X0407 4 2023-05-10 0 0001372020 Great Lakes Dredge & Dock CORP GLDD 0001363032 Levenson Ryan C/O GREAT LAKES DREDGE & DOCK CORP., 9811 KATY FREEWAY, SUITE 1200 HOUSTON TX 77024 1 0 0 0 0 Common Stock 2023-05-10 4 P 0 66000 6.0476 A 66100 I By Privet Fund LP Common Stock 2023-05-11 4 P 0 66000 6.1343 A 132100 I By Privet Fund LP Represents the weighted average price. The shares were purchased in multiple transactions ranging from $6.005 to $6.06, 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 acquired 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. Represents the weighted average price. The shares were purchased in multiple transactions ranging from $5.945 to $6.20, 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 acquired of at each separate price. /s/Vivienne R. Schiffer, by Power of Attorney 2023-05-12