-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, Tv99ykWty0Qf43QFsG8dcdY2UbPyT6wVEsYuT2qghvfUpt0Rv0mtbbY2NyeDh72E aJHTuZrE4tqIjw1zSPUBjg== 0000867262-09-000012.txt : 20090901 0000867262-09-000012.hdr.sgml : 20090901 20090901164640 ACCESSION NUMBER: 0000867262-09-000012 CONFORMED SUBMISSION TYPE: SC 13G/A PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20090901 DATE AS OF CHANGE: 20090901 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 13G/A SEC ACT: 1934 Act SEC FILE NUMBER: 005-41602 FILM NUMBER: 091049003 BUSINESS ADDRESS: STREET 1: 2105 CITYWEST BLVD STREET 2: SUITE 400 CITY: HOUSTON STATE: TX ZIP: 770422839 BUSINESS PHONE: 281.933.3339 MAIL ADDRESS: STREET 1: 2105 CITYWEST BLVD STREET 2: SUITE 400 CITY: HOUSTON STATE: TX ZIP: 770422839 FORMER COMPANY: FORMER CONFORMED NAME: INPUT OUTPUT INC DATE OF NAME CHANGE: 19930328 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: GW CAPITAL INC CENTRAL INDEX KEY: 0000867262 IRS NUMBER: 680204817 STATE OF INCORPORATION: WA FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A BUSINESS ADDRESS: STREET 1: 10900 NE EIGHTH ST STE 1010 CITY: BELLEVUE STATE: WA ZIP: 98004-4405 BUSINESS PHONE: 4254554551 MAIL ADDRESS: STREET 1: 10900 NE 8TH ST STREET 2: #1010 CITY: BELLEVUE STATE: WA ZIP: 98004 SC 13G/A 1 gw13gio.txt GW CAPITAL IO 13GA Item 1 (a). Ion Geophysical Item 1 (b). 2105 CityWest BLVD, Suite 400 Houston, TX 77042-2839 Item 2 (a). GW Capital, Inc. Item 2 (b). 10900 NE 8th St., Suite 1010 Bellevue, WA 98004 Item 2 (c). Not Applicable Item 2 (d). Common Stock Item 2 (e). 462044108 Item 3 Investment Advisor registered under Section 203 of the Investment Advisors Act of 1940 Item 4 (a). 3,695,601 Item 4 (b). 3.1% Item 4 (c). (i) 2,743,447 (ii) 0 (iii) 3,695,601 (iv) 0 Item 5 No longer a beneficial owner Item 6 Not Applicable Item 7 Not Applicable Item 8 Not Applicable Item 9 Not Applicable Item 10 Not Applicable After reasonable inquiry and to the best of my know- Ledge and belief, I certify that the information set Forth in the statement is true, complete and correct. August 7, 2009 Guy Watanabe Guy Watanabe President -----END PRIVACY-ENHANCED MESSAGE-----