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

1. Name and Address of Reporting Person ^* Mammen Timothy PV	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 Financial Officer
(Last) (First) (Middle) C/O IPG PHOTONICS CORPORATION, 50 OLD WEBSTER ROAD	3. Date of Earliest Transaction (MM/DD/YYYY) 11/10/2020
(Street) OXFORD, MA 01540 (City) (State) (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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)
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	11/10/2020		M		7500	A	$60.11	51469	D
Common Stock	11/10/2020		M		7592	A	$81.89	59061	D
Common Stock	11/10/2020		S		5110	D	$204.39 ⁽¹⁾	53951	D
Common Stock	11/10/2020		S		2836	D	$205.17 ⁽²⁾	51115	D
Common Stock	11/10/2020		S		1364	D	$206.71 ⁽³⁾	49751	D
Common Stock	11/10/2020		S		4902	D	$208.13 ⁽⁴⁾	44849	D
Common Stock	11/10/2020		S		880	D	$208.63 ⁽⁵⁾	43969	D

*Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)*
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)			11. Nature of Indirect Beneficial Ownership (Instr. 4)
Employee Stock Option (right to buy)	$60.11	11/10/2020		M			7500	⁽⁶⁾	2/28/2023	Common Stock	7500.0	$0	0	D
Employee Stock Option (right to buy)	$81.89	11/10/2020		M			7592	⁽⁷⁾	2/17/2026	Common Stock	7592.0	$0	0	D

Explanation of Responses:
(1)	The reported transaction involves sale transactions ranging from $203.90 to $204.88 per share. The weighted average price per share was $204.39. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.
(2)	The reported transaction involves sale transactions ranging from $204.90 to $205.70 per share. The weighted average price per share was $205.17. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.
(3)	The reported transaction involves sale transactions ranging from $206.28 to $207.17 per share. The weighted average price per share was $206.71. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.
(4)	The reported transaction involves sale transactions ranging from $207.39 to $208.23 per share. The weighted average price per share was $208.13. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.
(5)	The reported transaction involves sale transactions ranging from $208.50 to $208.71 per share. The weighted average price per share was $208.63. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.
(6)	Grant of stock options vesting in one installment on March 1, 2017.
(7)	Grant of stock options vesting in one installment on March 1, 2020.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Mammen Timothy PV C/O IPG PHOTONICS CORPORATION 50 OLD WEBSTER ROAD OXFORD, MA 01540			SVP, Chief Financial Officer