Quick Takeaways
- PRIMECAP MANAGEMENT CO/CA/ filed SCHEDULE 13G/A for Biogen Inc. COM (BIIB).
- Disclosed ownership: 10%.
- Date of event: 30 Sep 2025.
PRIMECAP MANAGEMENT CO/CA/ - 30 Sep 2025 SCHEDULE 13G/A Report for Biogen Inc. COM (BIIB)
- Filing Manager
- PRIMECAP MANAGEMENT CO/CA/
- Reporting Manager
- PRIMECAP MANAGEMENT CO/CA/
- Security
- Biogen Inc. COM
- Symbol
- BIIB
- Shares outstanding
- 146,614,676 shares
- Disclosed Ownership
- 14,954,697 shares
- Ownership
- 10%
- Form type
- SCHEDULE 13G/A
- Filing time
- 13 Nov 2025, 20:28:22 UTC
- Date of event
- 30 Sep 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"PRIMECAP MANAGEMENT CO/CA/ disclosed 10% ownership in Biogen Inc. COM (BIIB) on 30 Sep 2025."
What Changed
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 13 Nov 2025, 20:28.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Official SEC Source
Backed by Schedule 13D/13G
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
See Original FilingReporting Managers (1)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| PRIMECAP MANAGEMENT CO/CA/ | 10% | 14,954,697 | 14,859,187 | 0 | Jorge A. Rodriguez | Deputy Chief Compliance Officer |