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ION GEOPHYSICAL CORP
ION GEOPHYSICAL CORP. Institutional holdings reported to the SEC.

Institutional Holders (2015Q2)
Portfolio Summary: 127 Institutional holders with a total value of $102,967,798.
#
Manager Name
Shares
Value ($)
%
Options
Notes
1 FARMERS & MERCHANTS INVESTMENTS INC 19 0 0.00%
2 US BANCORP \DE\ 90 0 0.00%
3 FIFTH THIRD BANCORP 231 0 0.00%
4 SEI INVESTMENTS CO 569 1,000 0.00%
5 Creative Planning 20,000 1,000 0.00% Call
6 GLENMEDE TRUST CO NA 1,500 1,000 0.00%
7 MANUFACTURERS LIFE INSURANCE COMPANY, THE 717 1,000 0.00%
8 PNC FINANCIAL SERVICES GROUP, INC. 852 1,000 0.00%
9 CITIGROUP INC 1,833 2,000 0.00%
10 BlackRock Finance, Inc. 3,998 4,000 0.00%
11 LADENBURG THALMANN FINANCIAL SERVICES INC. 3,928 4,000 0.00%
12 BROWN BROTHERS HARRIMAN & CO 3,500 4,000 0.00%
13 CANADA LIFE ASSURANCE Co 4,075 4,000 0.00%
14 LS Investment Advisors, LLC 4,295 5,000 0.00%
15 TEACHER RETIREMENT SYSTEM OF TEXAS 5,100 5,000 0.00%
16 TCI Wealth Advisors, Inc. 5,000 5,000 0.00%
17 Pinnacle Summer Investments, Inc. 5,000 5,000 0.00%
18 WealthTrust Axiom LLC 10,000 10,000 0.01%
19 OPPENHEIMER & CO INC 10,500 11,000 0.01%
20 Nuveen Asset Management, LLC 10,021 11,000 0.01%
21 TWO SIGMA INVESTMENTS, LP 10,705 11,000 0.01%
22 TWO SIGMA ADVISERS, LP 11,599 12,000 0.01%
23 SHELTON CAPITAL MANAGEMENT 11,605 12,000 0.01%
24 BNP PARIBAS FINANCIAL MARKETS 11,738 12,560 0.01%
25 Calvert Investment Management, Inc. 11,881 13,000 0.01%
26 Mraz, Amerine & Associates, Inc. 11,900 13,000 0.01%
27 Ameritas Investment Partners, Inc. 11,881 13,000 0.01%
28 BARCLAYS PLC 15,000 15,000 0.01% Put
29 PineBridge Investments, L.P. 14,026 15,000 0.01%
30 HIGHBRIDGE CAPITAL MANAGEMENT LLC 13,596 15,000 0.01%
31 SUSQUEHANNA INTERNATIONAL GROUP, LLP 14,100 15,000 0.01% Call
32 AMALGAMATED BANK 14,567 16,000 0.02%
33 Tower Research Capital LLC (TRC) 14,933 16,000 0.02%
34 Virtu KCG Holdings LLC 17,050 18,000 0.02%
35 BARCLAYS PLC 19,103 19,000 0.02%
36 M&T BANK CORP 17,953 19,000 0.02%
37 MASON STREET ADVISORS, LLC 17,744 19,000 0.02%
38 Legal & General Group Plc 18,461 20,000 0.02%
39 ProShare Advisors LLC 20,134 22,000 0.02%
40 SECOR Capital Advisors, LP 20,676 22,000 0.02%
41 Municipal Employees' Retirement System of Michigan 24,430 26,000 0.03%
42 PROFUND ADVISORS LLC 25,125 27,000 0.03%
43 Commonwealth Equity Services, Inc 27,094 29,000 0.03%
44 UBS Group AG 30,000 32,000 0.03%
45 OAK ASSOCIATES LTD /OH/ 32,550 35,000 0.03%
46 Summit Financial Wealth Advisors, LLC 34,520 36,000 0.03%
47 Paloma Partners Management Co 34,723 37,000 0.04%
48 WOLVERINE ASSET MANAGEMENT LLC 616 38,000 0.04% Put
49 TUDOR INVESTMENT CORP ET AL 37,185 40,000 0.04%
50 D. E. Shaw & Co., Inc. 41,250 44,000 0.04%
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From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.