What is Lasse Petterson’s GLDD share ownership after this transaction?

After the equity grant, Lasse Petterson directly holds 1,159,377.29 shares of Great Lakes Dredge & Dock Common Stock. This figure reflects his position immediately following the reported award in the amended insider transaction disclosure.

Is the GLDD CEO’s share acquisition an open-market purchase or a grant?

The transaction is classified as a grant or award acquisition, not an open-market purchase. Shares were reported at a price of zero per share, indicating a compensation-related equity grant rather than a bought position in the market.

Great Lakes Dredge (GLDD) amends Form 4 on CEO stock grant

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

4/A

Rhea-AI Filing Summary

Petterson Lasse reported acquisition or exercise transactions in this Form 4 filing.

Great Lakes Dredge & Dock Corp reported that CEO and President Lasse Petterson received a grant of 125,145 shares of Common Stock at no cash cost, increasing his directly held stake to 1,159,377.29 shares after the transaction.

This is an amended Form 4 that corrects an administrative error in a prior filing. The company clarifies that the related Restricted Stock Units begin vesting on May 8, 2026, rather than the previously reported March 15, 2026 vesting date.

Insider Trade Summary

Net Buyer: 125,145 shares

Net Buy 1 txn

Insider Petterson Lasse

Role CEO & President

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	125,145	$0.00	$0.00

Holdings After Transaction: Common Stock — 1,159,377.29 shares (Direct)

Footnotes (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 - 04:40 PM

FAQ

What insider transaction did GLDD report in this amended Form 4?

Great Lakes Dredge & Dock reported an amended insider transaction where CEO Lasse Petterson received a grant of 125,145 shares of Common Stock. The amendment also clarifies the vesting schedule for related Restricted Stock Units tied to this equity award.

How many GLDD shares did CEO Lasse Petterson acquire in this filing?

CEO Lasse Petterson acquired 125,145 shares of Great Lakes Dredge & Dock Common Stock through a grant at no stated cash cost. This equity award increased his total directly held position as reflected in the post-transaction ownership figure.

Why did Great Lakes Dredge & Dock file this Form 4/A amendment?

The amendment corrects an administrative error in a prior Form 4, specifically the vesting start date for the associated Restricted Stock Units. The correct vesting date begins on May 8, 2026, replacing the previously reported March 15, 2026 date.

What vesting change for GLDD Restricted Stock Units is disclosed here?

The company states that the Restricted Stock Units tied to this award will begin vesting on May 8, 2026. This replaces an earlier disclosure that incorrectly listed March 15, 2026 as the initial vesting date for those units.

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^*

Petterson Lasse

(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)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	CEO & President

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)
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	05/08/2025		A		125,145	A	⁽¹⁾	1,159,377.29	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. 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)

Source: View Original Filing on SEC EDGAR