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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
UNITED CAPITAL FINANCIAL ADVISORS, LLCin group UNITED CAPITAL FINANCIAL ADVI…6,255$1.1M0.01%+82213F-HRTimelineGroup
Advisors Asset Management, Inc.6,212$1.09M0.02%+13213F-HR/ATimeline
Assenagon Asset Management S.A.6,200$1.09M<0.01%-71313F-HRTimeline
LORING WOLCOTT & COOLIDGE FIDUCIARY ADV…6,193$1.08M0.01%013F-HRTimeline
Private Advisor Group, LLC6,113$1.08M0.01%+1,64613F-HRTimeline
CSS LLC/IL6,080$1.07M0.06%-1,67013F-HRTimeline
Ascent Group, LLCin group Ascent Group, LLC6,034$1.06M0.04%+2,08613F-HRTimelineGroup
Daiichi Life Insurance Co., Ltd.in group Daiichi Life Insurance Co., L…6,019$1.06M0.03%013F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
Knott David M Jr6,000$1.06M0.49%+4,00013F-HRTimeline
Independent Advisor Alliance5,987$1.05M0.03%+3,81613F-HRTimeline
Sagewood Asset Management LP5,899$1.04M0.37%13F-HRTimeline
Forum Financial Management, LPin group Forum Financial Management, LP5,887$1.04M0.01%+3,03913F-HRTimelineGroup
INDEPENDENT FINANCIAL GROUP, LLC5,814$1.02M0.02%+4,38613F-HRTimeline
Lighthouse Investment Partners, LLCin group Lighthouse Investment Partner…5,788$1.02M0.03%-22,21213F-HRTimelineGroup
Jump Financial, LLCin group Jump Financial, LLC5,779$1.02M0.01%-57313F-HRTimelineGroup
Gifford Fong Associates5,750$1.01M0.2%013F-HRTimeline
Premier Path Wealth Partners, LLC5,730$1.01M0.13%-3,31313F-HRTimeline
Brooklyn Investment Group5,702$1.01M0.05%+1,44613F-HRTimeline
E. Ohman J:or Asset Management AB5,719$1.01M0.02%-68013F-HRTimeline
Essential Partners LLC5,714$1.01M0.31%+15513F-HRTimeline
North Star Investment Management Corp.5,642$993K0.06%+2013F-HRTimeline
TOKIO MARINE ASSET MANAGEMENT CO LTDin group TOKIO MARINE HOLDINGS, INC.5,569$980K0.03%013F-HRTimelineGroup
BI Asset Management Fondsmaeglerselskab…in group BI Asset Management Fondsmaeg…5,571$980K0.01%-11713F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC5,542$975K0.01%+1,26913F-HRTimeline
GAMMA Investing LLC5,516$971K0.05%+1,17313F-HRTimeline
CSM Advisors, LLC5,481$964K0.03%-2,49013F-HRTimeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …5,469$962K0.01%-1,08213F-HRTimelineGroup
TWO SIGMA SECURITIES, LLC5,430$956K0.13%new13F-HRTimeline
Vise Technologies, Inc.5,415$953K0.02%+2,61613F-HRTimeline
Summit Trail Advisors, LLC5,401$951K0.02%-48813F-HRTimeline
GUARDIAN INVESTMENT MANAGEMENT5,400$950K0.74%013F-HRTimeline
Wealthcare Advisory Partners LLCin group Wealthcare Advisory Partners …5,302$933K0.02%new13F-HRTimelineGroup
Sigma Planning Corp5,246$923K0.03%new13F-HRTimeline
Annis Gardner Whiting Capital Advisors,…5,190$913K0.17%+1213F-HRTimeline
Frank, Rimerman Advisors LLC5,182$912K0.06%+113F-HRTimeline
Sanctuary Advisors, LLC5,172$910K<0.01%+1,37513F-HRTimeline
Ellevest, Inc.5,167$909K0.13%+27213F-HRTimeline
Elevated Private Wealth, LLC5,163$909K0.95%13F-HRTimeline
Cannell & Spears LLC5,079$894K0.02%013F-HRTimeline
Unison Advisors LLC5,078$894K0.08%013F-HRTimeline
Empirical Finance, LLC5,076$893K0.04%-21013F-HRTimeline
Laurion Capital Management LP5,033$886K0.06%new13F-HR/ATimeline
Polymer Capital Management (US) LLC5,022$884K0.11%+2,34813F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…5,007$881K<0.01%-16813F-HR/ATimelineGroup
BROWN BROTHERS HARRIMAN & COin group BROWN BROTHERS HARRIMAN & CO4,984$877K<0.01%+28813F-HRTimelineGroup
Plato Investment Management Ltd4,939$873K0.06%013F-HRTimeline
Lido Advisors, LLCin group Lido Advisors, LLC5,991$865K<0.01%-30813F-HRTimelineGroup
Meeder Advisory Services, Inc.group of 2 filers holding4,880$859K+455Timeline
INCEPTIONR LLC4,876$858K0.24%-42613F-HRTimeline
ABN AMRO INVESTMENT SOLUTIONSin group ABN AMRO INVESTMENT SOLUTIONS4,826$849K0.01%new13F-HRTimelineGroup
SUMMITRY LLC4,794$844K0.04%-1,24913F-HRTimeline
Kathmere Capital Management, LLC4,791$843K0.06%+2,31813F-HRTimeline
COLDSTREAM CAPITAL MANAGEMENT INC4,782$842K0.01%+30213F-HRTimeline
&PARTNERS4,285$833K<0.01%+75513F-HRTimeline
HB Wealth Management, LLC4,670$822K0.01%+58113F-HRTimeline
Hills Bank & Trust Coin group Hills Bank & Trust Co4,619$813K0.05%-1,12613F-HRTimelineGroup
Arkadios Wealth Advisors4,575$805K0.02%+1,67913F-HRTimeline
Kestra Advisory Services, LLCin group Kestra Advisory Services, LLC4,509$794K<0.01%+2,38713F-HRTimelineGroup
Jones Kertz & Associates, Inc.4,491$790K0.41%13F-HRTimeline
Davis Investment Partners, LLC4,374$778K0.27%+7113F-HRTimeline
First County Bank /CT/4,412$776K0.41%-6513F-HRTimeline
CI INVESTMENTS INC.in group CI INVESTMENTS INC.4,397$774K<0.01%-28513F-HRTimelineGroup
Concurrent Investment Advisors, LLCin group Concurrent Investment Advisor…4,376$770K0.01%+2,80413F-HRTimelineGroup
SIGNATUREFD, LLC4,370$769K0.01%+2813F-HRTimeline
Lineweaver Wealth Advisors, LLC4,338$763K0.1%+2,12913F-HRTimeline
Parallel Advisors, LLC4,302$757K0.01%+7913F-HRTimeline
Savvy Advisors, Inc.4,249$748K0.02%+81113F-HRTimeline
Vident Advisory, LLCin group Vident Advisory, LLC4,205$740K0.01%-79213F-HRTimelineGroup
PINNACLE ASSOCIATES LTD4,155$731K0.01%+713F-HRTimeline
V-Square Quantitative Management LLC4,120$725K0.08%new13F-HRTimeline
STOREBRAND ASSET MANAGEMENT AS4,048$712K<0.01%+1,71313F-HRTimeline
Cohen Klingenstein LLC4,000$704K0.02%013F-HRTimeline
Texas Yale Capital Corp.3,987$702K0.02%013F-HRTimeline
Econ Financial Services Corp3,946$694K0.35%new13F-HRTimeline
SECURIAN ASSET MANAGEMENT, INC3,945$694K0.03%-3,00513F-HRTimeline
FARMERS & MERCHANTS INVESTMENTS INCin group FARMERS & MERCHANTS INVESTMEN…3,941$694K0.02%-113F-HRTimelineGroup
Lifeworks Advisors, LLC3,933$692K0.09%-74813F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…3,923$690K0.19%+56413F-HRTimelineGroup
Burns Matteson Capital Management, LLC3,919$690K0.28%new13F-HRTimeline
Wahed Invest LLC3,846$677K0.09%-15013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…3,831$674K0.02%+35613F-HRTimelineGroup
QRG CAPITAL MANAGEMENT, INC.3,795$668K0.01%+22413F-HRTimeline
Ironwood Financial, llc3,535$656K0.11%-813F-HRTimeline
AlphaCentric Advisors LLC3,627$638K0.64%13F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC3,568$628K<0.01%+15413F-HRTimelineGroup
Bellevue Group AGin group Bellevue Group AG3,565$627K0.01%-64813F-HRTimelineGroup
CHESAPEAKE CAPITAL CORP /IL/3,544$624K0.52%new13F-HRTimeline
Avestar Capital, LLC3,535$622K0.04%+91313F-HRTimeline
Siemens Fonds Invest GmbH3,521$621K0.03%013F-HRTimeline
Pavaki Capital Management LLC3,500$616K0.43%13F-HR/ATimeline
STRS OHIO3,499$616K<0.01%+613F-HRTimeline
Allworth Financial LP3,486$613K<0.01%+64613F-HRTimeline
Banque Cantonale Vaudoisein group Banque Cantonale Vaudoise3,462$609K0.02%-11,68313F-HRTimelineGroup
PRAXIS INVESTMENT MANAGEMENT INC3,450$607K0.04%013F-HRTimeline
MAI Capital Management3,447$607K<0.01%+2,75713F-HRTimeline
Beacon Pointe Advisors, LLC3,401$598K<0.01%+17713F-HRTimeline
SAX WEALTH ADVISORS, LLC3,330$586K0.03%+2713F-HRTimeline
Compound Planning, Inc.3,278$577K0.02%new13F-HRTimeline
CoreCap Advisors, LLC3,276$577K0.02%+3,07713F-HRTimeline
Vestcor Inc3,246$571K0.02%013F-HRTimeline
Prime Capital Investment Advisors, LLC3,226$568K0.01%-52513F-HRTimeline
South Dakota Investment Council3,213$565K0.01%-20013F-HRTimeline
PANAGORA ASSET MANAGEMENT INC3,203$564K<0.01%-2813F-HRTimeline
Atria Investments, Inc3,203$564K0.01%+1,41413F-HRTimeline
RDA Financial Network3,200$563K0.14%013F-HRTimeline
IKE Capital, LLC3,194$562K0.49%13F-HRTimeline
EVOLVE PRIVATE WEALTH, LLC3,183$560K0.03%13F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC3,178$559K<0.01%+3513F-HRTimelineGroup
SYON CAPITAL LLC3,146$554K0.03%+37613F-HRTimeline
Phoenix Financial Ltd.in group Phoenix Financial Ltd.3,133$551K0.01%new13F-HRTimelineGroup
ROBERTS GLORE & CO INC /IL/3,081$542K0.14%-84813F-HRTimeline
PARK AVENUE SECURITIES LLCin group PARK AVENUE SECURITIES LLC3,030$533K<0.01%-41713F-HRTimelineGroup
OPPENHEIMER ASSET MANAGEMENT INC.group of 2 filers holding3,012$530K-10,598Timeline
Massachusetts Wealth Management2,999$528K0.25%+12513F-HRTimeline
HORIZON KINETICS ASSET MANAGEMENT LLC2,988$526K0.01%-13113F-HRTimeline
Bank Pictet & Cie (Europe) AG2,969$523K0.01%+10313F-HRTimeline
Wedmont Private Capital2,793$522K0.02%+11313F-HRTimeline
Aquatic Capital Management LLC2,909$512K0.01%new13F-HRTimeline
HUNTER ASSOCIATES INVESTMENT MANAGEMENT…2,886$509K0.07%013F-HRTimeline
Persistent Asset Partners Ltd2,874$506K0.24%new13F-HRTimeline
TOWER TRUST & INVESTMENT Co2,857$503K0.32%-4313F-HRTimeline
Arrowpoint Investment Partners (Singapo…in group Arrowpoint Investment Partner…2,855$502K0.07%new13F-HRTimelineGroup
CIM INVESTMENT MANAGEMENT INC2,844$501K0.13%013F-HRTimeline
ATLAS CAPITAL ADVISORS INC.2,844$501K0.06%13F-HRTimeline
TWINBEECH CAPITAL LP2,834$499K0.04%new13F-HRTimeline
KCM INVESTMENT ADVISORS LLC2,799$493K0.02%013F-HRTimeline
AlphaQuest LLC2,799$493K0.03%+2,42413F-HRTimeline
Waverly Advisors, LLC2,793$492K<0.01%new13F-HRTimeline
Uncommon Cents Investing LLC2,779$489K0.12%+3013F-HRTimeline
Kennondale Capital Management LLC2,760$486K0.36%013F-HRTimeline
Chicago Partners Investment Group LLC2,816$483K0.01%+9213F-HRTimeline
KLINGENSTEIN FIELDS & CO LP2,731$481K0.02%013F-HRTimeline
Integrated Wealth Concepts LLC2,726$480K0.01%-1,66113F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC2,711$478K<0.01%-6113F-HRTimelineGroup
Waterfront Wealth Inc.2,769$474K0.09%+3813F-HRTimeline
Caerus Investment Advisors, LLC2,667$469K0.16%+18713F-HRTimeline
EFG International AGin group EFG International AG2,635$464K0.01%13F-HRTimelineGroup
Tema ETFs LLC2,620$461K0.04%-413F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd2,611$460K<0.01%new13F-HRTimelineGroup
EAGLE GLOBAL ADVISORS LLC2,600$458K0.02%-2513F-HRTimeline
EVERGREEN CAPITAL MANAGEMENT LLC2,588$455K0.01%+27113F-HRTimeline
PITCAIRN COgroup of 2 filers holding2,565$451K-7,627Timeline
AlphaCore Capital LLC2,554$450K0.01%+2513F-HRTimeline
Motley Fool Asset Management LLCin group Motley Fool Asset Management …2,541$447K0.02%+15313F-HRTimelineGroup
Westside Investment Management, Inc.2,512$444K0.07%+3213F-HRTimeline
XXI WEALTH, LLC2,515$443K0.27%13F-HRTimeline
PRUDENTIAL PLCin group PRUDENTIAL PLC2,508$441K<0.01%013F-HRTimelineGroup
TRUST CO OF TOLEDO NA /OH/2,507$441K0.04%+46813F-HRTimeline
Andra AP-fonden2,500$440K0.01%new13F-HRTimeline
DKRT Investments Corp.2,500$440K0.12%013F-HRTimeline
OSTRUM ASSET MANAGEMENT2,476$436K0.02%-8,98213F-HRTimeline
IHT Wealth Management, LLC2,473$435K0.01%new13F-HRTimeline
NewEdge Wealth, LLC2,470$435K<0.01%new13F-HRTimeline
F/m Investments LLC2,465$434K0.02%new13F-HRTimeline
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.in group LANDSCAPE CAPITAL MANAGEMENT,…2,459$433K0.03%-4,66313F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd2,459$433K0.01%new13F-HRTimelineGroup
TFB Advisors LLC2,448$431K0.12%013F-HRTimeline
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK2,447$431K<0.01%+16213F-HRTimelineGroup
CAPSTONE INVESTMENT ADVISORS, LLCin group CAPSTONE INVESTMENT ADVISORS,…2,445$430K<0.01%-5,82613F-HRTimelineGroup
Richwood Investment Advisors, LLC2,122$427K0.31%-12513F-HRTimeline
Aljian Capital Management, LLC2,415$425K0.08%013F-HRTimeline
ORACLE INVESTMENT MANAGEMENT INC2,412$424K0.28%013F-HRTimeline
McAdam, LLC2,410$424K0.02%new13F-HRTimeline
PERSONAL CFO SOLUTIONS, LLC2,403$423K0.07%-3513F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…2,398$422K0.02%+15113F-HRTimelineGroup
ASSETMARK, INCin group ASSETMARK, INC2,392$421K<0.01%+32113F-HRTimelineGroup
CHOREO, LLC2,377$419K0.01%-6713F-HRTimeline
PDT Partners, LLC2,348$413K0.03%013F-HRTimeline
Philip James Wealth Mangement, LLC2,328$410K0.05%+18213F-HRTimeline
Sivia Capital Partners, LLC2,315$407K0.08%+1713F-HRTimeline
Fayez Sarofim & Coin group Fayez Sarofim & Co2,300$405K<0.01%013F-HRTimelineGroup
Supplemental Annuity Collective Trust o…2,300$405K0.1%013F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.2,294$404K0.03%-413F-HRTimeline
AXXCESS WEALTH MANAGEMENT, LLC2,281$401K0.01%new13F-HR/ATimeline
AIA Group Ltdin group AIA Group Ltd2,275$400K0.01%-19,88613F-HRTimelineGroup
Colonial River Investments, LLC2,273$400K0.14%new13F-HRTimeline
BEESE FULMER INVESTMENT MANAGEMENT, INC.2,272$400K0.03%new13F-HRTimeline
MGO ONE SEVEN LLC2,251$396K0.01%new13F-HRTimeline
Clearstead Advisors, LLC2,249$396K<0.01%+74713F-HRTimeline
Prospera Financial Services Inc2,240$394K0.01%new13F-HRTimeline
Parallax Volatility Advisers, L.P.2,237$394K0.01%new13F-HRTimeline
TCW GROUP INCin group TCW GROUP INC2,226$392K<0.01%new13F-HRTimelineGroup
Empirical Financial Services, LLC d.b.a…2,218$390K0.01%+75313F-HRTimeline
Crestwood Advisors Group, LLC2,194$386K0.01%+37313F-HRTimeline
DGS Capital Management, LLCin group DGS Capital Management, LLC2,182$384K0.07%+47413F-HRTimelineGroup
WESTPAC BANKING CORPin group WESTPAC BANKING CORP2,178$383K0.02%+34013F-HRTimelineGroup
NAVELLIER & ASSOCIATES INC2,164$381K0.04%013F-HRTimeline
SECTORAL ASSET MANAGEMENT INC2,155$379K0.3%-22013F-HRTimeline
Frec Markets, Inc.in group Frec Markets, Inc.2,154$379K0.11%13F-HRTimelineGroup
Evercore Wealth Management, LLC2,142$377K0.01%013F-HRTimeline
PROATHLETE WEALTH MANAGEMENT LLC2,108$371K0.1%+4013F-HRTimeline
Integrated Advisors Network LLC2,104$370K0.02%-50913F-HRTimeline
Parcion Private Wealth LLC2,096$369K0.02%+47713F-HRTimeline
Ausdal Financial Partners, Inc.2,088$367K0.02%new13F-HRTimeline
Blackhawk Capital Partners, LLC2,087$367K0.14%-1,23813F-HRTimeline
EXCHANGE TRADED CONCEPTS, LLC2,084$367K<0.01%-36713F-HRTimeline
Wealthspire Advisors, LLC2,051$361K<0.01%+98413F-HRTimeline
Sage Mountain Advisors LLC2,042$359K0.02%-34813F-HRTimeline
Capital Investment Advisors, LLC2,001$352K0.01%-14413F-HRTimeline
Estabrook Capital Management2,000$352K0.05%013F-HRTimeline