X0306 4 2016-03-01 0 0000866609 ION GEOPHYSICAL CORP IO 0001507038 Hao Huimin 2105 CITYWEST BOULEVARD SUITE 400 HOUSTON TX 77042 1 0 0 0 Common Stock 2016-03-01 4 F 0 500 3.10 D 5506 D Common Stock 2016-03-01 4 A 0 2500 0.00 A 8006 D Payment of tax liability by delivering or withholding shares incident to the vesting of restricted stock. As adjusted for the one-for-fifteen reverse stock split completed on 02/04/2016. 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. Rebecca F. Sacco, attorney-in-fact 2016-03-03