Company: IPGP
Filing Date: 2025-05-21
Form Type: S-8
Source: 0001111928-25-000075
Chunk: 2

Company: IPG PHOTONICS CORP
Filing Date: 2025-05-21
Form: S-8
Chunk 2
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 for issuance under the ESPP pursuant to the currently effective Registration Statement on Form S-8 (Registration No. 333-223545) filed on March 18, 2018 (the “ESPP Registration Statement”). Pursuant to General Instruction E of Form S-8, and only with respect to the ESPP Shares, the contents of ESPP Registration Statement, including any amendments thereto or filings incorporated therein, are incorporated herein by this reference to the extent not replaced hereby.

# PART I
<div align='center'>INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</div>

The documents containing the information required by Part I of this Registration Statement on Form S-8 (this “Registration Statement”) will be sent or given to employees as specified by Rule 428(b)(1) of the Securities Act of 1933, as amended (the “Securities Act”). Such documents are not required to be (and are not) filed with the Securities and Exchange Commission (the “Commission”) either as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424. These documents and the documents incorporated by reference into this Registration Statement pursuant to Item 3 of Part II of this Registration Statement, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the Securities Act.

# PART II

### INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

## Item 3. Incorporation of Documents by Reference.
The following documents filed by the Registrant with the Commission are incorporated by reference in this Registration Statement:

(a) The Registrant’s annual report on Form 10-K for the fiscal year ended December 31, 2024, filed with the Commission on February 20, 2025, pursuant to Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”);

(b) The Registrant’s quarterly report on Form 10-Q for the fiscal quarter ended March 31, 2025, filed with the Commission on May 6, 2025 ;

(c) The Registrant’s current reports on Form 8-K filed with the Commission on February 11 , 202 5 , March 7 , 202 5 , and April 11, 2025 ;

(d) All other reports filed by the Registrant pursuant to Section 13(a) or 15(d) of the Exchange Act since the end of the fiscal year covered by the Registrant’s annual report on Form