ATMI Inc: Ownership

Ownership Information
Shares Outstanding 31.00 Mil
Institutional Ownership (%)90.01
Top 10 Institutions (%)47.70
Mutual Fund Ownership (%)2.58
5%/Insider Ownership (%)1.54
Float (%)98.46
Ownership Activity
Description# of HoldersShares
Total Positions 12527,903,868
New Positions200
Soldout Positions660
Net Position Change-38-6,441,599
Buyers683,574,165
Sellers106-10,015,764
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Institution Name Shs Held Shs Chg %Chg $Chg* %Out %Port Rpt Date
Fidelity Management & Research 3,185,224 374,261 13.3 14,157,561 10.2 0.0 09-30-09
BlackRock Institutional Trust Company, N.A. 2,102,272 138,157 7.0 7,653,531 6.7 0.0 09-30-09
Vanguard Group, Inc. 1,370,000 25,791 1.9 3,989,934 4.4 0.0 09-30-09
Jennison Associates LLC 1,335,948 -24,857 -1.8 3,114,154 4.3 0.0 09-30-09
Westfield Capital Management Company, LP 1,206,884 108,368 9.9 4,844,992 3.8 0.2 09-30-09
Evergreen Investment Management Company, LLC 1,166,484 205,132 21.3 6,241,888 3.7 0.1 09-30-09
T. Rowe Price Associates, Inc. 1,152,600 63,100 5.8 3,999,755 3.7 0.0 09-30-09
Kalmar Investments Inc. 1,147,969 -327,312 -22.2 -5,401,167 3.7 0.7 12-31-09
Frontier Capital Management Company, LLC 1,090,816 -186,020 -14.6 -30,953 3.5 0.3 09-30-09
Artisan Partners Limited Partnership 1,016,500 -667,400 -39.6 -7,701,492 3.2 0.1 09-30-09
Cortina Asset Management L.L.C. 991,062 267,972 37.1 6,758,187 3.2 1.5 09-30-09
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 837,850 -10,900 -1.3 195,955 2.7 0.8 12-31-09
State Street Global Advisors (US) 699,572 153,664 28.1 4,219,281 2.2 0.0 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 2/10/2010 11:00 AM Eastern Time