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

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corp SVP Eleni Beyko reported compensation-related stock transactions, not open‑market trading. On March 16, 2026, she received two performance-based common stock awards of 14,754 and 9,852 shares after meeting performance conditions tied to restricted stock units granted in 2023 and 2024.

To cover tax obligations on these vestings, a total of 12,545 shares of common stock were disposed of at $16.93 per share through tax-withholding transactions, which are not market sales. Following these awards and tax withholdings, she directly holds 133,895 shares of Great Lakes Dredge & Dock common stock.

Insider Trade Summary

6 transactions reported

Mixed 6 txns

Insider BEYKO ELENI

Role SVP - Offshore Energy

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	2,645	$16.93	$45K
Grant/Award	Common Stock	14,754	$0.00	--
Tax Withholding	Common Stock	4,773	$16.93	$81K
Tax Withholding	Common Stock	1,939	$16.93	$33K
Grant/Award	Common Stock	9,852	$0.00	--
Tax Withholding	Common Stock	3,188	$16.93	$54K

Holdings After Transaction: Common Stock — 119,189 shares (Direct)

Footnotes (1)

1. Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Ms. Beyko's performance-based restricted stock units granted on March 15, 2023. Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Ms. Beyko's performance-based restricted stock units granted on March 15, 2024.

Form 4 Insider Transactions: What Each Field Means →

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^*

BEYKO ELENI

(Last) (First) (Middle)

C/O GREAT LAKES DREDGE & DOCK CORP.

9811 KATY FREEWAY, SUITE 1200

(Street)

HOUSTON TX 77024

(City) (State) (Zip)

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 - Offshore Energy

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

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

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

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

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		2,645	D	$16.93	119,189	D
Common Stock	03/16/2026		A		14,754	A	(1)	133,943	D
Common Stock	03/16/2026		F		4,773	D	$16.93	129,170	D
Common Stock	03/16/2026		F		1,939	D	$16.93	127,231	D
Common Stock	03/16/2026		A		9,852	A	(2)	137,083	D
Common Stock	03/16/2026		F		3,188	D	$16.93	133,895	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 Ms. Beyko'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 Ms. Beyko'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.
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** 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.
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FAQ

What did GLDD executive Eleni Beyko report in this Form 4 filing?

She reported stock-based compensation activity, not open-market trades. Beyko received two performance-based stock awards and had shares withheld to cover taxes, resulting in a higher direct ownership stake in Great Lakes Dredge & Dock common stock.

How many Great Lakes Dredge (GLDD) shares did Eleni Beyko receive?

She received two grants of common stock: 14,754 shares and 9,852 shares. Both were awarded after performance conditions were satisfied under performance-based restricted stock units granted in 2023 and 2024, increasing her equity-based compensation.

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

No, the reported share disposals were tax-withholding transactions at $16.93 per share. These shares were delivered to satisfy tax obligations triggered by stock vesting, rather than discretionary open-market sales for portfolio or liquidity reasons.

How many GLDD shares does Eleni Beyko own after these transactions?

After the reported awards and tax-withholding disposals, Beyko directly holds 133,895 shares of Great Lakes Dredge & Dock common stock. This figure reflects her updated post-transaction position as shown in the Form 4 transaction detail table.

What do the performance-based restricted stock unit awards mean for GLDD?

They show that specified performance conditions for Beyko’s 2023 and 2024 performance-based restricted stock units were achieved. As a result, common shares were delivered to her as compensation, aligning part of her pay with company performance metrics and share value.

Why were GLDD shares used to pay taxes for Eleni Beyko’s awards?

The filing shows F-coded transactions labeled as payment of tax liability by delivering securities. Instead of paying cash, a portion of vested shares was automatically withheld at $16.93 per share to satisfy tax obligations from the equity awards.