X0202 4 2007-11-23 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 2007-11-23 4 S 0 6666 19.50 D 11739343 D Common Stock 2007-11-23 4 S 0 7400 19.52 D 8110602 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-11-26 4 S 0 20000 19.97 D 11719343 D Common Stock 2007-11-26 4 S 0 35600 19.96 D 8075002 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 by the reporting person on August 23, 2007. Sales ranged from 19.36 to $19.90 as follows: 100 shares at $19.36; 100 shares at $19.38; 430 shares at $19.40; 270 shares at $19.41; 300 shares at $19.42; 500 shares at $19.44; 700 shares at $19.45; 600 shares at $19.46; 100 shares at $19.47; 500 shares at $19.48; 100 shares at $19.49; 500 shares at $19.50; 366 shares at $19.51; 600 shares at $19.52; 200 shares at $19.53; 200 shares at $19.54; 600 shares at $19.55; 100 shares at $19.58; 100 shares at $19.66; 100 shares at $19.81; 100 shares at $19.88; and 100 shares at $19.90. Sales ranged from $19.40 and $19.88 as follows: 400 shares at $19.40; 361 shares at $19.42; 100 shares at $19.43; 500 shares at $19.44; 761 shares at $19.45; 478 shares at $19.46; 100 shares at $19.47; 400 shares at $19.48; 100 shares at $19.49; 700 shares at $19.50; 300 shares at $19.51; 500 shares at $19.52; 200 shares at $19.53; 200 shares at $19.54; 1,000 shares at $19.55; 100 shares at $19.56; 300 shares at $19.59; 400 shares at $19.60; 100 shares at $19.66; 100 shares at $19.72; and 300 shares at $19.88. Sales ranged from $19.78 to $20.01 as follows: 100 shares at $19.78; 400 shares at $19.81; 300 shares at $19.81; 600 shares at $19.83; 404 shares at $19.87; 296 shares at $19.88; 500 shares at $19.89; 600 shares at $19.90; 400 shares at $19.92; 200 shares at $19.93; 200 shares at $19.94; 500 shares at $19.95; 100 shares at $19.96; 1,312 shares at $19.97; 400 shares at $19.98; 1,197 shares at $19.99; 10,803 shares at $20.00; and 1,688 shares at $20.01. Sales ranged from $19.71 to $20.04 as follows: 100 shares at $19.71; 700 shares at $19.81; 700 shares at $19.81; 526 shares at $19.83; 500 shares at $19.84; 100 shares at $19.84; 1,200 shares at $19.86; 1,020 shares at $19.87; 304 shares at $19.88; 1,176 shares at $19.90; 74 shares at $19.91; 1,500 shares at $19.93; 1,785 shares at $19.94; 1,842 shares at $19.95; 609 shares at $19.96; 4,330 shares at $19.97; 1,241 shares at $19.98; 2,140 shares at $19.99; 13,490 shares at $20.00; 1,648 shares at $20.01; 515 shares at $20.02; and 100 shares at $20.04. 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 2007-11-27