GLDD (NASDAQ: GLDD) SVP gets 21,090-share award with 10,394 shares withheld for taxes

Rhea-AI Filing Summary

Great Lakes Dredge & Dock CORP SVP Christopher Gunsten reported compensation-related stock transactions in Great Lakes Dredge & Dock CORP common stock. On March 16, 2026, he received two stock awards totaling 21,090 shares at $0.00 per share after performance conditions were met on prior performance-based restricted stock units granted in March 2023 and March 2024.

On the same date, 10,394 shares were disposed of at $16.93 per share to cover tax liabilities, a non-market tax-withholding mechanism rather than an open-market sale. After these transactions, he directly owned 110,636 shares of common stock.

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

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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^*

GUNSTEN CHRISTOPHER

(Last) (First) (Middle)

C/O GREAT LAKES DREDGE & DOCK CORP.

9811 KATY FREEWAY, SUITE 1200

(Street)

HOUSTON TEXAS 77024

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Great Lakes Dredge & Dock CORP [ GLDD ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP-Proj Svcs & Fleet Engineer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/16/2026		F		2,204	D	$16.93	97,736	D
Common Stock	03/16/2026		A		12,646	A	(1)	110,382	D
Common Stock	03/16/2026		F		4,091	D	$16.93	106,291	D
Common Stock	03/16/2026		F		1,367	D	$16.93	104,924	D
Common Stock	03/16/2026		A		8,444	A	(2)	113,368	D
Common Stock	03/16/2026		F		2,732	D	$16.93	110,636	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Mr. Gunsten's performance-based restricted stock units granted on March 15, 2023.

2. Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Mr. Gunsten's performance-based restricted stock units granted on March 15, 2024.

	/s/Vivienne R. Schiffer, by Power of Attorney	03/18/2026
	** 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)

FAQ

What insider transactions did GLDD executive Christopher Gunsten report?

Christopher Gunsten reported stock awards and related tax withholdings. He received 21,090 Great Lakes Dredge & Dock CORP shares as performance-based awards and had 10,394 shares withheld at $16.93 per share to satisfy tax obligations tied to those equity grants.

How many GLDD shares did Christopher Gunsten receive as awards?

He received 21,090 GLDD common shares as stock awards. These awards came from performance-based restricted stock units granted in March 2023 and March 2024, which converted into shares after the company confirmed that the specified performance conditions had been satisfied.

Were Christopher Gunsten’s GLDD transactions open-market buys or sells?

They were not open-market buys or sells. The Form 4 shows stock awards at $0.00 per share and F-code dispositions representing shares withheld at $16.93 per share solely to cover tax liabilities on those equity grants, not discretionary market trading.

How many GLDD shares were withheld for taxes in Gunsten’s Form 4?

A total of 10,394 GLDD shares were withheld for taxes. These F-code transactions occurred at $16.93 per share and reflect payment of tax obligations by delivering shares, a standard non-market mechanism used when equity awards vest or performance conditions are satisfied.

What is Christopher Gunsten’s GLDD share ownership after these transactions?

After the reported transactions, Christopher Gunsten directly owned 110,636 GLDD common shares. This figure reflects the net impact of his March 16, 2026 stock awards and the associated tax-withholding share dispositions recorded in the Form 4 insider filing.

What do the GLDD Form 4 footnotes say about Gunsten’s stock awards?

The footnotes state the stock awards were issued after performance conditions were satisfied. They explain that the awarded shares came from performance-based restricted stock units originally granted on March 15, 2023 and March 15, 2024, which converted into shares once those performance criteria were met.