Shanahan Kathleen M 4
4 · Great Lakes Dredge & Dock CORP · Filed Jan 20, 2026
Insider Transaction Report
Form 4
Shanahan Kathleen M
Director
Transactions
- Exercise/Conversion
Common Stock
2026-01-15+2,849→ 73,373 total - Exercise/Conversion
Common Stock
2026-01-15+3,002→ 76,375 total - Exercise/Conversion
Deferred Stock Units
[F1][F2]2026-01-15−2,849→ 11,853 total→ Common Stock (2,849 underlying) - Exercise/Conversion
Deferred Stock Units
[F1][F3]2026-01-15−3,002→ 8,851 total→ Common Stock (3,002 underlying)
Footnotes (3)
- [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.
Signature
/s/Vivienne R. Schiffer, by Power of Attorney|2026-01-20