X0306 4/A 2019-12-02 2019-12-04 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 2019-12-02 4 P 0 32625 10.5792 A 222743 I By Privet Fund LP Common Stock 2019-12-03 4 P 0 13839 10.5532 A 236582 I By Privet Fund LP Common Stock 35816 D This amendment is being filed to correct Footnote (1) to the Form 4 filed on 12/04/2019 as the shares were purchased and acquired as properly represented in Table I above. Footnote (1) is corrected to read as follows: Represents the weighted average price. These shares were purchased in multiple transactions ranging from $10.5350 to $10.6000, inclusive. Upon request by the Commision staff, the issuer or security holder of the issuer, the reporting person will provide information regarding the number of shares acquired at each separate price. This amendment is being filed to correct Footnote (3) to the Form 4 filed on 12/04/2019 as the shares were purchased and acquired as properly represented in Table I above. Footnote (3) is corrected to read as follows: Represents the weighted average price. These shares were purchased in multiple transactions ranging from $10.4450 to $10.6000, inclusive. Upon request by the Commision staff, the issuer or security holder of the issuer, the reporting person will provide information regarding the number of shares acquired at each separate price. /s/Kathleen M. LaVoy, by Power of Attorney 2019-12-05