GLDD VP receives stock award, shares withheld for tax

Great Lakes Dredge & Dock VP & CAO Ryan Bayer reported routine equity compensation activity in company stock.

Rhea-AI Filing Summary

Great Lakes Dredge & Dock VP & CAO Ryan Bayer reported routine equity compensation activity in company stock. On March 16, 2026, he received a grant of 2,170 shares of common stock at $0.00 per share, representing performance-based restricted stock units that vested after meeting 2024 performance conditions. On the same date, a total of 2,136 shares were disposed of at $16.93 per share to cover tax obligations, not as open-market sales. After these transactions, Bayer directly held 31,773 shares of common stock.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider BAYER RYAN

Role VP & CAO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	1,282	$16.93	$22K
Grant/Award	Common Stock	2,170	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	854	$16.93	$14K

Holdings After Transaction: Common Stock — 31,773 shares (Direct)

Footnotes (1)

1. F1. Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Mr. Bayer's performance-based restricted stock units granted on March 15, 2024.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did GLDD executive Ryan Bayer report?

Ryan Bayer reported a share grant and related tax-withholding dispositions. He received 2,170 shares of Great Lakes Dredge & Dock common stock and had 2,136 shares withheld at $16.93 per share to satisfy tax liabilities tied to equity compensation.

Was the GLDD Form 4 transaction an open-market buy or sell?

No, the GLDD Form 4 shows no open-market buys or sells. The filing reports a stock grant and two tax-withholding dispositions, where 2,136 shares were delivered at $16.93 per share to cover equity-related tax obligations.

How many GLDD shares does Ryan Bayer hold after these transactions?

After these transactions, Ryan Bayer directly holds 31,773 shares of Great Lakes Dredge & Dock common stock. This balance reflects the net result of the 2,170-share grant and the 2,136 shares disposed to satisfy associated tax obligations.

What type of equity award did GLDD grant to Ryan Bayer?

The award was tied to performance-based restricted stock units. The 2,170 shares granted on March 16, 2026, were awarded upon satisfaction of performance conditions specified in Bayer’s performance-based RSUs originally granted on March 15, 2024.

What does transaction code "F" mean in the GLDD Form 4?

Transaction code “F” indicates shares used to pay exercise price or tax liability. In this GLDD filing, it reflects 1,282 and 854 shares of common stock delivered at $16.93 per share to satisfy tax obligations on equity compensation, not discretionary sales.

What does transaction code "A" signify in this GLDD insider filing?

Transaction code “A” signifies a grant, award, or other acquisition. Here, it represents 2,170 shares of Great Lakes Dredge & Dock common stock awarded to Ryan Bayer as performance-based restricted stock following achievement of pre-set conditions from a 2024 grant.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 03/18/2026 - 04:39 PM Learn about SEC filing dates

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^*

BAYER RYAN

(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)
	VP & CAO

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		1,282	D	$16.93	30,457	D
Common Stock	03/16/2026		A		2,170	A	(1)	32,627	D
Common Stock	03/16/2026		F		854	D	$16.93	31,773	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. Bayer'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)