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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, Q4 2025

Institutional positions in Biogen Inc. as of Dec 31, 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
1,002
+109 vs. Q3 2025
Shares held
139.7M
+8.71M (+6.6%) vs. Q3 2025
Total value
$24.6B
+$6.26B (+34.1%) vs. Q3 2025
New holders
191
323 more added
Sold out
82
295 more reduced

16 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q3 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 holdersQ4 2025: 1,002 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 heldQ4 2025: $24.6B
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, Q4 2025

Shares, value and share of portfolio for each institution holding Biogen Inc.; share changes are against Q3 2025.

Institutions holding BIIB in Q4 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Nicolet Bankshares Inc2,169$381.7K0.06%−623−22.3%Reduced
Westpac Banking Corp2,178$383.3K0.02%+340+18.5%Added
DGS Capital Management, LLC2,182$384.0K0.07%+474+27.8%Added
Crestwood Advisors Group LLC2,194$386.0K0.01%+373+20.5%Added
Empirical Financial Services, LLC d.b.a. Empirical Wealth Management2,218$390.3K0.01%+753+51.4%Added
TCW Group Inc2,226$391.8K0.00%+2,226New
Parallax Volatility Advisers, L.P.2,237$393.7K0.01%+2,237New
Prospera Financial Services Inc2,240$394.2K0.01%+2,240New
Clearstead Advisors, LLC2,249$395.8K0.00%+747+49.7%Added
We Are One Seven, LLC2,251$396.2K0.01%+2,251New
Beese Fulmer Investment Management, Inc.2,272$399.9K0.03%+2,272New
Colonial River Wealth Management, LLC2,273$400.0K0.14%+2,273New
AIA Group Ltd2,275$400.4K0.01%−19,886−89.7%Reduced
Axxcess Wealth Management, LLC2,281$401.4K0.01%+2,281New
Harbor Capital Advisors, Inc.2,294$404.0K0.03%−4−0.2%Reduced
Fayez Sarofim & Co2,300$404.8K0.00%00.0%Unchanged
Supplemental Annuity Collective Trust of NJ2,300$404.8K0.10%00.0%Unchanged
Sivia Capital Partners, LLC2,315$407.4K0.08%+17+0.7%Added
Philip James Wealth Mangement, LLC2,328$409.7K0.05%+182+8.5%Added
PDT Partners, LLC2,348$413.2K0.03%00.0%Unchanged
RSM US Wealth Management LLC2,377$419.3K0.01%−67−2.7%Reduced
Assetmark, Inc2,392$421.0K0.00%+321+15.5%Added
EverSource Wealth Advisors, LLC2,398$422.1K0.02%+151+6.7%Added
Personal Cfo Solutions, LLC2,403$422.9K0.07%−35−1.4%Reduced
McAdam, LLC2,410$424.1K0.02%+2,410New
Oracle Investment Management Inc2,412$424.5K0.28%00.0%Unchanged
Ocean Capital Management, LLC2,415$425.0K0.08%00.0%Unchanged
Richwood Investment Advisors, LLC2,122$427.0K0.31%−125−5.6%Reduced
Capstone Investment Advisors, LLC2,445$430.3K0.00%−5,826−70.4%Reduced
Huntington National Bank2,447$430.7K0.00%+162+7.1%Added
TFB Advisors LLC2,448$430.8K0.12%00.0%Unchanged
Landscape Capital Management, L.L.C.2,459$432.8K0.03%−4,663−65.5%Reduced
XTX Topco Ltd2,459$432.8K0.01%+2,459New
Emerald Mutual Fund Advisers Trust2,465$433.8K0.02%+1,842+295.7%Added
F/M Investments LLC2,465$433.8K0.02%+2,465New
NewEdge Wealth, LLC2,470$434.7K0.00%+2,470New
IHT Wealth Management, LLC2,473$435.3K0.01%+2,473New
Ostrum Asset Management2,476$435.8K0.02%−8,982−78.4%Reduced
DKRT Investments Corp.2,500$440.0K0.12%00.0%Unchanged
Andra AP-fonden2,500$440.0K0.01%+2,500New
Trust Co of Toledo NA2,507$441.2K0.04%+468+23.0%Added
Prudential PLC2,508$441.4K0.00%00.0%Unchanged
Xxi Wealth, LLC2,515$442.6K0.27%+2,515New
Westside Investment Management, Inc.2,512$443.6K0.07%+32+1.3%Added
Motley Fool Asset Management LLC2,541$447.2K0.02%+153+6.4%Added
AlphaCore Capital LLC2,554$449.5K0.01%+25+1.0%Added
Pitcairn Wealth Advisors LLC2,565$451.4K0.04%+2,565New
Evergreen Capital Management LLC2,588$455.5K0.01%+271+11.7%Added
Eagle Global Advisors LLC2,600$457.6K0.02%−25−1.0%Reduced
Quadrature Capital Ltd2,611$459.5K0.00%+2,611New
Tema ETFs LLC2,620$461.1K0.04%−4−0.2%Reduced
EFG International AG2,635$463.7K0.01%+2,635New
Caerus Investment Advisors, LLC2,667$469.4K0.16%+187+7.5%Added
Waterfront Wealth Inc.2,769$474.4K0.09%+38+1.4%Added
Bessemer Group Inc2,711$478.0K0.00%−61−2.2%Reduced
Integrated Wealth Concepts LLC2,726$479.8K0.01%−1,661−37.9%Reduced
Klingenstein Fields & Co LP2,731$480.6K0.02%00.0%Unchanged
Chicago Partners Investment Group LLC2,816$483.2K0.01%+92+3.4%Added
Kennondale Capital Management LLC2,760$485.7K0.36%00.0%Unchanged
Uncommon Cents Investing LLC2,779$489.1K0.12%+30+1.1%Added
Warren Averett Asset Management, LLC2,793$491.5K0.00%+2,793New
KCM Investment Advisors LLC2,799$492.6K0.02%00.0%Unchanged
Quest Partners LLC2,799$492.6K0.03%+2,424+646.4%Added
Twinbeech Capital LP2,834$498.8K0.04%+2,834New
Atlas Capital Advisors LLC2,844$500.5K0.06%+2,844New
Cim Investment Mangement Inc2,844$500.5K0.13%00.0%Unchanged
Arrowpoint Investment Partners (Singapore) Pte. Ltd.2,855$502.5K0.07%+2,855New
Tower Trust & Investment Co2,857$502.7K0.32%−43−1.5%Reduced
Persistent Asset Partners Ltd2,874$505.8K0.24%+2,874New
Hunter Associates Investment Management LLC2,886$509.0K0.07%00.0%Unchanged
Aquatic Capital Management LLC2,909$512.0K0.01%+2,909New
Wedmont Private Capital2,793$522.0K0.02%+113+4.2%Added
Pictet & Cie (Europe) SA2,969$522.5K0.01%+103+3.6%Added
Horizon Kinetics Asset Management LLC2,988$525.9K0.01%−131−4.2%Reduced
Massachusetts Wealth Management2,999$527.8K0.25%+125+4.3%Added
Oppenheimer Asset Management Inc.3,012$530.1K0.01%+3,012New
Park Avenue Securities LLC3,030$533.0K0.00%−417−12.1%Reduced
Roberts Glore & Co Inc3,081$542.2K0.14%−848−21.6%Reduced
Phoenix Holdings Ltd.3,133$551.1K0.01%+3,133New
Syon Capital LLC3,146$553.7K0.03%+376+13.6%Added
Alps Advisors Inc3,178$559.3K0.00%+35+1.1%Added
Evolve Private Wealth, LLC3,183$560.2K0.03%+3,183New
Tiaa Trust, National Association3,186$560.7K0.00%−516−13.9%Reduced
IKE Capital, LLC3,194$562.1K0.49%+3,194New
RDA Financial Network3,200$563.2K0.14%00.0%Unchanged
Panagora Asset Management Inc3,203$563.7K0.00%−28−0.9%Reduced
Atria Investments LLC3,203$563.7K0.01%+1,414+79.0%Added
South Dakota Investment Council3,213$565.0K0.01%−200−5.9%Reduced
Prime Capital Investment Advisors, LLC3,226$567.7K0.01%−525−14.0%Reduced
Vestcor Inc3,246$571.0K0.02%00.0%Unchanged
CoreCap Advisors, LLC3,276$576.5K0.02%+3,077+1,546.2%Added
Atomi Financial Group, Inc.3,278$576.8K0.02%+3,278New
Sax Wealth Advisors, LLC3,330$586.0K0.03%+27+0.8%Added
Beacon Pointe Advisors, LLC3,401$598.5K0.00%+177+5.5%Added
MAI Capital Management3,447$606.7K0.00%+2,757+399.6%Added
Everence Capital Management Inc3,450$607.0K0.04%00.0%Unchanged
Banque Cantonale Vaudoise3,462$609.0K0.02%−11,683−77.1%Reduced
Allworth Financial LP3,486$613.4K0.00%+646+22.7%Added
STRS Ohio3,499$615.8K0.00%+6+0.2%Added
Pavaki Capital Management LLC3,500$616.0K0.43%+3,500New