0001209191-21-027902.txt : 20210421 0001209191-21-027902.hdr.sgml : 20210421 20210421213232 ACCESSION NUMBER: 0001209191-21-027902 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20210419 FILED AS OF DATE: 20210421 DATE AS OF CHANGE: 20210421 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Williamson Ken CENTRAL INDEX KEY: 0001507574 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-12691 FILM NUMBER: 21843047 MAIL ADDRESS: STREET 1: 2105 CITYWEST BLVD. STREET 2: SUITE 100 CITY: HOUSTON STATE: TX ZIP: 77042-2855 ISSUER: 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 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 4 1 doc4.xml FORM 4 SUBMISSION X0306 4 2021-04-19 0 0000866609 ION GEOPHYSICAL CORP IO 0001507574 Williamson Ken 2105 CITYWEST BOULEVARD SUITE 100 HOUSTON TX 77042-2855 0 1 0 0 EVP, Inno & Strat Mktg Common Stock 2021-04-19 4 F 0 23584 2.16 D 140524 D These shares were not sold, but were withheld by ION Geophysical Corporation upon the vesting of restricted stock shares to satisfy tax withholding obligations. /s/ Rebecca F. Sacco, attorney-in-fact 2021-04-21