BIOGEN INC (BIIB) Institutional Ownership and Insiders Activity

BIOGEN INC (BIIB) is widely held by institutional investors, with 4 tracked firms reporting positions valued at approximately $96.21M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Causeway Capital Management is the largest disclosed holder, reporting approximately $51.48M in BIIB holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Causeway Capital Management representing the majority of disclosed value.

Recent insider activity includes 10 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.