IPG Photonics(IPGP) - 2018 Q4 - Annual Report

OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-33155 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K (Mark One) þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 IPG PHOTONICS CORPORATION (Exact name of registrant as specified in its charter) Delaware 04-3444218 (State or other jurisdiction of incorporati ...