GLDD (NASDAQ: GLDD) SVP receives stock awards and 4,859 shares withheld for tax

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corp executive William H. Hanson reported compensation-related stock activity, not open-market trading. On March 16, 2026, he received two awards of common stock, one of 7,853 shares and another of 5,242 shares, as performance-based restricted stock units from grants dated March 15, 2023 and March 15, 2024 met their conditions.

To cover tax obligations on these awards, a total of 4,859 shares of common stock were withheld at a price of $16.93 per share. These F-code transactions reflect tax-withholding dispositions rather than discretionary sales, and the A-code entries represent equity compensation grants.

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^*

HANSON WILLIAM H

(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, Market Development

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		1,030	D	$16.93	67,955.743	D
Common Stock	03/16/2026		A		7,853	A	(1)	75,808.743	D
Common Stock	03/16/2026		F		1,913	D	$16.93	73,895.743	D
Common Stock	03/16/2026		F		639	D	$16.93	73,256.743	D
Common Stock	03/16/2026		A		5,242	A	(2)	78,498.743	D
Common Stock	03/16/2026		F		1,277	D	$16.93	77,221.743	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. Hanson'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. Hanson'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 William H. Hanson report?

William H. Hanson reported stock grants and related tax withholding. He received awards of 7,853 and 5,242 GLDD common shares and had 4,859 shares withheld at $16.93 per share to satisfy tax obligations tied to these performance-based awards.

Were William H. Hanson’s GLDD transactions open-market buys or sells?

The reported GLDD transactions were not open-market buys or sells. Hanson received common shares as equity compensation and had shares withheld under F-code entries solely to cover tax liabilities associated with those performance-based restricted stock unit awards.

How many GLDD shares were granted to William H. Hanson in this Form 4?

Hanson received two separate common stock awards from GLDD. One grant covered 7,853 shares and another covered 5,242 shares, both issued when performance conditions on earlier performance-based restricted stock unit grants from March 2023 and March 2024 were satisfied.

How many GLDD shares were withheld for William H. Hanson’s taxes?

A total of 4,859 GLDD common shares were withheld to cover Hanson’s tax obligations. These F-code transactions occurred at a price of $16.93 per share and represent payment of tax liabilities by delivering securities rather than voluntary stock sales.

What do the A and F transaction codes mean in William H. Hanson’s GLDD filing?

In Hanson’s GLDD Form 4, A-coded transactions record grants or awards of common stock as compensation. F-coded transactions record shares withheld to pay exercise price or tax liabilities, meaning the company retained those shares to satisfy obligations rather than Hanson selling them in the market.

What triggered the GLDD stock awards to William H. Hanson in March 2026?

The stock awards were triggered by performance-based restricted stock units vesting. Footnotes state the shares were awarded after performance conditions were met under RSU grants originally made on March 15, 2023 and March 15, 2024, converting those performance grants into common stock.