Great Lakes Dredge (GLDD) CEO granted stock, uses shares for taxes

Rhea-AI Filing Summary

Great Lakes Dredge & Dock CORP CEO Lasse Petterson reported equity compensation activity in company stock. On March 16, 2026, he acquired 94,540 and 78,924 shares of common stock as grants tied to performance-based restricted stock units from March 15, 2023 and March 15, 2024. To cover tax obligations, 103,821 shares were withheld at $16.93 per share through several F-code transactions, which are not open-market sales. After these awards and tax withholdings, he directly holds 1,361,845.29 shares of common stock.

Insights

Equity compensation analyst

CEO received performance-based stock, with shares withheld only for taxes.

CEO Lasse Petterson received two grants of Great Lakes Dredge & Dock common stock, totaling 94,540 and 78,924 shares. Footnotes state these awards reflect satisfaction of performance conditions for performance-based restricted stock units granted in March 2023 and March 2024, so this is compensation-driven, not open-market buying.

Four F-code transactions, totaling 103,821 shares at $16.93 per share, represent shares delivered to cover tax liabilities rather than discretionary sales. After all grants and tax withholding dispositions, Petterson directly holds 1,361,845.29 shares, indicating he retains a substantial equity position. There are no remaining derivative positions listed in this filing.

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
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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^*

Petterson Lasse

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CEO & President

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		A		94,540	A	(1)	1,386,742.29	D
Common Stock	03/16/2026		F		37,202	D	$16.93	1,349,540.29	D
Common Stock	03/16/2026		F		20,033	D	$16.93	1,329,507.29	D
Common Stock	03/16/2026		F		15,529	D	$16.93	1,313,978.29	D
Common Stock	03/16/2026		A		78,924	A	(2)	1,392,902.29	D
Common Stock	03/16/2026		F		31,057	D	$16.93	1,361,845.29	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. Petterson'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. Petterson'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 CEO Lasse Petterson report on March 16, 2026?

Lasse Petterson reported stock-based compensation activity, not market trades. He received two common stock grants and had shares withheld to pay taxes. All transactions involved Great Lakes Dredge & Dock CORP common stock on March 16, 2026.

How many Great Lakes Dredge & Dock (GLDD) shares did the CEO receive as awards?

The CEO received 94,540 and 78,924 shares of common stock as awards. Footnotes explain these reflect performance-based restricted stock units granted in March 2023 and March 2024 that vested after performance conditions were satisfied.

Were any of the GLDD CEO’s reported transactions open-market sales of stock?

None of the reported transactions were open-market sales. The disposition entries are F-code transactions, meaning shares were delivered to pay exercise price or tax liabilities, rather than sold in the open market for investment purposes.

At what price were GLDD shares used for the CEO’s tax withholding transactions?

Shares used to satisfy tax liabilities were valued at $16.93 per share. Multiple F-code transactions on March 16, 2026 used this price as the basis for delivering shares to cover the CEO’s tax obligations tied to the equity awards.

How many GLDD shares were withheld to cover the CEO’s tax obligations?

A total of 103,821 shares of Great Lakes Dredge & Dock common stock were delivered in F-code transactions. These dispositions reflect shares used to pay tax liabilities associated with the performance-based restricted stock unit awards, not discretionary sales.

What is the GLDD CEO’s direct shareholding after these Form 4 transactions?

After the reported grants and tax-withholding dispositions, the CEO directly holds 1,361,845.29 shares of Great Lakes Dredge & Dock common stock. This figure comes from the final total_shares_following_transaction value disclosed in the March 16, 2026 Form 4 data.