X0609 4/A 2026-03-06 2026-03-09 0000820318 COHERENT CORP. COHR 0001741413 Digirolomo Enrico false C/O COHERENT CORP. 375 SAXONBURG BOULEVARD SAXONBURG PA 16056 true false false false false Common Stock 2026-03-06 4 M false 1005 49.9 A 22362 D Common Stock 2026-03-06 4 M false 2906 36.56 A 25268 D Common Stock 2026-03-06 4 S false 3911 241.5 D 21357 D Common Stock 2026-03-06 4 G false 1847 0 D 19510 D Option (Right to Buy) 49.9 2026-03-06 1005 0 D 2028-08-28 Common Stock 1005 0 D Option (Right to Buy) 36.56 2026-03-06 2906 0 D 2029-08-28 Common Stock 2906 0 D Reports the donation of 1,847 shares of common stock to a donor advised fund. These options vested in four equal annual installments beginning on August 28, 2019. These options vested in four equal annual installments beginning on August 28, 2020. The original Form 4 filed on March 9, 2026 (the "Original Filing") is amended by this Form 4/A solely to report shares of common stock acquired in connection with the exercise of stock options by the reporting person that were inadvertently omitted from the Original Filing. Column 5 of Table I has been updated to reflect the number of shares of common stock beneficially owned by the reporting person immediately following the reported acquisition that was omitted in the Original Filing. Other than the corrections reflected herein, no changes have been made to the transactions previously reported in the Original Filing. /s/ Christopher M. Forrester, Attorney-in-Fact 2026-09-02