Great Lakes Dredge (GLDD) SVP gets 8,237-share grant, fixes RSU date

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corp senior vice president of market development William H. Hanson reported an acquisition of 8,237 shares of common stock as a grant or award on May 8, 2025, at no purchase price. After this grant, he directly holds 68,977 shares. The amended filing also corrects an earlier administrative error by stating that the related restricted stock units begin vesting on May 8, 2026, rather than March 15, 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^*

HANSON WILLIAM H

(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, Market Development

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		8,237	A	(1)	68,977	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 executive William H. Hanson report?

William H. Hanson reported receiving 8,237 shares of Great Lakes Dredge & Dock common stock as a grant or award on May 8, 2025, at no purchase price, increasing his direct holdings to 68,977 shares after the transaction.

Is the GLDD Form 4/A filing a buy or a compensation grant?

The GLDD Form 4/A reflects a compensation-related grant or award, not an open-market purchase. Hanson received 8,237 shares of common stock at a price of $0.00 per share, which is typical for equity compensation rather than a discretionary stock purchase.

How many GLDD shares does William H. Hanson own after this Form 4/A?

After the reported grant, William H. Hanson directly owns 68,977 shares of Great Lakes Dredge & Dock common stock. This total includes the 8,237 shares acquired through the May 8, 2025 grant described in the amended Form 4/A filing.

What administrative error does the GLDD Form 4/A correct?

The amended filing corrects a previously reported vesting date for restricted stock units. The original Form 4 stated vesting began March 15, 2026, but the corrected Form 4/A clarifies the proper vesting start date is May 8, 2026 for those units.

Does the GLDD Form 4/A mention restricted stock unit vesting?

Yes. A footnote explains that the filing corrects the vesting date for restricted stock units. The correct vesting date begins on May 8, 2026, replacing the inadvertently reported date of March 15, 2026 in the earlier Form 4.