IPGP

SEC source: 0001111928-26-000107 · wk-form4_1778703229.xml · nonDerivative · entry 1

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,239

F1 · shares: Grant of restricted stock units vesting in full on the earlier of the first anniversary of the grant date or the next annual stockholders' meeting that occurs at least 50 weeks after the prior year's meeting, subject to the Reporting Person's continued services as a director of the Issuer through the vesting date.

SEC source: 0001111928-26-000105 · wk-form4_1778703196.xml · nonDerivative · entry 1

Samartsev Igor · CIK 0001378545 · SVP, Chief Scientist

Pavlova Natalia · CIK 0001837766 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Wife

Disclosed balance after: 115,701

F1 · shares: Grant of restricted stock units vesting in full on the earlier of the first anniversary of the grant date or the next annual stockholders' meeting that occurs at least 50 weeks after the prior year's meeting, subject to the Reporting Person's continued services as a director of the Issuer through the vesting date.

SEC source: 0001111928-26-000103 · wk-form4_1778703156.xml · nonDerivative · entry 1

Agnes Tang · CIK 0001919257 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,099

F1 · shares: Grant of restricted stock units vesting in full on the earlier of the first anniversary of the grant date or the next annual stockholders' meeting that occurs at least 50 weeks after the prior year's meeting, subject to the Reporting Person's continued services as a director of the Issuer through the vesting date.

SEC source: 0001111928-26-000101 · wk-form4_1778703113.xml · nonDerivative · entry 1

Beecher Gregory R · CIK 0001239380 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,216

F1 · shares: Grant of restricted stock units vesting in full on the earlier of the first anniversary of the grant date or the next annual stockholders' meeting that occurs at least 50 weeks after the prior year's meeting, subject to the Reporting Person's continued services as a director of the Issuer through the vesting date.

SEC source: 0001111928-26-000076 · wk-form4_1773781573.xml · nonDerivative · entry 1

Buttarazzi Mary E. · CIK 0002060185 · VP, Corp Controller and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,749

SEC source: 0001111928-26-000065 · wk-form4_1772573940.xml · nonDerivative · entry 1

Gitin Mark Milton · CIK 0001842711 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,873

F1 · shares: Represents shares withheld to cover taxes for restricted stock units which have vested.

SEC source: 0001111928-26-000063 · wk-form4_1772573890.xml · nonDerivative · entry 1

Lopresti Angelo P · CIK 0001378548 · SVP, Secretary & Gen Counsel · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,841

F1 · shares: Represents shares withheld to cover taxes for restricted stock units which have vested.

SEC source: 0001111928-26-000061 · wk-form4_1772573838.xml · nonDerivative · entry 1

Mammen Timothy PV · CIK 0001378546 · SVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 86,413

F1 · shares: Represents shares withheld to cover taxes for restricted stock units which have vested.

SEC source: 0001111928-26-000059 · wk-form4_1772573753.xml · nonDerivative · entry 1

Ness Trevor · CIK 0001568884 · SVP, Chief Revenue Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,425

F1 · shares: Represents shares withheld to cover taxes for restricted stock units which have vested.

SEC source: 0001111928-26-000055 · wk-form4_1772573647.xml · nonDerivative · entry 1

SCHERBAKOV EUGENE A · CIK 0001378544 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,258

F1 · shares: Represents shares withheld to cover taxes for restricted stock units which have vested.

SEC source: 0001111928-26-000057 · wk-form4_1772573711.xml · nonDerivative · entry 1

Buttarazzi Mary E. · CIK 0002060185 · VP, Corp Controller and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,249

F1 · shares: Represents shares withheld to cover taxes for restricted stock units which have vested.

SEC source: 0001111928-26-000053 · wk-form4_1772573579.xml · nonDerivative · entry 1

Samartsev Igor · CIK 0001378545 · SVP, Chief Scientist

Pavlova Natalia · CIK 0001837766 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,449

F1 · shares: Represents shares withheld to cover taxes for restricted stock units which have vested.

F2 · ownership.direct: Ms. Pavlova, a director, is an indirect beneficial owner of such shares as the spouse of Dr. Samartsev, an officer.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 12

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,529,002

F12 · price: The reported transaction involves sale transactions ranging from $136.60 to $137.53 per share. The weighted average price per share was $137.00. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 11

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,530,522

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000044 · wk-form4_1771968333.xml · nonDerivative · entry 4

SCHERBAKOV EUGENE A · CIK 0001378544 · Director · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 58,495

F5 · price: The reported transaction involves sale transactions ranging from $139.67 to $139.97 per share. The weighted average price per share was $139.95. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000044 · wk-form4_1771968333.xml · nonDerivative · entry 3

SCHERBAKOV EUGENE A · CIK 0001378544 · Director · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 59,095

F4 · price: The reported transaction involves sale transactions ranging from $137.99 to $138.66 per share. The weighted average price per share was $138.33. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000044 · wk-form4_1771968333.xml · nonDerivative · entry 2

SCHERBAKOV EUGENE A · CIK 0001378544 · Director · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 59,495

F3 · price: The reported transaction involves sale transactions ranging from $136.60 to $137.50 per share. The weighted average price per share was $137.13. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000044 · wk-form4_1771968333.xml · nonDerivative · entry 1

SCHERBAKOV EUGENE A · CIK 0001378544 · Director · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 60,995

F2 · price: The reported transaction involves sale transactions ranging from $135.42 to $136.01 per share. The weighted average price per share was $135.72. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 10

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,530,622

F11 · price: The reported transaction involves sale transactions ranging from $134.92 to $135.12 per share. The weighted average price per share was $134.95. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 9

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,530,742

F10 · price: The reported transaction involves sale transactions ranging from $133.91 to $134.81 per share. The weighted average price per share was $134.35. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 8

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,547,163

F9 · price: The reported transaction involves sale transactions ranging from $132.91 to $133.90 per share. The weighted average price per share was $133.61. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 7

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,555,157

F8 · price: The reported transaction involves sale transactions ranging from $131.88 to $132.82 per share. The weighted average price per share was $132.31. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 6

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,559,761

F7 · price: The reported transaction involves sale transactions ranging from $130.84 to $131.82 per share. The weighted average price per share was $131.41. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 5

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,564,002

F6 · price: The reported transaction involves sale transactions ranging from $132.75 to $133.35 per share. The weighted average price per share was $132.94. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 4

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,569,486

F5 · price: The reported transaction involves sale transactions ranging from $131.74 to $132.72 per share. The weighted average price per share was $132.21. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 3

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,585,908

F4 · price: The reported transaction involves sale transactions ranging from $130.64 to $131.17 per share. The weighted average price per share was $131.11. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 2

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,590,369

F3 · price: The reported transaction involves sale transactions ranging from $129.49 to $130.28 per share. The weighted average price per share was $129.93. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000046 · wk-form4_1771968403.xml · nonDerivative · entry 1

IP FIBRE DEVICES LTD · CIK 0001130423 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,592,669

F2 · price: The reported transaction involves sale transactions ranging from $128.33 to $129.10 per share. The weighted average price per share was $128.79. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000025 · wk-form4_1771623308.xml · nonDerivative · entry 1

Gitin Mark Milton · CIK 0001842711 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 99,476

F1 · price: Grant of restricted stock units vesting in three annual installments of 33%, 33% and 34% on March 1, 2027, March 1, 2028 and March 1, 2029, respectively.

F2 · balance_after: Includes 172 shares acquired under the IPG Photonics Employee Stock Purchase Plan on June 30, 2025 and 175 shares acquired under the IPG Photonics Employee Stock Purchase Plan on December 31, 2025.

SEC source: 0001111928-26-000037 · wk-form4_1771623650.xml · nonDerivative · entry 1

Buttarazzi Mary E. · CIK 0002060185 · VP, Corp Controller and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,684

F1 · price: Grant of restricted stock units vesting in three annual installments of 33%, 33% and 34% on March 1, 2027, March 1, 2028 and March 1, 2029, respectively.

SEC source: 0001111928-26-000035 · wk-form4_1771623599.xml · nonDerivative · entry 1

Ness Trevor · CIK 0001568884 · SVP, Chief Revenue Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,827

F1 · price: Grant of restricted stock units vesting in three annual installments of 33%, 33% and 34% on March 1, 2027, March 1, 2028 and March 1, 2029, respectively.

SEC source: 0001111928-26-000033 · wk-form4_1771623548.xml · nonDerivative · entry 1

Mammen Timothy PV · CIK 0001378546 · SVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,723

F1 · price: Grant of restricted stock units vesting in three annual installments of 33%, 33% and 34% on March 1, 2027, March 1, 2028 and March 1, 2029, respectively.

SEC source: 0001111928-26-000027 · wk-form4_1771623354.xml · nonDerivative · entry 1

Lopresti Angelo P · CIK 0001378548 · SVP, Secretary & Gen Counsel · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,689

F1 · price: Grant of restricted stock units vesting in three annual installments of 33%, 33% and 34% on March 1, 2027, March 1, 2028 and March 1, 2029, respectively.

SEC source: 0001111928-26-000031 · wk-form4_1771623494.xml · nonDerivative · entry 1

Bucher Paulus · CIK 0001929263 · SVP, Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,716

F1 · price: Grant of restricted stock units vesting in three annual installments of 33%, 33% and 34% on March 1, 2027, March 1, 2028 and March 1, 2029, respectively.

SEC source: 0001111928-26-000029 · wk-form4_1771623434.xml · nonDerivative · entry 1

Samartsev Igor · CIK 0001378545 · SVP, Chief Scientist

Pavlova Natalia · CIK 0001837766 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,688

F1 · price: Grant of restricted stock units vesting in three annual installments of 33%, 33% and 34% on March 1, 2027, March 1, 2028 and March 1, 2029, respectively.

F2 · ownership.direct: Ms. Pavlova, a director, is an indirect beneficial owner of such shares as the spouse of Dr. Samartsev, an officer.

SEC source: 0001111928-26-000021 · wk-form4_1771370759.xml · derivative · entry 14

Samartsev Igor · CIK 0001378545 · SVP, Chief Scientist

Pavlova Natalia · CIK 0001837766 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,363 shares

Expires 2026-02-17

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The stock option is fully vested and exercisable.

SEC source: 0001111928-26-000021 · wk-form4_1771370759.xml · nonDerivative · entry 1

Samartsev Igor · CIK 0001378545 · SVP, Chief Scientist

Pavlova Natalia · CIK 0001837766 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,597

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · ownership.direct: Ms. Pavlova, a director, is an indirect beneficial owner of such shares as the spouse of Dr. Samartsev, an officer.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 21

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,726,599

F18 · price: The reported transaction involves sale transactions ranging from $149.12 to $150.01 per share. The weighted average price per share was $149.88. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 20

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,726,989

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 19

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,727,209

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 18

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,727,619

F17 · price: The reported transaction involves sale transactions ranging from $144.20 to $144.51 per share. The weighted average price per share was $144.29. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 17

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,728,099

F16 · price: The reported transaction involves sale transactions ranging from $143.00 to $143.72 per share. The weighted average price per share was $143.71. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 16

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,728,236

F15 · price: The reported transaction involves sale transactions ranging from $141.72 to $142.46 per share. The weighted average price per share was $141.97. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 15

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,728,612

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 14

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,728,712

F14 · price: The reported transaction involves sale transactions ranging from $138.50 to $139.10 per share. The weighted average price per share was $138.82. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 13

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,729,472

F13 · price: The reported transaction involves sale transactions ranging from $137.46 to $138.44 per share. The weighted average price per share was $137.79. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 12

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,730,262

F12 · price: The reported transaction involves sale transactions ranging from $136.45 to $137.41 per share. The weighted average price per share was $136.89. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 11

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,731,655

F11 · price: The reported transaction involves sale transactions ranging from $135.40 to $136.39 per share. The weighted average price per share was $135.93. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 10

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,733,036

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

SEC source: 0001111928-26-000023 · wk-form4_1771449673.xml · nonDerivative · entry 9

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,733,161

F10 · price: The reported transaction involves sale transactions ranging from $133.05 to $133.87 per share. The weighted average price per share was $133.42. 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.

F1 · acquired: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.