X0609 4 2026-09-03 0 0001124796 NLIGHT, INC. LASR 0001914846 Corso Joseph John false 4637 NW 18TH AVENUE CAMAS WA 98607 0 1 0 0 Chief Financial Officer 1 Common Stock 2026-09-03 4 S 0 4191 40.69 D 165724 D Common Stock 2026-09-04 4 S 0 3524 41.49 D 162200 D This reported sale represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of restricted stock units. The sale is mandated by the Issuer's election to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary transaction by the Reporting Person. The reported transaction involves sale transactions from $40.69 to $40.69 per share. The weighted average price per share was $40.69. 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. Includes common stock owned and unvested restricted stock units. This reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 15, 2025. The reported transaction involves sale transactions from $41.49 to $41.49 per share. The weighted average price per share was $41.49. 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. /s/ Joseph Corso, as attorney-in-fact 2026-09-08