X0306 4 2018-03-29 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 35816 D Common Stock 3146625 I By Privet Fund LP Common Stock 148500 I By Managed Account of Privet Fund Management LLC Deferred Stock Units 2018-03-29 4 A 0 8913 0.00 A Common Stock 8913 8913 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. Represents shares held in an account separately managed by Privet Fund Management (the "Privet Fund Account"). Mr. Levenson, solely by virtue of his position as the managing member of Privet Fund Management, the investment manager of the Privet Fund Account, may be deemed to beneficially own the shares held in the Privet Fund Account for purposes of Section 16. Mr. Levenson expressly disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. Deferred Stock Units ("DSUs") granted March 29, 2018 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 2018-04-02