X0306 4 2019-03-01 0 0000866609 ION GEOPHYSICAL CORP IO 0001158640 BARR DAVID H 2105 CITYWEST BLVD. SUITE 100 HOUSTON TX 77042-2855 1 0 0 0 Common Stock 2019-03-01 4 A 0 2500 0.00 A 27933 D Restricted Stock grant issued pursuant to the ION Geophysical Corporation Second Amended and Restated 2013 Long Term Incentive Plan. Shares will vest in three equal annual installments beginning the first anniversary of the transaction date in Column 2. /s/ Rebecca F. Sacco, attorney-in-fact 2019-03-05