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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
1384117	E David Simonelli	C/O Great Lakes Dredge &Amp; Dock Corp. 2122 York Road, 2Nd Floor Oak Brook IL 60523	Chief Operating Officer	No	Yes	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	Acquisiton	2020-11-10	20,000	$6.45	429,410	No	4	M	Direct
Common Stock	Disposition	2020-11-10	20,000	$11.30	409,410	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option	Disposition	2020-11-10	20,000	$6.45	20,000	$6.45

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
23,024		2022-06-06	No	4	M	Direct

Footnotes

Represents an exercise of vested employee stock options granted on June 6, 2012 under the Great Lakes Dredge & Dock Corporation 2007 Long-Term Incentive Plan.
Represents the weighted average price. The shares were sold in multiple transactions ranging from $11.29 to $11.33 inclusive. Upon request by the Commision 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.
The options vested in three equal installments beginning June 6, 2013.