Great Lakes Dredge (GLDD) SVP withholds 8,088 shares for taxes

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corp senior vice president of offshore energy, Eleni Beyko, reported a routine share disposition related to tax withholding. On this Form 4, 8,088 shares of common stock were withheld at $13.12 per share to cover tax obligations, rather than sold on the open market. Following this non‑market transaction, Beyko directly holds 125,807 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^*

BEYKO ELENI

(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 - Offshore Energy

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
12/31/2025

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	12/31/2025		F		8,088	D	$13.12	125,807	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:

	/s/Vivienne R. Schiffer, by Power of Attorney	03/25/2026
	** 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 transaction did GLDD executive Eleni Beyko report on this Form 4?

Eleni Beyko reported a tax-related share disposition. The Great Lakes Dredge & Dock Corp SVP had 8,088 shares of common stock withheld at $13.12 per share to satisfy tax obligations, rather than selling them in an open-market transaction.

Was the GLDD Form 4 transaction an open-market sale of shares?

No, the GLDD transaction was not an open-market sale. The Form 4 shows a code F transaction, meaning 8,088 shares were withheld to pay taxes, a non-market tax-withholding disposition rather than a discretionary sale into the market.

How many GLDD shares were involved in the tax-withholding disposition?

The transaction involved 8,088 GLDD shares. These common shares were withheld at a price of $13.12 each to cover tax liabilities associated with equity compensation, instead of being sold through regular market trading.

How many GLDD shares does Eleni Beyko hold after this Form 4 transaction?

After the transaction, Eleni Beyko holds 125,807 GLDD shares. The Form 4 shows this as her direct ownership of Great Lakes Dredge & Dock Corp common stock following the 8,088-share tax-withholding disposition.

What does transaction code F mean on the GLDD Form 4 for Eleni Beyko?

Code F indicates a tax-withholding disposition. For GLDD, this means 8,088 shares were delivered back to satisfy tax liabilities on equity compensation, not voluntarily sold into the open market by the executive.

What role does Eleni Beyko hold at Great Lakes Dredge & Dock Corp?

Eleni Beyko serves as SVP - Offshore Energy at GLDD. The Form 4 lists her as an officer with the title "SVP - Offshore Energy," reporting this routine tax-withholding share disposition related to her equity compensation.