Warren Buffett - Berkshire Hathaway
Holding/activity history for Biogen Inc. (BIIB)
| Period | Shares | % of Portfolio | Activity | % Change to Portfolio | Reported Price |
| 2021 Q2 | 0 | 0 | Sell 100.00% | 0.07 | |
| 2021 Q1 | 643,022 | 0.07 | $279.75 | ||
| 2020 Q4 | 643,022 | 0.06 | $244.86 | ||
| 2020 Q3 | 643,022 | 0.08 | $283.68 | ||
| 2020 Q2 | 643,022 | 0.08 | $267.55 | ||
| 2020 Q1 | 643,022 | 0.12 | Reduce 0.84% | 0.00 | $316.38 |
| 2019 Q4 | 648,447 | 0.08 | Buy | 0.08 | $296.73 |