GLDD VP & CAO granted 10,126 shares

Great Lakes Dredge & Dock Corp VP & CAO Ryan Bayer reported an acquisition of 10,126 shares of common stock on May 8, 2025, received as a grant or award at no stated purchase price.

Accepted by SEC EDGAR 03/25/2026 - 05:14 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corp VP & CAO Ryan Bayer reported an acquisition of 10,126 shares of common stock on May 8, 2025, received as a grant or award at no stated purchase price. After this equity award, he directly holds 24,574 shares. The amended filing also corrects an administrative error by changing the vesting start date for the related restricted stock units from March 15, 2026 to the correct date of May 8, 2026.

Insider Trade Summary

Grant/Award: 10,126 shares

Grant/Award 1 txn

Insider BAYER RYAN

Role VP & CAO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	10,126	$0.00	$0.00

Holdings After Transaction: Common Stock — 24,574 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.

FAQ

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

What insider transaction did GLDD report for Ryan Bayer?

GLDD reported that VP & CAO Ryan Bayer acquired 10,126 shares of common stock on May 8, 2025 through a grant or award, not a market purchase. This increased his directly held position to 24,574 shares after the transaction.

Was the GLDD Form 4/A for Ryan Bayer a new transaction or a correction?

The Form 4/A for GLDD executive Ryan Bayer is primarily a correction. It states the original filing contained an administrative error in the vesting schedule, and clarifies the correct vesting start date for the related restricted stock units as May 8, 2026.

How many GLDD shares does Ryan Bayer hold after this equity award?

After receiving the equity award, GLDD VP & CAO Ryan Bayer directly holds 24,574 shares of common stock. This figure includes the 10,126 shares acquired in the reported grant, reflecting his updated direct ownership position following the transaction.

What vesting date change is disclosed in the GLDD Form 4/A footnote?

The GLDD Form 4/A footnote explains that the vesting start date for the related restricted stock units was incorrectly reported as March 15, 2026. The corrected disclosure states the proper vesting date begins on May 8, 2026 instead.

Is Ryan Bayer’s GLDD share ownership direct or indirect in this filing?

In this filing, Ryan Bayer’s ownership of GLDD common stock is reported as direct. The transaction record shows a direct ownership type, and the total of 24,574 shares following the transaction is attributed to his direct holdings.

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

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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)
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		10,126	A	(1)	24,574	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)