<SEC-DOCUMENT>0001104659-21-024913-index.html : 20210218 <SEC-HEADER>0001104659-21-024913.hdr.sgml : 20210218 <ACCEPTANCE-DATETIME>20210217182317 ACCESSION NUMBER: 0001104659-21-024913 CONFORMED SUBMISSION TYPE: 424B5 PUBLIC DOCUMENT COUNT: 3 FILED AS OF DATE: 20210218 DATE AS OF CHANGE: 20210217 FILER: COMPANY DATA: COMPANY CONFORMED NAME: ION GEOPHYSICAL CORP CENTRAL INDEX KEY: 0000866609 STANDARD INDUSTRIAL CLASSIFICATION: OIL AND GAS FIELD EXPLORATION SERVICES [1382] IRS NUMBER: 222286646 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 424B5 SEC ACT: 1933 Act SEC FILE NUMBER: 333-234606 FILM NUMBER: 21646708 BUSINESS ADDRESS: STREET 1: 2105 CITYWEST BLVD STREET 2: SUITE 100 CITY: HOUSTON STATE: TX ZIP: 770422855 BUSINESS PHONE: 2819333339 MAIL ADDRESS: STREET 1: 2105 CITYWEST BLVD STREET 2: SUITE 100 CITY: HOUSTON STATE: TX ZIP: 770422855 FORMER COMPANY: FORMER CONFORMED NAME: INPUT OUTPUT INC DATE OF NAME CHANGE: 19930328 </SEC-HEADER> <DOCUMENT> <TYPE>424B5 <SEQUENCE>1 <FILENAME>tm216767-1_424b5.htm <DESCRIPTION>424B5 <TEXT> Document 1 - file: tm216767-1_424b5.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>2 <FILENAME>lg_ion-4c.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 2 - file: lg_ion-4c.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>3 <FILENAME>lg_ionpowering-pn.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 3 - file: lg_ionpowering-pn.jpg
</DOCUMENT> </SEC-DOCUMENT>