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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
Webster Bank, N. A.36$6.34K0.00%00.0%Unchanged
Rosenberg Matthew Hamilton35$6.16K0.00%00.0%Unchanged
Sunbelt Securities, Inc.33$5.81K0.00%−2−5.7%Reduced
Truvestments Capital LLC33$5.81K0.00%00.0%Unchanged
South State Corp.33$5.81K0.00%+6+22.2%Added
Fortitude Family Office, LLC32$5.63K0.00%+12+60.0%Added
GHP Investment Advisors, Inc.31$5.46K0.00%00.0%Unchanged
Howard Hughes Medical Institute31$5.46K0.00%00.0%Unchanged
Byrne Asset Management LLC30$5.28K0.00%−8−21.1%Reduced
Caldwell Sutter Capital, Inc.30$5.28K0.00%−4−11.8%Reduced
Barrett & Company, Inc.30$5.28K0.00%00.0%Unchanged
Marquette Asset Management, LLC30$5.28K0.00%00.0%Unchanged
St Germain D J Co Inc30$5.28K0.00%00.0%Unchanged
Tower View Investment Management & Research LLC29$5.10K0.00%00.0%Unchanged
American Wealth Advisors, LLC29$5.10K0.01%00.0%Unchanged
Bangor Savings Bank28$4.93K0.00%00.0%Unchanged
Align Financial, LLC4,928$4.93K0.00%+4,928New
Rakuten Securities, Inc.27$4.75K0.00%−22−44.9%Reduced
Pinnacle Bancorp, Inc.27$4.75K0.00%−5−15.6%Reduced
J.Safra Asset Management Corp27$4.75K0.00%+12+80.0%Added
Abound Wealth Management26$4.53K0.00%+4+18.2%Added
Hughes Financial Services, LLC25$4.40K0.00%00.0%Unchanged
Tucker Asset Management LLC25$4.40K0.00%+25New
Optima Capital LLC25$4.40K0.00%+25New
Ares Financial Consulting, LLC25$4.40K0.00%+25New
Consultiva Wealth Management, Corp.25$4.40K0.01%00.0%Unchanged
Roble, Belko & Company, Inc25$4.00K0.00%00.0%Unchanged
Motiv8 Investments LLC23$4.00K0.00%+23New
Garner Asset Management Corp22$3.87K0.00%+22New
Prosperity Bancshares Inc21$3.70K0.00%+21New
First United Bank Trust20$3.52K0.00%00.0%Unchanged
Colonial Trust Advisors20$3.52K0.00%00.0%Unchanged
Vision Retirement, LLC20$3.52K0.00%+20New
Nvest Wealth Strategies, Inc.19$3.34K0.00%+19New
Ameriflex Group, Inc.18$3.17K0.00%−18−50.0%Reduced
E Fund Management (Hong Kong) Co., Ltd.17$3.04K0.00%−82−82.8%Reduced
Plante Moran Financial Advisors, LLC17$2.99K0.00%00.0%Unchanged
Transamerica Financial Advisors, Inc.17$2.94K0.00%−2−10.5%Reduced
Financial Management Professionals, Inc.16$2.82K0.00%00.0%Unchanged
NVWM, LLC16$2.82K0.00%+2+14.3%Added
Darwin Advisors, LLC16$2.81K0.00%00.0%Unchanged
Fortis Group Advisors, LLC15$2.64K0.00%00.0%Unchanged
DiNuzzo Private Wealth, Inc.14$2.46K0.00%+12+600.0%Added
Rossby Financial, LCC14$2.46K0.00%+14New
Godfrey Financial Associates, Inc.14$2.46K0.00%+14New
Hollencrest Capital Management13$2.29K0.00%00.0%Unchanged
Bare Financial Services, Inc13$2.29K0.00%+3+30.0%Added
Bay Harbor Wealth Management, LLC13$2.29K0.00%+11+550.0%Added
Rialto Wealth Management, LLC12$2.11K0.00%+3+33.3%Added
WestEnd Advisors, LLC12$2.11K0.00%+8+200.0%Added
Winnow Wealth LLC12$2.11K0.00%+9+300.0%Added
SJS Investment Consulting Inc.12$2.11K0.00%+12New
Penserra Capital Management LLC12$2.00K0.00%−5,033−99.8%Reduced
Crewe Advisors LLC11$1.94K0.00%00.0%Unchanged
Park Place Capital Corp11$1.94K0.00%00.0%Unchanged
Bernard Wealth Management Corp.11$1.94K0.00%00.0%Unchanged
Indiana Trust & Investment Management CO10$1.76K0.00%00.0%Unchanged
1 North Wealth Services LLC10$1.76K0.00%00.0%Unchanged
Strategic Investment Solutions, Inc.10$1.76K0.00%00.0%Unchanged
Mowery & Schoenfeld Wealth Management, LLC10$1.76K0.00%+10New
MidFirst Bank10$1.76K0.00%+10New
1015 Capital Partners, LLC10$1.76K0.00%+10New
Thurston, Springer, Miller, Herd & Titak, Inc.10$1.76K0.00%+10New
AdvisorNet Financial, Inc9$1.58K0.00%00.0%Unchanged
Wealth Preservation Advisors, LLC9$1.58K0.00%00.0%Unchanged
IMG Wealth Management, Inc.9$1.58K0.00%00.0%Unchanged
Wealth Watch Advisors, INC9$1.58K0.00%00.0%Unchanged
American Capital Advisory, LLC8$1.42K0.00%00.0%Unchanged
Clark Wealth Partners7$1.23K0.00%00.0%Unchanged
Cape Investment Advisory, Inc.7$1.23K0.00%00.0%Unchanged
Albion Financial Group6$1.06K0.00%00.0%Unchanged
Quaker Wealth Management, LLC6$1.06K0.00%00.0%Unchanged
Valley National Advisers Inc8$1.00K0.00%+8New
Smithfield Trust Co6$1.00K0.00%+6New
Sound Income Strategies, LLC6$9870.00%+6New
Three Bearings Fiduciary Advisors, Inc.5$9000.00%+5New
Dunhill Financial, LLC5$8930.00%+2+66.7%Added
Geneos Wealth Management Inc.5$8800.00%−24−82.8%Reduced
Atwood & Palmer Inc5$8800.00%00.0%Unchanged
Evermay Wealth Management LLC5$8800.00%00.0%Unchanged
Wolff Wiese Magana LLC5$8800.00%00.0%Unchanged
HFM Investment Advisors, LLC5$8800.00%+4+400.0%Added
Financial Consulate, Inc4$7040.00%00.0%Unchanged
TFC Financial Management4$7040.00%00.0%Unchanged
Breakwater Investment Management4$7040.00%00.0%Unchanged
Chilton Capital Management LLC4$7040.00%+4New
Signature Equity Partners, LLC4$7040.00%+4New
Fairman Group, LLC3$5280.00%−3−50.0%Reduced
DecisionPoint Financial, LLC3$5280.00%00.0%Unchanged
Colonial Trust Co3$5280.00%00.0%Unchanged
Turning Point Benefit Group, Inc.3$5270.00%00.0%Unchanged
Curio Wealth, LLC2$3530.00%+2New
Quantbot Technologies LP2$3520.00%−688−99.7%Reduced
Country Trust Bank2$3520.00%00.0%Unchanged
Davis Capital Management2$3520.00%00.0%Unchanged
Seneschal Advisors, LLC2$3520.00%+2New
Creative Financial Designs Inc1$1760.00%00.0%Unchanged
ROSS\JOHNSON & Associates LLC1$1760.00%00.0%Unchanged
Nemes Rush Group LLC1$1760.00%+1New
NorthAvenue LLC1$1760.00%+1New