Stock Trading History of Mackie Douglas B

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Mackie Douglas B since year 2005. The trader's CIK number is 1384109. At the time of this reporting, Mackie Douglas B is the President & CEO of Great Lakes Dredge & Dock Corp . (stock ticker symbol GLDD). See this page for all insider trading activities at Great Lakes Dredge & Dock Corp .

Stock purchases, sales, and option exercises reported by insider *Mackie Douglas B* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-09-15	GLDD	Great Lakes Dredge & Dock Corp	Sale	4,500	6.62	29,790
2008-08-15	GLDD	Great Lakes Dredge & Dock Corp	Sale	5,000	7.66	38,300
2008-07-15	GLDD	Great Lakes Dredge & Dock Corp	Sale	5,000	5.83	29,150
2008-06-16	GLDD	Great Lakes Dredge & Dock Corp	Sale	5,000	5.92	29,600
2008-05-15	GLDD	Great Lakes Dredge & Dock Corp	Sale	5,000	5.51	27,550
2007-12-03	GLDD	Great Lakes Dredge & Dock Corp	Sale	20,000	8.69	173,800
2007-11-21	GLDD	Great Lakes Dredge & Dock Corp	Sale	5,000	8.46	42,300
2007-11-14	GLDD	Great Lakes Dredge & Dock Corp	Sale	19,522	8.50	165,937
2007-11-12	GLDD	Great Lakes Dredge & Dock Corp	Sale	478	8.50	4,063
2007-08-01	GLDD	Great Lakes Dredge & Dock Corp	Sale	10,500	7.05	74,025

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Mackie Douglas B (President & CEO of Great Lakes Dredge & Dock Corp at the time of this reporting) see the Securities and Exchange Commission (SEC) website.