporting person disclaims beneficial ownership of such shares because the reporting person's indirect pecuniary interest is subject to indeterminable future events. TA Associates AP IV L.P. By: TA Associates, Inc., its General Partner By: Thomas P. Alber, Chief Financial Officer /s/ Thomas P. Alber 2006-03-08