IPGP

SEC source: 0001111928-23-000138 · wk-form4_1691008403.xml · nonDerivative · entry 2

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 15,718

F3 · price: The reported transaction involves sale transactions ranging from $131.86 to $132.82 per share. The weighted average price per share was $132.25. 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 sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2023.

SEC source: 0001111928-23-000138 · wk-form4_1691008403.xml · nonDerivative · entry 1

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,011

F2 · price: The reported transaction involves sale transactions ranging from $130.86 to $131.72 per share. The weighted average price per share was $131.27. 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 sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2023.

SEC source: 0001111928-24-000004 · wk-form4a_1706735172.xml · derivative · entry 5

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,068

Underlying: Common Stock · 785 shares

Expires 2024-06-02

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 · kind: On August 2, 2023, the Reporting Person filed a Form 4 (the "Original Form 4") which inadvertently omitted the exercise of an aggregate of 785 options by the Reporting Person. The Original Form 4 reported the sale of shares of Common Stock of the Issuer ("Common Stock") underlying those options, pursuant to a Rule 10b5-1 trading plan. This Form 4 amendment is being filed for the purpose of amending and restating the Original Form 4 solely to report the exercise of the stock options and the resulting increase in beneficial ownership of Common Stock. The Reporting Person has not sold any additional shares of Common Stock beyond those sales reported in the Original Form 4.

F6 · derivative.exercise_date: Grant of stock options vesting in four equal annual installments on June 3, 2015, 2016, 2017 and 2018.

SEC source: 0001111928-24-000004 · wk-form4a_1706735172.xml · nonDerivative · entry 4

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,491

F5 · price: The reported transaction involves sale transactions ranging from $132.86 to $132.96 per share. The weighted average price per share was $132.90. 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.

F2 · acquired: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2023.

SEC source: 0001111928-24-000004 · wk-form4a_1706735172.xml · nonDerivative · entry 3

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,503

F4 · price: The reported transaction involves sale transactions ranging from $131.86 to $132.82 per share. The weighted average price per share was $132.25. 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.

F2 · acquired: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2023.

SEC source: 0001111928-24-000004 · wk-form4a_1706735172.xml · nonDerivative · entry 2

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,796

F3 · price: The reported transaction involves sale transactions ranging from $130.86 to $131.72 per share. The weighted average price per share was $131.27. 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.

F2 · acquired: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2023.

SEC source: 0001111928-24-000004 · wk-form4a_1706735172.xml · nonDerivative · entry 1

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 17,276

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 · kind: On August 2, 2023, the Reporting Person filed a Form 4 (the "Original Form 4") which inadvertently omitted the exercise of an aggregate of 785 options by the Reporting Person. The Original Form 4 reported the sale of shares of Common Stock of the Issuer ("Common Stock") underlying those options, pursuant to a Rule 10b5-1 trading plan. This Form 4 amendment is being filed for the purpose of amending and restating the Original Form 4 solely to report the exercise of the stock options and the resulting increase in beneficial ownership of Common Stock. The Reporting Person has not sold any additional shares of Common Stock beyond those sales reported in the Original Form 4.

SEC source: 0001111928-23-000129 · wk-form4_1690402842.xml · nonDerivative · entry 5

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,303,849

F6 · price: The reported transaction involves sale transactions ranging from $132.12 to $132.92 per share. The weighted average price per share was $132.44. 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 December 15, 2022.

SEC source: 0001111928-23-000129 · wk-form4_1690402842.xml · nonDerivative · entry 4

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,305,501

F5 · price: The reported transaction involves sale transactions ranging from $131.07 to $131.96 per share. The weighted average price per share was $131.50. 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 December 15, 2022.

SEC source: 0001111928-23-000129 · wk-form4_1690402842.xml · nonDerivative · entry 3

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,307,675

F4 · price: The reported transaction involves sale transactions ranging from $130.07 to $131.04 per share. The weighted average price per share was $130.63. 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.

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 December 15, 2022.

SEC source: 0001111928-23-000129 · wk-form4_1690402842.xml · nonDerivative · entry 2

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,308,294

F3 · price: The reported transaction involves sale transactions ranging from $129.06 to $130.05 per share. The weighted average price per share was $129.50. 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 December 15, 2022.

SEC source: 0001111928-23-000129 · wk-form4_1690402842.xml · nonDerivative · entry 1

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,310,475

F2 · price: The reported transaction involves sale transactions ranging from $128.06 to $129.05 per share. The weighted average price per share was $128.36. 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 December 15, 2022.

SEC source: 0001111928-23-000127 · wk-form4_1689367200.xml · nonDerivative · entry 1

Ovtchinnikov Alexander · CIK 0001378547 · SVP, Chief Technology Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,995

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 March 15, 2023.

SEC source: 0001111928-23-000125 · wk-form4_1689193126.xml · nonDerivative · entry 3

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,312,099

F4 · price: The reported transaction involves sale transactions ranging from $134.00 to $134.28 per share. The weighted average price per share was $134.19. 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 December 15, 2022.

SEC source: 0001111928-23-000125 · wk-form4_1689193126.xml · nonDerivative · entry 2

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,314,492

F3 · price: The reported transaction involves sale transactions ranging from $133.00 to $133.96 per share. The weighted average price per share was $133.70. 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 December 15, 2022.

SEC source: 0001111928-23-000125 · wk-form4_1689193126.xml · nonDerivative · entry 1

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,320,075

F2 · price: The reported transaction involves sale transactions ranging from $132.00 to $132.99 per share. The weighted average price per share was $132.27. 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 December 15, 2022.

SEC source: 0001111928-23-000123 · wk-form4_1688155615.xml · derivative · entry 4

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,853

Underlying: Common Stock · 785 shares

Expires 2024-06-02

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.

F4 · derivative.exercise_date: Grant of stock options vesting in four equal annual installments on June 3, 2015, 2016, 2017 and 2018.

SEC source: 0001111928-23-000123 · wk-form4_1688155615.xml · nonDerivative · entry 3

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,491

F3 · price: The reported transaction involves sale transactions ranging from $133.61 to $134.32 per share. The weighted average price per share was $133.89. 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 sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2023.

SEC source: 0001111928-23-000123 · wk-form4_1688155615.xml · nonDerivative · entry 2

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,892

F2 · price: The reported transaction involves sale transactions ranging from $132.61 to $133.59 per share. The weighted average price per share was $133.32. 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 sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2023.

SEC source: 0001111928-23-000123 · wk-form4_1688155615.xml · nonDerivative · entry 1

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,276

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.

SEC source: 0001111928-23-000121 · wk-form4_1687983200.xml · nonDerivative · entry 5

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,320,349

F6 · price: The reported transaction involves sale transactions ranging from $133.47 to $133.50 per share. The weighted average price per share was $133.49. 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 December 15, 2022.

SEC source: 0001111928-23-000121 · wk-form4_1687983200.xml · nonDerivative · entry 4

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,320,406

F5 · price: The reported transaction involves sale transactions ranging from $132.34 to $133.23 per share. The weighted average price per share was $132.62. 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 December 15, 2022.

SEC source: 0001111928-23-000121 · wk-form4_1687983200.xml · nonDerivative · entry 3

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,320,850

F4 · price: The reported transaction involves sale transactions ranging from $131.31 to $132.29 per share. The weighted average price per share was $131.83. 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 December 15, 2022.

SEC source: 0001111928-23-000121 · wk-form4_1687983200.xml · nonDerivative · entry 2

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,325,459

F3 · price: The reported transaction involves sale transactions ranging from $130.30 to $131.28 per share. The weighted average price per share was $130.81. 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 December 15, 2022.

SEC source: 0001111928-23-000121 · wk-form4_1687983200.xml · nonDerivative · entry 1

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,327,550

F2 · price: The reported transaction involves sale transactions ranging from $129.30 to $130.29 per share. The weighted average price per share was $129.78. 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 December 15, 2022.

SEC source: 0001111928-23-000119 · wk-form4_1687466911.xml · nonDerivative · entry 1

Ovtchinnikov Alexander · CIK 0001378547 · SVP, Chief Technology Officer · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 65,929

F2 · price: The reported transaction involves sale transactions ranging from $135.75 to $136.18 per share. The weighted average price per share was $135.85. 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 March 15, 2023.

SEC source: 0001111928-23-000117 · wk-form4_1686947049.xml · derivative · entry 3

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 8,638

Underlying: Common Stock · 785 shares

Expires 2024-06-02

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: Grant of stock options vesting in four equal annual installments on June 3, 2015, 2016, 2017 and 2018.

SEC source: 0001111928-23-000117 · wk-form4_1686947049.xml · nonDerivative · entry 2

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,491

F1 · acquired: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2023.

SEC source: 0001111928-23-000117 · wk-form4_1686947049.xml · nonDerivative · entry 1

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 17,276

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.

SEC source: 0001111928-23-000115 · wk-form4_1686341954.xml · nonDerivative · entry 3

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,328,599

F4 · price: The reported transaction involves sale transactions ranging from $113.41 to $113.44 per share. The weighted average price per share was $113.42. 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 December 15, 2022.

SEC source: 0001111928-23-000115 · wk-form4_1686341954.xml · nonDerivative · entry 2

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,328,753

F3 · price: The reported transaction involves sale transactions ranging from $112.40 to $113.39 per share. The weighted average price per share was $112.92. 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 December 15, 2022.

SEC source: 0001111928-23-000115 · wk-form4_1686341954.xml · nonDerivative · entry 1

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,331,729

F2 · price: The reported transaction involves sale transactions ranging from $111.40 to $112.39 per share. The weighted average price per share was $111.91. 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 December 15, 2022.

SEC source: 0001111928-23-000108 · wk-form4_1685048478.xml · nonDerivative · entry 3

Desmond Jeanmarie F. · CIK 0001713192 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,304

F3 · price: The reported transaction involves sale transactions ranging from $109.66 to $110.46 per share. The weighted average price per share was $109.98. 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.

SEC source: 0001111928-23-000108 · wk-form4_1685048478.xml · nonDerivative · entry 2

Desmond Jeanmarie F. · CIK 0001713192 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,040

F2 · price: The reported transaction involves sale transactions ranging from $108.65 to $109.64 per share. The weighted average price per share was $109.24. 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.

SEC source: 0001111928-23-000096 · wk-form4_1685047684.xml · nonDerivative · entry 4

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,336,849

F5 · price: The reported transaction involves sale transactions ranging from $112.04 to $112.87 per share. The weighted average price per share was $112.30. 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 December 15, 2022.

SEC source: 0001111928-23-000096 · wk-form4_1685047684.xml · nonDerivative · entry 3

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,337,762

F4 · price: The reported transaction involves sale transactions ranging from $110.65 to $111.49 per share. The weighted average price per share was $111.05. 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 December 15, 2022.

SEC source: 0001111928-23-000096 · wk-form4_1685047684.xml · nonDerivative · entry 2

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,338,428

F3 · price: The reported transaction involves sale transactions ranging from $109.65 to $110.64 per share. The weighted average price per share was $110.17. 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.

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 December 15, 2022.

SEC source: 0001111928-23-000096 · wk-form4_1685047684.xml · nonDerivative · entry 1

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,340,104

F2 · price: The reported transaction involves sale transactions ranging from $108.64 to $109.62 per share. The weighted average price per share was $109.22. 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 December 15, 2022.

SEC source: 0001111928-23-000112 · wk-form4_1685048654.xml · nonDerivative · entry 1

Beecher Gregory R · CIK 0001239380 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,999

F1 · shares: Grant of restricted stock units vesting 100% on the earlier of May 23, 2024 or the date of the 2024 annual stockholder meeting of the Issuer.

SEC source: 0001111928-23-000110 · wk-form4_1685048554.xml · nonDerivative · entry 1

CHILD MICHAEL C · CIK 0001262095 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,103

F1 · shares: Grant of restricted stock units vesting 100% on the earlier of May 23, 2024 or the date of the 2024 annual stockholder meeting of the Issuer.

SEC source: 0001111928-23-000108 · wk-form4_1685048478.xml · nonDerivative · entry 1

Desmond Jeanmarie F. · CIK 0001713192 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,484

F1 · shares: Grant of restricted stock units vesting 100% on the earlier of May 23, 2024 or the date of the 2024 annual stockholder meeting of the Issuer.

SEC source: 0001111928-23-000106 · wk-form4_1685048393.xml · nonDerivative · entry 1

Dougherty Greg · CIK 0001325750 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,117

F1 · shares: Grant of restricted stock units vesting 100% on the earlier of May 23, 2024 or the date of the 2024 annual stockholder meeting of the Issuer.

SEC source: 0001111928-23-000102 · wk-form4_1685048008.xml · nonDerivative · entry 1

PEELER JOHN R · CIK 0001053572 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,959

F1 · shares: Grant of restricted stock units vesting 100% on the earlier of May 23, 2024 or the date of the 2024 annual stockholder meeting of the Issuer.

SEC source: 0001111928-23-000104 · wk-form4_1685048101.xml · nonDerivative · entry 2

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,491

F1 · shares: Grant of restricted stock units vesting 100% on the earlier of May 23, 2024 or the date of the 2024 annual stockholder meeting of the Issuer.

SEC source: 0001111928-23-000104 · wk-form4_1685048101.xml · nonDerivative · entry 1

Meurice Eric · CIK 0001372258 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,303

SEC source: 0001111928-23-000100 · wk-form4_1685047910.xml · nonDerivative · entry 1

Agnes Tang · CIK 0001919257 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,663

F1 · shares: Grant of restricted stock units vesting 100% on the earlier of May 23, 2024 or the date of the 2024 annual stockholder meeting of the Issuer.

SEC source: 0001111928-23-000098 · wk-form4_1685047818.xml · nonDerivative · entry 1

Samartsev Igor · CIK 0001378545 · Director · SVP, Chief Scientist

Pavlova Natalia · CIK 0001837766 · Director · Chief Scientist

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: 106,484

F1 · shares: Grant of restricted stock units vesting 100% on the earlier of May 23, 2024 or the date of the 2024 annual stockholder meeting of the Issuer.

SEC source: 0001111928-23-000090 · wf-form4_168357974018630.xml · nonDerivative · entry 2

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,345,099

F3 · price: The reported transaction involves sale transactions ranging from $116.61 to $117.60 per share. The weighted average price per share was $117.00. 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 December 15, 2022.

SEC source: 0001111928-23-000090 · wf-form4_168357974018630.xml · nonDerivative · entry 1

Valentin Gapontsev Trust I · CIK 0001508155 · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 7,345,508

F2 · price: The reported transaction involves sale transactions ranging from $115.61 to $116.60 per share. The weighted average price per share was $115.98. 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 December 15, 2022.

SEC source: 0001111928-23-000088 · wf-form4_168357957617948.xml · nonDerivative · entry 1

Shcherbakov Eugene A · CIK 0001378544 · Director · CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,761

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