Great Lakes Dredge & Dock (GLDD) CFO gets performance shares, pays taxes in stock

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corp’s SVP & CFO Scott Lee Kornblau reported stock-based compensation and related tax withholding, not open‑market trading. On March 16, 2026, he received two grants of common stock at $0.00 per share tied to performance-based restricted stock units from March 15, 2023 and March 15, 2024.

To cover tax obligations, a total of 22,258 shares of common stock were disposed of at $16.93 per share through tax-withholding transactions. Following these awards and withholdings, Kornblau directly holds 153,608 shares of Great Lakes Dredge & Dock 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^*

Kornblau Scott Lee

(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 & CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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	03/16/2026		F		4,719	D	$16.93	134,014.24	D
Common Stock	03/16/2026		A		22,265	A	(1)	156,279.24	D
Common Stock	03/16/2026		F		8,762	D	$16.93	147,517.24	D
Common Stock	03/16/2026		F		2,926	D	$16.93	144,591.24	D
Common Stock	03/16/2026		A		14,868	A	(2)	159,459.24	D
Common Stock	03/16/2026		F		5,851	D	$16.93	153,608.24	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. Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Mr. Kornblau's performance-based restricted stock units granted on March 15, 2023.

2. Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Mr. Kornblau's performance-based restricted stock units granted on March 15, 2024.

	/s/Vivienne R. Schiffer, by Power of Attorney	03/18/2026
	** 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 did GLDD CFO Scott Kornblau report in this Form 4 filing?

GLDD CFO Scott Kornblau reported stock-based compensation and related tax withholding transactions. He received common stock grants tied to performance-based restricted stock units and had shares withheld at $16.93 per share to satisfy tax obligations, rather than trading shares in the open market.

Were there any open-market stock purchases or sales by GLDD’s CFO?

No open-market purchases or sales were reported by GLDD’s CFO. All dispositions were coded “F,” meaning shares were withheld at $16.93 per share to cover tax liabilities arising from stock awards, so they do not represent discretionary market trades.

How many GLDD shares were withheld for the CFO’s tax obligations?

A total of 22,258 shares of GLDD common stock were disposed of to cover tax obligations. These transactions were coded as tax-withholding events, indicating the shares were delivered to satisfy taxes triggered by stock-based compensation rather than sold on the open market.

What stock awards did the GLDD CFO receive in this transaction set?

The GLDD CFO received two common stock grants at $0.00 per share. Footnotes state these awards reflect satisfaction of performance conditions under performance-based restricted stock units originally granted on March 15, 2023 and March 15, 2024, rewarding achievement of specified performance metrics.

How many GLDD shares does the CFO own after these Form 4 transactions?

After the reported transactions, the CFO directly owns 153,608 shares of GLDD common stock. This figure reflects the net result of the performance-based stock awards and the shares withheld to cover tax liabilities, as disclosed in the post-transaction ownership fields.

What do the performance-based RSU footnotes in the GLDD Form 4 explain?

The footnotes explain that the new shares were awarded after performance conditions were met for RSUs granted on March 15, 2023 and March 15, 2024. They clarify that these are compensation-related awards, not open-market purchases, aligning them with long-term performance incentives.