InvestorLens

BIIB — BIOGEN INC

Health Care

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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About BIOGEN INC (BIIB)

BIOGEN INC (BIIB) appears in the most recent 13F filings of 5 tracked institutional investors. BIOGEN INC is classified in the Health Care sector. The largest disclosed position is held by Steve Cohen (Point72 Asset Management), valued at $671M. Across recent filings, tracked investors recorded 9 new positions, 0 increased, 0 reduced, and 1 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in BIIB

90
/100
Strong Institutional Accumulation
Added / Increased9
Reduced0
Exited1
BearishBullish
Crowded Trade Score™

How many top investors track BIIB

33
/100
Emerging Interest
5investors

A small number of top investors own this.

UndiscoveredCrowded
151015+

BIIB Ownership Composition

How BIOGEN INC is held across tracked investor types, based on reported 13F positions.

Dominant Type
Hedge Funds
50% of tracked value
Institutions
5
tracked investors
Total Reported
$298.4M
combined 13F value
Sectors2
  • Hedge Funds50.0%
  • Other50.0%
Hedge Funds(1)
50.0%
Other(4)
50.0%

Tracked investors reporting BIIB

  • Steve CohenMar 31, 2026
    Point72 Asset Management
    Shares
    814.3K
    Value
    $149.3M
    % Portfolio
    0.19%
  • Izzy EnglanderMar 31, 2026
    Millennium Management
    Shares
    281.8K
    Value
    $51.7M
    % Portfolio
    0.02%
  • Ken GriffinMar 31, 2026
    Citadel Advisors
    Shares
    530.7K
    Value
    $97.3M
    % Portfolio
    0.02%
  • Paul Tudor JonesMar 31, 2026
    Tudor Investment Corp
    Shares
    1.1K
    Value
    $201.7K
    % Portfolio
    0.00%
  • Ray DalioSep 30, 2025
    Bridgewater Associates
    Shares
    40K
    Value
    $5.6K
    % Portfolio
    0.00%

Recent activity

Frequently asked questions

How many institutional investors hold BIIB?
5 tracked institutional investors disclosed a position in BIIB (BIOGEN INC) in their most recent 13F filing.
Who is the largest institutional holder of BIIB?
Steve Cohen, Point72 Asset Management, holds the largest disclosed position in BIIB, valued at $671M.
Did institutional ownership of BIIB increase or decrease?
Across recent 13F filings, tracked investors recorded 9 new positions, 0 increased, 0 reduced, and 1 fully exited BIIB.
What sector is BIIB in?
BIOGEN INC is classified in the Health Care GICS sector.
Where does this BIIB ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.
BIIB (BIOGEN INC) — Institutional Holders & 13F History — InvestorLens