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
Q1 2020H&H International InvestmentBuy10,00010,000$3,164
Q1 2020Berkshire HathawaySell-5,425643,022$203,440
Q1 2020Hancock Classic ValueSell-2,51947,151$14,918
Q1 2020Hillman Value FundSell-1,73416,380$5,182
Q4 2019Berkshire HathawayBuy648,447648,447$192,414
Q4 2019Renaissance Technologies LLCBuy348,7004,569,906$1,356,028
Q4 2019Hancock Classic ValueBuy46,47749,670$14,739
Q4 2019Hillman Value FundBuy18,11418,114$5,375
Q4 2019Muhlenkamp & CoSell-617,768$5,272
Q3 2019Renaissance Technologies LLCBuy1,738,1294,221,206$982,781
Q3 2019Parnassus Endeavor FundSell-350,584574,416$133,736
Q3 2019Hancock Classic ValueBuy8753,193$743
Q3 2019Muhlenkamp & CoSell-617,774$4,138
Q2 2019Renaissance Technologies LLCBuy851,2632,483,077$580,717
Q2 2019Parnassus Endeavor FundBuy295,000925,000$216,330
Q2 2019Hancock Classic ValueSell-1332,318$542
Q2 2019Muhlenkamp & CoSell-6317,780$4,158
Q1 2019Renaissance Technologies LLCBuy617,1001,631,814$385,728
Q1 2019Parnassus Endeavor FundBuy280,000630,000$148,919
Q1 2019Muhlenkamp & CoSell-52517,843$4,218
Q1 2019Hancock Classic ValueBuy3452,451$579
Q4 2018Parnassus Endeavor FundBuy295,000350,000$105,322
Q4 2018Renaissance Technologies LLCBuy168,6391,014,714$305,348
Q4 2018Scion Asset ManagementBuy10,00010,000$3,009
Q4 2018Hancock Classic ValueBuy2422,106$634
Q3 2018Renaissance Technologies LLCBuy218,414846,075$298,927
Q3 2018ARK InvestBuy8,44822,498$7,949
Q3 2018Muhlenkamp & CoSell-6,80318,368$6,490
Q3 2018Hancock Classic ValueBuy741,864$659
Q2 2018Parnassus Endeavor FundBuy55,00055,000$15,963

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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