Were the nLIGHT (LASR) CFO’s share sales discretionary trades?

The disclosure states the sales were made to cover tax withholding obligations from RSU vesting under a required sell-to-cover arrangement. It notes these trades do not represent discretionary decisions by the CFO but follow the issuer’s withholding election.

[Form 4] NLIGHT, INC. Insider Trading Activity

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

nLIGHT, Inc. Chief Financial Officer Joseph John Corso reported selling 55,719 shares of common stock on May 19–20, 2026 in open-market transactions at prices ranging from $68.48 to $71.36 per share.

According to the disclosure, these sales were made to cover tax withholding obligations related to vesting and settlement of restricted stock units under a mandatory "sell to cover" arrangement and were executed pursuant to a Rule 10b5-1 trading plan adopted on September 15, 2025. Following the reported transactions, Corso continued to hold 177,572 shares of common stock directly, which includes unvested restricted stock units.

Insider Trade Summary 10b5-1

Net Seller: 55,719 shares ($3,883,827)

Net Sell 5 txns

Insider Corso Joseph John

Role Chief Financial Officer

Sold 55,719 shs ($3.88M)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,903	$68.81	$131K
Sale	Common Stock	12,946	$69.98	$906K
Sale	Common Stock	19,090	$70.77	$1.35M
Sale	Common Stock	1,537	$71.36	$110K
Sale	Common Stock	20,243	$68.48	$1.39M

Holdings After Transaction: Common Stock — 211,145 shares (Direct, null)

Footnotes (1)

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 $68.48 to $68.48 per share. The weighted average price per share was $68.48. 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. These reported sales were 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 $68.31 to $69.29 per share. The weighted average price per share was $68.81. 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 $69.31 to $70.31 per share. The weighted average price per share was $69.98. 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 $70.31 to $71.30 per share. The weighted average price per share was $70.77. 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 $71.31 to $71.58 per share. The weighted average price per share was $71.36. 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.

Key Figures

Shares sold: 55,719 shares Sale price range: $68.48–$71.36 per share Post-transaction holdings: 177,572 shares +5 more

8 metrics

Shares sold 55,719 shares Total common shares sold May 19–20, 2026

Sale price range $68.48–$71.36 per share Reported open-market sale prices

Post-transaction holdings 177,572 shares Common stock directly held after reported sales

Weighted average price band 1 $68.48 per share Weighted average for transactions from $68.48 to $68.48

Weighted average price band 2 $68.81 per share Weighted average for transactions from $68.31 to $69.29

Weighted average price band 3 $69.98 per share Weighted average for transactions from $69.31 to $70.31

Weighted average price band 4 $70.77 per share Weighted average for transactions from $70.31 to $71.30

RSU-related tax sale 1 transaction group Sales designated to cover RSU tax withholding

Key Terms

Rule 10b5-1 trading plan, restricted stock units, sell to cover, tax withholding obligations, +2 more

6 terms

Rule 10b5-1 trading plan financial

"These reported sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 15, 2025."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

restricted stock units financial

"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."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

sell to cover financial

"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."

Sell to cover is when a person who receives company stock through options or awards sells just enough shares immediately to pay required taxes, exercise costs, or fees, keeping the rest. Think of it like cashing part of a bonus to cover the tax bill so you can keep the remainder. For investors, it can create predictable small selling pressure and slightly change the number of shares actually held by insiders without increasing long‑term dilution.

tax withholding obligations financial

"shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of restricted stock units."

unvested restricted stock units financial

"Includes common stock owned and unvested restricted stock units."

Form 4 Insider Transactions: What Each Field Means →

05/21/2026 - 08:29 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Corso Joseph John

(Last)

(First)

(Middle)

4637 NW 18TH AVENUE

(Street)

CAMAS

WASHINGTON

98607

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
NLIGHT, INC. [ LASR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/19/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/19/2026		S		20,243⁽¹⁾	D	$68.48⁽²⁾	213,048⁽³⁾	D
Common Stock	05/20/2026		S		1,903⁽⁴⁾	D	$68.81⁽⁵⁾	211,145⁽³⁾	D
Common Stock	05/20/2026		S		12,946⁽⁴⁾	D	$69.98⁽⁶⁾	198,199⁽³⁾	D
Common Stock	05/20/2026		S		19,090⁽⁴⁾	D	$70.77⁽⁷⁾	179,109⁽³⁾	D
Common Stock	05/20/2026		S		1,537⁽⁴⁾	D	$71.36⁽⁸⁾	177,572⁽³⁾	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. 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.

2. The reported transaction involves sale transactions from $68.48 to $68.48 per share. The weighted average price per share was $68.48. 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.

3. Includes common stock owned and unvested restricted stock units.

4. These reported sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 15, 2025.

5. The reported transaction involves sale transactions from $68.31 to $69.29 per share. The weighted average price per share was $68.81. 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.

6. The reported transaction involves sale transactions from $69.31 to $70.31 per share. The weighted average price per share was $69.98. 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.

7. The reported transaction involves sale transactions from $70.31 to $71.30 per share. The weighted average price per share was $70.77. 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.

8. The reported transaction involves sale transactions from $71.31 to $71.58 per share. The weighted average price per share was $71.36. 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.

Remarks:

	/s/ Julie Dimmick, as attorney-in-fact	05/21/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did nLIGHT (LASR) report for its CFO?

nLIGHT’s CFO, Joseph John Corso, reported selling 55,719 shares of common stock on May 19–20, 2026. The open-market sales were primarily to cover tax withholding obligations tied to restricted stock unit vesting under a mandatory sell-to-cover arrangement.

At what prices did the nLIGHT (LASR) CFO sell his shares?

The CFO’s reported sales occurred at prices ranging from $68.48 to $71.36 per share. Footnotes also disclose weighted average prices for price bands, including $68.48, $68.81, $69.98, $70.77 and $71.36 per share across the grouped transactions.

How many nLIGHT (LASR) shares does the CFO hold after the reported sales?

After the reported transactions, the CFO held 177,572 shares of nLIGHT common stock directly. This figure, disclosed in the report, includes both common stock already owned and unvested restricted stock units credited to his beneficial holdings.

Were the nLIGHT (LASR) CFO’s sales made under a Rule 10b5-1 plan?

Yes. A footnote explains the reported sales were executed under a Rule 10b5-1 trading plan adopted by the CFO on September 15, 2025. Such pre-arranged plans schedule trades in advance, reducing the role of short-term market timing judgments.

What role did restricted stock units play in the nLIGHT (LASR) CFO’s transaction?

The filing links the sales to vesting and settlement of restricted stock units granted to the CFO. Shares were sold to fund associated tax withholding obligations, and his post-transaction holdings still include both common stock and unvested restricted stock units.