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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
Transcend Wealth Collective, LLC1,679$235.2K0.02%+1,679New
Sym Financial Corp1,695$237.4K0.03%+1,695New
Fidelis Capital Partners, LLC1,703$238.6K0.02%+1,703New
DGS Capital Management, LLC1,708$239.3K0.04%+1,708New
Waddell & Associates, LLC1,719$240.8K0.02%+1,719New
Investment House LLC1,730$242.3K0.01%00.0%Unchanged
Mission Wealth Management, LP1,730$242.3K0.00%−126−6.8%Reduced
Parkside Financial Bank & Trust1,739$243.6K0.02%+92+5.6%Added
Hancock Whitney Corp1,740$243.7K0.00%−21−1.2%Reduced
Marathon Trading Investment Management LLC1,750$245.1K0.10%−1,000−36.4%Reduced
QTR Family Wealth, LLC1,760$246.5K0.12%+1,760New
Simplicity Wealth,LLC1,776$248.8K0.01%−1,648−48.1%Reduced
Atria Investments LLC1,789$250.6K0.00%−151−7.8%Reduced
Advisory Services Network, LLC1,792$251.0K0.00%+68+3.9%Added
Trail Ridge Investment Advisors, LLC1,807$253.1K0.11%00.0%Unchanged
Stratos Wealth Partners, LTD.1,810$253.5K0.00%−86−4.5%Reduced
Crestwood Advisors Group LLC1,821$255.1K0.00%+1,821New
Claret Asset Management Corp1,838$257.0K0.03%−26−1.4%Reduced
Westpac Banking Corp1,838$257.5K0.02%−1,797−49.4%Reduced
Rock Point Advisors, LLC1,840$257.7K0.07%00.0%Unchanged
Patton Fund Management, Inc.1,846$258.6K0.05%+1,846New
Investors Research Corp1,850$259.1K0.05%00.0%Unchanged
Claro Advisors LLC1,857$260.1K0.04%−45−2.4%Reduced
Forbes J M & Co LLP1,869$261.8K0.02%00.0%Unchanged
Peapack Gladstone Financial Corp1,868$262.0K0.00%+22+1.2%Added
Traub Capital Management LLC1,910$267.6K0.26%00.0%Unchanged
HighPoint Advisor Group LLC1,958$274.3K0.01%+12+0.6%Added
Bridgefront Capital, LLC1,962$274.8K0.08%+1,962New
BSW Wealth Partners1,988$278.5K0.03%+1,988New
J.W. Cole Advisors, Inc.1,991$278.9K0.01%−26−1.3%Reduced
Citizens Financial Group Inc1,997$279.8K0.00%+206+11.5%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
Wedbush Securities Inc2,017$283.0K0.01%+46+2.3%Added
Cidel Asset Management Inc2,024$283.5K0.02%+162+8.7%Added
National Asset Management, Inc.2,026$283.8K0.01%+35+1.8%Added
Trust Co of Toledo NA2,039$285.6K0.03%−186−8.4%Reduced
Fred Alger Management, LLC2,039$285.6K0.00%+2,039New
Proathlete Wealth Management LLC2,068$289.7K0.08%−10.0%Reduced
Advus Financial Partners, LLC2,070$290.0K0.07%+2,070New
Assetmark, Inc2,071$290.1K0.00%+390+23.2%Added
SBI Securities Co., Ltd.2,086$292.2K0.01%+139+7.1%Added
Campbell & CO Investment Adviser LLC2,094$293.3K0.02%−4,666−69.0%Reduced
Camelot Portfolios, LLC2,100$294.2K0.17%+2,100New
Petros Family Wealth, LLC2,109$295.4K0.25%+2,109New
Flputnam Investment Management Co2,121$297.1K0.00%+231+12.2%Added
Kestra Advisory Services, LLC2,122$297.2K0.00%−105−4.7%Reduced
111 Capital2,130$298.4K0.06%−2,137−50.1%Reduced
Evercore Wealth Management, LLC2,142$300.1K0.00%00.0%Unchanged
Capital Investment Advisors, LLC2,145$300.5K0.00%−19−0.9%Reduced
Philip James Wealth Mangement, LLC2,146$300.6K0.04%+2,146New
Callan Family Office, LLC2,152$301.5K0.01%−302−12.3%Reduced
Navellier & Associates Inc2,164$303.1K0.03%00.0%Unchanged
Independent Advisor Alliance2,171$304.1K0.01%+2,171New
Lineweaver Wealth Advisors, LLC2,209$309.4K0.05%+2,209New
Atom Investors LP2,222$311.3K0.02%+2,222New
EverSource Wealth Advisors, LLC2,247$314.8K0.01%+243+12.1%Added
Richwood Investment Advisors, LLC2,247$314.8K0.25%−10.0%Reduced
Philadelphia Trust Co2,250$315.0K0.02%00.0%Unchanged
Voleon Capital Management LP2,253$315.6K0.01%+2,253New
Great Valley Advisor Group, Inc.2,272$317.9K0.01%+196+9.4%Added
Huntington National Bank2,285$320.1K0.00%+235+11.5%Added
Sivia Capital Partners, LLC2,298$321.9K0.09%+581+33.8%Added
Harbor Capital Advisors, Inc.2,298$322.0K0.03%+57+2.5%Added
Flagship Harbor Advisors, LLC2,299$322.0K0.01%−39−1.7%Reduced
Fayez Sarofim & Co2,300$322.2K0.00%00.0%Unchanged
Supplemental Annuity Collective Trust of NJ2,300$322.2K0.08%+2,300New
Evergreen Capital Management LLC2,317$324.6K0.01%+385+19.9%Added
Storebrand Asset Management AS2,335$327.1K0.00%+1,272+119.7%Added
PDT Partners, LLC2,348$328.9K0.02%−29,316−92.6%Reduced
Sectoral Asset Management Inc2,375$332.7K0.21%00.0%Unchanged
Motley Fool Asset Management LLC2,388$334.5K0.01%−5,109−68.1%Reduced
Sage Mountain Advisors LLC2,390$334.8K0.02%+2,390New
Oracle Investment Management Inc2,412$337.9K0.24%00.0%Unchanged
Entropy Technologies, LP2,413$338.0K0.03%−5,427−69.2%Reduced
Ocean Capital Management, LLC2,415$338.3K0.07%−125−4.9%Reduced
Allegheny Financial Group LTD2,419$338.9K0.06%00.0%Unchanged
Personal Cfo Solutions, LLC2,438$341.5K0.06%+421+20.9%Added
RSM US Wealth Management LLC2,444$342.4K0.00%+773+46.3%Added
Exchange Traded Concepts, LLC2,451$343.3K0.00%−67−2.7%Reduced
Kathmere Capital Management, LLC2,473$346.4K0.02%+810+48.7%Added
Caerus Investment Advisors, LLC2,480$347.4K0.14%+2,480New
DKRT Investments Corp.2,500$350.2K0.08%00.0%Unchanged
Prudential PLC2,508$351.3K0.00%00.0%Unchanged
Marex Group plc2,525$353.7K0.00%+2,525New
AlphaCore Capital LLC2,529$354.3K0.01%+1,883+291.5%Added
TFB Advisors LLC2,448$355.7K0.10%−23−0.9%Reduced
Westside Investment Management, Inc.2,480$358.9K0.06%−100−3.9%Reduced
Requisite Capital Management, LLC2,585$362.1K0.06%+2,585New
Advanced Portfolio Management, LLC2,641$365.8K0.95%00.0%Unchanged
Integrated Advisors Network LLC2,613$366.0K0.02%+315+13.7%Added
Avestar Capital, LLC2,622$367.3K0.03%−175−6.3%Reduced
Tema ETFs LLC2,624$367.6K0.03%+113+4.5%Added
Eagle Global Advisors LLC2,625$367.7K0.01%00.0%Unchanged
Polymer Capital Management (US) LLC2,674$374.6K0.05%−1,086−28.9%Reduced
Klingenstein Fields & Co LP2,731$382.6K0.01%00.0%Unchanged
Uncommon Cents Investing LLC2,749$385.1K0.10%+10+0.4%Added