BIOGEN INC.
Institutional investors holding BIIB
| Investor | Weight | Quarter |
|---|---|---|
| Carl Icahn | 16.64% | 2007Q3 |
| Hillman Capital Management | 3.76% | 2026Q1 |
| Mason Hawkins | 3.14% | 2022Q1 |
| Michael Burry | 2.91% | 2018Q4 |
| Samantha McLemore | 2.55% | 2026Q1 |
| Viking Global Investors | 0.83% | 2017Q1 |
| Bill Miller | 0.66% | 2021Q2 |
| Sarah Ketterer | 0.63% | 2026Q1 |
| William Von Mueffling | 0.18% | 2004Q4 |
| Duan Yongping | 0.11% | 2020Q1 |
| Warren Buffett | 0.07% | 2021Q1 |
| First Eagle Investment Management | 0.05% | 2020Q2 |
| Kenneth Fisher | 0.02% | 2026Q1 |
| Meridian / ArrowMark | 0.01% | 2015Q2 |
| Christopher Davis | 0.00% | 2008Q2 |
| Richard Pzena | 0.00% | 2023Q2 |
| Mairs & Power | 0.00% | 2023Q4 |
| Dodge & Cox | 0.00% | 2008Q3 |
Congressional data coming soon
4
Total trades
$95K
Volume
0
Buys
2
Sells
Last trade: May 1, 2026
| Date | Insider | Type | Value |
|---|---|---|---|
| May 1, 2026 | Adam Keeney | Option | – |
| May 1, 2026 | Adam Keeney | Sell | $85K |
Congressional trade data is being sourced and will appear here shortly.
| Apr 1, 2026 |
| Adam Keeney |
| Option |
| – |
| Apr 1, 2026 | Adam Keeney | Sell | $10K |