X0303 4 2011-01-25 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 2011-01-25 4 G 0 100000 0 D 2952931 D Common Stock 2011-01-25 4 S 0 900000 29.20 D 2052931 D Shares gifted by the Reporting Person to The Valentin Gapontsev Trust II, an irrevocable trust established by the Reporting Person on December 17, 2010. The transaction was done for estate planning purposes. Shares sold by the Reporting Person to The Valentin Gapontsev Trust II, an irrevocable trust established by the Reporting Person on December 17, 2010. The transaction was done for estate planning purposes. Angelo P. Lopresti, Attorney-in-fact 2011-01-27