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Biogen Inc.

BIIB
Exchange
Nasdaq
Industry
Biological Products, (No Diagnostic Substances)
SEC CIK
0000875045

In the last 90 days, Biogen Inc. insiders filed 0 open-market purchases and 1 sale; 1,047 institutions reported holding it in 13F filings for Q2 2026, worth $30.7B in total; no superinvestor holds it.

13F holders, Q3 2025

Institutional positions in Biogen Inc. as of Sep 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders
909
+52 vs. Q2 2025
Shares held
131.3M
+3.52M (+2.8%) vs. Q2 2025
Total value
$18.4B
+$2.32B (+14.5%) vs. Q2 2025
New holders
125
323 more added
Sold out
73
268 more reduced

10 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2025: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting BIIB on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ3 2025: 909 institutions
Q1 2021: 1,096 institutionsQ2 2021: 1,107 institutionsQ3 2021: 1,044 institutionsQ4 2021: 1,014 institutionsQ1 2022: 954 institutionsQ2 2022: 930 institutionsQ3 2022: 987 institutionsQ4 2022: 1,033 institutionsQ1 2023: 1,004 institutionsQ2 2023: 1,009 institutionsQ3 2023: 966 institutionsQ4 2023: 1,005 institutionsQ1 2024: 955 institutionsQ2 2024: 947 institutionsQ3 2024: 921 institutionsQ4 2024: 879 institutionsQ1 2025: 882 institutionsQ2 2025: 867 institutionsQ3 2025: 909 institutionsQ4 2025: 1,002 institutionsQ1 2026: 1,015 institutionsQ2 2026: 1,047 institutions
Value heldQ3 2025: $18.4B
Q1 2021: $35.7BQ2 2021: $43.6BQ3 2021: $35.1BQ4 2021: $29.7BQ1 2022: $25.9BQ2 2022: $25.0BQ3 2022: $33.0BQ4 2022: $34.6BQ1 2023: $35.0BQ2 2023: $36.1BQ3 2023: $32.2BQ4 2023: $33.3BQ1 2024: $28.0BQ2 2024: $29.9BQ3 2024: $25.1BQ4 2024: $20.2BQ1 2025: $17.7BQ2 2025: $16.3BQ3 2025: $18.4BQ4 2025: $24.6BQ1 2026: $24.7BQ2 2026: $30.7B
Institutions holding BIIB and their total value by quarter
QuarterHoldersValue
Q2 20261,047$30.7B
Q1 20261,015$24.7B
Q4 20251,002$24.6B
Q3 2025909$18.4B
Q2 2025867$16.3B
Q1 2025882$17.7B
Q4 2024879$20.2B
Q3 2024921$25.1B
Q2 2024947$29.9B
Q1 2024955$28.0B
Q4 20231,005$33.3B
Q3 2023966$32.2B
Q2 20231,009$36.1B
Q1 20231,004$35.0B
Q4 20221,033$34.6B
Q3 2022987$33.0B
Q2 2022930$25.0B
Q1 2022954$25.9B
Q4 20211,014$29.7B
Q3 20211,044$35.1B
Q2 20211,107$43.6B
Q1 20211,096$35.7B

Institutions, Q3 2025

Shares, value and share of portfolio for each institution holding Biogen Inc.; share changes are against Q2 2025.

Institutions holding BIIB in Q3 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Allworth Financial LP2,840$397.8K0.00%+661+30.3%Added
MUFG Securities EMEA plc2,806$393.1K0.01%+2,375+551.0%Added
KCM Investment Advisors LLC2,799$392.1K0.01%−20−0.7%Reduced
Vise Technologies, Inc.2,799$392.0K0.01%−371−11.7%Reduced
Nicolet Bankshares Inc2,792$391.1K0.06%+2+0.1%Added
Bessemer Group Inc2,772$389.0K0.00%−772−21.8%Reduced
Syon Capital LLC2,770$388.0K0.02%+518+23.0%Added
Kennondale Capital Management LLC2,760$386.6K0.30%00.0%Unchanged
Uncommon Cents Investing LLC2,749$385.1K0.10%+10+0.4%Added
Klingenstein Fields & Co LP2,731$382.6K0.01%00.0%Unchanged
Polymer Capital Management (US) LLC2,674$374.6K0.05%−1,086−28.9%Reduced
Eagle Global Advisors LLC2,625$367.7K0.01%00.0%Unchanged
Tema ETFs LLC2,624$367.6K0.03%+113+4.5%Added
Avestar Capital, LLC2,622$367.3K0.03%−175−6.3%Reduced
Integrated Advisors Network LLC2,613$366.0K0.02%+315+13.7%Added
Advanced Portfolio Management, LLC2,641$365.8K0.95%00.0%Unchanged
Requisite Capital Management, LLC2,585$362.1K0.06%+2,585New
Westside Investment Management, Inc.2,480$358.9K0.06%−100−3.9%Reduced
TFB Advisors LLC2,448$355.7K0.10%−23−0.9%Reduced
AlphaCore Capital LLC2,529$354.3K0.01%+1,883+291.5%Added
Marex Group plc2,525$353.7K0.00%+2,525New
Prudential PLC2,508$351.3K0.00%00.0%Unchanged
DKRT Investments Corp.2,500$350.2K0.08%00.0%Unchanged
Caerus Investment Advisors, LLC2,480$347.4K0.14%+2,480New
Kathmere Capital Management, LLC2,473$346.4K0.02%+810+48.7%Added
Exchange Traded Concepts, LLC2,451$343.3K0.00%−67−2.7%Reduced
RSM US Wealth Management LLC2,444$342.4K0.00%+773+46.3%Added
Personal Cfo Solutions, LLC2,438$341.5K0.06%+421+20.9%Added
Allegheny Financial Group LTD2,419$338.9K0.06%00.0%Unchanged
Ocean Capital Management, LLC2,415$338.3K0.07%−125−4.9%Reduced
Entropy Technologies, LP2,413$338.0K0.03%−5,427−69.2%Reduced
Oracle Investment Management Inc2,412$337.9K0.24%00.0%Unchanged
Sage Mountain Advisors LLC2,390$334.8K0.02%+2,390New
Motley Fool Asset Management LLC2,388$334.5K0.01%−5,109−68.1%Reduced
Sectoral Asset Management Inc2,375$332.7K0.21%00.0%Unchanged
PDT Partners, LLC2,348$328.9K0.02%−29,316−92.6%Reduced
Storebrand Asset Management AS2,335$327.1K0.00%+1,272+119.7%Added
Evergreen Capital Management LLC2,317$324.6K0.01%+385+19.9%Added
Fayez Sarofim & Co2,300$322.2K0.00%00.0%Unchanged
Supplemental Annuity Collective Trust of NJ2,300$322.2K0.08%+2,300New
Flagship Harbor Advisors, LLC2,299$322.0K0.01%−39−1.7%Reduced
Harbor Capital Advisors, Inc.2,298$322.0K0.03%+57+2.5%Added
Sivia Capital Partners, LLC2,298$321.9K0.09%+581+33.8%Added
Huntington National Bank2,285$320.1K0.00%+235+11.5%Added
Great Valley Advisor Group, Inc.2,272$317.9K0.01%+196+9.4%Added
Voleon Capital Management LP2,253$315.6K0.01%+2,253New
Philadelphia Trust Co2,250$315.0K0.02%00.0%Unchanged
Richwood Investment Advisors, LLC2,247$314.8K0.25%−10.0%Reduced
EverSource Wealth Advisors, LLC2,247$314.8K0.01%+243+12.1%Added
Atom Investors LP2,222$311.3K0.02%+2,222New
Lineweaver Wealth Advisors, LLC2,209$309.4K0.05%+2,209New
Independent Advisor Alliance2,171$304.1K0.01%+2,171New
Navellier & Associates Inc2,164$303.1K0.03%00.0%Unchanged
Callan Family Office, LLC2,152$301.5K0.01%−302−12.3%Reduced
Philip James Wealth Mangement, LLC2,146$300.6K0.04%+2,146New
Capital Investment Advisors, LLC2,145$300.5K0.00%−19−0.9%Reduced
Evercore Wealth Management, LLC2,142$300.1K0.00%00.0%Unchanged
111 Capital2,130$298.4K0.06%−2,137−50.1%Reduced
Kestra Advisory Services, LLC2,122$297.2K0.00%−105−4.7%Reduced
Flputnam Investment Management Co2,121$297.1K0.00%+231+12.2%Added
Petros Family Wealth, LLC2,109$295.4K0.25%+2,109New
Camelot Portfolios, LLC2,100$294.2K0.17%+2,100New
Campbell & CO Investment Adviser LLC2,094$293.3K0.02%−4,666−69.0%Reduced
SBI Securities Co., Ltd.2,086$292.2K0.01%+139+7.1%Added
Assetmark, Inc2,071$290.1K0.00%+390+23.2%Added
Advus Financial Partners, LLC2,070$290.0K0.07%+2,070New
Proathlete Wealth Management LLC2,068$289.7K0.08%−10.0%Reduced
Trust Co of Toledo NA2,039$285.6K0.03%−186−8.4%Reduced
Fred Alger Management, LLC2,039$285.6K0.00%+2,039New
National Asset Management, Inc.2,026$283.8K0.01%+35+1.8%Added
Cidel Asset Management Inc2,024$283.5K0.02%+162+8.7%Added
Wedbush Securities Inc2,017$283.0K0.01%+46+2.3%Added
Estabrook Capital Management2,000$280.2K0.04%00.0%Unchanged
Heritage Wealth Advisors2,000$280.2K0.01%00.0%Unchanged
Northwest & Ethical Investments L.P.2,000$280.2K0.01%00.0%Unchanged
Knott David M Jr2,000$280.2K0.12%+2,000New
Catalytic Wealth RIA, LLC2,000$280.2K0.01%+2,000New
Citizens Financial Group Inc1,997$279.8K0.00%+206+11.5%Added
J.W. Cole Advisors, Inc.1,991$278.9K0.01%−26−1.3%Reduced
BSW Wealth Partners1,988$278.5K0.03%+1,988New
Bridgefront Capital, LLC1,962$274.8K0.08%+1,962New
HighPoint Advisor Group LLC1,958$274.3K0.01%+12+0.6%Added
Traub Capital Management LLC1,910$267.6K0.26%00.0%Unchanged
Peapack Gladstone Financial Corp1,868$262.0K0.00%+22+1.2%Added
Forbes J M & Co LLP1,869$261.8K0.02%00.0%Unchanged
Claro Advisors LLC1,857$260.1K0.04%−45−2.4%Reduced
Investors Research Corp1,850$259.1K0.05%00.0%Unchanged
Patton Fund Management, Inc.1,846$258.6K0.05%+1,846New
Rock Point Advisors, LLC1,840$257.7K0.07%00.0%Unchanged
Westpac Banking Corp1,838$257.5K0.02%−1,797−49.4%Reduced
Claret Asset Management Corp1,838$257.0K0.03%−26−1.4%Reduced
Crestwood Advisors Group LLC1,821$255.1K0.00%+1,821New
Stratos Wealth Partners, LTD.1,810$253.5K0.00%−86−4.5%Reduced
Trail Ridge Investment Advisors, LLC1,807$253.1K0.11%00.0%Unchanged
Advisory Services Network, LLC1,792$251.0K0.00%+68+3.9%Added
Atria Investments LLC1,789$250.6K0.00%−151−7.8%Reduced
Simplicity Wealth,LLC1,776$248.8K0.01%−1,648−48.1%Reduced
QTR Family Wealth, LLC1,760$246.5K0.12%+1,760New
Marathon Trading Investment Management LLC1,750$245.1K0.10%−1,000−36.4%Reduced
Hancock Whitney Corp1,740$243.7K0.00%−21−1.2%Reduced