Abiomed Inc: Ownership

Ownership Information
Shares Outstanding 37.00 Mil
Institutional Ownership (%)50.68
Top 10 Institutions (%)32.80
Mutual Fund Ownership (%)2.73
5%/Insider Ownership (%)19.01
Float (%)80.99
Ownership Activity
Description# of HoldersShares
Total Positions 10018,753,324
New Positions160
Soldout Positions570
Net Position Change-45-5,960,877
Buyers481,793,256
Sellers93-7,754,133
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Institution Name Shs Held Shs Chg %Chg $Chg* %Out %Port Rpt Date
Waddell & Reed Investment Management Company 2,157,321 -100,500 -4.5 1,033,606 5.8 0.1 09-30-09
Barclays Global Investors, N.A. 1,937,930 93,039 5.0 2,545,361 5.2 0.0 09-30-09
PRIMECAP Management Company 1,542,273 270,500 21.3 3,758,433 4.1 0.0 09-30-09
Vanguard Group, Inc. 1,193,228 40,516 3.5 1,419,324 3.2 0.0 09-30-09
Capital Research Global Investors 1,160,680 -299,500 -20.5 -1,608,585 3.1 0.0 09-30-09
Portolan Capital Management, L.L.C. 1,148,873 -605,787 -34.5 -4,320,544 3.1 2.3 09-30-09
Great Point Partners, LLC 967,800 -630,000 -39.4 -4,695,258 2.6 6.9 09-30-09
Pioneer Investment Management, Inc. 742,900 121,800 19.6 1,735,457 2.0 0.0 09-30-09
Dimensional Fund Advisors, LP 671,557 -2,900 -0.4 572,107 1.8 0.0 09-30-09
State Street Global Advisors (US) 623,469 166,477 36.4 2,023,215 1.7 0.0 09-30-09
IronBridge Capital Management, L.P. 507,126 -14,409 -2.8 324,254 1.4 0.1 09-30-09
Rockefeller & Co., Inc. 489,580 0 0.0 435,726 1.3 0.2 09-30-09
Wall Street Associates, LLC 388,400 16,600 4.5 492,088 1.0 0.3 09-30-09
Delaware Investments 359,000 65,200 22.2 894,574 1.0 0.0 09-30-09
RMB Capital Management, LLC 329,253 1,975 0.6 310,455 0.9 0.5 09-30-09
*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 11/25/2009 9:40 AM Eastern Time