What is Christopher Gunsten’s GLDD share ownership after this Form 4?

After the reported award, Christopher Gunsten directly holds 99,940 shares of Great Lakes Dredge & Dock common stock. This total reflects the addition of 13,988 restricted stock units granted on February 23, 2026, as disclosed in the insider filing data.

Great Lakes Dredge & Dock (GLDD) SVP receives 13,988-share RSU grant

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corp reported that senior vice president Christopher Gunsten acquired 13,988 shares of common stock on February 23, 2026 through a restricted stock unit award. These units vest in three equal annual installments beginning on February 23, 2027, bringing his directly held shares to 99,940.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider GUNSTEN CHRISTOPHER

Role SVP-Proj Svcs & Fleet Engineer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	13,988	$0.00	--

Holdings After Transaction: Common Stock — 99,940 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 02/25/2026 - 04:51 PM

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

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-Proj Svcs & Fleet Engineer

3. Date of Earliest Transaction (Month/Day/Year)
02/23/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	02/23/2026		A		13,988	A	⁽¹⁾	99,940	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Represents restricted stock units that vest in three equal annual installments beginning on February 23, 2027.

	/s/Vivienne R. Schiffer, by Power of Attorney	02/25/2026
	** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did GLDD report for Christopher Gunsten?

Christopher Gunsten received 13,988 shares of Great Lakes Dredge & Dock common stock as a restricted stock unit award. The grant was reported as an acquisition under a Form 4 insider transaction on February 23, 2026, with no cash price per share.

How do the GLDD restricted stock units for Christopher Gunsten vest?

The 13,988 restricted stock units vest in three equal annual installments. Vesting begins on February 23, 2027, meaning one-third of the award becomes unrestricted each year over three years, assuming any applicable service or other conditions are satisfied.

Was the GLDD insider award to Christopher Gunsten an open-market purchase?

No, the transaction was reported as a grant or award, not an open-market purchase. The price per share is shown as $0.0000, indicating equity compensation rather than a cash purchase on the public market by the executive.

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

Christopher Gunsten serves as Senior Vice President, Project Services & Fleet Engineer at Great Lakes Dredge & Dock. The reported Form 4 transaction reflects an equity award tied to this executive role, structured as restricted stock units in company common stock.