Exhibit 1
Transactions Effected During the Past Sixty Days

The following tables set forth all transactions in Common Stock effected by the Reporting Persons during the sixty days prior to the date of the event that requires filing of this statement through the date hereof. Except as otherwise noted below, all sales of Common Stock were effected in open market transactions at prevailing market prices.

The Valentin Gapontsev Trust I

The following sales of Common Stock were effected by The Valentin Gapontsev Trust I pursuant to a Rule 10b5-1 trading plan:
Transaction DateNumber of SharesPrice Per Share (1)Price Per Share Range
01/12/202616,065$76.20$75.47 – $76.45
01/12/20261,928$76.69$76.61 – $76.82
01/13/202616,752$76.71$76.29 – $77.24
01/13/20266,277$77.70$77.31 – $78.00
01/14/20263,667$77.19$76.31 – $77.30
01/14/202613,159$77.63$77.31 – $78.22
01/14/2026700$78.55$78.34 – $78.75
01/15/2026571$79.38$78.66 – $79.63
01/15/20267,381$80.16$79.68 – $80.50
02/17/20266,590$125.40$124.92 – $125.86
02/17/20266,820$126.33$125.92 – $126.88
02/17/20264,354$127.42$126.92 – $127.90
02/17/20265,012$128.33$127.92 – $128.80
02/17/20263,931$129.56$129.02 – $130.01
02/17/20264,931$130.57$130.03 – $131.02
02/17/20268,383$131.67$131.03 – $132.02
02/17/202615,882$132.40$132.03 – $132.99
02/17/20264,035$133.42$133.05 – $133.87
02/17/2026125$134.12-
02/17/20261,381$135.93$135.40 – $136.39
02/17/20261,393$136.89$136.45 – $137.41
02/17/2026790$137.79$137.46 – $138.44
02/17/2026760$138.82$138.50 – $139.10
02/17/2026100$140.58-
02/17/2026376$141.97$141.72 – $142.46
02/17/2026137$143.71$143.00 – $143.72
02/17/2026480$144.29$144.20 – $144.51
02/17/2026410$146.21-
02/17/2026220$148.00-
02/17/2026390$149.88$149.12 – $150.01
07/21/20261,000$100.08$99.84 - $100.57
07/21/20267,100$101.20$100.99 - $101.98
07/21/202624,347$102.04102.00 - $102.94
07/21/202623,869$103.00$103.00 - $103.13
(1) Where applicable, the price shown represents the weighted average price per share for shares sold in multiple transactions. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange


Commission, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price within the respective ranges.

Eugene Scherbakov

The following transactions in Common Stock were effected by Eugene Scherbakov in his individual capacity, except as otherwise noted:
Transaction DateTransaction TypeNumber of SharesPrice Per Share (2)Price Per Share Range
12/23/2025Sale (3)2,655$74.43$73.92 – $74.81
12/23/2025Sale (3)45$74.99$74.93 – $75.00
01/21/2026Sale (3)93$79.33$78.80 – $79.76
01/21/2026Sale (3)1,204$80.37$80.00 – $80.83
01/21/2026Sale (3)1,403$81.57$81.07 – $81.60
02/13/2026Option Exercise (4)7,592 (acquired)$81.89-
02/13/2026Withholding (5)5,727 (disposed)$153.91-
02/24/2026Sale (3)200$135.72$135.42 – $136.01
02/24/2026Sale (3)1,500$137.13$136.60 – $137.50
02/24/2026Sale (3)400$138.33$137.99 – $138.66
02/24/2026Sale (3)600$139.95$139.67 – $139.97
03/01/2026Tax Withholding (6)7,237 (disposed)$131.57-
06/29/2026Sale (3)973$100.43$100.12 - $101.01
06/29/2026Sale (3)250$101.24$101.17 - $101.34
06/29/2026Sale (3)100$102.92-
06/29/2026Sale (3)1$104.63-
06/29/2026Sale (3)200$106.66-
(2) Where applicable, the price shown represents the weighted average price per share for shares sold in multiple transactions. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price within the respective ranges.
(3) This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.
(4) Represents the exercise of employee stock options on a net share settlement basis. The stock options were fully vested and exercisable at an exercise price of $81.89 per share. This transaction was not effected pursuant to the Rule 10b5-1 trading plan.
(5) Represents shares of Common Stock withheld by the Issuer to satisfy the aggregate exercise price and tax withholding obligations in connection with an option exercise. This transaction was not effected pursuant to the Rule 10b5-1 trading plan.
(6) Represents shares of Common Stock withheld by the Issuer to cover tax withholding obligations upon the vesting of restricted stock units. This transaction was not effected pursuant to the Rule 10b5-1 trading plan.

Angelo P. Lopresti

The following transactions in Common Stock were effected by Angelo P. Lopresti in his individual capacity, except as otherwise noted:
Transaction DateTransaction TypeNumber of SharesPrice Per Share (7)
01/21/2026Sale (8)1,500$85.00
02/12/2026Option Exercise (9)5,861 (acquired)$81.89
02/12/2026Withholding (10)4,022 (disposed)$150.25
02/18/2026RSU Grant (11)4,465 (acquired)-


03/01/2026Tax Withholding (12)3,848 (disposed)$131.57
06/29/2026Sale (8)1,000$110.33
(7) Where applicable, the price shown represents the weighted average price per share for shares sold in multiple transactions. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price within the respective ranges.
(8) This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.
(9) Represents the exercise of employee stock options on a net share settlement basis. The stock options were fully vested and exercisable at an exercise price of $81.89 per share.
(10) Represents shares of Common Stock withheld by the Issuer to satisfy the aggregate exercise price and tax withholding obligations in connection with an option exercise.
(11) Represents a 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.
(12) Represents shares of Common Stock withheld by the Issuer to cover tax withholding obligations upon the vesting of restricted stock units.