ImmunoGen Inc: Ownership

Ownership Information
Shares Outstanding 57.00 Mil
Institutional Ownership (%)43.56
Top 10 Institutions (%)26.50
Mutual Fund Ownership (%).71
5%/Insider Ownership (%)1.42
Float (%)98.58
Ownership Activity
Description# of HoldersShares
Total Positions 9924,830,378
New Positions190
Soldout Positions340
Net Position Change-121,902,317
Buyers526,535,773
Sellers64-4,633,456
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Institution Name Shs Held Shs Chg %Chg $Chg* %Out %Port Rpt Date
Biotechnology Value Fund, Inc. 2,870,072 -757,600 -20.9 -1,016,450 5.0 10.8 06-30-09
Barclays Global Investors, N.A. 2,710,030 129,946 5.0 5,041,863 4.7 0.0 06-30-09
Vanguard Group, Inc. 2,052,568 1,298,828 172.3 12,341,582 3.6 0.0 06-30-09
Granahan Investment Management, Inc. 1,279,870 390 0.0 -649,372 2.2 0.4 09-30-09
AllianceBernstein L.P. 1,168,736 1,086,801 1,326.4 9,492,766 2.0 0.0 06-30-09
Wellington Management Company, LLP 1,125,500 -131,749 -10.5 775,342 2.0 0.0 06-30-09
Kingdon Capital Management, L.L.C. 1,125,000 275,000 32.4 3,662,500 2.0 0.5 06-30-09
UBS Securities LLC 955,551 939,269 5,768.8 7,609,168 1.7 0.0 09-30-09
Renaissance Technologies Corp. 915,824 215,424 30.8 2,921,563 1.6 0.0 06-30-09
Dimensional Fund Advisors, LP 906,267 23,154 2.6 -262,609 1.6 0.0 09-30-09
State Street Global Advisors (US) 772,862 -64,263 -7.7 718,483 1.4 0.0 06-30-09
Gilder Gagnon Howe & Co. LLC 613,975 613,975 100.0 5,292,465 1.1 0.1 06-30-09
Millennium Management, L.L.C. 610,399 34,552 6.0 1,173,125 1.1 0.1 06-30-09
Emerald Advisers, Inc. 526,482 302,332 134.9 2,337,596 0.9 0.3 09-30-09
Invesco PowerShares Capital Management LLC 460,868 -391,731 -45.9 -2,080,771 0.8 0.0 06-30-09
*Category Headings:
Shs Held - shares held at report date
Shs Chg - position change within reporting period
%Chg - % change
$Chg - market value of the position change
%Out - % of shares outstanding
%Port - % Portfolio
Rpt Date - report date
Page generated 11/24/2009 9:19 PM Eastern Time