GLDD (NASDAQ: GLDD) SVP granted stock awards with shares withheld for taxes

Rhea-AI Filing Summary

Great Lakes Dredge & Dock senior vice president David Johanson reported compensation-related stock activity in company common shares. On March 16, 2026, he received two grants totaling 12,646 and 8,444 shares at $0.00 per share, reflecting performance-based restricted stock units granted in 2023 and 2024.

To cover associated tax obligations, 1,659, 3,080, 1,029 and 2,057 shares were disposed of at $16.93 per share through tax-withholding transactions, which are not open-market sales. After these awards and withholdings, he directly holds 119,216.2594 common shares.

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^*

JOHANSON DAVID

(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-Project Acquisition & Ops

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		1,659	D	$16.93	104,292.2594	D
Common Stock	03/16/2026		A		12,646	A	(1)	116,938.2594	D
Common Stock	03/16/2026		F		3,080	D	$16.93	113,858.2594	D
Common Stock	03/16/2026		F		1,029	D	$16.93	112,829.2594	D
Common Stock	03/16/2026		A		8,444	A	(2)	121,273.2594	D
Common Stock	03/16/2026		F		2,057	D	$16.93	119,216.2594	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. Johanson'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. Johanson'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 David Johanson report?

David Johanson reported stock grants and tax withholdings. He received common stock awards tied to performance-based restricted stock units and had several blocks of shares withheld at $16.93 per share to satisfy tax liabilities, rather than selling shares on the open market.

How many Great Lakes Dredge & Dock (GLDD) shares did Johanson acquire?

Johanson acquired two stock awards totaling 21,090 shares. He received one grant of 12,646 shares and another of 8,444 shares at $0.00 per share, issued upon satisfaction of performance conditions from restricted stock units granted in 2023 and 2024.

Were any of Johanson’s GLDD transactions open-market sales?

The reported dispositions were tax withholdings, not market sales. Four transactions disposing of 1,659, 3,080, 1,029 and 2,057 shares at $16.93 per share were used to cover tax liabilities related to his equity awards.

What is Johanson’s GLDD shareholding after these Form 4 transactions?

Johanson directly holds 119,216.2594 GLDD common shares. This figure reflects his position after receiving performance-based stock awards and having a portion of shares withheld to pay taxes on March 16, 2026.

What do the footnotes say about Johanson’s GLDD stock awards?

The footnotes link the awards to performance-based RSUs. They state that the granted shares were awarded after satisfying performance conditions under restricted stock units originally granted on March 15, 2023, and March 15, 2024.

Does Johanson’s Form 4 for GLDD indicate option exercises or derivatives?

The reported transactions involve only non-derivative common stock. There are no option exercises or remaining derivative positions listed, and the filing describes stock grants and tax-withholding dispositions in GLDD common shares.