5%+ stake
6.4%Stake
A Schedule 13G is filed by holders above 5% who say they will not try to influence the company. Index funds and large asset managers file most of them.
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BIIB · NASDAQ · Biotechnology
A Schedule 13G is filed by holders above 5% who say they will not try to influence the company. Index funds and large asset managers file most of them.
Institutions reporting a stake, Q2 2026
1,039
+27 vs Q1 2026
Share of stock reported
96.4%
142M of 148M shares outstanding
Change vs Q1 2026
+4.83M shares
109 new positions, 82 positions closed
Reported in 13F filings, which cover managers over $100M and include double counting. A 13F shows holdings on the last day of the quarter, not when shares were bought or sold. Change counts the 1,022 managers that reported both quarters.
Source: SEC Form 13F data sets, every filer, common stock only (options and bonds left out); 25 managers also reported puts and 29 managers calls. Amendments are applied; lines whose value was filed in thousands are scaled, and lines whose shares and value disagree are left out.