| 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 | Vivienne R. Schiffer | 07 May 2025 | 0001835547 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | GLDD | Common Stock | Tax liability | $10,208 | -1,070 | -1.6% | $9.54 | 64,829 | 05 May 2025 | Direct | |
| transaction | GLDD | Common Stock | Tax liability | $6,516 | -683 | -1.1% | $9.54 | 64,146 | 05 May 2025 | Direct |