X0202 4 2008-05-20 0 0001372020 Great Lakes Dredge & Dock CORP GLDD 0001317779 Leight Nathan GREAT LAKES DREDGE & DOCK CORPORATION 2122 YORK ROAD OAKBROOK IL 60523 1 0 0 0 Common Stock 2008-05-20 4 A 0 1386 0.00 A 1364136 D Common Stock 33000 I Common Stock Held by the wife of Mr. Leight Common Stock 367250 I Common Stock Held by the Leight Family Irrevocable Trust Common Stock 52000 I Common Stock Held by the Terrapin Partners Employee Partnership Common Stock 4000 I Common Stock Held by various family trusts Terrapin Partners LLC is the general partner of such partnership, and Mr. Leight is the co-manager of Terrapin Partners LLC. Mr. Leight disclaims beneficial ownership of the securities held by Terrapin Partners LLC, except to the extent of his pecuniary interest therein. 1000 shares of common stock are owned by Bruce Leight UGMA (Mr. Leight's son is the beneficiary), 1000 shares are owned by Jennifer Leight UGMA (Mr. Leight's daughter is the beneficiary), 1000 shares are owned by Keith Leight UGMA (Mr. Leight's son is the beneficiary), and 1000 shares are owned by Lillianne Leight UGMA (Mr. Leight's daughter is the beneficiary). Mr. Leight serves as a trustee or co-trustee of those trusts. /s/ Nathan D. Leight 2008-05-22