|
Form
|
|
(Filer)
|
Received
(
Period
)
|
| SC 13G/A |
 |
ION GEOPHYSICAL CORP (WELLS FARGO & COMPANY/MN) |
03/29/13 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(WELLINGTON MANAGEMENT CO LLP) |
02/14/13 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(WELLS FARGO & COMPANY/MN) |
02/13/13 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(BLACKROCK INC.) |
02/06/13 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(VILLERE ST DENIS J & CO LLC) |
01/08/13 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(FMR LLC) |
08/10/12 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(FMR LLC) |
04/10/12 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(FMR LLC) |
02/14/12 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(BLACKROCK INC.) |
02/13/12 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(WELLS FARGO & COMPANY/MN) (WELLS FARGO & CO/MN) |
01/25/12 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(FLETCHER ASSET MANAGEMENT INC) |
02/14/11 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(FMR LLC) |
02/10/11 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(BLACKROCK INC.) |
02/04/11 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(WELLS FARGO & COMPANY/MN) (WELLS FARGO & CO/MN) |
01/20/11 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(FLETCHER ASSET MANAGEMENT INC) |
02/16/10 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(GW CAPITAL INC) |
09/01/09 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(FLETCHER ASSET MANAGEMENT INC) |
02/17/09 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(CLEARBRIDGE INVESTMENTS, LLC) (CLEARBRIDGE ADVISORS, LLC) |
02/13/09 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(NEUBERGER BERMAN INC) |
02/10/09 |
| SC 13G/A |
|
ION GEOPHYSICAL CORP(NEUBERGER BERMAN INC) |
02/10/09 |