X0306 4 2016-03-01 0 0000866609 ION GEOPHYSICAL CORP IO 0001158640 BARR DAVID H 2105 CITYWEST BLVD. SUITE 400 HOUSTON TX 77042-2839 1 0 0 0 Common Stock 2016-03-01 4 A 0 2500 0.00 A 10433 D Restricted stock grant issued pursuant to the ION Geophysical Corporation Amended and Restated 2013 Long Term Incentive Plan. Award will vest upon the one year anniversary of the date shown in Column 2. As adjusted for the one-for-fifteen reverse stock split completed on 02/04/2016. Rebecca F. Sacco, attorney-in-fact 2016-03-03