Symbol
BIIB on Nasdaq
Investment type
Equity / COMMON STOCK
Latest Disclosed Shares Owned
14,954,697 shares
Security Ownership %
10%
Shares, Excluding Options vs Price
Value, Excluding Options

PRIMECAP MANAGEMENT CO/CA/ ownership in BIOGEN INC. COMMON STOCK (BIIB)

13 Nov 2025 - PRIMECAP MANAGEMENT CO/CA/ has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 14,954,697 shares of BIOGEN INC. COMMON STOCK (BIIB). This represents 10% ownership of the company. This is the first filing by PRIMECAP MANAGEMENT CO/CA/ disclosing ownership of BIOGEN INC. COMMON STOCK (BIIB).
* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.