Exhibit 31.2

Certification of Chief Financial Officer

Pursuant to Rule 13a – 14(a) or Rule 15d – 14(a) of the Securities Exchange Act of 1934

I, Timothy P.V. Mammen, certify that:

1. I have reviewed this Amendment No. 1 to the annual report filed on Form 10-K of IPG Photonics Corporation for the year ended December 31, 2023; and

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

Date: April 29, 2024

By:	/s/ Timothy P.V. Mammen
	Timothy P.V. Mammen
	Senior Vice President and Chief Financial Officer (Principal Financial Officer)