| Top Holders
| | | Shares Held | % O/S | Share Change | Filing Date | | Fidelity Management & Research Company | 20,837,335 | 8.7 | -70,981 | 12/31/12 | | Jennison Associates LLC | 13,243,168 | 5.5 | -254,708 | 03/31/13 | | The Vanguard Group, Inc. | 10,952,365 | 4.6 | 332,263 | 03/31/13 | | BlackRock Institutional Trust Company, N.A. | 9,837,698 | 4.1 | 1,524,401 | 03/31/13 | | State Street Global Advisors (US) | 9,495,779 | 4.0 | -48,673 | 03/31/13 | | Brown Advisory | 7,241,026 | 3.0 | 2,010,542 | 03/31/13 | | Columbia Management Investment Advisers, LLC | 5,678,082 | 2.4 | -494,335 | 03/31/13 | | American Century Investment Management, Inc. | 5,629,128 | 2.4 | 789,582 | 03/31/13 | | Winslow Capital Management, LLC | 4,877,275 | 2.0 | -719,377 | 03/31/13 | | UBS Global Asset Management (Americas), Inc. | 4,454,762 | 1.9 | -791,627 | 03/31/13 |
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