Which hedge funds own BIIB? BIOGEN INC, Q2 2026 13F holders
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10 of the hedge funds tracked by WhaleCreep disclosed a position in BIIB (BIOGEN INC) in their Q2 2026 13F filings, worth $186.3m in total. The largest holder by portfolio weight is Farallon Capital Management at 0.1% of its book. 2 managers opened a new position this quarter: Farallon Capital Management, D. E. Shaw & Co. 1 exited: Glenview Capital Management.
10tracked managers holding
2opened this quarter
1exited this quarter
Which hedge funds hold BIIB? Current holders by portfolio weight
| Manager | As of | Weight of book | Value | Shares | Δ shares | Action |
|---|---|---|---|---|---|---|
| Farallon Capital Management | Q2 2026 | 0.1% | $15.3m | 71,000 | – | new |
| Woodline Partners | Q2 2026 | 0.1% | $24.3m | 112,463 | 3% | added |
| Citadel Advisors | Q2 2026 | 0.1% | $90.4m | 418,356 | 203% | added |
| Point72 Asset Management LP | Q2 2026 | 0.0% | $19.0m | 88,149 | -89% | reduced |
| Renaissance Technologies LLC | Q2 2026 | 0.0% | $16.8m | 77,744 | -62% | reduced |
| D. E. Shaw & Co | Q2 2026 | 0.0% | $16.1m | 74,438 | – | new |
| Horizon Kinetics | Q2 2026 | 0.0% | $589.0k | 2,726 | -5% | reduced |
| Holocene Advisors | Q2 2026 | 0.0% | $1.0m | 4,793 | 0% | held |
| Marshall Wace | Q2 2026 | 0.0% | $2.7m | 12,595 | -95% | reduced |
| Ancora Advisors | Q2 2026 | 0.0% | $8.4k | 39 | -83% | reduced |
Exited since the previous quarter
| Manager | Prior weight | Prior value |
|---|---|---|
| Glenview Capital Management | 2.5% | $10.5m |
Held in a manager's last filing on record
These managers have not filed for the latest quarter; their last disclosure is dated.
| Manager | Last filing | Weight |
|---|---|---|
| Icahn Capital | Q1 2011 | 22.7% |
How has hedge fund ownership of BIIB changed?
| Quarter | Managers holding | Combined value |
|---|---|---|
| Q2 2026 | 10 | $186.3m |
| Q1 2026 | 10 | $302.3m |
| Q4 2025 | 7 | $658.3m |
| Q3 2025 | 8 | $721.6m |
| Q2 2025 | 7 | $644.7m |
| Q1 2025 | 6 | $214.4m |
| Q4 2024 | 7 | $228.0m |
| Q3 2024 | 8 | $461.0m |
| Q2 2024 | 7 | $396.2m |
| Q1 2024 | 8 | $388.0m |
| Q4 2023 | 10 | $428.4m |
| Q3 2023 | 9 | $513.3m |
| Q2 2023 | 12 | $906.7m |
| Q1 2023 | 13 | $1.0bn |
| Q4 2022 | 12 | $985.5m |
| Q3 2022 | 12 | $1.3bn |
Counts every tracked manager that disclosed BIIB in that quarter's filing, including managers that have since stopped filing.