Great Lakes Dredge & Dock (GLDD) SVP equity grant and vesting date correction

Rhea-AI Filing Summary

GUNSTEN CHRISTOPHER reported acquisition or exercise transactions in this Form 4 filing.

Great Lakes Dredge & Dock Corp reported an amended insider transaction for SVP-Proj Svcs & Fleet Engineer Christopher Gunsten. He received a grant of 13,179 shares of Common Stock on May 8, 2025 at a stated price of $0.00 per share, bringing his direct holdings to 85,952 shares. The amendment corrects an administrative error in the original Form 4 by changing the reported vesting start date for the related Restricted Stock Units from March 15, 2026 to the correct date of May 8, 2026.

Insider Trade Summary

Net Buyer: 13,179 shares

Net Buy 1 txn

Insider GUNSTEN CHRISTOPHER

Role SVP-Proj Svcs & Fleet Engineer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	13,179	$0.00	$0.00

Holdings After Transaction: Common Stock — 85,952 shares (Direct)

Footnotes (1)

1. F1. 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.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 03/25/2026 - 04:53 PM Learn about SEC filing dates

FAQ

What insider transaction did GLDD report for Christopher Gunsten?

Great Lakes Dredge & Dock reported that SVP-Proj Svcs & Fleet Engineer Christopher Gunsten received a grant of 13,179 shares of Common Stock on May 8, 2025. This award was recorded at a price of $0.00 per share as part of his compensation.

How many GLDD shares did Christopher Gunsten hold after this grant?

After receiving the 13,179-share grant, Christopher Gunsten directly held a total of 85,952 shares of Great Lakes Dredge & Dock Common Stock. This figure reflects his position immediately following the reported non-derivative acquisition transaction on May 8, 2025.

What error does this GLDD Form 4/A amendment correct?

The amended Form 4/A corrects an administrative error in the original filing regarding vesting. The initial report showed Restricted Stock Units vesting beginning March 15, 2026, but the correct vesting start date for these units is May 8, 2026.

Was the GLDD insider transaction a market purchase or a compensation grant?

The transaction was a compensation-related grant, not a market purchase. Christopher Gunsten acquired 13,179 shares of Common Stock at a stated price of $0.00 per share, categorized as a grant, award, or other acquisition rather than an open-market buy.

What role does Christopher Gunsten hold at Great Lakes Dredge & Dock?

Christopher Gunsten serves as an officer of Great Lakes Dredge & Dock with the title SVP-Proj Svcs & Fleet Engineer. His Form 4/A filing reflects equity compensation associated with this senior leadership position rather than routine trading activity.

How is the GLDD insider transaction classified in the Form 4/A data?

The transaction is classified as a non-derivative acquisition with code “A,” indicating a grant, award, or other acquisition. The filing’s summary shows one acquisition transaction, no sales, and no derivative exercises for this reporting date.

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
Estimated average burden
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^*

GUNSTEN CHRISTOPHER

(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-Proj Svcs & Fleet Engineer

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		13,179	A	(1)	85,952	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)