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Form SC 13G/A - Statement of Beneficial Ownership by Certain Investors: [Amend]
SEC Accession No. 0000914208-13-000398
Filing Date
2013-06-10
Accepted
2013-06-10 12:58:38
Documents
1

Document Format Files

Seq Description Document Type Size
1 ION GEOPHYSICAL CORPORATION iongeophscorp05312013.htm SC 13G/A 39997
  Complete submission text file 0000914208-13-000398.txt   41947
Mailing Address 2105 CITYWEST BLVD SUITE 400 HOUSTON TX 770422839
Business Address 2105 CITYWEST BLVD SUITE 400 HOUSTON TX 770422839 281.933.3339
ION GEOPHYSICAL CORP (Subject) CIK: 0000866609 (see all company filings)

IRS No.: 222286646 | State of Incorp.: DE | Fiscal Year End: 1231
Type: SC 13G/A | Act: 34 | File No.: 005-41602 | Film No.: 13902821
SIC: 1382 Oil & Gas Field Exploration Services

Mailing Address 1555 PEACHTREE STREET NE SUITE 1800 ATLANTA GA 30309
Business Address 1555 PEACHTREE STREET NE SUITE 1800 ATLANTA GA 30309 404-892-0896
Invesco Ltd. (Filed by) CIK: 0000914208 (see all company filings)

IRS No.: 980557567 | State of Incorp.: D0 | Fiscal Year End: 1231
Type: SC 13G/A
SIC: 6282 Investment Advice