Vivienne R. Schiffer - 16 Mar 2026 Form 4 Insider Report for Great Lakes Dredge & Dock CORP (GLDD)

Role
SVP, CLO, CCO & Corp Secretary
Signature
/s/Vivienne R. Schiffer
Issuer symbol
GLDD
Transactions as of
16 Mar 2026
Net transactions value
$0
Form type
4
Filing time
18 Mar 2026, 17:22:24 UTC
Previous filing
25 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Schiffer Vivienne SVP, CLO, CCO & Corp Secretary C/O GREAT LAKES DREDGE & DOCK CORP., 9811 KATY FREEWAY, SUITE 1200, HOUSTON /s/Vivienne R. Schiffer 18 Mar 2026 0001835547

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction GLDD Common Stock Tax liability -2,060 -2% $16.93* 99,270 16 Mar 2026 Direct
transaction GLDD Common Stock Award +14,213 +14% 113,483 16 Mar 2026 Direct F1
transaction GLDD Common Stock Tax liability -3,461 -3% $16.93* 110,022 16 Mar 2026 Direct
transaction GLDD Common Stock Tax liability -2,058 -1.9% $16.93* 107,964 16 Mar 2026 Direct
transaction GLDD Common Stock Award +10,454 +9.7% 118,418 16 Mar 2026 Direct F2
transaction GLDD Common Stock Tax liability -2,546 -2.2% $16.93* 115,872 16 Mar 2026 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Ms. Schiffer's performance-based restricted stock units granted on March 15, 2023.
F2 Represents shares awarded pursuant to satisfaction of performance conditions per the terms of Ms. Schiffer's performance-based restricted stock units granted on March 15, 2024.