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Disclosery

BIIB BIOGEN INC

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Stock (common), issuer CIK 875045

983 managers (1,014 13F filers) reported a position in BIIB shares at 2026-03-31, 135,049,061 shares in all. 113 filers opened a position and 107 filers sold out during the quarter.

Managers
983
13F filers
1,014
New
113
Added
402
Reduced
290
Sold out
107
Shares held by filers
135,049,061

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
Generali Asset Management SPA SGR34,194$6.27M0.13%+7,01313F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…34,186$6.27M0.03%+6213F-HRTimeline
Ensign Peak Advisors, Inc33,710$6.18M0.01%+23,03413F-HR/ATimeline
FARMERS TRUST CO33,610$6.16M0.97%+42513F-HRTimeline
Kentucky Retirement Systemsgroup of 2 filers holding23,346$6.16M+10,331Timeline
Nippon Life Global Investors Americas, …33,570$6.15M0.28%+7,08013F-HRTimeline
LEUTHOLD GROUP, LLC33,143$6.08M0.65%+55413F-HRTimeline
QRG CAPITAL MANAGEMENT, INC.33,002$6.05M0.06%+29,20713F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…32,716$6M0.01%+23,50413F-HRTimelineGroup
Lighthouse Investment Partners, LLCin group Lighthouse Investment Partner…32,632$5.98M0.22%+26,84413F-HRTimelineGroup
Swiss Life Asset Management Ltdin group Swiss Life Asset Management L…31,288$5.74M0.03%+6,09213F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\31,223$5.72M0.01%+4,46613F-HRTimelineGroup
DNB Asset Management ASin group DNB Asset Management AS31,221$5.72M0.02%+2,49213F-HRTimelineGroup
Retirement Systems of Alabama31,166$5.71M0.02%-4413F-HRTimeline
Baader Bank Aktiengesellschaft30,801$5.64M0.56%-1,69013F-HRTimeline
Focus Partners Wealthgroup of 2 filers holding29,993$5.51M+7,907Timeline
NISSAY ASSET MANAGEMENT CORP /JAPAN29,762$5.46M0.03%+3,47613F-HRTimeline
AMALGAMATED BANK29,762$5.46M0.04%-52313F-HRTimeline
B. Metzler seel. Sohn & Co. AGin group B. Metzler seel. Sohn & Co. AG29,725$5.45M0.05%-24613F-HRTimelineGroup
Hillman Capital Management, Inc.29,540$5.42M3.76%-97613F-HRTimeline
Insight Wealth Strategies, LLC29,346$5.38M0.6%+38613F-HRTimeline
Impax Asset Management Group plcin group Impax Asset Management Group …28,728$5.27M0.04%-3,39613F-HRTimelineGroup
PEAK6 LLCin group PEAK6 LLC28,166$5.16M0.15%new13F-HRTimelineGroup
Daiwa Securities Group Inc.in group Daiwa Securities Group Inc.27,136$4.97M0.01%+85913F-HRTimelineGroup
XPONANCE LLC26,456$4.85M0.03%+3,41813F-HRTimeline
Leonteq Securities AG26,454$4.85M0.29%-1,50613F-HRTimeline
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC26,382$4.84M0.04%+2,36213F-HRTimelineGroup
China Universal Asset Management Co., L…26,044$4.77M0.36%+2,13913F-HRTimeline
Caprock Group, LLC25,651$4.7M0.11%+2,19813F-HRTimeline
Atom Investors LP24,749$4.54M0.32%+3,02913F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP24,554$4.51M<0.01%+11,72913F-HRTimelineGroup
Old North State Wealth Management, LLC24,595$4.51M2.09%+78613F-HRTimeline
NorthCrest Asset Manangement, LLC25,012$4.44M0.14%-8,77513F-HRTimeline
Munich Reinsurance Co Stock Corp in Mun…23,942$4.39M0.11%new13F-HRTimeline
Public Sector Pension Investment Board23,792$4.36M0.01%+4,60213F-HRTimeline
Utah Retirement Systems23,714$4.35M0.04%-28213F-HRTimeline
Mn Services Vermogensbeheer B.V.23,300$4.27M0.03%013F-HRTimeline
CREDIT AGRICOLE S Ain group CREDIT AGRICOLE S A22,985$4.21M0.01%-53,79013F-HRTimelineGroup
DZ BANK AG Deutsche Zentral Genossensch…in group DZ BANK AG Deutsche Zentral G…22,926$4.2M<0.01%-1,99313F-HRTimelineGroup
Leo Wealth, LLC22,737$4.17M0.3%+4,60413F-HRTimeline
Police & Firemen's Retirement System of…22,477$4.12M0.04%+10613F-HRTimeline
Cetera Investment Advisers22,444$4.11M<0.01%-1,05913F-HRTimeline
Rakuten Group, Inc.group of 2 filers holding21,800$4.09M+2,478Timeline
New York Life Investment Management LLCin group New York Life Investment Mana…21,905$4.02M0.03%+59513F-HRTimelineGroup
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.21,902$4.02M0.05%-10,61113F-HRTimelineGroup
Empowered Funds, LLC21,775$3.99M0.03%-36,18613F-HR/ATimeline
SummitTX Capital, L.P.21,656$3.97M0.13%new13F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS21,299$3.9M0.02%-2,19013F-HRTimeline
MEITAV INVESTMENT HOUSE LTDin group MEITAV INVESTMENT HOUSE LTD20,972$3.84M0.04%-12,49013F-HRTimelineGroup
NorthCoast Asset Management LLC20,940$3.84M0.09%-19313F-HRTimeline
NEOS Investment Management LLC20,840$3.82M0.02%+4,30613F-HRTimeline
Sumitomo Mitsui DS Asset Management Com…in group SUMITOMO MITSUI FINANCIAL GRO…20,489$3.76M0.03%+6713F-HRTimelineGroup
BANK OF NOVA SCOTIAin group BANK OF NOVA SCOTIA20,436$3.75M0.01%-2,25913F-HRTimelineGroup
BRITISH COLUMBIA INVESTMENT MANAGEMENT …20,217$3.71M0.02%-5,74313F-HRTimeline
OMERS ADMINISTRATION Corp20,149$3.69M0.02%+3,34113F-HRTimeline
Canal Insurance CO20,000$3.67M0.79%new13F-HRTimeline
Krensavage Asset Management, LLC20,000$3.67M1.43%+10,00013F-HRTimeline
INSPIRE TRUST CO, N.A.20,000$3.67M0.57%013F-HRTimeline
Federation des caisses Desjardins du Qu…19,581$3.59M0.01%+7,23313F-HRTimeline
CAPTRUST FINANCIAL ADVISORS19,577$3.59M0.01%+2,20213F-HRTimeline
Cinctive Capital Management LP19,349$3.55M0.23%-32,82413F-HRTimeline
Morningstar Investment Management LLCin group Morningstar Investment Manage…19,344$3.55M0.22%+56513F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson18,975$3.48M<0.01%-1,27713F-HR/ATimelineGroup
Artia Global Partners LP18,437$3.38M0.76%new13F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC18,102$3.32M<0.01%-29213F-HRTimeline
Kintegral Advisory, LLCin group Kintegral Advisory, LLC17,946$3.29M0.31%-79613F-HRTimelineGroup
Elo Mutual Pension Insurance Co17,727$3.25M0.05%+58513F-HRTimeline
MH & ASSOCIATES SECURITIES MANAGEMENT C…17,717$3.25M2.83%+11913F-HRTimeline
Fieldview Capital Management, LLC17,659$3.24M0.95%+3,38713F-HRTimeline
ALLSTATE CORPin group ALLSTATE CORP17,555$3.22M0.03%+7,88313F-HRTimelineGroup
State of Alaska, Department of Revenue17,507$3.21M0.03%+32013F-HRTimeline
Ilmarinen Mutual Pension Insurance Co17,400$3.19M0.03%013F-HRTimeline
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC16,935$3.1M0.01%-29,18813F-HRTimelineGroup
OREGON PUBLIC EMPLOYEES RETIREMENT FUND16,841$3.09M0.04%+10013F-HRTimeline
M&T Bank Corpin group M&T Bank Corp16,224$2.97M0.01%-53713F-HR/ATimelineGroup
SYSTEMATIC FINANCIAL MANAGEMENT LP16,220$2.97M0.07%-42013F-HRTimeline
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …16,586$2.96M<0.01%+2,56413F-HRTimelineGroup
FIDEURAM - INTESA SANPAOLO PRIVATE BANK…15,973$2.93M0.1%-2,90013F-HRTimeline
DARK FOREST CAPITAL MANAGEMENT LP15,736$2.88M0.26%new13F-HRTimeline
Wealthfront Advisers LLC15,679$2.87M0.01%+12813F-HRTimeline
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…15,656$2.87M0.03%-13713F-HRTimelineGroup
UniSuper Management Pty Ltd15,572$2.85M0.02%-85513F-HRTimeline
CLARK ESTATES INC/NY15,300$2.8M0.67%013F-HRTimeline
OP Asset Management Ltd15,263$2.8M0.03%-98313F-HR/ATimeline
FULLER & THALER ASSET MANAGEMENT, INC.15,239$2.79M0.01%+34013F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC15,206$2.79M0.03%-71413F-HRTimeline
Sivik Global Healthcare LLC15,000$2.75M2.09%-5,00013F-HRTimeline
DYMON ASIA CAPITAL (SINGAPORE) PTE. LTD.in group DYMON ASIA CAPITAL (SINGAPORE…15,000$2.75M0.6%new13F-HRTimelineGroup
Pathstone Holdings, LLCin group Pathstone Holdings, LLC14,908$2.73M0.01%+1,10013F-HRTimelineGroup
Avanza Fonder AB14,621$2.68M0.07%-12213F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC14,268$2.62M0.06%new13F-HRTimeline
Horizon Investments, LLC14,244$2.61M0.03%-3,13813F-HRTimeline
GABELLI FUNDS LLCin group GAMCO Investors (Gabelli)14,100$2.58M0.02%-1,30013F-HRTimelineGroup
EVOKE WEALTH, LLC13,831$2.54M0.05%+28813F-HRTimeline
Vontobel Holding Ltd.in group Vontobel Holding Ltd.13,710$2.51M0.01%+3,86913F-HRTimelineGroup
Convergence Investment Partners, LLC13,557$2.49M0.41%+1,40113F-HRTimeline
NewEdge Advisors, LLC13,031$2.39M0.01%-8,01713F-HR/ATimeline
BLAIR WILLIAM & CO/IL12,854$2.36M0.01%+4,41113F-HRTimeline
TRIGLAV INVESTMENTS, D.O.O.12,428$2.28M0.16%+29813F-HRTimeline
BEACON INVESTMENT ADVISORY SERVICES, IN…12,314$2.26M0.09%-36013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.12,005$2.2M<0.01%-2,44213F-HRTimelineGroup
Catalyst Funds Management Pty Ltd11,970$2.19M0.37%+57013F-HRTimeline
Pallas Capital Advisors LLC11,963$2.19M0.08%+18013F-HRTimeline
PROFUND ADVISORS LLC11,961$2.19M0.08%-2,23913F-HRTimeline
NORTHWESTERN MUTUAL INVESTMENT MANAGEME…group of 2 filers holding11,742$2.15M+471Timeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…11,669$2.14M0.01%013F-HRTimeline
GLENMEDE TRUST CO NAin group GLENMEDE TRUST CO NA11,652$2.14M0.01%+1,73313F-HRTimelineGroup
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC11,651$2.14M<0.01%+24713F-HRTimelineGroup
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP11,566$2.12M<0.01%+15913F-HRTimelineGroup
Gulf International Bank (UK) Ltd11,440$2.1M0.05%+3,53913F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…11,437$2.1M0.02%013F-HRTimeline
Merit Financial Group, LLC11,430$2.1M0.02%+91313F-HRTimeline
MML INVESTORS SERVICES, LLC11,340$2.08M0.01%+3,11513F-HRTimeline
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC11,000$2.02M0.12%-13,30013F-HRTimelineGroup
PensionDanmark Pensionsforsikringsaktie…10,994$2.02M0.02%+1,83213F-HRTimeline
Investment Management Corp of Ontario10,534$1.93M0.02%-1,80813F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC10,469$1.92M<0.01%-13,07013F-HRTimelineGroup
Missouri Trust & Investment Co10,380$1.9M0.56%+1,89013F-HRTimeline
Graham Capital Management, L.P.10,342$1.9M0.06%new13F-HRTimeline
K.J. Harrison & Partners Inc10,000$1.83M0.3%013F-HRTimeline
Crossmark Global Holdings, Inc.9,961$1.83M0.03%-13313F-HRTimeline
Sequoia Financial Advisors, LLC9,953$1.82M0.01%-61113F-HRTimeline
Pinnacle Financial Partners, Inc.in group Pinnacle Financial Partners, …9,925$1.82M0.01%-98413F-HRTimelineGroup
THOR INVESTMENT MANAGEMENT INC /OH/ /ADV9,921$1.82M0.97%+1,60713F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC9,808$1.8M0.04%+80513F-HRTimeline
BOKF, NAin group BOKF, NA9,719$1.78M0.03%-5,14913F-HRTimelineGroup
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…9,715$1.78M<0.01%-4,27213F-HRTimelineGroup
GREAT LAKES ADVISORS, LLC9,490$1.74M0.01%013F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP9,444$1.73M<0.01%-242,31913F-HRTimelineGroup
AIA Group Ltdin group AIA Group Ltd9,329$1.71M0.02%+7,05413F-HRTimelineGroup
Norinchukin Bank, Thein group Norinchukin Bank, The9,220$1.69M0.02%+3413F-HRTimelineGroup
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…9,220$1.69M<0.01%-33,52213F-HRTimeline
Abacus Wealth Partners, LLC9,153$1.68M0.15%+38513F-HRTimeline
EMERALD ADVISERS, LLCgroup of 2 filers holding9,144$1.68M+652Timeline
Farringdon Capital, Ltd.9,054$1.66M0.36%new13F-HRTimeline
MIZUHO SECURITIES USA LLCin group MIZUHO FINANCIAL GROUP INC8,872$1.63M0.04%-1,81013F-HRTimelineGroup
AUXIER ASSET MANAGEMENT LLC8,869$1.63M0.23%-4213F-HRTimeline
KEYBANK NATIONAL ASSOCIATION/OHin group KEYBANK NATIONAL ASSOCIATION/…8,834$1.62M0.01%+41613F-HRTimelineGroup
Sompo Asset Management Co., Ltd.8,776$1.61M0.3%+1,20013F-HRTimeline
GROUPAMA ASSET MANAGMENT8,753$1.6M0.02%+32213F-HRTimeline
M&G PLCin group M&G PLC8,593$1.57M0.01%013F-HRTimelineGroup
MACQUARIE GROUP LTDin group MACQUARIE GROUP LTD8,512$1.56M0.01%-17,89713F-HRTimelineGroup
Orion Porfolio Solutions, LLC8,497$1.56M0.01%-2,94313F-HRTimeline
HARTFORD INVESTMENT MANAGEMENT CO8,401$1.54M0.05%-10013F-HRTimeline
AG2R LA MONDIALE GESTION D'ACTIFS8,375$1.54M0.07%+11113F-HRTimeline
QUADRANT CAPITAL GROUP LLC8,168$1.5M0.04%-49613F-HR/ATimeline
BRIGHTON JONES LLC8,051$1.48M0.03%new13F-HR/ATimeline
Cairn Investment Group, Inc.8,043$1.48M0.73%-5313F-HRTimeline
Banque Cantonale Vaudoisein group Banque Cantonale Vaudoise7,928$1.45M0.05%+4,46613F-HRTimelineGroup
BI Asset Management Fondsmaeglerselskab…in group BI Asset Management Fondsmaeg…7,886$1.45M0.02%+2,31513F-HRTimelineGroup
Jacobi Capital Management LLC7,649$1.4M0.08%-18713F-HRTimeline
Integrated Wealth Concepts LLC7,616$1.4M0.01%+4,89013F-HRTimeline
Louisiana State Employees Retirement Sy…7,500$1.37M0.02%013F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …7,322$1.35M<0.01%+3613F-HRTimelineGroup
Brooklyn Investment Group7,323$1.34M0.04%+1,62113F-HRTimeline
GF FUND MANAGEMENT CO. LTD.7,293$1.34M0.02%+41313F-HRTimeline
Krilogy Financial LLC7,590$1.34M0.04%-11613F-HRTimeline
WHITTIER TRUST CO OF NEVADA INC7,723$1.33M0.03%+1513F-HRTimeline
Sigma Planning Corp7,201$1.32M0.04%+1,95513F-HRTimeline
JUPITER ASSET MANAGEMENT LTDin group JUPITER ASSET MANAGEMENT LTD7,141$1.31M0.01%new13F-HRTimelineGroup
CITIZENS & NORTHERN CORPin group CITIZENS & NORTHERN CORP7,137$1.31M0.33%+22513F-HRTimelineGroup
Generali Investments, Management Co LLC7,112$1.3M0.3%-3,86213F-HRTimeline
Maryland State Retirement & Pension Sys…7,095$1.3M0.03%-28613F-HRTimeline
COMMERCE BANKin group COMMERCE BANK7,074$1.3M0.01%+69613F-HRTimelineGroup
STONERIDGE INVESTMENT PARTNERS LLC7,029$1.29M0.93%-7,08713F-HRTimeline
Canada Post Corp Registered Pension Plan6,973$1.28M0.05%-1,00013F-HRTimeline
Assenagon Asset Management S.A.6,969$1.28M<0.01%+76913F-HRTimeline
Kennondale Capital Management LLC6,967$1.28M0.92%+4,20713F-HRTimeline
STABLEFORD CAPITAL II LLC6,904$1.27M0.47%-1013F-HRTimeline
Laird Norton Wetherby Trust Company, LLCin group Laird Norton Wetherby Trust C…6,899$1.26M0.03%+7913F-HRTimelineGroup
Summit Trail Advisors, LLC6,886$1.26M0.02%+1,48513F-HRTimeline
BROWN ADVISORY INCin group BROWN ADVISORY INC6,844$1.25M<0.01%-34713F-HRTimelineGroup
BANK OF HAWAII6,839$1.25M0.07%+17213F-HRTimeline
Ascent Group, LLCin group Ascent Group, LLC6,836$1.25M0.04%+80213F-HRTimelineGroup
NEW MEXICO EDUCATIONAL RETIREMENT BOARD6,824$1.25M0.04%013F-HRTimeline
UNITED CAPITAL FINANCIAL ADVISORS, LLCin group UNITED CAPITAL FINANCIAL ADVI…6,786$1.24M0.01%+53113F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…6,761$1.24M<0.01%+1,75413F-HRTimelineGroup
North Dakota State Investment Board6,670$1.22M0.05%-90513F-HRTimeline
Osmosis Investment Management UK Ltd6,652$1.22M0.03%+1713F-HRTimeline
Kathmere Capital Management, LLC6,643$1.22M0.08%+1,85213F-HRTimeline
NICOLET BANKSHARES INCin group NICOLET BANKSHARES INC6,516$1.2M0.04%+4,34713F-HRTimelineGroup
Callan Family Office, LLC6,499$1.19M0.03%-2,49613F-HRTimeline
Sagewood Asset Management LP6,493$1.19M0.37%+59413F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC6,479$1.19M0.01%+2,91113F-HRTimelineGroup
Advisors Asset Management, Inc.6,431$1.18M0.02%+21913F-HRTimeline
TOKIO MARINE ASSET MANAGEMENT CO LTDin group TOKIO MARINE HOLDINGS, INC.6,428$1.18M0.04%+85913F-HRTimelineGroup
GREENLEAF TRUST6,371$1.17M0.01%+6213F-HRTimeline
Ballentine Partners, LLC6,350$1.16M0.02%+4513F-HRTimeline
denkapparat Operations GmbH6,338$1.16M0.48%013F-HRTimeline
HUSSMAN STRATEGIC ADVISORS, INC.6,300$1.15M0.25%new13F-HRTimeline
BROWN BROTHERS HARRIMAN & COin group BROWN BROTHERS HARRIMAN & CO6,293$1.15M0.01%+1,30913F-HRTimelineGroup
SCOTIA CAPITAL INC.6,274$1.15M<0.01%new13F-HRTimeline
MOGY JOEL R INVESTMENT COUNSEL INC6,260$1.15M0.07%013F-HRTimeline
Mediolanum International Funds Ltd6,054$1.14M0.01%new13F-HRTimeline
Metis Global Partners, LLC6,176$1.13M0.03%-1,03513F-HRTimeline
World Investment Advisors6,082$1.12M0.02%-65713F-HRTimeline
Bridgefront Capital, LLC6,010$1.1M0.27%new13F-HRTimeline
GAMMA Investing LLC5,993$1.1M0.05%+47713F-HRTimeline
ABN AMRO INVESTMENT SOLUTIONSin group ABN AMRO INVESTMENT SOLUTIONS5,976$1.1M0.01%+1,15013F-HRTimelineGroup
Friedenthal Financial5,930$1.09M0.55%new13F-HRTimeline