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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; 1,046 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: 1,046 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 20261,046$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
Rosenberg Matthew Hamilton35$6.16K0.00%00.0%Unchanged
Webster Bank, N. A.36$6.34K0.00%00.0%Unchanged
Cornerstone Financial Management LLC39$6.86K0.01%+39New
Bank Julius Baer & Co. Ltd, Zurich40$7.04K0.00%00.0%Unchanged
Anchor Investment Management, LLC40$7.04K0.00%00.0%Unchanged
Cornerstone Planning Group LLC41$7.17K0.00%+39+1,950.0%Added
DT Investment Partners, LLC42$7.39K0.00%+42New
McIlrath & Eck, LLC43$7.51K0.00%00.0%Unchanged
Bartlett & Co. Wealth Management LLC43$7.57K0.00%00.0%Unchanged
Cullen/Frost Bankers, Inc.43$7.57K0.00%+3+7.5%Added
Kilter Group LLC49$8.62K0.00%+14+40.0%Added
Tradewinds Capital Management, LLC50$8.80K0.00%00.0%Unchanged
Financial Freedom, LLC50$8.80K0.00%00.0%Unchanged
Millstone Evans Group, LLC50$8.80K0.01%00.0%Unchanged
Atlantic Trust, LLC50$8.80K0.00%+9+22.0%Added
CBIZ Investment Advisory Services, LLC51$8.97K0.00%00.0%Unchanged
Raffa Wealth Management, LLC51$8.97K0.00%+16+45.7%Added
LRI Investments, LLC52$9.13K0.00%+46+766.7%Added
Quattro Advisors LLC52$9.15K0.01%+52New
Private Wealth Management Group, LLC52$9.15K0.00%−2−3.7%Reduced
UMA Financial Services, Inc.53$9.33K0.00%00.0%Unchanged
Global X Japan Co., Ltd.55$9.68K0.00%+55New
Salomon & Ludwin, LLC57$9.95K0.00%00.0%Unchanged
Asset Dedication, LLC57$10.0K0.00%00.0%Unchanged
ORG Partners LLC58$10.2K0.00%+15+34.9%Added
Westfuller Advisors, LLC59$10.4K0.00%+33+126.9%Added
Harbor Investment Advisory, LLC62$10.9K0.00%00.0%Unchanged
Private Wealth Asset Management, LLC63$11.1K0.00%00.0%Unchanged
JFS Wealth Advisors, LLC63$11.1K0.00%+58+1,160.0%Added
First Community Trust NA65$11.4K0.01%00.0%Unchanged
Avion Wealth72$12.0K0.00%−1−1.4%Reduced
Smallwood Wealth Investment Management, LLC70$12.3K0.01%00.0%Unchanged
Sachetta, LLC70$12.3K0.01%00.0%Unchanged
Medallion Wealth Advisors, LLC73$12.8K0.00%00.0%Unchanged
Cetera Trust Company, N.A75$13.2K0.01%00.0%Unchanged
Adkins Seale Capital Management LLC75$13.2K0.01%+75New
Steigerwald, Gordon & Koch Inc.79$13.9K0.00%00.0%Unchanged
Red Tortoise LLC80$14.1K0.01%−9−10.1%Reduced
Adirondack Trust Co80$14.1K0.00%00.0%Unchanged
Hara Capital LLC84$14.8K0.01%00.0%Unchanged
Asset Planning,Inc84$14.8K0.01%00.0%Unchanged
RMG Wealth Management LLC85$14.8K0.00%+5+6.3%Added
NBC Securities, Inc.85$15.0K0.00%−18−17.5%Reduced
Brown Shipley& Co Ltd85$15.0K0.01%00.0%Unchanged
Grove Bank & Trust85$15.0K0.00%+34+66.7%Added
Centerpoint Advisors, LLC83$15.0K0.00%00.0%Unchanged
Catalyst Capital Advisors LLC88$15.5K0.00%+19+27.5%Added
Quent Capital, LLC89$15.7K0.00%+7+8.5%Added
Ransom Advisory, Ltd90$15.8K0.01%00.0%Unchanged
Swiss Re Ltd90$15.8K0.00%+90New
VSM Wealth Advisory, LLC92$16.2K0.00%00.0%Unchanged
High Note Wealth, LLC96$16.9K0.00%−3−3.0%Reduced
Clayton Financial Group LLC97$17.1K0.01%+10+11.5%Added
Delta Asset Management LLC100$17.6K0.00%00.0%Unchanged
Strengthening Families & Communities, LLC100$17.6K0.01%00.0%Unchanged
Broadwater Capital Management LLC100$17.6K0.01%00.0%Unchanged
Independence Bank of Kentucky100$17.6K0.00%+25+33.3%Added
CKW Financial Group100$18.0K0.00%00.0%Unchanged
Merrithew & Thorsten Inc106$18.0K0.02%+106New
Basecamp Wealth Advisors LLC103$18.1K0.00%+103New
Strategic Wealth Partners, Ltd.105$18.5K0.00%00.0%Unchanged
Kerr Financial Planning Corp100$18.5K0.03%+100New
Graney & King, LLC106$18.7K0.01%00.0%Unchanged
Fideuram Asset Management (Ireland) dac126$18.8K0.00%+126New
Torren Management, LLC107$18.8K0.01%+107New
Bruce G. Allen Investments, LLC110$19.4K0.01%00.0%Unchanged
GPS Wealth Strategies Group, LLC110$19.4K0.02%−535−82.9%Reduced
Intesa Sanpaolo S.p.A.110$19.4K0.00%+110New
Concord Wealth Partners114$20.1K0.00%00.0%Unchanged
Atlantic Union Bankshares Corp115$20.2K0.00%00.0%Unchanged
Johnson Financial Group, Inc.115$20.2K0.00%−4−3.4%Reduced
Bell Investment Advisors, Inc124$21.8K0.00%−48−27.9%Reduced
Ancora Advisors, LLC124$21.8K0.00%+122+6,100.0%Added
Sittner & Nelson, LLC110$22.1K0.01%00.0%Unchanged
NBT Bank N A126$22.2K0.00%−108−46.2%Reduced
Stephenson National Bank & Trust137$24.1K0.01%+58+73.4%Added
Reflection Asset Management141$24.8K0.02%+141New
WPG Advisers, LLC145$25.5K0.02%+117+417.9%Added
Ogorek Anthony Joseph152$26.0K0.01%−20−11.6%Reduced
Addison Advisors LLC151$26.6K0.01%−16−9.6%Reduced
Spire Wealth Management159$28.0K0.00%−7−4.2%Reduced
Towarzystwo Funduszy Inwestycyjnych Pzu SA160$28.2K0.01%00.0%Unchanged
Central Trust Co163$28.7K0.00%00.0%Unchanged
First Horizon Corp169$29.7K0.00%+169New
Private Trust Co NA175$30.8K0.00%+20+12.9%Added
Principia Wealth Advisory, LLC185$32.6K0.02%00.0%Unchanged
Root Financial Partners, LLC185$32.6K0.00%+123+198.4%Added
MV Capital Management, Inc.194$34.1K0.00%00.0%Unchanged
Quintet Private Bank (Europe) S.A.195$34.3K0.00%−60−23.5%Reduced
Keating Financial Advisory Services, Inc.195$34.3K0.00%+195New
GoalVest Advisory LLC198$34.8K0.01%+198New
Vision Financial Markets LLC200$35.2K0.04%00.0%Unchanged
ZRC Wealth Management, LLC200$35.2K0.01%+161+412.8%Added
Strive Financial Group ,LLC200$35.2K0.02%+200New
DV Equities, LLC205$36.1K0.01%+205New
WealthCollab, LLC206$36.3K0.01%00.0%Unchanged
Harbour Investments, Inc.215$37.8K0.00%+8+3.9%Added
Meeder Asset Management Inc216$38.0K0.00%+165+323.5%Added
Clear Street Markets LLC219$38.5K0.01%+170+346.9%Added
SHP Wealth Management223$39.2K0.00%+223New