X0202 4 2007-07-16 0 0001111928 IPG PHOTONICS CORP IPGP 0001235813 TA ASSOCIATES AP IV LP JOHN HANCOCK TOWER 200 CLARENDON ST. 56TH FLOOR BOSTON MA 02116 1 0 0 0 See General Remarks Common Stock 2007-07-16 4 S 0 11895 20.0272 D 747566 I See Footnote 1 Common Stock 2007-07-17 4 S 0 9416 20.2743 D 738150 I See Footnote 1 Common Stock 2007-07-18 4 S 0 8555 20.0660 D 729595 I See Footnote 1 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. The Reporting Person has a representative on the Issuer's board of directors. Michael Child currently serves as the Reporting Person's representative on the board of directors and the Reporting Person is deemed a director of the Issuer by deputization. TA Associates AP IV L.P. 2007-07-18 By: TA Associates, Inc., its General Partner 2007-07-18 By: Thomas P. Alber, Chief Financial Officer 2007-07-18