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BIOGEN INC. (BIIB) Ownership Summary
Institutional Holders
Total Number of Holders 1,051
% of Shares Outstanding 88.46%
Total Shares Held 128,846,400
Total Value of Holdings $25,458,760,176.00
Net Activity (1,048,921)
 
Top 5 Holders Shares Held Shares Changed
VANGUARD GROUP INC 16,600,163 29,765
PRIMECAP MANAGEMENT CO/CA/ 16,338,294 117,578
BLACKROCK INC. 14,538,497 393,509
STATE STREET CORP 7,096,018 349,010
T. ROWE PRICE INVESTMENT MANAGEMENT, INC. 5,678,859 508,889

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Insider Trades
 Last 3 mos.Last 12 mos.
Number of Insider Trades18
Number of Buys01
Number of Sells17
Net Activity (431) (1,602)
 
Top 5 TradesShares Traded Date
SINGHAL PRIYA4319/3/2024
SINGHAL PRIYA1,6688/30/2024
SINGHAL PRIYA8078/30/2024
DORSA CAROLINE1,7856/21/2024
FREIRE MARIA C1,3406/21/2024

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5% Ownership (SC 13D & SC 13G Filings)
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View Filing in HTMLView Filing in RTFView Filing in PDFView Filing in ExcelView Filing in Original Format  SC 13G/A   BLACKROCK INC.  08/07/24   File this document to a folder.
View Filing in HTMLView Filing in RTFView Filing in PDFView Filing in ExcelView Filing in Original Format  SC 13G/A   PRIMECAP MANAGEMENT CO/CA/  02/12/24   File this document to a folder.
View Filing in HTMLView Filing in RTFView Filing in PDFView Filing in ExcelView Filing in Original Format  SC 13G/A   VANGUARD GROUP INC  02/12/24   File this document to a folder.
View Filing in HTMLView Filing in RTFView Filing in PDFView Filing in ExcelView Filing in Original Format  SC 13G/A   VANGUARD GROUP INC  02/12/24   File this document to a folder.
View Filing in HTMLView Filing in RTFView Filing in PDFView Filing in ExcelView Filing in Original Format  SC 13G/A   BLACKROCK INC.  01/24/24   File this document to a folder.