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 2016ARK InvestBuy3,3433,343$948
Q4 2016Muhlenkamp & CoSell-19923,279$6,601
Q3 2016Viking Global InvestorsSell-1,024,1712,186,336$684,389
Q3 2016Renaissance Technologies LLCBuy197,861238,261$74,583
Q3 2016First Eagle U.S. ValueBuy124,500457,260$143,136
Q3 2016Causeway Capital ManagementSell-84,819404,444$142,206
Q3 2016Hancock Classic ValueBuy642642$201
Q3 2016Muhlenkamp & CoSell-22523,478$7,349
Q2 2016Viking Global InvestorsBuy2,979,5603,210,507$776,365
Q2 2016Causeway Capital ManagementBuy489,263489,263$135,200
Q2 2016First Eagle U.S. ValueBuy108,175332,760$80,468
Q2 2016Renaissance Technologies LLCSell-87,26140,400$9,770
Q2 2016Muhlenkamp & CoSell-15023,703$5,732
Q1 2016Viking Global InvestorsSell-137,917230,947$60,120
Q1 2016Renaissance Technologies LLCBuy92,700127,661$33,233
Q1 2016First Eagle U.S. ValueBuy30,700224,585$58,464
Q1 2016Muhlenkamp & CoBuy23,85323,853$6,209
Q1 2016Mairs & Power Growth FundSell-701,025$267
Q4 2015First Eagle U.S. ValueBuy193,885193,885$59,397
Q4 2015Viking Global InvestorsSell-144,580368,864$113,001
Q4 2015Vulcan Value PartnersBuy750750$230
Q3 2015Renaissance Technologies LLCSell-70,30034,961$10,202
Q2 2015Viking Global InvestorsBuy124,544513,444$207,401
Q2 2015Renaissance Technologies LLCBuy74,961105,261$42,519
Q2 2015Mairs & Power Growth FundSell-251,095$442
Q2 2015Eagle Capital ManagementSell-228,542$3,450
Q1 2015Renaissance Technologies LLCSell-34,86130,300$12,794
Q1 2015Eagle Capital ManagementSell-428,564$3,616
Q1 2015Mairs & Power Growth FundSell-201,120$473
Q4 2014Renaissance Technologies LLCSell-27,50065,161$22,119

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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