ATMI Inc: Ownership

Ownership Information
Shares Outstanding 31.00 Mil
Institutional Ownership (%)91.55
Top 10 Institutions (%)44.60
Mutual Fund Ownership (%)1.84
5%/Insider Ownership (%)1.54
Float (%)98.46
Ownership Activity
Description# of HoldersShares
Total Positions 12528,381,238
New Positions150
Soldout Positions680
Net Position Change-53-6,213,041
Buyers613,345,287
Sellers114-9,558,328
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Institution Name Shs Held Shs Chg %Chg $Chg* %Out %Port Rpt Date
Barclays Global Investors, N.A. 1,964,115 2,877 0.1 240,804 6.3 0.0 06-30-09
Artisan Partners Limited Partnership 1,683,900 25,300 1.5 558,769 5.4 0.1 06-30-09
Wells Capital Management Inc. 1,626,524 -382 0.0 156,758 5.2 0.1 06-30-09
Kalmar Investments Inc. 1,475,281 -8,222 -0.6 3,737,548 4.7 0.9 09-30-09
Jennison Associates LLC 1,360,805 -127,608 -8.6 -1,832,911 4.3 0.0 06-30-09
Vanguard Group, Inc. 1,344,209 -21,833 -1.6 -202,462 4.3 0.0 06-30-09
Westfield Capital Management Company, LP 1,206,884 108,368 9.9 4,844,992 3.8 0.2 09-30-09
Frontier Capital Management Company, LLC 1,090,816 -186,020 -14.6 -30,953 3.5 0.3 09-30-09
T. Rowe Price Associates, Inc. 1,089,500 -44,100 -3.9 -571,513 3.5 0.0 06-30-09
Cortina Asset Management L.L.C. 991,062 267,972 37.1 6,758,187 3.2 1.5 09-30-09
Evergreen Investment Management Company, LLC 961,352 64,198 7.2 1,086,711 3.1 0.1 06-30-09
Columbia Management Advisors, LLC 887,787 -86,522 -8.9 982,315 2.8 0.0 09-30-09
UBS O'Connor, L.L.C. 880,000 603,000 217.7 11,670,190 2.8 0.4 09-30-09
Investment Counselors of Maryland, LLC 848,750 56,900 7.2 3,107,383 2.7 0.8 09-30-09
The Boston Company Asset Management, LLC 805,450 -7,947 -1.0 1,986,863 2.6 0.1 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 8:00 AM Eastern Time