X0306 4 2012-12-01 0 0000866609 ION GEOPHYSICAL CORP IO 0001297501 Hanson R Brian 2105 CITYWEST BOULEVARD SUITE 400 HOUSTON TX 77042-2839 1 1 0 0 President & CEO Common Stock 2012-12-01 4 F 0 9113 5.96 D 117670 D Common Stock 2012-12-01 4 A 0 45000 0.00 A 162670 D Employee stock option (right to buy) 5.96 2013-12-01 2022-12-01 Common Stock 75000 75000 D Issued pursuant to the ION Geophysical Corporation 2004 Long-Term Incentive Plan. Shares will vest in three equal annual installments beginning the first anniversary of the transaction date in Column 2. The reporting person transferred in January 2012, (i) 52,495 shares of common stock directly owned by him and his IRA and (ii) employee stock options to purchase 52,500 shares of common stock, to his ex-wife pursuant to a domestic relations order. Footnote 1 to the reporting person's last ownership report filed on September 6, 2012, had incorrectly overstated by 6,613 shares the number of shares directly owned by him that were transferred under the order. The options become exercisable in four equal annual installments beginning on the date specified in Column 6. /s/ Debra A. Addington, attorney-in-fact 2012-12-04