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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 Invesco Ltd. 32,018,024 34,261,000 33.27%
2 BlackRock Fund Advisors 8,008,356 8,569,000 8.32%
3 VANGUARD GROUP INC 6,652,170 7,119,000 6.91%
4 WELLS FARGO & COMPANY/MN 5,208,028 5,573,000 5.41%
5 DIMENSIONAL FUND ADVISORS LP 4,529,738 4,847,000 4.71%
6 BlackRock Institutional Trust Company, N.A. 3,484,648 3,729,000 3.62%
7 Neuberger Berman Group LLC 3,231,906 3,458,000 3.36%
8 STATE STREET CORP 2,569,918 2,748,000 2.67%
9 RENAISSANCE TECHNOLOGIES LLC 2,460,489 2,633,000 2.56%
10 NORGES BANK 2,190,362 2,344,000 2.28%
11 Bank of New York Mellon Corp 1,570,320 1,681,000 1.63%
12 PUTNAM INVESTMENTS LLC 1,480,725 1,584,000 1.54%
13 PANAGORA ASSET MANAGEMENT INC 1,452,339 1,554,000 1.51%
14 NORTHERN TRUST CORP 1,410,333 1,509,000 1.47%
15 MCKINLEY CAPITAL MANAGEMENT LLC 1,222,591 1,308,000 1.27%
16 TIAA CREF INVESTMENT MANAGEMENT LLC 1,168,115 1,250,000 1.21%
17 ROYCE & ASSOCIATES LP 1,078,200 1,154,000 1.12%
18 JPMORGAN CHASE & CO 878,133 939,000 0.91%
19 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 819,600 877,000 0.85%
20 GEODE CAPITAL MANAGEMENT, LLC 794,639 849,000 0.82%
21 Counsel Portfolio Services Inc. 791,037 846,000 0.82%
22 PRINCIPAL FINANCIAL GROUP INC 782,499 837,000 0.81%
23 AMERIPRISE FINANCIAL INC 599,708 641,000 0.62%
24 GUGGENHEIM CAPITAL LLC 594,158 636,000 0.62%
25 DEUTSCHE BANK AG\ 582,464 622,000 0.60%
26 Sterling Capital Management LLC 577,030 617,000 0.60%
27 BlackRock Investment Management, LLC 568,730 609,000 0.59%
28 CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM 558,300 597,000 0.58%
29 MILLENNIUM MANAGEMENT LLC 510,416 546,000 0.53%
30 PARAMETRIC PORTFOLIO ASSOCIATES LLC 482,546 516,000 0.50%
31 NEW YORK STATE TEACHERS RETIREMENT SYSTEM 405,582 434,000 0.42%
32 State of New Jersey Common Pension Fund D 310,000 332,000 0.32%
33 GOLDMAN SACHS GROUP INC 306,751 328,000 0.32%
34 NEW YORK STATE COMMON RETIREMENT FUND 290,111 310,000 0.30%
35 TEACHERS ADVISORS, LLC 287,783 308,000 0.30%
36 PRUDENTIAL FINANCIAL INC 284,704 305,000 0.30%
37 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 257,692 276,000 0.27%
38 COMERICA BANK 258,334 276,000 0.27%
39 TFS CAPITAL LLC 230,907 247,000 0.24%
40 STRS OHIO 220,800 236,000 0.23%
41 RHUMBLINE ADVISERS 210,606 225,000 0.22%
42 OFI Advisors LLC 201,696 216,000 0.21%
43 PUBLIC SECTOR PENSION INVESTMENT BOARD 199,167 213,000 0.21%
44 BlackRock Group LTD 198,794 213,000 0.21%
45 ALLIANCEBERNSTEIN L.P. 198,600 213,000 0.21%
46 WELLINGTON MANAGEMENT GROUP LLP 198,356 212,000 0.21%
47 AQR CAPITAL MANAGEMENT LLC 197,733 211,000 0.20%
48 Spark Investment Management LLC 196,100 209,000 0.20%
49 BRIDGEWAY CAPITAL MANAGEMENT, LLC 190,000 203,000 0.20%
50 Vident Investment Advisory, LLC 171,522 184,000 0.18%
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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.