Stock Trading History of Nelson Alan Mark

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 Nelson Alan Mark since year 2005. The trader's CIK number is 1282932. At the time of this reporting, Nelson Alan Mark is the Vice President of Dawson Geophysical Co . (stock ticker symbol DWSN). See this page for all insider trading activities at Dawson Geophysical Co .

Stock purchases, sales, and option exercises reported by insider *Nelson Alan Mark* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-05-13	DWSN	Dawson Geophysical Co	Sale	1,000	78.00	78,000
2007-08-03	DWSN	Dawson Geophysical Co	Sale	3,750	68.22	255,825
2007-08-03	DWSN	Dawson Geophysical Co	Option Exercise	3,750	5.21	19,537
2006-01-04	DWSN	Dawson Geophysical Co	Sale	1,250	31.50	39,375
2006-01-04	DWSN	Dawson Geophysical Co	Option Exercise	1,250	8.65	10,812

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 Nelson Alan Mark (Vice President of Dawson Geophysical Co at the time of this reporting) see the Securities and Exchange Commission (SEC) website.