PARDUE HOWELL W

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other

Notification date	Transaction date	Company	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value
2004-07-06	2004-07-02	Dawson Geophysical Co (DWSN)	S Sale	58,510 +9.6% 445.73 US$1,307,643	58,510 +9.6%	445.73	US$1,307,643
2004-07-06	2004-07-02	Dawson Geophysical Co (DWSN)	S Sale	42,801 -43.6% 297.29 US$4,183,179	42,801 -43.6%	297.29	US$4,183,179
2004-07-06	2004-07-02	Dawson Geophysical Co (DWSN)	S Sale	75,450 +27.4% 194.87 US$138,756	75,450 +27.4%	194.87	US$138,756
2004-07-06	2004-07-02	Dawson Geophysical Co (DWSN)	S Sale	3,500 -4.4% 23.15 US$81,025	3,500 -4.4%	23.15	US$81,025
2004-07-06	2004-07-02	Dawson Geophysical Co (DWSN)	S Sale	3,500 -4.2% 23.10 US$80,850	3,500 -4.2%	23.10	US$80,850
2004-07-06	2004-07-02	Dawson Geophysical Co (DWSN)	S Sale	3,000 -3.5% 23.20 US$69,600	3,000 -3.5%	23.20	US$69,600
2004-07-06	2004-07-02	Dawson Geophysical Co (DWSN)	S Sale	1,500 -1.7% 23.30 US$34,950	1,500 -1.7%	23.30	US$34,950