0001111928-09-000127 8-K 2 20091221 5.02 8.01 9.01 20091221 20091221 IPG PHOTONICS CORP 0001111928 3674 043444218 DE 8-K 34 001-33155 091252493 50 OLD WEBSTER ROAD OXFORD MA 01540 5083731100 50 OLD WEBSTER ROAD OXFORD MA 01540 8-K 1 form8-k.htm IPG PHOTONICS CORPORATION EX-10.1 2 exhibit10-1.htm AMENDMENT TO EMPLOYMENT AGREEMENT