X0306 4 2020-06-11 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 2020-06-11 4 S 0 41897 9.3272 D 150221 I By Privet Fund LP Common Stock 2020-06-12 4 S 0 130000 8.9151 D 20221 I By Privet Fund LP Common Stock 35816 D The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.54, inclusive. The reporting person undertakes to provide to Great Lakes Dredge & Dock Corporation, any security holder of Great Lakes Dredge & Dock Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. 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. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.73 to $9.33, inclusive. The reporting person undertakes to provide to Great Lakes Dredge & Dock Corporation, any security holder of Great Lakes Dredge & Dock Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/Kathleen M. LaVoy, by Power of Attorney 2020-06-15