NLIGHT INC

nLIGHT, INC.

PROXY STATEMENT

FOR 2025 ANNUAL MEETING OF STOCKHOLDERS

To Be Held at 9:00 a.m. Pacific Time on Tuesday, June 10, 2025

We are furnishing this proxy statement and the enclosed form of proxy in connection with a solicitation of proxies by our board of directors for use at the 2025 annual meeting of stockholders of nLIGHT, Inc., a Delaware corporation (the "Company"), and any postponements, adjournments or continuations thereof (the “Annual Meeting”). The Annual Meeting will be held virtually on Tuesday, June 10, 2025, at 9:00 a.m., Pacific Time. You can attend the Annual Meeting by visiting www.virtualshareholdermeeting.com/LASR2025, where you will be able to listen to the meeting live, submit questions and vote online. The Notice of Internet Availability of Proxy Materials (the “Notice”) containing instructions on how to access this proxy statement and our annual report is first being mailed on or about April 25, 2025, to all stockholders entitled to vote at the Annual Meeting.

The information provided in the “question and answer” format below is for your convenience only and is merely a summary of the information contained in this proxy statement. You should read this entire proxy statement carefully. Information contained on, or that can be accessed through, our website is not intended to be incorporated by reference into this proxy statement and references to our website address in this proxy statement are inactive textual references only.