Kathleen M. Shanahan - 15 Jan 2026 Form 4 Insider Report for Great Lakes Dredge & Dock CORP (GLDD)

Role
Director
Signature
/s/Vivienne R. Schiffer, by Power of Attorney
Issuer symbol
GLDD
Transactions as of
15 Jan 2026
Net transactions value
$0
Form type
4
Filing time
20 Jan 2026, 16:55:29 UTC
Previous filing
05 Jan 2026
Next filing
04 Mar 2026
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 20 Jan 2026 0001292085

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction GLDD Common Stock Options Exercise $0 +2,849 +4% $0.000000 73,373 15 Jan 2026 Direct
transaction GLDD Common Stock Options Exercise $0 +3,002 +4.1% $0.000000 76,375 15 Jan 2026 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 Options Exercise $0 -2,849 -19% $0.000000 11,853 15 Jan 2026 Common Stock 2,849 Direct F1, F2
transaction GLDD Deferred Stock Units Options Exercise $0 -3,002 -25% $0.000000 8,851 15 Jan 2026 Common Stock 3,002 Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each Deferred Stock Unit ("DSUs") represents the right to receive, at settlement, one share of the Issuer's Common Stock.
F2 These DSUs, which were granted in 2024, vest in two equal installments on January 15 of 2026 and 2027 or, if earlier, on the date on which the Reporting Person's board service ends.
F3 These DSUs, which were granted in 2025, vest in three equal installments on January 15 of 2026, 2027 and 2028 or, if earlier, on the date on which the Reporting Person's board service ends.