Kathleen Shanahan - Sep 30, 2025 Form 4 Insider Report for Great Lakes Dredge & Dock CORP (GLDD)

Role
Director
Signature
/s/Vivienne R. Schiffer, by Power of Attorney
Stock symbol
GLDD
Transactions as of
Sep 30, 2025
Transactions value $
$0
Form type
4
Date filed
10/1/2025, 05:02 PM
Previous filing
Jul 1, 2025
Next filing
Nov 12, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Shanahan Kathleen M Director C/O GREAT LAKES DREDGE & DOCK CORP., 9811 KATY FREEWAY, SUITE 1200, HOUSTON /s/Vivienne R. Schiffer, by Power of Attorney 2025-10-01 0001292085

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding GLDD Common Stock 70.5K Sep 30, 2025 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction GLDD Deferred Stock Units Award $0 +2.11K +19.74% $0.00 12.8K Sep 30, 2025 Common Stock 2.11K Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Deferred Stock Units ("DSUs") granted September 30, 2025 and deferred pursuant to the Company's Director Deferral Plan. The DSUs will be payable in common stock on a 1-for-1 basis in three equal annual installments beginning January 15, 2026.