Company: LASR
Filing Date: 2025-04-25
Form Type: DEF 14A
Source: 0001124796-25-000043
Chunk: 0

Company: NLIGHT, INC.
Filing Date: 2025-04-25
Form: DEF 14A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A
<div align='center'>PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934</div>

Filed by the Registrant ý

Filed by a party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a‑6(e)(2))

ý Definitive Proxy Statement

¨ Definitive Additional Materials

¨ Soliciting Material under §240.14a‑12

#### NLIGHT, INC.
<div align='center'>(Name of Registrant as Specified In Its Charter)</div>

<div align='center'>(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

| Payment of Filing Fee (Check all boxes that apply): |     |                                                                                                     |
| ý                                                   |     | No fee required                                                                                     |
| ¨                                                   |     | Fee paid previously with preliminary materials                                                      |
| ¨                                                   |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

High power lasers for mission critical aerospace & defense and advanced manufacturing applications

#### 2025 Annual Meeting

#### Proxy Statement and Notice of Annual Meeting

#### 4637 NW 18

#### th

#### Avenue

#### Camas, Washington 98607
<div align='center'>NOTICE OF ANNUAL MEETING OF STOCKHOLDERS To Be Held at 9:00 a.m. Pacific Time on Tuesday, June 10, 2025</div>

Dear Stockholders of nLIGHT, Inc.:

We cordially invite you to attend the 2025 annual meeting of stockholders (the “Annual Meeting”) of nLIGHT, Inc., a Delaware corporation, which will be held on Tuesday, June 10, 2025, at 9:00 a.m. Pacific Time . This year’s Annual Meeting will be a completely virtual meeting of stockholders . 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. We are holding the Annual Meeting for the following purposes, as more fully