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Disclosery

BIIB BIOGEN INC

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Stock (common), issuer CIK 875045

889 managers (910 13F filers) reported a position in BIIB shares at 2025-09-30, 131,320,309 shares in all. 117 filers opened a position and 72 filers sold out during the quarter.

Managers
889
13F filers
910
New
117
Added
324
Reduced
269
Sold out
72
Shares held by filers
131,320,309

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, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, 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
GRIMES & Co WEALTH MANAGEMENT, LLC35,297$4.94M0.12%-5,72713F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…35,208$4.93M0.02%-72913F-HRTimeline
TANG CAPITAL MANAGEMENT LLCin group TANG CAPITAL MANAGEMENT LLC35,000$4.9M0.19%013F-HRTimelineGroup
Corient Private Wealth LPin group Corient Private Wealth LP34,862$4.88M0.01%+53113F-HRTimelineGroup
Ensign Peak Advisors, Inc34,786$4.87M0.01%-97513F-HR/ATimeline
North Growth Management Ltd.34,000$4.73M0.82%013F-HRTimeline
COMERICA BANK33,670$4.72M0.02%+12,56113F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…33,511$4.69M0.07%+20,05513F-HRTimelineGroup
AMF Tjanstepension AB33,479$4.69M0.03%-25,63613F-HR/ATimeline
MEITAV INVESTMENT HOUSE LTDin group MEITAV INVESTMENT HOUSE LTD33,400$4.68M0.06%013F-HRTimelineGroup
Impax Asset Management Group plcin group Impax Asset Management Group …33,056$4.63M0.03%-47013F-HRTimelineGroup
ExodusPoint Capital Management, LP31,931$4.47M0.06%-97,56013F-HRTimeline
USS Investment Management Ltd31,870$4.46M0.02%013F-HRTimeline
Retirement Systems of Alabama31,275$4.38M0.01%-16713F-HRTimeline
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.30,600$4.29M0.04%-6,51713F-HRTimelineGroup
Verition Fund Management LLC30,037$4.21M0.02%+6,72413F-HRTimeline
CWA Asset Management Group, LLC29,693$4.16M0.15%+3,08213F-HRTimeline
China Universal Asset Management Co., L…29,570$4.14M0.34%-3,18713F-HRTimeline
Skandinaviska Enskilda Banken AB (publ)29,083$4.07M0.02%-38,14813F-HRTimeline
FJARDE AP-FONDEN /FOURTH SWEDISH NATION…28,953$4.06M0.03%+1,53213F-HRTimeline
DNB Asset Management ASin group DNB Asset Management AS28,218$3.95M0.01%+79113F-HRTimelineGroup
Lighthouse Investment Partners, LLCin group Lighthouse Investment Partner…28,000$3.92M0.14%new13F-HRTimelineGroup
AMALGAMATED BANK27,782$3.89M0.03%-51813F-HRTimeline
CIBC Bancorp USA Inc.group of 2 filers holding26,782$3.75M+25,682Timeline
Mn Services Vermogensbeheer B.V.26,600$3.73M0.02%013F-HRTimeline
FARMERS TRUST CO25,971$3.64M0.63%-3,55613F-HRTimeline
Glenmede Investment Management, LP25,891$3.63M0.02%-44913F-HRTimeline
Fluent Financial, LLC25,543$3.58M1.4%new13F-HRTimeline
FORSTA AP-FONDEN25,200$3.53M0.02%+1,00013F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC25,036$3.51M0.01%+3,05213F-HRTimelineGroup
BANK OF NOVA SCOTIAin group BANK OF NOVA SCOTIA24,351$3.41M0.01%+8,01713F-HRTimelineGroup
PROFUND ADVISORS LLC24,131$3.38M0.11%-3,04313F-HRTimeline
Ilmarinen Mutual Pension Insurance Co24,000$3.36M0.03%013F-HRTimeline
Utah Retirement Systems23,996$3.36M0.03%013F-HRTimeline
Police & Firemen's Retirement System of…23,599$3.31M0.03%+1,24113F-HRTimeline
LEUTHOLD GROUP, LLC23,517$3.29M0.36%new13F-HRTimeline
Leonteq Securities AG23,117$3.24M0.17%-85,75113F-HRTimeline
NorthCoast Asset Management LLC22,949$3.21M0.01%+4,62813F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO22,831$3.2M<0.01%+80313F-HRTimelineGroup
Old North State Wealth Management, LLC22,269$3.12M1.46%+2,04513F-HRTimeline
AIA Group Ltdin group AIA Group Ltd22,161$3.1M0.05%+15,30913F-HRTimelineGroup
ICICI Prudential Asset Management Co Ltd21,703$3.04M0.32%+41513F-HRTimeline
Elo Mutual Pension Insurance Co21,602$3.03M0.05%+3,66813F-HRTimeline
New York Life Investment Management LLCin group New York Life Investment Mana…21,484$3.01M0.03%-85213F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\21,433$3M<0.01%+4,32413F-HRTimelineGroup
Arax Advisory Partners21,381$3M0.04%+21,04813F-HRTimeline
XPONANCE LLC21,324$2.99M0.02%-5513F-HRTimeline
BRITISH COLUMBIA INVESTMENT MANAGEMENT …21,058$2.95M0.02%-1,97613F-HRTimeline
Cetera Investment Advisers20,888$2.93M<0.01%+8,00013F-HRTimeline
BOKF, NAin group BOKF, NA20,280$2.84M0.04%-1,13113F-HRTimelineGroup
Sumitomo Mitsui DS Asset Management Com…in group SUMITOMO MITSUI FINANCIAL GRO…20,021$2.8M0.02%+1,91813F-HRTimelineGroup
UniSuper Management Pty Ltd20,001$2.8M0.02%+1,58813F-HRTimeline
INSPIRE TRUST CO, N.A.20,000$2.8M0.51%+2,00013F-HRTimeline
Vontobel Holding Ltd.in group Vontobel Holding Ltd.19,988$2.8M0.01%+6,54013F-HRTimelineGroup
GROUP ONE TRADING LLC19,310$2.7M0.08%-70,90813F-HRTimeline
Kintegral Advisory, LLCin group Kintegral Advisory, LLC19,254$2.7M0.23%-8613F-HRTimelineGroup
Morningstar Investment Management LLCin group Morningstar Investment Manage…18,779$2.63M0.1%new13F-HRTimelineGroup
Janney Montgomery Scott LLC18,703$2.62M0.01%-39613F-HRTimeline
Louisiana State Employees Retirement Sy…18,400$2.58M0.04%013F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson18,260$2.56M<0.01%013F-HRTimelineGroup
State of Alaska, Department of Revenue18,182$2.55M0.03%-87713F-HRTimeline
Focus Partners Wealthgroup of 2 filers holding17,304$2.54M+4,285Timeline
TRIGLAV INVESTMENTS, D.O.O.18,130$2.54M0.17%+10313F-HRTimeline
Leo Wealth, LLC18,112$2.54M0.33%-1113F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC18,017$2.52M<0.01%-10,53413F-HRTimeline
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC18,000$2.52M0.25%+12,90013F-HRTimelineGroup
HOURGLASS CAPITAL, LLC17,970$2.52M0.57%013F-HRTimeline
SummitTX Capital, L.P.17,379$2.43M0.1%-37,59113F-HRTimeline
Lombard Odier Asset Management (Switzer…17,264$2.42M0.11%+83413F-HRTimeline
iSAM Funds (UK) Ltdin group iSAM Funds (UK) Ltd17,191$2.41M0.49%+12,66613F-HRTimelineGroup
YOUSIF CAPITAL MANAGEMENT, LLC17,076$2.39M0.03%-2,67513F-HRTimeline
iA Global Asset Management Inc.16,978$2.38M0.03%+75413F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND16,741$2.35M0.03%+4,14313F-HRTimeline
CAPTRUST FINANCIAL ADVISORS16,532$2.32M<0.01%+1,93713F-HRTimeline
OP Asset Management Ltd16,246$2.28M0.03%013F-HR/ATimeline
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…15,929$2.23M0.02%-90613F-HRTimelineGroup
SYNOVUS FINANCIAL CORP15,595$2.18M0.02%-37013F-HRTimeline
CLARK ESTATES INC/NY15,300$2.14M0.49%013F-HRTimeline
Avanza Fonder AB15,287$2.14M0.06%013F-HRTimeline
Banque Cantonale Vaudoisein group Banque Cantonale Vaudoise15,145$2.12M0.08%-3,33513F-HRTimelineGroup
FULLER & THALER ASSET MANAGEMENT, INC.14,899$2.09M0.01%013F-HRTimeline
M&T Bank Corpin group M&T Bank Corp14,655$2.05M0.01%-84713F-HRTimelineGroup
STONERIDGE INVESTMENT PARTNERS LLC14,599$2.04M1.4%013F-HRTimeline
GABELLI FUNDS LLCin group GAMCO Investors (Gabelli)14,100$1.98M0.01%013F-HRTimelineGroup
BLAIR WILLIAM & CO/IL14,020$1.96M0.01%-82413F-HRTimeline
OPPENHEIMER & CO INCin group OPPENHEIMER ASSET MANAGEMENT …13,610$1.91M0.02%+11,34613F-HRTimelineGroup
EVOKE WEALTH, LLC13,372$1.87M0.04%+22513F-HRTimeline
Kentucky Retirement Systemsgroup of 2 filers holding13,015$1.82M-279Timeline
Pathstone Holdings, LLCin group Pathstone Holdings, LLC12,984$1.82M0.01%+1,38713F-HRTimelineGroup
BEACON INVESTMENT ADVISORY SERVICES, IN…12,930$1.81M0.08%013F-HRTimeline
Public Sector Pension Investment Board12,846$1.8M0.01%+1,59413F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.12,748$1.79M<0.01%+8,07513F-HRTimelineGroup
Norinchukin Bank, Thein group Norinchukin Bank, The12,628$1.77M0.02%+14313F-HRTimelineGroup
Provident Co of the Employees of the He…12,529$1.75M1.75%013F-HRTimeline
B. Metzler seel. Sohn & Co. AGin group B. Metzler seel. Sohn & Co. AG12,482$1.75M0.02%013F-HRTimelineGroup
RITHOLTZ WEALTH MANAGEMENT11,680$1.64M0.03%+5,60413F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…11,669$1.64M0.01%013F-HRTimeline
Pallas Capital Advisors LLC11,625$1.63M0.06%-74013F-HRTimeline
OSTRUM ASSET MANAGEMENT11,458$1.61M0.07%-3,06713F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…11,437$1.6M0.01%013F-HRTimeline
Wealthfront Advisers LLC11,324$1.59M<0.01%+2,64013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.11,593$1.58M<0.01%+2,85813F-HRTimelineGroup
K.J. Harrison & Partners Inc10,006$1.55M0.22%new13F-HRTimeline
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC10,978$1.54M<0.01%-13813F-HRTimelineGroup
NORTHWESTERN MUTUAL INVESTMENT MANAGEME…group of 2 filers holding10,603$1.49M+126Timeline
Federation des caisses Desjardins du Qu…10,575$1.48M0.01%+43113F-HRTimeline
Capula Management Ltdin group Capula Management Ltd10,208$1.43M0.01%new13F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
PITCAIRN COin group PITCAIRN CO10,192$1.43M0.11%+2,73813F-HRTimelineGroup
AUXIER ASSET MANAGEMENT LLC10,162$1.42M0.2%-7013F-HRTimeline
JACOBS LEVY EQUITY MANAGEMENT, INC10,124$1.42M0.01%-2,50113F-HRTimeline
HighTower Advisors, LLC10,116$1.42M<0.01%+1,24513F-HRTimeline
MIZUHO SECURITIES USA LLCin group MIZUHO FINANCIAL GROUP INC10,678$1.41M0.03%+54813F-HRTimelineGroup
Krensavage Asset Management, LLC10,000$1.4M0.6%new13F-HRTimeline
Generali Investments, Management Co LLC9,970$1.4M0.29%+8,00813F-HRTimeline
SG Americas Securities, LLC9,707$1.36M<0.01%-12,76313F-HRTimeline
Convergence Investment Partners, LLC9,583$1.34M0.3%new13F-HRTimeline
GREAT LAKES ADVISORS, LLC9,479$1.33M0.01%new13F-HRTimeline
SHELTON CAPITAL MANAGEMENT9,444$1.32M0.03%-7,92413F-HRTimeline
Investment Management Corp of Ontario9,387$1.31M0.02%+3,30913F-HRTimeline
NewEdge Advisors, LLC9,138$1.28M0.01%+6,46513F-HRTimeline
Sequoia Financial Advisors, LLC9,096$1.27M0.01%+4,56913F-HRTimeline
J. Safra Sarasin Holding AGin group J. Safra Sarasin Holding AG9,081$1.27M0.02%+6,70713F-HRTimelineGroup
Empowered Funds, LLC9,043$1.27M0.01%+70013F-HRTimeline
Premier Path Wealth Partners, LLC9,043$1.27M0.16%-50813F-HRTimeline
Sterling Capital Management LLC9,032$1.27M0.02%-69113F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…9,010$1.26M<0.01%+1,63313F-HRTimelineGroup
Shay Capital LLC9,000$1.26M0.23%new13F-HRTimeline
Harvest Fund Management Co., Ltdin group Harvest Fund Management Co., …8,998$1.26M0.05%+67913F-HRTimelineGroup
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP8,957$1.25M<0.01%+25413F-HRTimelineGroup
KENNEDY CAPITAL MANAGEMENT LLC8,837$1.24M0.03%+4,33413F-HRTimeline
WHITTIER TRUST CO OF NEVADA INC7,721$1.23M0.03%-2513F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP8,856$1.22M<0.01%+1,27713F-HRTimelineGroup
Dakota Wealth Management8,677$1.22M0.02%new13F-HR/ATimeline
HARTFORD INVESTMENT MANAGEMENT CO8,622$1.21M0.04%-16913F-HRTimeline
M&G PLCin group M&G PLC8,593$1.2M0.01%013F-HRTimelineGroup
QUADRANT CAPITAL GROUP LLC8,528$1.19M0.04%+35613F-HRTimeline
GROUPAMA ASSET MANAGMENT8,524$1.19M0.02%-39413F-HRTimeline
Krilogy Financial LLC7,707$1.18M0.04%new13F-HRTimeline
Missouri Trust & Investment Co8,425$1.18M0.35%+61513F-HRTimeline
Merit Financial Group, LLC8,367$1.17M0.01%+1,37613F-HR/ATimeline
CAPSTONE INVESTMENT ADVISORS, LLCin group CAPSTONE INVESTMENT ADVISORS,…8,271$1.16M0.01%+2,28513F-HRTimelineGroup
KEYBANK NATIONAL ASSOCIATION/OHin group KEYBANK NATIONAL ASSOCIATION/…8,254$1.16M<0.01%+16113F-HRTimelineGroup
THOR INVESTMENT MANAGEMENT INC /OH/ /ADV8,238$1.15M0.7%+99913F-HRTimeline
Cairn Investment Group, Inc.8,204$1.15M0.52%-7013F-HRTimeline
Jacobi Capital Management LLC8,125$1.14M0.07%+16213F-HRTimeline
CSM Advisors, LLC7,971$1.12M0.03%-19,48813F-HRTimeline
Gulf International Bank (UK) Ltd7,924$1.11M0.04%013F-HRTimeline
CSS LLC/IL7,750$1.09M0.06%+83013F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …7,022$1.08M<0.01%-25113F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC7,628$1.07M<0.01%-29,53313F-HRTimelineGroup
Linden Thomas Advisory Services, LLC7,593$1.06M0.11%+4213F-HRTimeline
Maryland State Retirement & Pension Sys…7,381$1.03M0.02%+57213F-HRTimeline
MML INVESTORS SERVICES, LLC7,286$1.02M<0.01%-1,27413F-HRTimeline
BROWN ADVISORY INCin group BROWN ADVISORY INC7,213$1.01M<0.01%-1813F-HRTimelineGroup
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.in group LANDSCAPE CAPITAL MANAGEMENT,…7,122$998K0.06%new13F-HRTimelineGroup
Canada Post Corp Registered Pension Plan7,193$996K0.04%013F-HRTimeline
CITIZENS & NORTHERN CORPin group CITIZENS & NORTHERN CORP6,996$980K0.24%-3213F-HRTimelineGroup
FOX RUN MANAGEMENT, L.L.C.6,969$976K0.15%-5,92213F-HRTimeline
SECURIAN ASSET MANAGEMENT, INC6,950$974K0.03%-64613F-HRTimeline
Assenagon Asset Management S.A.6,913$968K<0.01%-4,02313F-HRTimeline
EMERALD ADVISERS, LLCgroup of 2 filers holding6,870$962K+3,689Timeline
TWIN CAPITAL MANAGEMENT INC6,788$951K0.12%-5,24613F-HRTimeline
LORING WOLCOTT & COOLIDGE FIDUCIARY ADV…6,193$929K0.01%013F-HRTimeline
NEW MEXICO EDUCATIONAL RETIREMENT BOARD6,624$928K0.03%-20013F-HRTimeline
Ameritas Investment Partners, Inc.group of 2 filers holding6,579$922K-217Timeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …6,551$918K0.01%+96413F-HRTimelineGroup
BRIGHTON JONES LLC6,514$912K0.02%+1,41213F-HRTimeline
Koss-Olinger Consulting, LLC7,256$911K0.08%013F-HRTimeline
World Investment Advisors6,422$900K0.02%-5613F-HRTimeline
E. Ohman J:or Asset Management AB6,399$896K0.02%013F-HRTimeline
COMMERCE BANKin group COMMERCE BANK6,357$890K<0.01%+12113F-HRTimelineGroup
Jump Financial, LLCin group Jump Financial, LLC6,352$890K0.01%-1,81713F-HR/ATimelineGroup
denkapparat Operations GmbH6,338$888K0.57%+2,09813F-HRTimeline
Metis Global Partners, LLC6,324$886K0.02%-32313F-HRTimeline
Lido Advisors, LLCin group Lido Advisors, LLC6,299$882K<0.01%+1,15113F-HRTimelineGroup
MOGY JOEL R INVESTMENT COUNSEL INC6,260$877K0.05%013F-HRTimeline
GREENLEAF TRUST6,119$857K0.01%+45013F-HRTimeline
Advisors Asset Management, Inc.6,080$852K0.01%+36713F-HR/ATimeline
MONEY CONCEPTS CAPITAL CORP6,058$849K0.05%+2913F-HRTimeline
SUMMITRY LLC6,043$847K0.04%+3,39213F-HRTimeline
Daiichi Life Insurance Co., Ltd.in group Daiichi Life Insurance Co., L…6,019$843K0.02%013F-HRTimelineGroup
PKO Investment Management Joint-Stock Co6,000$840K0.07%-1,80013F-HRTimeline
Holocene Advisors, LP5,979$838K<0.01%new13F-HRTimeline
Ballentine Partners, LLC5,941$832K0.01%+46613F-HRTimeline
Summit Trail Advisors, LLC5,889$825K0.01%+3,20213F-HRTimeline
NICOLET BANKSHARES INCgroup of 2 filers holding5,595$818K-33Timeline
Gifford Fong Associates5,750$805K0.17%013F-HRTimeline
Hills Bank & Trust Coin group Hills Bank & Trust Co5,745$805K0.05%+15913F-HRTimelineGroup
BI Asset Management Fondsmaeglerselskab…in group BI Asset Management Fondsmaeg…5,688$797K0.01%-93813F-HRTimelineGroup
North Star Investment Management Corp.5,622$788K0.05%013F-HRTimeline
TOKIO MARINE ASSET MANAGEMENT CO LTDin group TOKIO MARINE HOLDINGS, INC.5,569$780K0.03%013F-HRTimelineGroup
Essential Partners LLC5,559$779K0.26%+21413F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC5,500$770K0.02%-5,42213F-HRTimeline
SHELL ASSET MANAGEMENT CO5,448$763K0.08%-2,99213F-HRTimeline
UNITED CAPITAL FINANCIAL ADVISORS, LLCin group UNITED CAPITAL FINANCIAL ADVI…5,433$761K0.01%+41113F-HRTimelineGroup
GUARDIAN INVESTMENT MANAGEMENT5,400$756K0.64%+10013F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC5,340$748K<0.01%-27,70113F-HRTimelineGroup
INCEPTIONR LLC5,302$743K0.18%-4,19813F-HRTimeline
Caprock Group, LLC5,611$742K0.02%13F-HRTimeline
Empirical Finance, LLC5,286$740K0.04%+5313F-HRTimeline