X0206 3 2013-05-14 0 0000866609 ION GEOPHYSICAL CORP IO 0001577175 SCHWAUSCH SCOTT 2105 CITYWEST BOULEVARD SUITE 400 HOUSTON TX 77042-2839 0 1 0 0 VP & Corp Controller Common Stock 10249 D Employee Stock Option (right to buy) 5.96 2013-12-01 2022-12-01 Common Stock 12000 D Employee Stock Option (right to buy) 5.81 2012-12-01 2021-12-01 Common Stock 9600 D Employee Stock Option (right to buy) 7.19 2011-12-01 2020-12-01 Common Stock 8000 D Employee Stock Option (right to buy) 5.44 2010-12-01 2019-12-01 Common Stock 2000 D Employee Stock Option (right to buy) 3.00 2009-12-01 2018-12-01 Common Stock 2000 D Employee Stock Option (right to buy) 15.43 2008-12-01 2017-12-01 Common Stock 2000 D The option became/becomes exercisable in four equal annual installments beginning on the date specified in Column 2. Rebecca F. Sacco, attorney-in-fact 2013-05-21