| 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 | 07 May 2025 | 0001940445 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | GLDD | Common Stock | Tax liability | $5,218 | -547 | -0.6% | $9.54 | 91,162 | 05 May 2025 | Direct | |
| transaction | GLDD | Common Stock | Tax liability | $1,116 | -117 | -0.13% | $9.54 | 91,045 | 05 May 2025 | Direct | |
| transaction | GLDD | Common Stock | Tax liability | $601 | -63 | -0.07% | $9.54 | 90,982 | 05 May 2025 | Direct | |
| transaction | GLDD | Common Stock | Tax liability | $935 | -98 | -0.11% | $9.54 | 90,884 | 05 May 2025 | Direct |