BIOGEN INC (BIIB) Institutional Ownership Changes & 13F Activity

BIOGEN INC (BIIB). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Causeway Capital Management, Renaissance Technologies LLC, Hillman Value Fund, Sequoia Financial Advisors, and Parnassus Endeavor Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2014Eagle Capital ManagementBuy528,606$2,921
Q4 2014Mairs & Power Growth FundSell-301,140$387
Q3 2014Renaissance Technologies LLCSell-36,60092,661$30,653
Q3 2014Eagle Capital ManagementSell-1838,554$2,830
Q3 2014Mairs & Power Growth FundBuy451,170$387
Q2 2014Renaissance Technologies LLCSell-413,077129,261$40,757
Q2 2014Eagle Capital ManagementBuy2068,737$2,755
Q1 2014Viking Global InvestorsBuy98,555388,900$118,953
Q1 2014Eagle Capital ManagementBuy3,8918,531$2,609
Q4 2013Renaissance Technologies LLCSell-327,362542,338$151,623
Q4 2013Eagle Capital ManagementBuy4,6404,640$1,297
Q3 2013Viking Global InvestorsSell-675,943290,345$69,903
Q3 2013Renaissance Technologies LLCSell-523,800869,700$209,389
Q3 2013Mairs & Power Growth FundSell-1751,125$271
Q2 2013Renaissance Technologies LLCBuy1,393,5001,393,500$299,881
Q2 2013Viking Global InvestorsBuy966,288966,288$207,945
Q2 2013Mairs & Power Growth FundBuy1,3001,300$280

Frequently asked questions about BIIB activity

  • Which institutional owners are buying BIIB?

    Institutional owners buying BIIB include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in BIIB activity?

    "Buy" means an investor increased their reported position in BIIB compared to the prior reporting period. This reflects growing exposure to BIOGEN INC (BIIB) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in BIIB increasing?

    Institutional interest in BIIB can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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