Alyeska Investment Group — BIIB Trade History
Quarter-by-quarter changes in the BIOGEN INC position · CUSIP 09062X103
Currently held · 1.3 YearsFirst seen: 2022 Q4
| Quarter | Filed | Activity | Shares | Δ Shares | Δ % | Value | % Port. |
|---|---|---|---|---|---|---|---|
| 2026 Q2 | 2026-08-14 | Add | 932,374 | 127,324 | +15.8% | $201.4M | 0.52% |
| 2026 Q1 | 2026-05-15 | Reduce | 805,050 | -219,218 | -21.4% | $147.6M | 0.42% |
| 2025 Q4 | 2026-02-13 | Add | 1,024,268 | 178,991 | +21.2% | $180.3M | 0.51% |
| 2025 Q3 | 2025-11-17 | Add | 845,277 | 336,504 | +66.1% | $118.4M | 0.36% |
| 2025 Q2 | 2025-08-14 | New | 508,773 | 508,773 | — | $63.9M | 0.23% |
| 2025 Q1 | 2025-05-15 | — | — | — | — | — | — |
| 2024 Q4 | 2025-02-14 | — | — | — | — | — | — |
| 2024 Q3 | 2024-11-14 | Sold out | — | -401,005 | -100.0% | — | — |
| 2024 Q2 | 2024-08-14 | Add | 401,005 | 234,312 | +140.6% | $93.0M | 0.53% |
| 2024 Q1 | 2024-05-15 | Reduce | 166,693 | -255,987 | -60.6% | $35.9M | 0.22% |
| 2023 Q4 | 2024-02-14 | Reduce | 422,680 | -19,396 | -4.4% | $109.4M | 0.72% |
| 2023 Q3 | 2023-11-14 | Add | 442,076 | 74,808 | +20.4% | $113.6M | 0.77% |
| 2023 Q2 | 2023-08-14 | New | 367,268 | 367,268 | — | $104.6M | 0.78% |
| 2023 Q1 | 2023-05-15 | Sold out | — | -25,064 | -100.0% | — | — |
| 2022 Q4 | 2023-02-14 | New | 25,064 | 25,064 | — | $6.9M | 0.07% |
| 2022 Q3 | 2022-11-14 | — | — | — | — | — | — |
| 2022 Q2 | 2022-08-15 | — | — | — | — | — | — |
| 2021 Q4 | 2022-05-19 | — | — | — | — | — | — |
| 2021 Q3 | 2022-05-19 | — | — | — | — | — | — |
| 2021 Q2 | 2022-05-19 | — | — | — | — | — | — |
| 2022 Q1 | 2022-05-17 | — | — | — | — | — | — |
| 2020 Q3 | 2021-08-24 | — | — | — | — | — | — |
| 2020 Q4 | 2021-08-24 | — | — | — | — | — | — |
| 2021 Q1 | 2021-08-24 | — | — | — | — | — | — |
| 2020 Q1 | 2021-02-24 | — | — | — | — | — | — |
| 2020 Q2 | 2021-02-24 | — | — | — | — | — | — |
| 2019 Q2 | 2020-08-18 | — | — | — | — | — | — |
| 2019 Q3 | 2020-08-18 | — | — | — | — | — | — |
| 2019 Q4 | 2020-08-18 | — | — | — | — | — | — |
| 2019 Q1 | 2020-05-22 | — | — | — | — | — | — |
| 2018 Q4 | 2020-05-22 | — | — | — | — | — | — |
| 2018 Q2 | 2019-05-21 | — | — | — | — | — | — |
| 2018 Q3 | 2019-05-21 | — | — | — | — | — | — |
| 2017 Q3 | 2019-02-21 | — | — | — | — | — | — |
| 2017 Q4 | 2019-02-21 | — | — | — | — | — | — |
| 2018 Q1 | 2019-02-21 | — | — | — | — | — | — |
| 2016 Q4 | 2018-08-20 | — | — | — | — | — | — |
| 2017 Q1 | 2018-08-20 | — | — | — | — | — | — |
| 2017 Q2 | 2018-08-20 | — | — | — | — | — | — |
| 2015 Q4 | 2017-08-17 | — | — | — | — | — | — |
Share counts are split-adjusted. Time held counts consecutive quarters ending with the latest filing; more than ten years shows as ">10 Years".
13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.