X0306 4 2020-12-14 0 0001372020 Great Lakes Dredge & Dock CORP GLDD 0001363032 Levenson Ryan C/O GREAT LAKES DREDGE & DOCK CORP., 2122 YORK ROAD, SECOND FLOOR OAK BROOK IL 60523 1 0 0 0 Common Stock 2020-12-10 4 S 0 35816 11.6273 D 0 D Common Stock 2020-12-10 4 S 0 20139 11.6733 D 82 I By Privet Fund LP Represents the weighted average price. The shares were sold in multiple transactions ranging from $11.60 to $11.73 inclusive. Upon request by the Commission staff, the issuer or security holder of the issuer, the reporting person will provide information regarding the number of shares disposed of at each separate price. Represents the weighted average price. The shares were sold in multiple transactions ranging from $11.61 to $11.70, inclusive. Upon request by the Commission staff, the issuer or security holder of the issuer, the reporting person will provide information regarding the number of shares disposed of at each separate price. Represents shares owned directly by Privet Fund LP ("Privet Fund"). Mr. Levenson, solely by virtue of his position as the managing member of Privet Fund Management LLC ("Privet Fund Management"), the general partner and investment manager of Privet Fund, may be deemed to beneficially own the shares owned directly by Privet Fund for purposes of Section 16. Mr. Levenson disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. /s/Kathleen M. LaVoy, by Power of Attorney 2020-12-14