Company: LASR
Filing Date: 2025-04-30
Form Type: DEFA14A
Source: 0001124796-25-000047
Chunk: 0

Company: NLIGHT, INC.
Filing Date: 2025-04-30
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A

#### PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE

#### SECURITIES EXCHANGE ACT OF 1934
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))

¨ Definitive Proxy Statement

ý 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 |

#### nLIGHT, INC.

#### 4637 NW 18

#### th

#### Avenue

#### Camas, Washington 98607

### NOTICE OF CORRECTION
Notice of Correction to the Proxy Statement for the Annual Meeting of Stockholders to be held on June 10, 2025 (the “Annual Meeting”).

This notice sets forth a correction to information contained in the Proxy Statement, dated April 25, 2025 (the “Proxy Statement”), of nLIGHT, Inc. (the “Company”) that was filed with the Securities and Exchange Commission in connection with the solicitation of proxies on behalf of the Company’s board of directors to be voted at the Annual Meeting. The Proxy Statement included an error on page 39 in listing the names of the members of the Company’s compensation committee under the caption “Compensation Committee Report.” Geoffrey Moore was incorrectly listed as a member of the compensation committee and Bandel Carano was incorrectly deleted as a member. This error is corrected in the information below.

“

#### Compensation Committee Report
The compensation committee has reviewed and discussed the Compensation Discussion and Analysis provided above with management. Based on such review and discussions