| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Shipp Earl L | Director | C/O GREAT LAKES DREDGE & DOCK CORP., 9811 KATY FREEWAY, STE 1200, HOUSTON | /s/Vivienne R. Schiffer, by Power of Attorney | 05 Jan 2026 | 0001721123 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | GLDD | Common Stock | Award | $0 | +1,829 | +4.5% | $0.000000 | 42,619 | 31 Dec 2025 | Direct |