X0609 4 2026-08-21 0 0001124796 NLIGHT, INC. LASR 0001738235 Keeney Scott H false 4637 NW 18TH AVENUE CAMAS WA 98607 1 1 0 0 President and CEO 1 Common Stock 2026-08-21 4 M 0 99706 1.45 A 2284745 D Common Stock 2026-08-21 4 M 0 82044 1.45 A 2366789 D Common Stock 2026-08-21 4 S 0 64729 46.29 D 2302060 D Common Stock 2026-08-21 4 S 0 112470 47.15 D 2189590 D Common Stock 2026-08-21 4 S 0 2459 47.92 D 2187131 D Common Stock 2026-08-21 4 S 0 2092 48.97 D 2185039 D Common Stock 2026-08-24 4 M 0 181750 1.45 A 2366789 D Common Stock 2026-08-24 4 S 0 155008 44.03 D 2211781 D Common Stock 2026-08-24 4 S 0 25039 44.79 D 2186742 D Common Stock 2026-08-24 4 S 0 1703 45.92 D 2185039 D Common Stock 501 I By Keeney Family Revocable Trust Stock Option (Right to Buy) 1.45 2026-08-21 4 M 0 0 0 D 2027-06-02 Common Stock 99706 0 D Stock Option (Right to Buy) 1.45 2026-08-21 4 M 0 0 0 D 2027-06-02 Common Stock 82044 181750 D Stock Option (Right to Buy) 1.45 2026-08-24 4 M 0 0 0 D 2027-06-02 Common Stock 181750 0 D 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 May 22, 2026. The reported transaction involves sale transactions from $45.72 to $46.71 per share. The weighted average price per share was $46.29. 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. The reported transaction involves sale transactions from $46.72 to $47.71 per share. The weighted average price per share was $47.15. 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. The reported transaction involves sale transactions from $47.72 to $48.71 per share. The weighted average price per share was $47.92. 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. The reported transaction involves sale transactions from $48.72 to $49.16 per share. The weighted average price per share was $48.97. 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. The reported transaction involves sale transactions from $43.54 to $44.54 per share. The weighted average price per share was $44.03. 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. The reported transaction involves sale transactions from $44.54 to $45.51 per share. The weighted average price per share was $44.79. 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. The reported transaction involves sale transactions from $45.54 to $46.48 per share. The weighted average price per share was $45.92. 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. Keeney Family Revocable Trust is a revocable living trust for which the reporting person and his spouse are trustees. This grant became fully vested and exercisable on June 1, 2022. This grant became fully vested and exercisable on December 1, 2021. /s/ Joseph Corso, as attorney-in-fact 2026-08-25