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    ImmunoGen, Inc. (IMGN)

    -NasdaqGS
    8.52 Up 0.27(3.27%) Mar 30, 4:00PM EDT
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    Major HoldersGet Major Holders for:
    Breakdown
    % of Shares Held by All Insider and 5% Owners:0%
    % of Shares Held by Institutional & Mutual Fund Owners:91%
    % of Float Held by Institutional & Mutual Fund Owners:91%
    Number of Institutions Holding Shares:162

    Major Direct Holders (Forms 3 & 4)
    HolderSharesReported
    LAMBERT JOHN106,857Feb 3, 2014
    JUNIUS DANIEL M98,057Sep 19, 2014
    MORRIS CHARLES Q32,260Nov 28, 2014
    GREGORY RICHARD J.25,000Jan 5, 2015
    BARROWS CRAIG21,100May 5, 2014


    Top Institutional Holders
    HolderShares% OutValue*Reported
    Vanguard Group, Inc. (The)5,310,1806.1732,392,098Dec 31, 2014
    BB Biotech Ag3,240,8163.7619,768,977Dec 31, 2014
    BlackRock Fund Advisors3,180,2143.6919,399,305Dec 31, 2014
    State Street Corporation3,141,3123.6519,162,003Dec 31, 2014
    BlackRock Institutional Trust Company, N.A.2,424,6732.8214,790,505Dec 31, 2014
    Primecap Management Company12,127,07314.0873,975,145Dec 31, 2014
    ClearBridge Investments, LLC11,436,36413.2869,761,820Dec 31, 2014
    FMR, LLC9,416,64110.9457,441,510Dec 31, 2014
    Millennium Management LLC1,489,4351.739,085,553Dec 31, 2014
    Norges Bank Investment Management1,481,1531.729,035,033Dec 31, 2014

    Top Mutual Fund Holders
    HolderShares% OutValue*Reported
    Primecap Odyssey Growth Fund5,855,1006.8035,716,110Dec 31, 2014
    First Trust NYSE Arca Biotechnology Index Fund5,811,9986.7561,549,058Sep 30, 2014
    Fidelity Growth Company Fund3,937,5204.5730,043,277Jan 31, 2015
    Primecap Odyssey Aggressive Growth Fund3,769,8174.3822,995,883Dec 31, 2014
    SPDR (R) Ser Tr-SPDR (R) S&P (R) Biotech ETF1,688,7471.9610,301,356Dec 31, 2014
    Fidelity Select Portfolios - Biotechnology1,586,4571.8412,104,666Jan 31, 2015
    Vanguard Small-Cap Index Fund1,503,0801.759,168,788Dec 31, 2014
    Vanguard Total Stock Market Index Fund1,443,1101.688,802,971Dec 31, 2014
    iShares Russell 2000 ETF1,391,3561.6210,616,046Jan 31, 2015
    Vanguard Horizon Fund-Capital Opportunity Portfolio1,280,0001.497,808,000Dec 31, 2014

    View Transactions for Insiders & Institutional Holders

    Value shown is computed using the security's price on the report date given.

    Currency in USD.