GLDD executive granted 19,149 restricted shares

Great Lakes Dredge & Dock Corp executive receives stock award.

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corp executive receives stock award. On February 23, 2026, SVP, CLO, CCO & Corporate Secretary Vivienne Schiffer acquired 19,149 shares of Great Lakes Dredge & Dock common stock through a grant or award at a stated price of $0.00 per share.

These shares are in the form of restricted stock units that vest in three equal annual installments beginning on February 23, 2027, aligning the award with multi-year performance and retention. After this grant, Schiffer directly holds a total of 101,330 shares of the company’s common stock.

Insider Trade Summary

Grant/Award: 19,149 shares

Grant/Award 1 txn

Insider Schiffer Vivienne

Role SVP, CLO, CCO & Corp Secretary

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	19,149	$0.00	$0.00

Holdings After Transaction: Common Stock — 101,330 shares (Direct)

Footnotes (1)

1. F1. Represents restricted stock units that vest in three equal annual installments beginning on February 23, 2027.

FAQ

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

What did Great Lakes Dredge & Dock (GLDD) insider Vivienne Schiffer report on this Form 4?

Vivienne Schiffer reported receiving 19,149 shares of Great Lakes Dredge & Dock common stock as a grant or award. The award increased her direct holdings to 101,330 shares, reflecting equity-based compensation rather than an open-market stock purchase.

How many Great Lakes Dredge & Dock (GLDD) shares did Vivienne Schiffer acquire?

Vivienne Schiffer acquired 19,149 shares of Great Lakes Dredge & Dock common stock. The shares were granted at a stated price of $0.00 per share as part of an equity award, rather than being bought on the open market for cash consideration.

What type of equity award did GLDD grant to Vivienne Schiffer?

The award to Vivienne Schiffer consists of restricted stock units representing 19,149 shares of Great Lakes Dredge & Dock common stock. These units are subject to vesting conditions over time, meaning the underlying shares are earned gradually rather than all at once.

When do Vivienne Schiffer’s restricted stock units in Great Lakes Dredge & Dock vest?

Vivienne Schiffer’s restricted stock units vest in three equal annual installments beginning on February 23, 2027. This schedule spreads vesting over three years, creating a multi-year incentive and retention mechanism tied to her continued service with the company.

What is Vivienne Schiffer’s total direct ownership in Great Lakes Dredge & Dock after this award?

After receiving the 19,149-share grant, Vivienne Schiffer directly holds 101,330 shares of Great Lakes Dredge & Dock common stock. This total includes the newly granted restricted stock units, reflecting her enlarged equity stake as a senior executive of the company.

Did Vivienne Schiffer pay cash for the 19,149 GLDD shares reported on the Form 4?

No, Vivienne Schiffer did not pay cash for these shares. The 19,149 Great Lakes Dredge & Dock shares were granted at a stated price of $0.00 per share, indicating an equity compensation award rather than an open-market purchase using personal funds.

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

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Accepted by SEC EDGAR 02/25/2026 - 05:04 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^*

Schiffer Vivienne

(Last) (First) (Middle)

C/O GREAT LAKES DREDGE & DOCK CORP.

9811 KATY FREEWAY, SUITE 1200

(Street)

HOUSTON TX 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, CLO, CCO & Corp Secretary

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/23/2026		A		19,149	A	(1)	101,330	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 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.