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 2026Causeway Capital ManagementSell-240,318280,783$51,475,885
Q1 2026Renaissance Technologies LLCSell-195,800203,396$37,288,589
Q1 2026Hillman Value FundSell-97629,540$5,415,568
Q1 2026Sequoia Financial AdvisorsSell-6119,953$1,824,693
Q4 2025Renaissance Technologies LLCSell-565,210399,196$70,254,504
Q4 2025Causeway Capital ManagementSell-46,417521,101$91,708,545
Q4 2025Hillman Value FundSell-7,83830,516$5,370,511
Q4 2025Sequoia Financial AdvisorsBuy1,46810,564$1,859,120
Q3 2025Renaissance Technologies LLCSell-80,700964,406$135,093,992
Q3 2025Causeway Capital ManagementBuy74,163567,518$79,497,885
Q3 2025Sequoia Financial AdvisorsBuy4,5699,096$1,274,137
Q3 2025Hillman Value FundSell-3,61838,354$5,372,628
Q2 2025Renaissance Technologies LLCBuy240,6001,045,106$131,254,863
Q2 2025Causeway Capital ManagementBuy59,838493,355$61,960,403
Q2 2025Hillman Value FundSell-2,05341,972$5,271,263
Q2 2025Sequoia Financial AdvisorsBuy1,5104,527$568,499
Q1 2025Renaissance Technologies LLCSell-387,700804,506$110,088,601
Q1 2025Causeway Capital ManagementBuy151,815433,517$59,322,464
Q1 2025Hillman Value FundBuy95944,025$6,024,381
Q1 2025Sequoia Financial AdvisorsSell-93,017$412,848
Q4 2024Renaissance Technologies LLCBuy239,5001,192,206$182,312,142
Q4 2024Causeway Capital ManagementSell-122,742281,702$43,077,910
Q4 2024Hillman Value FundBuy7,81343,066$6,585,653
Q4 2024Sequoia Financial AdvisorsBuy7293,026$462,715
Q3 2024Renaissance Technologies LLCBuy334,600952,706$184,672,531
Q3 2024Parnassus Endeavor FundBuy770361,512$70,075,486
Q3 2024Hillman Value FundSell-70135,253$6,833,442
Q3 2024Sequoia Financial AdvisorsSell-2852,297$445,224
Q2 2024Renaissance Technologies LLCSell-266,598618,106$143,289,333
Q2 2024Sequoia Financial AdvisorsBuy2412,582$598,527

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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