Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Samartsev Igor 2. Issuer Name and Ticker or Trading Symbol IPG PHOTONICS CORP [IPGP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP, Chief Scientist (Last) (First) (Middle) C/O IPG PHOTONICS CORPORATION, 377 SIMARANO DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 03/09/2026 (Street) MARLBOROUGH, MA 01752 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 5,080(1) D(2) Common Stock 113,265 I By Wife Common Stock 10,000 I By Wife's Mother Common Stock 1,200 I By Trust 2015 Common Stock 176,400 I By Trust Sept. 2015 Common Stock 20,983 I By Trust-G4 2016 Common Stock 20,982 I By Trust-I 2016 Common Stock 122,660(3) I By Trust May 2017 Common Stock 241,341(1) I By Trust-I May 2017 Common Stock 0 (3) I By Grantor Retained Annuity Trust November 2022 Common Stock 122,225 I By Grantor Retained Annuity Trust I September 2025 Common Stock 121,951 I By Grantor Retained Annuity Trust II September 2025

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Samartsev Igor C/O IPG PHOTONICS CORPORATION 377 SIMARANO DRIVE MARLBOROUGH, MA 01752			SVP, Chief Scientist
Pavlova Natalia C/O IPG PHOTONICS CORPORATION 377 SIMARANO DRIVE MARLBOROUGH, MA 01752	X

Signatures

/s/ Adam N. King, Attorney-in-Fact for Natalia Pavlova and Igor Samartsev		03/09/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This amount reflects 5,369 shares received by Trust-I May 2017 from the Reporting Person.
(2)	Ms. Pavlova, a director, is an indirect beneficial owner of such shares as the spouse of Dr. Samartsev, an officer.
(3)	On March 9, 2026, Grantor Retained Annuity Trust November 2022 made an annuity payment-in-kind of 28,908 shares to Trust May 2017.

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