X0202 4 2007-12-24 0001111928 IPG PHOTONICS CORP IPGP 0001130421 GAPONTSEV VALENTIN P C/O IPG PHOTONICS CORPORATION 50 OLD WEBSTER ROAD OXFORD MA 01540 1 1 1 0 CEO & Chairman of the Board Common Stock 2007-12-24 2007-12-27 4 S 0 20002 20.22 D 11699341 D Common Stock 2007-12-24 2007-12-27 4 S 0 23000 20.22 D 8052002 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-12-26 2007-12-27 4 S 0 20000 20.25 D 8032002 I Through IP Fibre Devices (UK) Ltd. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on August 23, 2007. Sales ranged from $20.03 to $20.69 as follows: 200 shares at $20.03; 900 shares at $20.06; 300 shares at $20.10; 500 shares at $20.12; 1,200 shares at $20.15; 788 shares at $20.16; 534 shares at $20.17; 900 shares at $20.18; 2,030 shares at $20.19; 766 shares at $20.20; 1,282 shares at $20.21; 400 shares at $20.22; 5,600 shares at $20.22; 302 shares at $20.23; 300 shares at $20.24; 298 shares at $20.25; 100 shares at $20.26; 2 shares at $20.30; 1,266 shares at $20.31; 200 shares at $20.32; 234 shares at $20.33; 100 shares at $20.34; 800 shares at $20.37; 788 shares at $20.38; 100 shares at $20.41; 12 shares at $20.43; and 100 shares at $20.69. Sales ranged from $20.02 to $20.69 as follows: 100 shares at $20.02; 100 shares at $20.03; 800 shares at $20.06; 100 shares at $20.09; 200 shares at $20.10; 700 shares at $20.12; 916 shares at $20.15; 2,250 shares at $20.16; 569 shares at $20.17; 1,200 shares at $20.18; 2,582 shares at $20.19; 1,288 shares at $20.20; 200 shares at $20.21; 618 shares at $20.21; 200 shares at $20.22; 5,012 shares at $20.22; 507 shares at $20.23; 500 shares at $20.24; 158 shares at $20.25; 100 shares at $20.30; 800 shares at $20.31; 900 shares at $20.33; 200 shares at $20.34; 100 shares at $20.35; 1,300 shares at $20.37; 1,200 shares at $20.38; 100 shares at $20.41; 200 shares at $20.43; and 100 shares at $20.69. Sales ranged from $19.95 to $20.43 as follows: 100 shares at $19.95; 200 shares at $20.14; 100 shares at $20.15; 200 shares at $20.15; 500 shares at $20.16; 2100 shares at $20.16; 100 shares at $20.17; 1490 shares at $20.18; 200 shares at $20.19; 710 shares at $20.19; 200 shares at $20.20; 1900 shares at $20.20; 100 shares at $20.21; 300 shares at $20.21; 100 shares at $20.22; 100 shares at $20.23; 500 shares at $20.24; 1100 shares at $20.25; 400 shares at $20.26; 100 shares at $20.27; 400 shares at $20.27; 700 shares at $20.28; 1100 shares at $20.29; 1800 shares at 20.30; 1100 shares at $20.31; 500 shares at $20.32; 800 shares at $20.33; 500 shares at $20.34; 1100 shares at $20.35; 100 shares at $20.36; 100 shares at $20.37; 1100 shares at $20.38; 100 shares at $20.41; and 100 shares at $20.43. The reporting person is the managing director of IP Fibre Devices (UK) Ltd. and has voting and investment power with respect to the shares held of record by IP Fibre Devices (UK) Ltd. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of the beneficial ownership of all the reported shares for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. Angelo P. Lopresti, Attorney-at-law 2007-12-28