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Disclosery

BIIB BIOGEN INC

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Stock (common), issuer CIK 875045

980 managers (1,004 13F filers) reported a position in BIIB shares at 2025-12-31, 139,827,201 shares in all. 137 filers opened a position and 82 filers sold out during the quarter.

Managers
980
13F filers
1,004
New
137
Added
322
Reduced
296
Sold out
82
Shares held by filers
139,827,201

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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
TANG CAPITAL MANAGEMENT LLCin group TANG CAPITAL MANAGEMENT LLC35,000$6.16M0.3%013F-HRTimelineGroup
CIBC Asset Management Inc34,447$6.06M0.01%-10,66613F-HRTimeline
OVERSEA-CHINESE BANKING Corp Ltdin group OVERSEA-CHINESE BANKING Corp …34,366$6.05M0.17%-11,83713F-HR/ATimelineGroup
USS Investment Management Ltd34,216$6.02M0.03%+2,34613F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
North Growth Management Ltd.34,000$6.02M0.94%013F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…34,124$6.01M0.03%-1,08413F-HRTimeline
GRIMES & Co WEALTH MANAGEMENT, LLC33,844$5.96M0.14%-1,45313F-HRTimeline
NorthCrest Asset Manangement, LLC33,787$5.9M0.13%+1,15113F-HRTimeline
AMF Tjanstepension AB33,479$5.89M0.04%013F-HRTimeline
MEITAV INVESTMENT HOUSE LTDin group MEITAV INVESTMENT HOUSE LTD33,462$5.89M0.07%+6213F-HRTimelineGroup
FARMERS TRUST CO33,185$5.84M0.95%+7,21413F-HRTimeline
LEUTHOLD GROUP, LLC32,589$5.74M0.62%+9,07213F-HRTimeline
CWA Asset Management Group, LLC32,534$5.73M0.21%+2,84113F-HRTimeline
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.32,513$5.72M0.05%+1,91313F-HRTimelineGroup
Baader Bank Aktiengesellschaft32,491$5.71M0.48%-23,48313F-HRTimeline
Impax Asset Management Group plcin group Impax Asset Management Group …32,124$5.65M0.04%-93213F-HRTimelineGroup
Retirement Systems of Alabama31,210$5.49M0.02%-6513F-HRTimeline
SIMPLEX TRADING, LLC30,878$5.43M0.15%+29,76213F-HRTimeline
Hillman Capital Management, Inc.30,516$5.37M3.38%-7,83813F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC30,478$5.36M0.02%+5,44213F-HRTimelineGroup
AMALGAMATED BANK30,285$5.33M0.04%+2,50313F-HRTimeline
B. Metzler seel. Sohn & Co. AGin group B. Metzler seel. Sohn & Co. AG29,971$5.27M0.05%+17,48913F-HRTimelineGroup
Insight Wealth Strategies, LLC28,960$5.1M0.58%new13F-HRTimeline
Skandinaviska Enskilda Banken AB (publ)28,748$5.06M0.02%-33513F-HRTimeline
DNB Asset Management ASin group DNB Asset Management AS28,729$5.06M0.02%+51113F-HRTimelineGroup
RITHOLTZ WEALTH MANAGEMENT28,375$4.99M0.09%+16,69513F-HRTimeline
Leonteq Securities AG27,960$4.92M0.26%+4,84313F-HRTimeline
FORSTA AP-FONDEN27,300$4.8M0.03%+2,10013F-HRTimeline
Generali Asset Management SPA SGR27,181$4.78M0.1%-13,74413F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\26,757$4.71M0.01%+5,32413F-HRTimelineGroup
FJARDE AP-FONDEN /FOURTH SWEDISH NATION…26,553$4.67M0.04%-2,40013F-HRTimeline
Nippon Life Global Investors Americas, …26,490$4.66M0.19%new13F-HRTimeline
MACQUARIE GROUP LTDin group MACQUARIE GROUP LTD26,409$4.65M0.02%-27,35213F-HRTimelineGroup
NISSAY ASSET MANAGEMENT CORP /JAPAN26,286$4.63M0.02%-19,18613F-HRTimeline
Daiwa Securities Group Inc.in group Daiwa Securities Group Inc.26,277$4.62M0.02%-17,79813F-HRTimelineGroup
Mubadala Investment Co PJSC26,236$4.62M0.03%new13F-HRTimeline
BRITISH COLUMBIA INVESTMENT MANAGEMENT …25,960$4.57M0.02%+4,90213F-HRTimeline
Swiss Life Asset Management Ltdin group Swiss Life Asset Management L…25,196$4.43M0.02%-15,24913F-HRTimelineGroup
DZ BANK AG Deutsche Zentral Genossensch…in group DZ BANK AG Deutsche Zentral G…24,919$4.39M<0.01%-88,63413F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC24,300$4.28M0.32%+6,30013F-HR/ATimelineGroup
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC24,020$4.23M0.03%-38,64313F-HRTimelineGroup
Utah Retirement Systems23,996$4.22M0.04%013F-HRTimeline
China Universal Asset Management Co., L…23,905$4.21M0.32%-5,66513F-HRTimeline
Old North State Wealth Management, LLC23,809$4.19M1.97%+1,54013F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC23,539$4.14M<0.01%+18,19913F-HRTimelineGroup
Cetera Investment Advisers23,503$4.14M<0.01%+2,61513F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS23,489$4.13M0.01%-14,30413F-HRTimeline
Caprock Group, LLC23,453$4.13M0.09%+17,84213F-HRTimeline
Mn Services Vermogensbeheer B.V.23,300$4.1M0.03%-3,30013F-HRTimeline
XPONANCE LLC23,038$4.05M0.03%+1,71413F-HRTimeline
BANK OF NOVA SCOTIAin group BANK OF NOVA SCOTIA22,695$3.99M0.01%-1,65613F-HRTimelineGroup
Police & Firemen's Retirement System of…22,371$3.94M0.03%-1,22813F-HRTimeline
Focus Partners Wealthgroup of 2 filers holding22,086$3.89M+4,782Timeline
NLB Skladi, upravljanje premozenja, d.o…22,007$3.87M0.18%13F-HRTimeline
CIBC Bancorp USA Inc.group of 2 filers holding22,007$3.87M+20,818Timeline
Atom Investors LP21,720$3.82M0.3%+19,49813F-HRTimeline
New York Life Investment Management LLCin group New York Life Investment Mana…21,310$3.75M0.03%-17413F-HRTimelineGroup
Capula Management Ltdin group Capula Management Ltd21,295$3.75M0.02%+11,08713F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
NorthCoast Asset Management LLC21,133$3.72M0.08%-1,81613F-HRTimeline
NewEdge Advisors, LLC21,048$3.7M0.01%+11,91013F-HRTimeline
Sumitomo Mitsui DS Asset Management Com…in group SUMITOMO MITSUI FINANCIAL GRO…20,422$3.59M0.03%+40113F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson20,252$3.56M<0.01%+1,99213F-HRTimelineGroup
Sivik Global Healthcare LLC20,000$3.52M1.72%new13F-HRTimeline
INSPIRE TRUST CO, N.A.20,000$3.52M0.58%013F-HRTimeline
COMERICA BANK19,475$3.43M0.01%-14,19513F-HRTimeline
Rakuten Group, Inc.group of 2 filers holding19,322$3.42M-179,299Timeline
Public Sector Pension Investment Board19,190$3.38M0.01%+6,34413F-HRTimeline
Fluent Financial, LLC19,144$3.37M1.28%-6,39913F-HRTimeline
IMC-Chicago, LLC19,011$3.35M0.06%new13F-HRTimeline
FIDEURAM - INTESA SANPAOLO PRIVATE BANK…18,873$3.32M0.12%13F-HR/ATimeline
Morningstar Investment Management LLCin group Morningstar Investment Manage…18,779$3.31M0.2%013F-HRTimelineGroup
Kintegral Advisory, LLCin group Kintegral Advisory, LLC18,742$3.3M0.28%-51213F-HRTimelineGroup
Verition Fund Management LLC18,523$3.26M0.02%-11,51413F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC18,394$3.24M<0.01%+37713F-HRTimeline
Leo Wealth, LLC18,133$3.19M0.23%+2113F-HRTimeline
MH & ASSOCIATES SECURITIES MANAGEMENT C…17,598$3.1M2.53%13F-HRTimeline
HOURGLASS CAPITAL, LLC17,550$3.09M0.67%-42013F-HRTimeline
Ilmarinen Mutual Pension Insurance Co17,400$3.06M0.02%-6,60013F-HRTimeline
Horizon Investments, LLC17,382$3.06M0.04%-43,66713F-HRTimeline
CAPTRUST FINANCIAL ADVISORS17,375$3.06M0.01%+84313F-HRTimeline
State of Alaska, Department of Revenue17,187$3.02M0.03%-99513F-HRTimeline
Elo Mutual Pension Insurance Co17,142$3.02M0.05%-4,46013F-HRTimeline
OMERS ADMINISTRATION Corp16,808$2.96M0.02%+11,62813F-HRTimeline
M&T Bank Corpin group M&T Bank Corp16,761$2.95M0.01%+2,10613F-HR/ATimelineGroup
OREGON PUBLIC EMPLOYEES RETIREMENT FUND16,741$2.95M0.04%013F-HRTimeline
SYSTEMATIC FINANCIAL MANAGEMENT LP16,640$2.93M0.07%+11,97013F-HRTimeline
NEOS Investment Management LLC16,534$2.91M0.02%-40,76713F-HRTimeline
UniSuper Management Pty Ltd16,427$2.89M0.02%-3,57413F-HRTimeline
Entropy Technologies, LP16,312$2.87M0.16%+13,89913F-HRTimeline
OP Asset Management Ltd16,246$2.86M0.03%013F-HR/ATimeline
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…15,793$2.78M0.03%-13613F-HRTimelineGroup
Wealthfront Advisers LLC15,551$2.74M0.01%+4,22713F-HRTimeline
GABELLI FUNDS LLCin group GAMCO Investors (Gabelli)15,400$2.71M0.02%+1,30013F-HRTimelineGroup
CLARK ESTATES INC/NY15,300$2.69M0.65%013F-HRTimeline
Element Squared LLC15,051$2.65M1.44%new13F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC15,920$2.63M0.03%-1,15613F-HRTimeline
FULLER & THALER ASSET MANAGEMENT, INC.14,899$2.62M0.01%013F-HR/ATimeline
BOKF, NAin group BOKF, NA14,868$2.62M0.04%-5,41213F-HRTimelineGroup
Avanza Fonder AB14,743$2.59M0.07%-54413F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.14,447$2.54M<0.01%+2,85413F-HRTimelineGroup
Fieldview Capital Management, LLC14,272$2.51M0.43%new13F-HRTimeline
PROFUND ADVISORS LLC14,200$2.5M0.08%-9,93113F-HRTimeline
STONERIDGE INVESTMENT PARTNERS LLC14,116$2.48M1.73%-48313F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…13,987$2.46M<0.01%-68,10413F-HRTimelineGroup
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …14,022$2.46M<0.01%-118,56113F-HRTimelineGroup
Pathstone Holdings, LLCin group Pathstone Holdings, LLC13,808$2.43M0.01%+82413F-HRTimelineGroup
EVOKE WEALTH, LLC13,543$2.38M0.05%+17113F-HRTimeline
Camarda Financial Advisors, LLC13,257$2.33M0.89%new13F-HRTimeline
Maven Securities LTDin group Maven Securities LTD13,069$2.3M0.29%new13F-HRTimelineGroup
Kentucky Retirement Systemsgroup of 2 filers holding13,015$2.29M0Timeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP12,825$2.26M<0.01%+3,96913F-HRTimelineGroup
BEACON INVESTMENT ADVISORY SERVICES, IN…12,674$2.23M0.09%-25613F-HR/ATimeline
Provident Co of the Employees of the He…12,529$2.2M2.29%013F-HRTimeline
Federation des caisses Desjardins du Qu…12,348$2.17M0.01%+1,77313F-HRTimeline
Investment Management Corp of Ontario12,342$2.17M0.03%+2,95513F-HRTimeline
Twin Tree Management, LP12,270$2.16M0.22%new13F-HRTimeline
Convergence Investment Partners, LLC12,156$2.14M0.43%+2,57313F-HRTimeline
TRIGLAV INVESTMENTS, D.O.O.12,130$2.13M0.13%-6,00013F-HRTimeline
HighTower Advisors, LLC11,959$2.1M<0.01%+1,84313F-HRTimeline
Pallas Capital Advisors LLC11,783$2.07M0.07%+15813F-HRTimeline
Janney Montgomery Scott LLC11,775$2.07M<0.01%-6,92813F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…11,669$2.05M0.01%013F-HRTimeline
Orion Porfolio Solutions, LLC11,440$2.01M0.01%+6,61213F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…11,437$2.01M0.02%013F-HRTimeline
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP11,407$2.01M<0.01%+2,45013F-HRTimelineGroup
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC11,404$2.01M<0.01%+42613F-HRTimelineGroup
Catalyst Funds Management Pty Ltd11,400$2.01M0.47%new13F-HRTimeline
NORTHWESTERN MUTUAL INVESTMENT MANAGEME…group of 2 filers holding11,271$1.98M+668Timeline
Summit Financial, LLC11,139$1.96M0.03%new13F-HRTimeline
MIZUHO SECURITIES USA LLCin group MIZUHO FINANCIAL GROUP INC10,682$1.95M0.03%+413F-HRTimelineGroup
Generali Investments, Management Co LLC10,974$1.93M0.38%+1,00413F-HRTimeline
SIG BROKERAGE, LP10,922$1.92M0.65%+6,14113F-HRTimeline
Pinnacle Financial Partners, Inc.in group Pinnacle Financial Partners, …10,909$1.92M0.01%13F-HR/ATimelineGroup
Ensign Peak Advisors, Inc10,676$1.88M<0.01%-24,11013F-HR/ATimeline
Sequoia Financial Advisors, LLC10,564$1.86M0.01%+1,46813F-HRTimeline
Merit Financial Group, LLC10,517$1.85M0.01%+2,15013F-HRTimeline
Aster Capital Management (DIFC) Ltd10,487$1.85M0.81%new13F-HRTimeline
WINTON GROUP Ltdin group WINTON GROUP Ltd10,145$1.79M0.06%new13F-HRTimelineGroup
Crossmark Global Holdings, Inc.10,094$1.78M0.03%+6,43613F-HRTimeline
Krensavage Asset Management, LLC10,000$1.76M0.62%013F-HRTimeline
K.J. Harrison & Partners Inc10,000$1.76M0.23%-613F-HRTimeline
GLENMEDE TRUST CO NAin group GLENMEDE TRUST CO NA9,919$1.75M0.01%13F-HRTimelineGroup
JACOBS LEVY EQUITY MANAGEMENT, INC9,873$1.74M0.01%-25113F-HRTimeline
Vontobel Holding Ltd.in group Vontobel Holding Ltd.9,841$1.73M0.01%-10,14713F-HRTimelineGroup
Baird Financial Group, Inc.in group Baird Financial Group, Inc.9,691$1.71M<0.01%-3,05713F-HRTimelineGroup
ALLSTATE CORPin group ALLSTATE CORP9,672$1.7M0.02%+4,97213F-HRTimelineGroup
GREAT LAKES ADVISORS, LLC9,490$1.67M0.01%+1113F-HRTimeline
ICICI Prudential Asset Management Co Ltd9,462$1.67M0.19%-12,24113F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…9,212$1.62M0.01%+20213F-HRTimelineGroup
Norinchukin Bank, Thein group Norinchukin Bank, The9,186$1.62M0.02%-3,44213F-HRTimelineGroup
PensionDanmark Pensionsforsikringsaktie…9,162$1.61M0.01%13F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC9,003$1.58M0.03%+16613F-HRTimeline
Callan Family Office, LLC8,995$1.58M0.03%+6,84313F-HRTimeline
AUXIER ASSET MANAGEMENT LLC8,911$1.57M0.22%-1,25113F-HRTimeline
Abacus Wealth Partners, LLC8,768$1.54M0.15%new13F-HRTimeline
QUADRANT CAPITAL GROUP LLC8,664$1.52M0.05%+13613F-HRTimeline
Sterling Capital Management LLC8,661$1.52M0.02%-37113F-HRTimeline
LMR Partners LLPin group LMR Partners LLP8,630$1.52M0.01%new13F-HRTimelineGroup
M&G PLCin group M&G PLC8,593$1.51M0.01%013F-HRTimelineGroup
HARTFORD INVESTMENT MANAGEMENT CO8,501$1.5M0.04%-12113F-HRTimeline
EMERALD ADVISERS, LLCgroup of 2 filers holding8,492$1.49M+1,622Timeline
Missouri Trust & Investment Co8,490$1.49M0.44%+6513F-HRTimeline
BLAIR WILLIAM & CO/IL8,443$1.49M<0.01%-5,57713F-HRTimeline
GROUPAMA ASSET MANAGMENT8,431$1.48M0.02%-9313F-HRTimeline
KEYBANK NATIONAL ASSOCIATION/OHin group KEYBANK NATIONAL ASSOCIATION/…8,418$1.48M0.01%+16413F-HRTimelineGroup
THOR INVESTMENT MANAGEMENT INC /OH/ /ADV8,314$1.46M0.84%+7613F-HRTimeline
AG2R LA MONDIALE GESTION D'ACTIFS8,264$1.45M0.06%new13F-HRTimeline
MML INVESTORS SERVICES, LLC8,225$1.45M<0.01%+93913F-HRTimeline
Cairn Investment Group, Inc.8,096$1.43M0.68%-10813F-HRTimeline
WHITTIER TRUST CO OF NEVADA INC7,708$1.41M0.03%-1313F-HRTimeline
Canada Post Corp Registered Pension Plan7,973$1.4M0.05%+78013F-HRTimeline
Gulf International Bank (UK) Ltd7,901$1.39M0.05%-2313F-HRTimeline
Jacobi Capital Management LLC7,836$1.38M0.08%-28913F-HRTimeline
Cambridge Investment Research Advisors,…7,819$1.38M<0.01%+3,47813F-HRTimeline
Krilogy Financial LLC7,706$1.33M0.05%-113F-HRTimeline
Sompo Asset Management Co., Ltd.7,576$1.33M0.23%+4,33613F-HRTimeline
North Dakota State Investment Board7,575$1.33M0.05%13F-HRTimeline
Louisiana State Employees Retirement Sy…7,500$1.32M0.02%-10,90013F-HRTimeline
Maryland State Retirement & Pension Sys…7,381$1.3M0.03%013F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …7,286$1.3M<0.01%+26413F-HRTimelineGroup
Linden Thomas Advisory Services, LLC7,264$1.28M0.13%-32913F-HRTimeline
Metis Global Partners, LLC7,211$1.27M0.03%+88713F-HRTimeline
BROWN ADVISORY INCin group BROWN ADVISORY INC7,191$1.27M<0.01%-2213F-HRTimelineGroup
STABLEFORD CAPITAL II LLC6,914$1.22M0.44%new13F-HRTimeline
CITIZENS & NORTHERN CORPin group CITIZENS & NORTHERN CORP6,912$1.22M0.3%-8413F-HRTimelineGroup
VestGen Advisors, LLC6,884$1.21M0.05%new13F-HRTimeline
GF FUND MANAGEMENT CO. LTD.6,880$1.21M0.02%-29,52913F-HRTimeline
NEW MEXICO EDUCATIONAL RETIREMENT BOARD6,824$1.2M0.04%+20013F-HRTimeline
Laird Norton Wetherby Trust Company, LLCin group Laird Norton Wetherby Trust C…6,820$1.2M0.02%new13F-HRTimelineGroup
World Investment Advisors6,739$1.19M0.02%+31713F-HR/ATimeline
PARAGON CAPITAL MANAGEMENT INC6,686$1.18M0.91%new13F-HRTimeline
BANK OF HAWAII6,667$1.17M0.06%new13F-HRTimeline
Osmosis Investment Management UK Ltd6,635$1.17M0.03%13F-HRTimeline
J. Safra Sarasin Holding AGin group J. Safra Sarasin Holding AG6,474$1.14M0.02%-2,60713F-HRTimelineGroup
COMMERCE BANKin group COMMERCE BANK6,378$1.12M0.01%+2113F-HRTimelineGroup
denkapparat Operations GmbH6,338$1.12M0.61%013F-HRTimeline
GREENLEAF TRUST6,309$1.11M0.01%+19013F-HRTimeline
Ballentine Partners, LLC6,305$1.11M0.02%+36413F-HRTimeline
NICOLET BANKSHARES INCgroup of 2 filers holding6,084$1.11M+489Timeline
MOGY JOEL R INVESTMENT COUNSEL INC6,260$1.1M0.06%013F-HRTimeline