FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Levenson Ryan   2. Issuer Name and Ticker or Trading Symbol Great Lakes Dredge & Dock CORP [GLDD] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O GREAT LAKES DREDGE & DOCK CORP.,, 2122 YORK ROAD, SECOND FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 02/22/2019 (Street) OAK BROOK, IL 60523 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/22/2019   S   175,409 D $ 8.2838 (1) 2,846,216 I By Privet Fund LP (2) Common Stock 02/25/2019   S   324,591 D $ 8.4012 (3) 2,521,625 I By Privet Fund LP (2) Common Stock 02/26/2019   S   500,000 D $ 8.417 (4) 2,021,625 I By Privet Fund LP (2) Common Stock               148,500 I By Managed Account of Privet Fund Management LLC (5) Common Stock               35,816 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Deferred Stock Units

(6)

(7)

(7)

Common

(8)

30,404

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Levenson Ryan C/O GREAT LAKES DREDGE & DOCK CORP., 2122 YORK ROAD, SECOND FLOOR OAK BROOK, IL 60523	X

Signatures

/s/Kathleen M. LaVoy, by Power of Attorney		02/26/2019
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Represents the weighted average price. These shares were sold in multiple transactions ranging from $8.02 to $8.65, 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 disposed of at each separate price.
(2)	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.
(3)	Represents the weighted average price. These shares were sold in multiple transactions ranging from $8.285 to $8.54, 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 disposed of at each separate price.
(4)	Represents the weighted average price. These shares were sold in multiple transactions ranging from $8.32 to $8.54, 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 disposed of at each separate price.
(5)	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.
(6)	Deferred Stock Units ("DSUs") 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.
(7)	Not Applicable.
(8)	No transaction is being reported at this time. This line is only reporting holdings as of the date hereof.

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