Ownership Profile
Ownership Profile
Top Holders
| Holder | Shares Held | % O/S | Share Change | Filing Date |
|---|---|---|---|---|
| Fidelity Management & Research Company | 20,625,098 | 14.70 | 123,948 | 3/31/19 |
| The Vanguard Group, Inc. | 12,473,515 | 8.89 | 644,127 | 3/31/19 |
| Biogen Inc | 11,501,153 | 8.20 | 11,501,153 | 6/5/18 |
| ClearBridge Investments, LLC | 9,498,310 | 6.77 | -882,009 | 3/31/19 |
| Baillie Gifford & Co. | 8,644,351 | 6.16 | -105,663 | 3/31/19 |
| Bellevue Asset Management AG | 8,027,643 | 5.72 | -1,096,279 | 3/31/19 |
| Wellington Management Company, LLP | 7,539,076 | 5.37 | -87,929 | 3/31/19 |
| BlackRock Institutional Trust Company, N.A. | 6,981,110 | 4.98 | -69,907 | 3/31/19 |
| Ivy Investment Management Company | 3,362,306 | 2.40 | -135,756 | 3/31/19 |
| First Trust Advisors L.P. | 2,591,839 | 1.85 | 370,977 | 3/31/19 |
Top Holders: Mutual Funds
| Fund | Shares Held | % O/S | Share Change | Filing Date |
|---|---|---|---|---|
| BB Biotech Fd | 8,741,334 | 6.23 | 75,000 | 12/31/18 |
| Fidelity Growth Company Fund | 8,038,981 | 5.73 | 83,751 | 3/31/19 |
| Vanguard Total Stock Market Index Fund | 3,372,203 | 2.40 | 9,539 | 4/30/19 |
| Vanguard Small-Cap Index Fund | 3,234,881 | 2.31 | 22,307 | 4/30/19 |
| Ivy Science and Technology Fund | 3,090,626 | 2.20 | -126,900 | 3/31/19 |
| ClearBridge Aggressive Growth Fund | 2,547,745 | 1.82 | -175,000 | 3/31/19 |
| Fidelity Select Biotechnology Portfolio | 2,524,877 | 1.80 | -- | 3/31/19 |
| Vanguard Health Care Fund | 2,224,908 | 1.59 | 105,728 | 3/31/19 |
| Fidelity Series Growth Company Fund | 2,192,276 | 1.56 | 26,997 | 3/31/19 |
| Hartford MidCap Fund | 1,991,875 | 1.42 | -129,195 | 3/31/19 |
* Insider values reflect direct beneficial ownership.
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