| Top Institutional Holders |
|---|
| Holder | Shares | % Out | Value* | Reported |
|---|
| Vanguard Group, Inc. (The) | 9,436,742 | 4.94 | 207,891,426 | Mar 31, 2013 | | Maverick Capital Ltd. | 8,954,954 | 4.68 | 197,277,636 | Mar 31, 2013 | | Systematic Financial Management, L.P. | 5,518,574 | 2.89 | 121,574,185 | Mar 31, 2013 | | BlackRock Institutional Trust Company, N.A. | 5,480,673 | 2.87 | 120,739,226 | Mar 31, 2013 | | State Street Corporation | 5,465,587 | 2.86 | 120,406,881 | Mar 31, 2013 | | Ameriprise Financial, Inc. | 5,339,446 | 2.79 | 117,627,995 | Mar 31, 2013 | | Oppenheimer Funds, Inc. | 5,126,815 | 2.68 | 112,943,734 | Mar 31, 2013 | | UBS Global Asset Management (Americas) Inc | 5,036,637 | 2.63 | 110,957,113 | Mar 31, 2013 | | BlackRock Fund Advisors | 4,653,928 | 2.43 | 102,526,033 | Mar 31, 2013 | | FMR, LLC | 22,499,629 | 11.77 | 495,666,826 | Mar 31, 2013 |
|
| Holder | Shares | % Out | Value* | Reported |
|---|
| Fidelity Magellan Fund Inc | 3,369,300 | 1.76 | 74,225,679 | Mar 31, 2013 | | Munder Mid-Cap Core Growth Fund | 3,171,300 | 1.66 | 64,377,390 | Dec 31, 2012 | | Vanguard Total Stock Market Index Fund | 2,549,738 | 1.33 | 51,759,681 | Dec 31, 2012 | | Vanguard Mid-Cap Index Fund | 2,491,991 | 1.30 | 50,587,417 | Dec 31, 2012 | | iShares Core S&P Midcap Index Fund | 2,169,529 | 1.13 | 47,794,723 | Mar 31, 2013 | | Variable Insurance Products Fund III-Mid-Cap Portfolio | 1,828,963 | 0.96 | 40,292,054 | Mar 31, 2013 | | Fidelity Select Portfolios - Electronics | 1,755,448 | 0.92 | 38,672,519 | Mar 31, 2013 | | SPDR S&P Mid Cap 400 ETF Trust | 1,743,664 | 0.91 | 38,412,917 | Mar 31, 2013 | | Fidelity Growth Company Fund | 1,625,000 | 0.85 | 35,798,750 | Mar 31, 2013 | | Vanguard Extended Market Index Fund | 1,586,170 | 0.83 | 32,199,251 | Dec 31, 2012 |
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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. |