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

Institutional Holders (2017Q1)
Portfolio Summary: 52 Institutional holders with a total value of $20,586,000.
#
Manager Name
Shares
Value ($)
%
Options
Notes
1 Invesco Ltd. 1,305,864 6,334,000 30.77%
2 Gates Capital Management, Inc. 582,946 2,827,000 13.73%
3 VANGUARD GROUP INC 360,088 1,747,000 8.49%
4 DIMENSIONAL FUND ADVISORS LP 265,378 1,287,000 6.25%
5 RENAISSANCE TECHNOLOGIES LLC 232,982 1,130,000 5.49%
6 BlackRock Finance, Inc. 188,860 916,000 4.45%
7 Neuberger Berman Group LLC 186,140 903,000 4.39%
8 BRIDGEWAY CAPITAL MANAGEMENT, LLC 155,724 755,000 3.67%
9 JPMORGAN CHASE & CO 95,783 464,000 2.25%
10 Connor, Clark & Lunn Investment Management Ltd. 83,021 403,000 1.96%
11 ROYCE & ASSOCIATES LP 71,880 349,000 1.70%
12 WELLS FARGO & COMPANY/MN 69,920 339,000 1.65%
13 Spark Investment Management LLC 64,678 313,000 1.52%
14 GOLDMAN SACHS GROUP INC 57,892 281,000 1.37%
15 IMPAX ASSET MANAGEMENT LLC 50,000 243,000 1.18%
16 OXFORD ASSET MANAGEMENT LLP 49,379 239,000 1.16%
17 CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM 43,966 213,000 1.03%
18 ALGERT GLOBAL LLC 42,959 208,000 1.01%
19 GEODE CAPITAL MANAGEMENT, LLC 42,046 203,000 0.99%
20 A.R.T. Advisors, LLC 41,680 202,000 0.98%
21 BROOKFIELD Corp /ON/ 37,750 183,000 0.89%
22 State of New Jersey Common Pension Fund D 30,666 149,000 0.72%
23 NORTHERN TRUST CORP 27,826 135,000 0.66%
24 JACOBS LEVY EQUITY MANAGEMENT, INC 22,359 108,000 0.52%
25 Bank of New York Mellon Corp 20,914 102,000 0.50%
26 LSV ASSET MANAGEMENT 21,200 102,000 0.50%
27 DUPONT CAPITAL MANAGEMENT CORP 14,266 69,000 0.34%
28 ALAMBIC INVESTMENT MANAGEMENT, L.P. 13,900 67,000 0.33%
29 HighTower Advisors, LLC 13,333 65,000 0.32%
30 SUSQUEHANNA INTERNATIONAL GROUP, LLP 12,557 61,000 0.30%
31 CITADEL ADVISORS LLC 12,297 60,000 0.29%
32 FIRST TRUST ADVISORS LP 10,000 48,000 0.23%
33 WOLVERINE ASSET MANAGEMENT LLC 4,400 21,000 0.10% Put
34 MORGAN STANLEY 3,254 16,000 0.08%
35 UBS Group AG 2,335 11,000 0.05%
36 BANK OF AMERICA CORP /DE/ 1,885 9,000 0.04%
37 Creative Planning 1,645 8,000 0.04%
38 CUTLER GROUP LLC / CA 1,361 6,000 0.03%
39 SEI INVESTMENTS CO 961 5,000 0.02%
40 FEDERATED HERMES, INC. 427 2,000 0.01%
41 Tower Research Capital LLC (TRC) 200 1,000 0.00%
42 BANK OF MONTREAL /CAN/ 264 1,000 0.00%
43 LADENBURG THALMANN FINANCIAL SERVICES INC. 261 1,000 0.00%
44 BRONFMAN E.L. ROTHSCHILD, L.P. 95 0 0.00%
45 GLENMEDE TRUST CO NA 41 0 0.00%
46 FIRST INTERSTATE BANK 6 0 0.00%
47 DEUTSCHE BANK AG\ 3 0 0.00%
48 MANUFACTURERS LIFE INSURANCE COMPANY, THE 47 0 0.00%
49 CUTLER GROUP LLC / CA 800 0 0.00% Put
50 Advisory Services Network, LLC 25 0 0.00%
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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.