DAVID JOHANSON - 10 Dec 2025 Form 4 Insider Report for Great Lakes Dredge & Dock CORP (GLDD)

Signature
/s/Vivienne R. Schiffer, by Power of Attorney
Issuer symbol
GLDD
Transactions as of
10 Dec 2025
Transactions value $
-$29,308
Form type
4
Filing time
12 Dec 2025, 16:24:29 UTC
Previous filing
04 Dec 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
JOHANSON DAVID SVP-Project Acquisition & Ops C/O GREAT LAKES DREDGE & DOCK CORP., 9811 KATY FREEWAY, SUITE 1200, HOUSTON /s/Vivienne R. Schiffer, by Power of Attorney 12 Dec 2025 0001940445

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction GLDD Common Stock Sale -$29.3K -2.1K -2.23% $13.96 92K 10 Dec 2025 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

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).

Explanation of Responses:

Id Content
F1 The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 18, 2025.
F2 Represents the weighted average price. The shares were sold in multiple transactions ranging from $13.95 to $13.975, inclusive. Upon request by the Commission staff, the issuer or security holder of the issuer, the reporting person will provide information regarding the number of shares disposed at each separate price.