X0202 4 2007-10-11 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 2007-10-11 4 S 0 4500 20.00 D 11773925 D Common Stock 2007-10-11 4 S 0 100 20.01 D 11773825 D Common Stock 2007-10-11 4 S 0 50 20.03 D 11773775 D Common Stock 2007-10-11 4 S 0 450 20.05 D 11773325 D Common Stock 2007-10-11 4 S 0 350 20.06 D 11772975 D Common Stock 2007-10-11 4 S 0 150 20.08 D 11772825 D Common Stock 2007-10-11 4 S 0 150 20.09 D 11772675 D Common Stock 2007-10-11 4 S 0 4500 20.00 D 8166352 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-10-11 4 S 0 100 20.01 D 8166252 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-10-11 4 S 0 50 20.03 D 8166202 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-10-11 4 S 0 450 20.05 D 8165752 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-10-11 4 S 0 350 20.06 D 8165402 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-10-11 4 S 0 150 20.08 D 8165252 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-10-11 4 S 0 150 20.09 D 8165102 I Through IP Fibre Devices (UK) Ltd. Common Stock 2007-10-12 4 S 0 4100 20.00 D 11768575 D Common Stock 2007-10-12 4 S 0 4100 20.00 D 8161002 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. 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 2007-10-15