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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1372020	Great Lakes Dredge & Dock Corp	GLDD	Heavy Construction Other Than Bldg Const - Contractors (1600)	205336063

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1317772	Jason Weiss	Great Lakes Dredge &Amp; Dock Corporation 2122 York Road Oak Brook IL 60523		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2010-06-22	2,900	$6.25	666,562	No	4	S	Indirect	Jason G. Weiss Revocable Trust dated August 2, 2000
Common Stock	Disposition	2010-06-23	15,339	$6.14	666,562	No	4	S	Indirect	Jason G. Weiss Revocable Trust dated August 2, 2000
Common Stock	Disposition	2010-06-22	2,900	$6.25	10,476	No	4	S	Indirect	Weiss Family Trust dated August 7, 2000
Common Stock	Disposition	2010-06-23	34,661	$6.14	10,476	No	4	S	Indirect	Weiss Family Trust dated August 7, 2000
Common Stock	Disposition	2010-06-24	35,713	$6.22	10,476	No	4	S	Indirect	Weiss Family Trust dated August 7, 2000

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	Jason G. Weiss Revocable Trust dated August 2, 2000
No	4	S	Indirect	Jason G. Weiss Revocable Trust dated August 2, 2000
No	4	S	Indirect	Weiss Family Trust dated August 7, 2000
No	4	S	Indirect	Weiss Family Trust dated August 7, 2000
No	4	S	Indirect	Weiss Family Trust dated August 7, 2000

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	19,661	Direct
Common Stock	100	Indirect	Common Stock owned by the wife of Mr. Weiss

Footnotes

The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Weiss on February 25, 2010.
Represents weighted average sale price. The sale price range is $6.09 to 6.45. Upon request by the Commission staff, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.
Represents weighted average sale price. The sale price range is $6.12 to 6.17. Upon request by the Commission staff, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.
Represents weighted average sale price. The sale price range is $6.12 to 6.35. Upon request by the Commission staff, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.