<SEC-DOCUMENT>0000902664-21-002547-index.html : 20210430 <SEC-HEADER>0000902664-21-002547.hdr.sgml : 20210430 <ACCEPTANCE-DATETIME>20210430170030 ACCESSION NUMBER: 0000902664-21-002547 CONFORMED SUBMISSION TYPE: SC 13D PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20210430 DATE AS OF CHANGE: 20210430 GROUP MEMBERS: JEFFREY L. GATES SUBJECT COMPANY: 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: SC 13D SEC ACT: 1934 Act SEC FILE NUMBER: 005-41602 FILM NUMBER: 21879299 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 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: Gates Capital Management, Inc. CENTRAL INDEX KEY: 0001312908 IRS NUMBER: 133886865 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13D BUSINESS ADDRESS: STREET 1: 1177 AVE. OF THE AMERICAS STREET 2: 46TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10036 BUSINESS PHONE: 212-626-1421 MAIL ADDRESS: STREET 1: 1177 AVE. OF THE AMERICAS STREET 2: 46TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10036 FORMER COMPANY: FORMER CONFORMED NAME: Gates Capital Management Inc. DATE OF NAME CHANGE: 20041228 </SEC-HEADER> <DOCUMENT> <TYPE>SC 13D <SEQUENCE>1 <FILENAME>p21-1264sc13d.htm <DESCRIPTION>ION GEOPHYSICAL CORPORATION <TEXT> Document 1 - file: p21-1264sc13d.htm
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