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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
1317779	Nathan Leight	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
Common Stock	Acquisiton	2010-09-08	4,000	$4.72	1,464,015	No	4	P	Direct
Common Stock	Acquisiton	2010-09-09	3,600	$4.87	1,464,015	No	4	P	Direct
Common Stock	Acquisiton	2010-09-09	400	$4.87	1,464,015	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	P	Direct
No	4	P	Direct
No	4	P	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	367,250	Indirect	Common Stock Held by the Leight Family Irrevocable Trust
Common Stock	4,000	Indirect	Common Stock Held by various family trusts

Footnotes

This purchase of Common Stock was made following the September 8, 2010 analyst call, announced in the Issuer's September 7, 2010 Press Release.
1000 shares of common stock are owned by Bruce Leight UGMA (Mr. Leight's son is the beneficiary), 1000 shares are owned by Jennifer Leight UGMA (Mr. Leight's daughter is the beneficiary), 1000 shares are owned by Keith Leight UGMA (Mr. Leight's son is the beneficiary), and 1000 shares are owned by Lillianne Leight UGMA (Mr. Leight's daughter is the beneficiary). Mr. Leight serves as a trustee or co-trustee of those trusts.