Ownership Profile
| Holders | Values ($) | % O/S | Shares | |
| Institution | 154 | 596,625,011.00 | 62.80 | 68,030,218 |
| Mutual Fund | 221 | 304,334,827.00 | 32.03 | 34,701,805 |
| Holders | Values Change ($) | % O/S | Shares Change | |
| Buyers | 104 | 142,451,472.00 | 38.63 | 16,243,041 |
| Sellers | 39 | -88,544,543.00 | 13.76 | -10,096,299 |
| Net | -- | 53,906,929.00 | 24.87 | 6,146,742 |
| Values ($) | % O/S | Shares | |
| Top 10 Inst. | 431,272,336 | 45.39 | 49,175,865 |
| Top 20 Inst. | 507,722,363.00 | 53.44 | 57,893,086 |
| Top 50 Inst. | 569,065,235.00 | 59.90 | 64,887,712 |
| Total Inst. | 596,625,011.00 | 62.80 | 68,030,218 |
| Holders | Values ($) | % O/S | Shares | |
| GARP | 77 | 163,364,812 | 27.38 | 18,627,687 |
| Growth | 27 | 128,542,768 | 21.54 | 14,657,100 |
| Value | 24 | 89,390,435 | 14.98 | 10,192,752 |
| Aggressive Growth | 16 | 119,569,865 | 20.04 | 13,633,964 |
| Index | 7 | 94,335,865 | 15.81 | 10,756,655 |
| Yield | 3 | 1,421,266 | 0.24 | 162,060 |
| Shares Held | % O/S | Shares Change | Filing Date | |
| Brookside Capital LLC | 10,987,500 | 10.14 | 0 | 03/31/2012 |
| The Baupost Group LLC | 8,249,000 | 7.62 | 2,584,000 | 03/31/2012 |
| T. Rowe Price Associates, Inc. | 7,250,302 | 6.69 | -1,085,700 | 03/31/2012 |
| Fidelity Management & Research Co. | 7,056,995 | 6.51 | 1,307,486 | 03/31/2012 |
| The Vanguard Group, Inc. | 4,075,159 | 3.76 | 534,316 | 03/31/2012 |
| BlackRock Fund Advisors | 3,833,719 | 3.54 | 944,543 | 03/31/2012 |
| State Street Global Advisors | 2,543,038 | 2.35 | 1,028,208 | 03/31/2012 |
| Capital World Investors | 2,300,000 | 2.12 | 551,800 | 03/31/2012 |
| Columbia Management Investment Advisers LLC | 1,444,301 | 1.33 | 260,401 | 03/31/2012 |
| D. E. Shaw & Co., Inc. | 1,435,851 | 1.33 | -516,981 | 03/31/2012 |
| Bellevue Asset Management AG | 1,400,000 | 1.29 | -1,082,308 | 03/31/2012 |
| Westfield Capital Management Co. LP | 1,317,485 | 1.22 | -1,385,950 | 03/31/2012 |
| Oxford Asset Management LLP | 1,225,885 | 1.13 | 857,967 | 03/31/2012 |
| Federated Investment Management Co. | 1,084,000 | 1.00 | 891,400 | 03/31/2012 |
| Northern Trust Investments | 849,711 | 0.78 | 1,229 | 03/31/2012 |
| Loomis, Sayles & Co. LP | 793,428 | 0.73 | 793,428 | 03/31/2012 |
Ownership data is provided by FactSet, a third party service, and Idenix Pharmaceuticals, Inc. does not maintain or provide information directly to this service.
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