BIOGEN INC (BIIB) Institutional Ownership

BIIB is currently held by 4 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $96.00M based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026.

The largest disclosed holder is Causeway Capital Management, which reported ownership valued at approximately $51.48M in its March 31, 2026 13F filing. Based on current market prices and the latest disclosed share count, Causeway Capital Management's BIIB position is now estimated to be worth approximately $55.37M, representing an estimated gain of +7.56% since the filing period.

Major shareholders tracked on this page include Causeway Capital Management, Renaissance Technologies LLC, Hillman Value Fund, and other prominent asset managers. Collectively, these investors account for approximately 100% of the total disclosed value among the investors covered in this analysis.

This page tracks institutional ownership trends, hedge fund exposure, portfolio concentration, historical 13F filings, and estimated holding performance to help investors analyze smart money sentiment toward BIOGEN INC (BIIB).

Institutional Ownership Trend

Portfolio quarterInstitutional holdersTotal reported valueTotal shares
Q1 20264$96,004,735523,672
Q4 20254$169,192,680961,377
Q3 20254$221,238,6421,579,374
Q2 20254$199,055,0281,584,960
Q1 20254$175,848,2941,285,065
Q4 20244$232,438,4201,520,000
Q3 20244$262,026,6831,351,768
Q2 20244$235,849,9261,017,384
Q1 20244$86,200,1851,283,579
Q4 20235$103,403,0971,157,442
Q3 20235$102,579,7331,484,438
Q2 20236$97,125,1731,449,397

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