0001111928-09-000018 4 1 20090226 20090302 20090302 Shcherbakov Eugene A 0001378544 4 34 001-33155 09647555 508-373-1100 IPG PHOTONICS CORPORATION 50 OLD WEBSTER ROAD OXFORD MA 01540 IPG PHOTONICS CORP 0001111928 3674 043444218 DE 50 OLD WEBSTER ROAD OXFORD MA 01540 5083731100 50 OLD WEBSTER ROAD OXFORD MA 01540 4 1 edgar.xml PRIMARY DOCUMENT