144 0001508155 XXXXXXXX LIVE 0001111928 IPG PHOTONICS CORP 001-33155 377 SIMARANO DRIVE MARLBOROUGH MA 01752 5083731100 Valentin Gapontsev Trust I Affiliate Common Stifel Investments

501 N Broadway St Louis MO 63102

49500 5363820.00 47305582 09/08/2023 NASDAQ Common 12/17/2010 Gifted Restricted Stock issuer N 49500 09/08/2023 Cash N Valentin Gapontsev Trust I U/A DTD 12/17/2010

377 Simarano Drive Marlborough MO 01752

Common 06/06/2023 8250 926484.00 Valentin Gapontsev Trust I U/A DTD 12/17/2010

377 Simarano Drive, Marlborough MA 01752

Common 06/26/2023 8250 1083748.00 Valentin Gapontsev Trust I U/A DTD 12/17/2010

377 Simarano Drive Marlborough, MA 01752

Common 07/10/2023 8250 1103805.00 Valentin Gapontsev Trust I U/A DTD 12/17/2010

377 Simarano Drive Marlborough MA 01752

Common 07/24/2023 8250 1076417.00 Valentin Gapontsev Trust I U/A DTD 12/17/2010

377 Simarano Drive Marlborough, MA 01752

Common 08/08/2023 8250 905381.00 alentin Gapontsev Trust I U/A DTD 12/17/2010

377 Simarano Drive Marlborough MA 01752

Common 08/24/2023 8250 846635.00 09/01/2023 12/15/2022 Valentin Gapontsev Trust I