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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, Q1 2026

Institutional positions in Biogen Inc. as of Mar 31, 2026. 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
1,014
+33 vs. Q4 2025
Shares held
135.0M
+15.4M (+12.9%) vs. Q4 2025
Total value
$24.7B
+$3.70B (+17.6%) vs. Q4 2025
New holders
138
401 more added
Sold out
105
290 more reduced

20 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q4 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 holdersQ1 2026: 1,015 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 heldQ1 2026: $24.7B
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, Q1 2026

Shares, value and share of portfolio for each institution holding Biogen Inc.; share changes are against Q4 2025.

Institutions holding BIIB in Q1 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Atlantic Trust, LLC50$9.17K0.00%00.0%Unchanged
Financial Freedom, LLC50$9.17K0.00%00.0%Unchanged
Millstone Evans Group, LLC50$9.17K0.01%00.0%Unchanged
Transamerica Financial Advisors, Inc.50$9.17K0.00%+33+194.1%Added
NBC Securities, Inc.49$8.98K0.00%−36−42.4%Reduced
Cornerstone Financial Management LLC48$8.80K0.01%+9+23.1%Added
Bartlett & Co. Wealth Management LLC47$8.80K0.00%+4+9.3%Added
McIlrath & Eck, LLC43$7.82K0.00%00.0%Unchanged
DT Investment Partners, LLC42$7.70K0.00%00.0%Unchanged
Bank Julius Baer & Co. Ltd, Zurich40$7.35K0.00%00.0%Unchanged
Anchor Investment Management, LLC40$7.33K0.00%00.0%Unchanged
Optiver Holding B.V.39$7.15K0.00%+39New
Webster Bank, N. A.36$6.60K0.00%00.0%Unchanged
Prosperity Bancshares Inc36$6.60K0.01%+15+71.4%Added
Signature Equity Partners, LLC36$6.60K0.00%+32+800.0%Added
Joseph Group Capital Management36$6.60K0.00%+36New
Rosenberg Matthew Hamilton35$6.42K0.00%00.0%Unchanged
GHP Investment Advisors, Inc.35$6.42K0.00%+4+12.9%Added
Sunbelt Securities, Inc.33$6.05K0.00%00.0%Unchanged
Park Place Capital Corp33$6.05K0.00%+22+200.0%Added
Caldwell Sutter Capital, Inc.30$5.50K0.00%00.0%Unchanged
St Germain D J Co Inc30$5.50K0.00%00.0%Unchanged
Barrett & Company, Inc.30$5.50K0.00%00.0%Unchanged
Marquette Asset Management, LLC30$5.50K0.00%00.0%Unchanged
Tower View Investment Management & Research LLC29$5.32K0.00%00.0%Unchanged
Crewe Advisors LLC28$5.13K0.00%+17+154.5%Added
Bangor Savings Bank28$5.13K0.00%00.0%Unchanged
Align Financial, LLC28$5.13K0.00%−4,900−99.4%Reduced
Roble, Belko & Company, Inc25$5.00K0.00%00.0%Unchanged
Pinnacle Bancorp, Inc.27$4.95K0.00%00.0%Unchanged
Hughes Financial Services, LLC27$4.95K0.00%+2+8.0%Added
Cedar Mountain Advisors, LLC27$4.95K0.00%+27New
Abound Wealth Management26$4.72K0.00%00.0%Unchanged
Consultiva Wealth Management, Corp.25$4.58K0.01%00.0%Unchanged
Clear Street Markets LLC24$4.40K0.00%−195−89.0%Reduced
South State Corp.23$4.22K0.00%−10−30.3%Reduced
MidFirst Bank23$4.22K0.00%+13+130.0%Added
Nvest Wealth Strategies, Inc.22$4.03K0.00%+3+15.8%Added
Rakuten Securities, Inc.22$4.03K0.00%−5−18.5%Reduced
Harvest Fund Management Co., Ltd24$4.00K0.00%+24New
Bay Harbor Wealth Management, LLC21$3.85K0.00%+8+61.5%Added
First United Bank Trust20$3.67K0.00%00.0%Unchanged
Colonial Trust Advisors20$3.67K0.00%00.0%Unchanged
Vision Retirement, LLC20$3.67K0.00%00.0%Unchanged
Bank of New Hampshire20$3.67K0.00%+20New
Truvestments Capital LLC19$3.48K0.00%−14−42.4%Reduced
Bare Financial Services, Inc19$3.48K0.00%+6+46.2%Added
Whipplewood Advisors, LLC19$3.48K0.00%+19New
Burk Holdings LLC19$3.48K0.00%+19New
Harbor Investment Advisory, LLC18$3.30K0.00%−44−71.0%Reduced
Ameriflex Group, Inc.18$3.30K0.00%00.0%Unchanged
Rialto Wealth Management, LLC18$3.30K0.00%+6+50.0%Added
Plante Moran Financial Advisors, LLC17$3.12K0.00%00.0%Unchanged
DiNuzzo Private Wealth, Inc.17$3.12K0.00%+3+21.4%Added
Financial Management Professionals, Inc.16$2.93K0.00%00.0%Unchanged
NVWM, LLC16$2.93K0.00%00.0%Unchanged
Darwin Advisors, LLC16$2.93K0.00%00.0%Unchanged
Fortis Group Advisors, LLC15$2.75K0.00%00.0%Unchanged
Lloyd Advisory Services, LLC.15$2.75K0.00%+15New
Activest Wealth Management15$2.75K0.00%+15New
Kingdom Financial Group LLC.15$2.75K0.00%+15New
PlanVest Financial, Inc15$2.75K0.00%+15New
Godfrey Financial Associates, Inc.14$2.57K0.00%00.0%Unchanged
AdvisorNet Financial, Inc14$2.57K0.00%+5+55.6%Added
First Pacific Financial14$2.57K0.00%+14New
Hollencrest Capital Management13$2.38K0.00%00.0%Unchanged
WestEnd Advisors, LLC12$2.20K0.00%00.0%Unchanged
Atwood & Palmer Inc12$2.20K0.00%+7+140.0%Added
American Capital Advisory, LLC11$2.03K0.00%+3+37.5%Added
Bernard Wealth Management Corp.11$2.02K0.00%00.0%Unchanged
Financial Consulate, Inc11$2.02K0.00%+7+175.0%Added
Penserra Capital Management LLC12$2.00K0.00%00.0%Unchanged
Toth Financial Advisory Corp10$1.83K0.00%+10New
Indiana Trust & Investment Management CO10$1.83K0.00%00.0%Unchanged
1 North Wealth Services LLC10$1.83K0.00%00.0%Unchanged
1015 Capital Partners, LLC10$1.83K0.00%00.0%Unchanged
Thurston, Springer, Miller, Herd & Titak, Inc.10$1.83K0.00%00.0%Unchanged
IMA Wealth, Inc.9$1.65K0.00%+9New
Operose Advisors LLC8$1.47K0.00%+8New
Sunrise Financial Services, LLC8$1.47K0.00%+8New
Dunhill Financial, LLC7$1.34K0.00%+2+40.0%Added
Clark Wealth Partners7$1.28K0.00%00.0%Unchanged
Sound Income Strategies, LLC6$1.10K0.00%00.0%Unchanged
Albion Financial Group6$1.10K0.00%00.0%Unchanged
Quaker Wealth Management, LLC6$1.10K0.00%00.0%Unchanged
Valley National Advisers Inc9$1.00K0.00%+1+12.5%Added
Phillip James Consulting Co.4$1.00K0.00%+4New
RMG Wealth Management LLC5$9900.00%−80−94.1%Reduced
Three Bearings Fiduciary Advisors, Inc.5$9170.00%00.0%Unchanged
Evermay Wealth Management LLC5$9170.00%00.0%Unchanged
Geneos Wealth Management Inc.5$9170.00%00.0%Unchanged
Wolff Wiese Magana LLC5$9170.00%00.0%Unchanged
HFM Investment Advisors, LLC5$9170.00%00.0%Unchanged
Chilton Capital Management LLC4$7340.00%00.0%Unchanged
TFC Financial Management4$7340.00%00.0%Unchanged
Breakwater Investment Management4$7340.00%00.0%Unchanged
Retirement Wealth Solutions LLC4$7340.00%+4New
Curio Wealth, LLC4$7330.00%+2+100.0%Added
JPL Wealth Management, LLC3$5510.00%+3New
DecisionPoint Financial, LLC3$5500.00%00.0%Unchanged