Company:  ION GEOPHYSICAL CORP (IO)
Form Type:  4
Filing Date:  12/5/2011 
CIK:  0000866609 
Address:  2105 CITYWEST BLVD
SUITE 400
 
City, State, Zip:  HOUSTON, Texas 770422839 
Telephone:  281.933.3339 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$4.55  
Change: 
-0.01 (-0.22%)  
Trade Time: 
Apr 23  
Market Cap: 
$752.05M
Description of Business
Register and access this filing in:     
  FORM 4
    NAME AND TITLE
    NON DERIVATIVE SECURITIES
    DERIVATIVE SECURITIES
    EXPLANATIONS AND REMARKS
    REPORTING OWNERS
    SIGNATURES