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Disclosery

BIIB BIOGEN INC

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Stock (common), issuer CIK 875045

1,014 managers (1,047 13F filers) reported a position in BIIB shares at 2026-06-30, 142,281,347 shares in all. 112 filers opened a position and 82 filers sold out during the quarter.

Managers
1,014
13F filers
1,047
New
112
Added
427
Reduced
297
Sold out
82
Shares held by filers
142,281,347

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, Q2 2026

Filers in the available 13F reports with a share position at 2026-06-30, 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, LLC33,877$7.32M0.16%-80713F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…33,770$7.3M0.03%-50913F-HRTimelineGroup
MERCER GLOBAL ADVISORS INC /ADV33,731$7.29M0.01%-4,86913F-HR/ATimeline
Korea Investment CORP33,574$7.25M0.01%-40,41413F-HRTimeline
CIBC Bancorp USA Inc.in group CIBC Bancorp USA Inc.33,539$7.25M0.01%-8,36313F-HRTimelineGroup
Insight Wealth Strategies, LLC34,320$7.2M0.7%+4,97413F-HRTimeline
Swiss Life Asset Management Ltdin group Swiss Life Asset Management L…33,311$7.2M0.03%+2,02313F-HRTimelineGroup
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…32,841$7.1M0.01%+12513F-HRTimelineGroup
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…32,609$7.05M0.03%-1,57713F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\32,597$7.04M0.01%+1,37413F-HRTimelineGroup
Focus Partners Wealthgroup of 2 filers holding32,378$7M+2,385Timeline
Federation des caisses Desjardins du Qu…31,948$6.9M0.02%+12,36713F-HRTimeline
OVERSEA-CHINESE BANKING Corp Ltdin group OVERSEA-CHINESE BANKING Corp …31,867$6.89M0.16%-5,59813F-HRTimelineGroup
LEUTHOLD GROUP, LLC31,489$6.8M0.68%-1,65413F-HRTimeline
DNB Asset Management ASin group DNB Asset Management AS31,221$6.75M0.02%013F-HRTimelineGroup
Retirement Systems of Alabama31,015$6.7M0.02%-15113F-HRTimeline
Verition Fund Management LLC30,914$6.68M0.05%new13F-HR/ATimeline
Rafferty Asset Management, LLC30,461$6.58M0.01%-4,55713F-HRTimeline
Daiwa Securities Group Inc.in group Daiwa Securities Group Inc.29,009$6.27M0.01%+1,87313F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP28,667$6.19M<0.01%+4,11313F-HRTimelineGroup
Baader Bank Aktiengesellschaft28,568$6.17M0.5%-2,23313F-HRTimeline
SYSTEMATIC FINANCIAL MANAGEMENT LP27,975$6.04M0.12%+11,75513F-HRTimeline
XPONANCE LLC27,821$6.01M0.04%+1,36513F-HRTimeline
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.27,463$5.93M0.05%+5,56113F-HRTimelineGroup
AMALGAMATED BANK25,842$5.58M0.04%-3,92013F-HRTimeline
Old North State Wealth Management, LLC24,720$5.34M2.28%+12513F-HRTimeline
Public Sector Pension Investment Board24,211$5.23M0.01%+41913F-HR/ATimeline
Rakuten Group, Inc.group of 2 filers holding24,112$5.22M+2,312Timeline
Mubadala Investment Co PJSC24,083$5.2M0.01%new13F-HRTimeline
Hillman Capital Management, Inc.23,993$5.18M3.75%-5,54713F-HRTimeline
Caprock Group, LLC23,824$5.15M0.1%-1,82713F-HRTimeline
NorthCrest Asset Manangement, LLC25,857$5.14M0.13%+84513F-HRTimeline
NEOS Investment Management LLC23,734$5.13M0.02%+2,89413F-HRTimeline
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC23,587$5.1M0.03%-2,79513F-HRTimelineGroup
China Universal Asset Management Co., L…23,497$5.08M0.3%-2,54713F-HRTimeline
OMERS ADMINISTRATION Corp23,421$5.06M0.03%+3,27213F-HRTimeline
Convergence Investment Partners, LLC23,321$5.04M0.48%+9,76413F-HRTimeline
Arax Advisory Partners23,147$5M0.03%+22,63213F-HRTimeline
CAPTRUST FINANCIAL ADVISORS22,885$4.94M0.01%+3,30813F-HRTimeline
SG Americas Securities, LLC22,800$4.93M<0.01%-172,86813F-HRTimeline
Utah Retirement Systems22,408$4.84M0.05%-1,30613F-HRTimeline
Police & Firemen's Retirement System of…22,103$4.78M0.04%-37413F-HRTimeline
BRITISH COLUMBIA INVESTMENT MANAGEMENT …22,021$4.76M0.03%+1,80413F-HRTimeline
New York Life Investment Management LLCin group New York Life Investment Mana…22,013$4.76M0.03%+10813F-HRTimelineGroup
Empowered Funds, LLC21,948$4.74M0.02%+17313F-HRTimeline
Leonteq Securities AG21,354$4.61M0.28%-5,10013F-HRTimeline
HUSSMAN STRATEGIC ADVISORS, INC.21,000$4.54M1.05%+14,70013F-HRTimeline
Caption Management, LLC21,000$4.54M0.16%new13F-HRTimeline
MEITAV INVESTMENT HOUSE LTDin group MEITAV INVESTMENT HOUSE LTD20,972$4.53M0.03%013F-HRTimelineGroup
Sumitomo Mitsui DS Asset Management Com…in group SUMITOMO MITSUI FINANCIAL GRO…20,916$4.52M0.03%+42713F-HRTimelineGroup
IMC-Chicago, LLC20,649$4.46M0.04%new13F-HRTimeline
NorthCoast Asset Management LLC20,457$4.42M0.1%-48313F-HRTimeline
Vontobel Holding Ltd.in group Vontobel Holding Ltd.20,311$4.39M0.01%+6,60113F-HRTimelineGroup
INSPIRE TRUST CO, N.A.20,000$4.32M0.59%013F-HRTimeline
Krensavage Asset Management, LLC20,000$4.32M1.64%013F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS19,995$4.32M0.01%-1,30413F-HRTimeline
Jupiter Topco LLCin group Janus Henderson19,831$4.28M<0.01%13F-HRTimelineGroup
MAI Capital Management19,431$4.2M0.02%+14,72913F-HRTimeline
Elo Mutual Pension Insurance Co19,287$4.17M0.05%+1,56013F-HRTimeline
MML INVESTORS SERVICES, LLC18,651$4.03M0.01%+7,31113F-HRTimeline
Artia Global Partners LP18,437$3.98M0.76%013F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND18,215$3.94M0.04%+1,37413F-HRTimeline
Kintegral Advisory, LLCin group Kintegral Advisory, LLC17,946$3.88M0.31%013F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC17,900$3.87M0.18%+6,90013F-HRTimelineGroup
Cetera Investment Advisers17,662$3.82M<0.01%-4,78213F-HRTimeline
MH & ASSOCIATES SECURITIES MANAGEMENT C…17,659$3.82M3.42%-5813F-HRTimeline
Ilmarinen Mutual Pension Insurance Co17,400$3.76M0.03%013F-HRTimeline
FULLER & THALER ASSET MANAGEMENT, INC.17,156$3.71M0.01%+1,91713F-HRTimeline
State of Alaska, Department of Revenue17,031$3.68M0.04%-47613F-HRTimeline
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …17,055$3.66M<0.01%+46913F-HRTimelineGroup
COMMONWEALTH EQUITY SERVICES, LLC16,759$3.62M<0.01%-1,34313F-HRTimeline
OP Asset Management Ltd16,758$3.62M0.04%+1,49513F-HRTimeline
UniSuper Management Pty Ltd16,729$3.61M0.02%+1,15713F-HRTimeline
Wealthfront Advisers LLC16,529$3.57M0.01%+85013F-HRTimeline
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…16,455$3.56M0.03%+79913F-HRTimelineGroup
BANK OF NOVA SCOTIAin group BANK OF NOVA SCOTIA16,446$3.55M0.01%-3,99013F-HRTimelineGroup
Morningstar Investment Management LLCin group Morningstar Investment Manage…19,344$3.55M0.22%013F-HRTimelineGroup
M&T Bank Corpin group M&T Bank Corp16,084$3.47M0.01%-14013F-HRTimelineGroup
STOREBRAND ASSET MANAGEMENT AS15,812$3.42M0.01%+11,58913F-HRTimeline
LBP AM SA15,741$3.4M0.03%+11,37413F-HRTimeline
Pathstone Holdings, LLCin group Pathstone Holdings, LLC15,469$3.36M0.01%+56113F-HRTimelineGroup
BLAIR WILLIAM & CO/IL15,539$3.36M0.01%+2,68513F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.15,360$3.32M<0.01%+11,14713F-HRTimelineGroup
CLARK ESTATES INC/NY15,300$3.31M0.76%013F-HRTimeline
FIDEURAM - INTESA SANPAOLO PRIVATE BANK…15,238$3.29M0.1%-73513F-HRTimeline
NewEdge Advisors, LLC15,037$3.25M0.01%+2,00613F-HRTimeline
PEAK6 LLCin group PEAK6 LLC14,752$3.19M0.08%-13,41413F-HRTimelineGroup
Horizon Investments, LLC14,307$3.09M0.03%+6313F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC14,134$3.05M0.03%-1,07213F-HRTimeline
GABELLI FUNDS LLCin group GAMCO Investors (Gabelli)14,100$3.05M0.02%013F-HRTimelineGroup
CANADA PENSION PLAN INVESTMENT BOARD13,602$2.94M<0.01%-101,33613F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.13,479$2.91M<0.01%+1,47413F-HRTimelineGroup
ALLSTATE CORPin group ALLSTATE CORP13,369$2.89M0.03%-4,18613F-HRTimelineGroup
Advisors Asset Management, Inc.13,312$2.88M0.04%+6,88113F-HRTimeline
Kentucky Retirement Systemsgroup of 2 filers holding13,049$2.82M-10,297Timeline
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC13,048$2.82M<0.01%+1,39713F-HRTimelineGroup
TRIGLAV INVESTMENTS, D.O.O.12,976$2.8M0.15%+54813F-HRTimeline
Pallas Capital Advisors LLC12,859$2.78M0.09%+89613F-HRTimeline
Sivik Global Healthcare LLC15,000$2.75M2.09%013F-HRTimeline
Merit Financial Group, LLC12,725$2.75M0.02%+1,29513F-HR/ATimeline
Fideuram Asset Management (Ireland) dac13,094$2.74M0.05%new13F-HRTimeline
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP12,621$2.73M<0.01%+1,05513F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP12,595$2.72M<0.01%-217,28413F-HRTimelineGroup
B. Metzler seel. Sohn & Co. AGin group B. Metzler seel. Sohn & Co. AG12,258$2.65M0.02%-17,46713F-HRTimelineGroup
BEACON INVESTMENT ADVISORY SERVICES, IN…12,229$2.64M0.1%-8513F-HRTimeline
NORTHWESTERN MUTUAL INVESTMENT MANAGEME…group of 2 filers holding12,033$2.6M+291Timeline
Avanza Fonder AB11,760$2.54M0.06%-2,86113F-HRTimeline
Turn8 Private Wealth Inc.12,068$2.53M1.69%new13F-HRTimeline
COMMERCE BANKin group COMMERCE BANK11,672$2.52M0.01%+4,59813F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…11,669$2.52M0.01%013F-HRTimeline
MIZUHO SECURITIES USA LLCin group MIZUHO FINANCIAL GROUP INC11,558$2.5M0.04%+2,68613F-HR/ATimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…11,437$2.47M0.02%013F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC11,435$2.47M<0.01%+96613F-HRTimelineGroup
Catalyst Funds Management Pty Ltd11,400$2.46M0.14%-57013F-HRTimeline
MACQUARIE GROUP LTDin group MACQUARIE GROUP LTD11,330$2.45M0.01%+2,81813F-HRTimelineGroup
Gulf International Bank (UK) Ltd11,183$2.42M0.05%-25713F-HRTimeline
PensionDanmark Pensionsforsikringsaktie…10,506$2.27M0.02%-48813F-HRTimeline
BI Asset Management Fondsmaeglerselskab…in group BI Asset Management Fondsmaeg…10,446$2.26M0.02%+2,56013F-HRTimelineGroup
CenterBook Partners LP10,418$2.25M0.11%new13F-HRTimeline
Orion Porfolio Solutions, LLC10,358$2.24M0.02%+1,86113F-HRTimeline
Saudi Central Bank10,273$2.22M0.03%+4,85813F-HRTimeline
Missouri Trust & Investment Co10,795$2.19M0.6%+41513F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC10,098$2.18M0.04%+29013F-HRTimeline
THOR INVESTMENT MANAGEMENT INC /OH/ /ADV10,002$2.16M1.23%+8113F-HRTimeline
Canal Insurance CO10,000$2.16M0.47%-10,00013F-HRTimeline
K.J. Harrison & Partners Inc10,000$2.16M0.31%013F-HRTimeline
Crossmark Global Holdings, Inc.9,980$2.16M0.03%+1913F-HRTimeline
Pinnacle Financial Partners, Inc.in group Pinnacle Financial Partners, …9,892$2.14M0.01%-3313F-HRTimelineGroup
GREAT LAKES ADVISORS, LLC9,477$2.05M0.02%-1313F-HRTimeline
Integrated Wealth Concepts LLC9,426$2.04M0.01%+1,81013F-HR/ATimeline
Sequoia Financial Advisors, LLC9,388$2.03M0.01%-56513F-HRTimeline
EMERALD ADVISERS, LLCgroup of 2 filers holding9,379$2.03M+235Timeline
Investment Management Corp of Ontario9,334$2.02M0.03%-1,20013F-HRTimeline
BROWN BROTHERS HARRIMAN & COin group BROWN BROTHERS HARRIMAN & CO9,312$2.01M0.01%+3,01913F-HRTimelineGroup
Norinchukin Bank, Thein group Norinchukin Bank, The9,240$2M0.02%+2013F-HRTimelineGroup
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…9,230$1.99M<0.01%+1013F-HRTimeline
Birchview Capital, LP9,000$1.94M0.91%+4,00013F-HRTimeline
SIMPLEX TRADING, LLC8,983$1.94M0.05%+6,81913F-HRTimeline
BOKF, NAin group BOKF, NA8,918$1.93M0.03%-80113F-HRTimelineGroup
GLENMEDE TRUST CO NAin group GLENMEDE TRUST CO NA8,786$1.9M0.01%-2,86613F-HRTimelineGroup
AUXIER ASSET MANAGEMENT LLC8,684$1.88M0.25%-18513F-HRTimeline
BRIGHTON JONES LLC8,636$1.87M0.03%+58513F-HRTimeline
Sompo Asset Management Co., Ltd.8,596$1.86M0.3%-18013F-HRTimeline
M&G PLCin group M&G PLC8,593$1.86M0.01%013F-HRTimelineGroup
CI INVESTMENTS INC.in group CI INVESTMENTS INC.8,582$1.85M0.01%+4,50413F-HRTimelineGroup
PROFUND ADVISORS LLC8,560$1.85M0.05%-3,40113F-HRTimeline
QUADRANT CAPITAL GROUP LLC8,289$1.79M0.05%+12113F-HRTimeline
HARTFORD INVESTMENT MANAGEMENT CO8,140$1.76M0.05%-26113F-HRTimeline
Cambridge Investment Research Advisors,…8,104$1.75M<0.01%+4,99113F-HR/ATimeline
Janney Montgomery Scott LLC8,100$1.75M<0.01%new13F-HRTimeline
Cairn Investment Group, Inc.8,043$1.74M0.77%013F-HRTimeline
ABN AMRO INVESTMENT SOLUTIONSin group ABN AMRO INVESTMENT SOLUTIONS8,037$1.74M0.02%+2,06113F-HRTimelineGroup
Allworth Financial LP8,033$1.74M0.01%+3,82213F-HRTimeline
Maryland State Retirement & Pension Sys…7,843$1.69M0.03%+74813F-HRTimeline
AG2R LA MONDIALE GESTION D'ACTIFS7,838$1.69M0.06%-53713F-HRTimeline
Krilogy Financial LLC7,783$1.68M0.05%+19313F-HRTimeline
KEYBANK NATIONAL ASSOCIATION/OHin group KEYBANK NATIONAL ASSOCIATION/…7,775$1.68M0.01%-1,05913F-HRTimelineGroup
Louisiana State Employees Retirement Sy…7,500$1.62M0.02%013F-HR/ATimeline
Lighthouse Investment Partners, LLCin group Lighthouse Investment Partner…7,500$1.62M0.05%-25,13213F-HRTimelineGroup
Jacobi Capital Management LLC7,462$1.61M0.08%-18713F-HRTimeline
Generali Investments, Management Co LLC7,437$1.61M0.35%+32513F-HRTimeline
CIBC WORLD MARKET INC.7,424$1.6M<0.01%new13F-HRTimeline
HAGER INVESTMENT MANAGEMENT SERVICES, L…7,381$1.59M0.73%new13F-HRTimeline
WHITTIER TRUST CO OF NEVADA INC7,668$1.58M0.03%-5513F-HRTimeline
Kathmere Capital Management, LLC7,285$1.57M0.08%+64213F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …7,471$1.57M<0.01%+14913F-HRTimelineGroup
PARK AVENUE SECURITIES LLCin group PARK AVENUE SECURITIES LLC7,248$1.57M0.01%new13F-HRTimelineGroup
NEW MEXICO EDUCATIONAL RETIREMENT BOARD7,224$1.56M0.04%+40013F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP7,105$1.54M<0.01%-2,33913F-HRTimelineGroup
Summit Trail Advisors, LLC7,082$1.53M0.02%+19613F-HRTimeline
UNITED CAPITAL FINANCIAL ADVISORS, LLCin group UNITED CAPITAL FINANCIAL ADVI…7,017$1.52M0.01%+23113F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC7,005$1.51M<0.01%-29,04813F-HRTimelineGroup
Canada Post Corp Registered Pension Plan6,973$1.51M0.05%013F-HRTimeline
Kennondale Capital Management LLC6,967$1.51M1%013F-HRTimeline
GF FUND MANAGEMENT CO. LTD.6,957$1.5M0.02%-33613F-HRTimeline
CITIZENS & NORTHERN CORPin group CITIZENS & NORTHERN CORP6,943$1.5M0.34%-19413F-HRTimelineGroup
Laird Norton Wetherby Trust Company, LLCin group Laird Norton Wetherby Trust C…6,920$1.5M0.03%+2113F-HRTimelineGroup
STABLEFORD CAPITAL II LLC6,912$1.49M0.52%+813F-HRTimeline
Plato Investment Management Ltd6,938$1.49M0.09%+1,99913F-HRTimeline
Ascent Group, LLCin group Ascent Group, LLC6,852$1.48M0.04%+1613F-HRTimelineGroup
Arrowpoint Investment Partners (Singapo…in group Arrowpoint Investment Partner…6,838$1.48M0.43%+2,13213F-HRTimelineGroup
SIG BROKERAGE, LP6,824$1.47M0.24%+1,32413F-HRTimeline
BANK OF HAWAII6,780$1.46M0.07%-5913F-HRTimeline
Vise Technologies, Inc.6,627$1.43M0.02%+1,21213F-HRTimeline
GREENLEAF TRUST6,491$1.4M0.01%+12013F-HRTimeline
Sagewood Asset Management LP6,484$1.4M0.32%-913F-HRTimeline
GAMMA Investing LLC6,462$1.4M0.05%+46913F-HRTimeline
TOKIO MARINE ASSET MANAGEMENT CO LTDin group TOKIO MARINE HOLDINGS, INC.6,428$1.39M0.04%013F-HRTimelineGroup
Ballentine Partners, LLC6,407$1.38M0.02%+5713F-HRTimeline
NICOLET BANKSHARES INCin group NICOLET BANKSHARES INC6,476$1.37M0.04%-4013F-HRTimelineGroup
denkapparat Operations GmbH6,338$1.37M0.45%013F-HRTimeline
Econ Financial Services Corp6,300$1.36M0.64%+1,90313F-HRTimeline
MOGY JOEL R INVESTMENT COUNSEL INC6,260$1.35M0.08%013F-HRTimeline
LORING WOLCOTT & COOLIDGE FIDUCIARY ADV…6,193$1.34M0.01%013F-HRTimeline
Sigma Planning Corp6,193$1.34M0.03%-1,00813F-HRTimeline
Metis Global Partners, LLC6,191$1.34M0.03%+1513F-HRTimeline
Callan Family Office, LLCin group Callan Family Office, LLC6,183$1.34M0.03%-31613F-HRTimelineGroup
HB Wealth Management, LLC6,176$1.33M0.01%+49513F-HRTimeline
Kestra Advisory Services, LLCin group Kestra Advisory Services, LLC6,154$1.33M<0.01%+34413F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…6,128$1.32M<0.01%-63313F-HRTimelineGroup