| Top Institutional Holders |
|---|
| Holder | Shares | % Out | Value* | Reported |
|---|
| FMR LLC | 15,845,113 | 8.58 | 303,909,267 | Dec 31, 2012 | | Vanguard Group, Inc. (The) | 9,620,949 | 5.21 | 173,946,757 | Mar 31, 2013 | | Artisan Partners Limited Partnership | 9,168,955 | 4.96 | 165,774,706 | Mar 31, 2013 | | Neuberger Berman Group, LLC | 5,339,368 | 2.89 | 96,535,773 | Mar 31, 2013 | | Price (T.Rowe) Associates Inc | 4,705,650 | 2.55 | 90,254,367 | Dec 31, 2012 | | Eagle Asset Management, Inc. | 4,398,150 | 2.38 | 79,518,552 | Mar 31, 2013 | | BlackRock Institutional Trust Company, N.A. | 4,358,278 | 2.36 | 78,797,666 | Mar 31, 2013 | | Columbia Wanger Asset Management, L.P. | 4,174,000 | 2.26 | 75,465,920 | Mar 31, 2013 | | Sectoral Asset Management, Inc. | 4,080,984 | 2.21 | 73,784,190 | Mar 31, 2013 | | JANUS CAPITAL MANAGEMENT, LLC | 3,958,516 | 2.14 | 71,569,969 | Mar 31, 2013 |
|
| Holder | Shares | % Out | Value* | Reported |
|---|
| Artisan Mid-Cap Fund | 3,694,300 | 2.00 | 70,856,674 | Dec 31, 2012 | | Columbia Acorn Fund | 3,600,000 | 1.95 | 69,048,000 | Dec 31, 2012 | | Vanguard Small-Cap Index Fund | 2,761,582 | 1.50 | 52,967,142 | Dec 31, 2012 | | Fidelity OTC Portfolio | 2,485,000 | 1.35 | 44,928,800 | Mar 31, 2013 | | Fidelity Select Portfolios - Biotechnology | 2,367,405 | 1.28 | 42,802,682 | Mar 31, 2013 | | Fidelity Contrafund Inc | 2,304,823 | 1.25 | 41,671,199 | Mar 31, 2013 | | Price (T.Rowe) Mid Cap Growth Fund | 2,250,000 | 1.22 | 40,680,000 | Mar 31, 2013 | | Vanguard Total Stock Market Index Fund | 2,222,293 | 1.20 | 42,623,579 | Dec 31, 2012 | | Vanguard Small-Cap Growth Index Fund | 1,941,201 | 1.05 | 37,232,235 | Dec 31, 2012 | | Waddell & Reed Advisors Funds-Science & Technology Fund | 1,936,900 | 1.05 | 35,019,152 | Mar 31, 2013 |
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View Transactions for Insiders & Institutional Holders Value shown is computed using the security's price on the report date given. Currency in USD. |
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