X0306 4 2019-09-30 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 190118 I By Privet Fund LP Common Stock 35816 D Deferred Stock Units 2019-09-30 4 A 0 4033 0.00 A Common Stock 4033 43158 D 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. Deferred Stock Units ("DSUs") granted September 30, 2019 and deferred pursuant to the Company's Director Deferral Plan. The DSUs will be payable in common stock on a 1-for-1 basis on the date upon which Mr. Levenson's board service ends. /s/Kathleen M. LaVoy, by Power of Attorney 2019-10-02