EASTMAN BRAD

• 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
2004-05-26	2004-05-25	ION Geophysical Corp (IO)	S Sale	89,015 -6.9% 162.94 US$918,464	89,015 -6.9%	162.94	US$918,464
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	13,260 -40.4% 38.43 US$1,187,332	13,260 -40.4%	38.43	US$1,187,332
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	91,077 -2.9% 378.96 US$327,774	91,077 -2.9%	378.96	US$327,774
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	300 -16.8% 6.80 US$2,040	300 -16.8%	6.80	US$2,040
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	621 -29.5% 6.78 US$4,210	621 -29.5%	6.78	US$4,210
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	900 -37.8% 6.78 US$6,102	900 -37.8%	6.78	US$6,102
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	1,000 -40.3% 6.98 US$6,980	1,000 -40.3%	6.98	US$6,980
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	1,000 -40.3% 6.80 US$6,800	1,000 -40.3%	6.80	US$6,800
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	1,100 -42.6% 7.15 US$7,865	1,100 -42.6%	7.15	US$7,865
2004-05-14	2004-05-12	ION Geophysical Corp (IO)	S Sale	3,600 -70.9% 7.00 US$25,200	3,600 -70.9%	7.00	US$25,200