Great Lakes Dredge & Dock (GLDD) SVP equity award corrected in Form 4/A filing

Rhea-AI Filing Summary

BEYKO ELENI reported acquisition or exercise transactions in this Form 4 filing.

Great Lakes Dredge & Dock Corp reported a routine equity award for SVP – Offshore Energy Eleni Beyko. On May 8, 2025, she received a grant of 15,376 shares of Common Stock at no purchase price as a compensation award, bringing her direct holdings to 105,514 shares.

This Form 4/A amends an earlier filing to fix an administrative error in the vesting schedule for the related Restricted Stock Units. The original filing listed vesting as beginning on March 15, 2026; the corrected vesting start date is May 8, 2026.

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)
05/08/2025

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)
05/12/2025

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	05/08/2025		A		15,376	A	(1)	105,514	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. This Form 4/A is being filed to correct an administrative error in the original Form 4 filed on May 12, 2025 in which the vesting date for the Restricted Stock Units was inadvertently reported as beginning on March 15, 2026. The correct vesting date begins on May 8, 2026.

	/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 report for Eleni Beyko?

Great Lakes Dredge & Dock reported that SVP – Offshore Energy Eleni Beyko received a grant of 15,376 shares of Common Stock on May 8, 2025. The shares were awarded at no purchase price as part of her compensation package.

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

After the reported grant, Eleni Beyko directly holds 105,514 shares of Great Lakes Dredge & Dock Common Stock. This figure represents her total direct ownership following the May 8, 2025 compensation-related award of 15,376 shares.

Why did Great Lakes Dredge & Dock file this Form 4/A amendment?

The company filed this Form 4/A to correct an administrative error in a prior Form 4. The original report showed the Restricted Stock Units vesting beginning March 15, 2026, but the correct vesting start date is May 8, 2026.

Was the GLDD insider transaction a market purchase or sale?

The transaction was not a market trade. It was a grant or award acquisition of 15,376 shares at a price of $0.00 per share, classified as compensation rather than an open-market buy or sell transaction.

What does the corrected vesting date mean for GLDD’s Restricted Stock Units?

The corrected disclosure states that the Restricted Stock Units begin vesting on May 8, 2026. Previously, the vesting start date was mistakenly reported as March 15, 2026, so this amendment aligns the vesting schedule with the actual terms.