144 0001973250 XXXXXXXX LIVE 0001111928 IPG PHOTONICS CORP 001-33155 377 SIMARANO DRIVE MARLBOROUGH MA 01752 5083731100 Valentin Gapontsev Trust II Officer Common Stock Stifel Nicolaus & Company Inc

501 N Broadway St. Louis MO 63102

12876 1519660.00 42443616 06/22/2026 Nasdaq Common Stock 12/17/2010 Gifted Restricted Stock Issuer N 12876 06/22/2026 Cash Y 06/22/2026 03/17/2026 /s/ James Weimer, as a duly authorized representative of STIFEL, as attorney-in-fact for Valentin Gapontsev Trust II