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IMMUNOGEN INCORPORATED
IMMUNOGEN INCORPORATED. Institutional holdings reported to the SEC.

Institutional Holders (2014Q1)
Portfolio Summary: 149 Institutional holders with a total value of $1,137,108,895.
#
Manager Name
Shares
Value ($)
%
Options
Notes
1 PRIMECAP MANAGEMENT CO/CA/ 12,675,427 189,244,000 16.64%
2 FMR LLC 12,188,461 181,973,000 16.00%
3 Clearbridge Investments, LLC 9,298,289 138,823,000 12.21%
4 VANGUARD GROUP INC 5,243,545 78,286,000 6.88%
5 SECTORAL ASSET MANAGEMENT INC 3,623,786 54,103,000 4.76%
6 FIRST TRUST ADVISORS LP 3,608,918 53,881,000 4.74%
7 BlackRock Fund Advisors 3,185,688 47,562,000 4.18%
8 BB BIOTECH AG 3,165,816 47,266,000 4.16%
9 WELLINGTON MANAGEMENT GROUP LLP 3,126,551 46,679,000 4.11%
10 STATE STREET CORP 2,611,643 38,993,000 3.43%
11 BlackRock Institutional Trust Company, N.A. 2,470,653 36,887,000 3.24%
12 NORGES BANK 1,608,562 24,017,000 2.11%
13 Artal Group S.A. 1,300,000 19,409,000 1.71%
14 NORTHERN TRUST CORP 1,158,722 17,300,000 1.52%
15 Invesco Ltd. 733,259 10,948,000 0.96%
16 WELLS FARGO & COMPANY/MN 699,783 10,448,000 0.92%
17 Granahan Investment Management, LLC 540,641 8,072,000 0.71%
18 GEODE CAPITAL MANAGEMENT, LLC 480,420 7,172,000 0.63%
19 Bank of New York Mellon Corp 435,771 6,506,000 0.57%
20 DEUTSCHE BANK AG\ 362,827 5,416,000 0.48%
21 Artal Group S.A. 350,000 5,226,000 0.46% Call
22 TIAA CREF INVESTMENT MANAGEMENT LLC 346,028 5,166,000 0.45%
23 MANAGED ACCOUNT ADVISORS LLC 325,685 4,863,000 0.43%
24 MORGAN STANLEY 317,128 4,735,000 0.42%
25 MACQUARIE GROUP LTD 268,077 4,002,000 0.35%
26 GUGGENHEIM CAPITAL LLC 249,520 3,726,000 0.33%
27 BlackRock Investment Management, LLC 246,462 3,680,000 0.32%
28 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 233,055 3,480,000 0.31%
29 RAYMOND JAMES & ASSOCIATES 222,239 3,318,000 0.29%
30 PRUDENTIAL FINANCIAL INC 212,532 3,173,000 0.28%
31 PICTET ASSET MANAGEMENT LTD 206,950 3,090,000 0.27%
32 SUSQUEHANNA INTERNATIONAL GROUP, LLP 185,900 2,775,000 0.24% Put
33 ALLIANCEBERNSTEIN L.P. 167,451 2,500,000 0.22%
34 CREDIT SUISSE AG/ 165,210 2,466,000 0.22%
35 MASON STREET ADVISORS, LLC 154,800 2,311,000 0.20%
36 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 153,636 2,294,000 0.20%
37 SUSQUEHANNA INTERNATIONAL GROUP, LLP 152,700 2,280,000 0.20% Call
38 ProShare Advisors LLC 151,141 2,257,000 0.20%
39 TWIN FOCUS CAPITAL PARTNERS, LLC 140,000 2,090,000 0.18%
40 CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM 136,000 1,882,000 0.17%
41 SUSQUEHANNA INTERNATIONAL GROUP, LLP 125,654 1,876,000 0.16%
42 TEACHERS ADVISORS, LLC 122,861 1,834,000 0.16%
43 UNITED SERVICES AUTOMOBILE ASSOCIATION 114,050 1,703,000 0.15%
44 BARCLAYS PLC 110,037 1,540,000 0.14%
45 RHUMBLINE ADVISERS 100,037 1,494,000 0.13%
46 MILLENNIUM MANAGEMENT LLC 100,000 1,493,000 0.13%
47 Nationwide Fund Advisors 99,914 1,492,000 0.13%
48 CITADEL ADVISORS LLC 97,943 1,462,000 0.13%
49 Swiss National Bank 95,800 1,430,000 0.13%
50 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 86,311 1,289,000 0.11%
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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.