X0303 4 2011-05-11 0 0000866609 ION GEOPHYSICAL CORP IO 0001072813 LAPEYRE JAMES M JR 2105 CITYWEST BOULEVARD SUITE 400 HOUSTON TX 77042-2839 1 0 0 0 Common Stock 2011-03-15 4 G 0 7500 0.00 D 1593207 D Common stock 2011-05-11 4 P 0 30000 9.9164 A 1623207 D Common Stock 7605345 I Held by Laitram LLC Common Stock 5700 I Held in joint account with spouse. Common Stock 10500 I As co-trustee for children Common Stock 2011-05-11 4 P 0 10000 9.9657 A 187600 I Joint acct with adult child. Common Stock 2011-05-11 4 P 0 10000 9.8615 A 187600 I Joint acct with adult child. Common Stock 2011-05-11 4 P 0 10000 9.856 A 200380 I Joint acct with adult child. The reporting person disclaims beneficial ownership of all securities shown as indirectly owned by him. /s/ Debra A. Addington, attorney-in-fact 2011-05-12