Avidity Partners Management LP
- SEC CIK
- 0001791827
- Latest filing
- Aug 14, 2026
BIIB holding history
Biogen Inc. in every 13F filed by Avidity Partners Management LP, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.
BIIB overviewAll 13F holders of BIIBFull Q2 2026 holdings
- Shares (Q4 2023)
- 0
- Sold out in Q4 2023
- Value
- $0
- % of portfolio
- 0.0%
- Quarters held
- 7
- Since Q2 2021
| Quarter | Shares | Value | % of portfolio | Share change | Action | All holders |
|---|---|---|---|---|---|---|
| Q4 2023 | 0 | $0 | 0.0% | −115,400−100.0% | Sold out | Holders |
| Q3 2023 | 115,400 | $29.7M | 1.2% | −58,600−33.7% | Reduced | Holders |
| Q2 2023 | 174,000 | $49.6M | 1.7% | +45,200+35.1% | Added | Holders |
| Q1 2023 | 128,800 | $35.8M | 1.2% | +128,800 | New | Holders |
| Q4 2022 | 0 | $0 | 0.0% | −600,000−100.0% | Sold out | Holders |
| Q3 2022 | 600,000 | $160.2M | 3.5% | +159,434+36.2% | Added | Holders |
| Q2 2022 | 440,566 | $89.8M | 2.1% | +75,566+20.7% | Added | Holders |
| Q1 2022 | 365,000 | $76.9M | 1.7% | +365,000 | New | Holders |
| Q3 2021 | 0 | $0 | 0.0% | −183,900−100.0% | Sold out | Holders |
| Q2 2021 | 183,900 | $63.7M | 1.7% | +183,900 | New | Holders |