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Disclosery

BIIB BIOGEN INC

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Stock (common), issuer CIK 875045

851 managers (868 13F filers) reported a position in BIIB shares at 2025-06-30, 130,117,541 shares in all. 81 filers opened a position and 101 filers sold out during the quarter.

Managers
851
13F filers
868
New
81
Added
343
Reduced
265
Sold out
101
Shares held by filers
130,117,541

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 2025

Filers in the available 13F reports with a share position at 2025-06-30, 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
OMERS ADMINISTRATION Corp5,180$651K0.01%013F-HRTimeline
Lido Advisors, LLCin group Lido Advisors, LLC5,148$647K<0.01%-37,89713F-HRTimelineGroup
BROWN BROTHERS HARRIMAN & COin group BROWN BROTHERS HARRIMAN & CO5,123$643K<0.01%+65913F-HRTimelineGroup
BRIGHTON JONES LLC5,102$641K0.02%new13F-HRTimeline
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC5,100$641K0.1%+60013F-HRTimelineGroup
Vident Advisory, LLCin group Vident Advisory, LLC5,064$636K0.01%-1,76613F-HRTimelineGroup
Cannell & Spears LLC5,060$635K0.01%+413F-HRTimeline
UNITED CAPITAL FINANCIAL ADVISORS, LLCin group UNITED CAPITAL FINANCIAL ADVI…5,022$631K0.01%+1,64413F-HRTimelineGroup
CI INVESTMENTS INC.in group CI INVESTMENTS INC.4,971$624K<0.01%-1,64113F-HRTimelineGroup
Plato Investment Management Ltd4,939$618K0.05%+3,86913F-HRTimeline
CROWLEY WEALTH MANAGEMENT, INC.4,910$617K0.56%-38513F-HRTimeline
Annis Gardner Whiting Capital Advisors,…4,809$604K0.21%+39613F-HRTimeline
Lifeworks Advisors, LLC4,697$590K0.09%+24413F-HRTimeline
V-Square Quantitative Management LLC4,679$588K0.08%+47013F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.4,673$587K<0.01%-5,01013F-HRTimelineGroup
SYSTEMATIC FINANCIAL MANAGEMENT LP4,670$587K0.02%013F-HRTimeline
EP Wealth Advisors, LLC4,614$579K<0.01%+23013F-HRTimeline
SIGNATUREFD, LLC4,571$574K0.01%+1,87413F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC4,531$569K0.01%-2,97313F-HRTimeline
Sequoia Financial Advisors, LLC4,527$568K<0.01%+1,51013F-HRTimeline
iSAM Funds (UK) Ltdin group iSAM Funds (UK) Ltd4,525$568K0.12%new13F-HRTimelineGroup
PINNACLE ASSOCIATES LTD4,519$568K0.01%+10213F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC4,503$566K0.01%+5213F-HRTimeline
First County Bank /CT/4,477$562K0.3%-29513F-HRTimeline
Howard Capital Management, LLC4,442$558K0.01%+45013F-HRTimeline
Parallel Advisors, LLC4,354$547K0.01%+2,74413F-HRTimeline
ROBERTS GLORE & CO INC /IL/4,344$546K0.16%+18113F-HRTimeline
111 Capital4,267$536K0.09%-1,35313F-HRTimeline
Meeder Advisory Services, Inc.group of 2 filers holding4,259$535K+2,611Timeline
Brooklyn Investment Group4,254$534K0.07%+3,32513F-HR/ATimeline
Court Place Advisors, LLC4,240$533K0.17%-13013F-HRTimeline
denkapparat Operations GmbH4,240$533K0.43%+1,00013F-HRTimeline
Private Advisor Group, LLC4,238$532K<0.01%-31813F-HRTimeline
Laird Norton Wetherby Wealth Management…4,184$525K0.02%13F-HRTimeline
ARGA Investment Management, LP4,133$519K0.01%013F-HRTimeline
CW Advisors, LLC4,106$516K<0.01%+1,07313F-HRTimeline
Prime Capital Investment Advisors, LLC4,055$509K0.01%+1,41913F-HRTimeline
Cohen Klingenstein LLC4,000$502K0.02%013F-HRTimeline
Texas Yale Capital Corp.3,987$501K0.02%013F-HRTimeline
QRG CAPITAL MANAGEMENT, INC.3,982$500K<0.01%-5713F-HRTimeline
Wahed Invest LLC3,972$499K0.08%+19813F-HRTimeline
Walleye Capital LLCgroup of 2 filers holding3,955$497K-77,141Timeline
FARMERS & MERCHANTS INVESTMENTS INCin group FARMERS & MERCHANTS INVESTMEN…3,947$496K0.01%-2013F-HRTimelineGroup
Crossmark Global Holdings, Inc.3,940$495K0.01%+33813F-HRTimeline
Ironwood Financial, llc3,535$484K0.1%013F-HRTimeline
MQS Management LLC3,817$479K0.26%+2,03013F-HRTimeline
Polymer Capital Management (US) LLC3,760$472K0.08%-12013F-HRTimeline
Applied Finance Capital Management, LLC3,703$465K0.03%new13F-HRTimeline
Integrated Wealth Concepts LLC3,689$463K<0.01%+1,60913F-HRTimeline
WESTPAC BANKING CORPin group WESTPAC BANKING CORP3,635$457K0.03%013F-HRTimelineGroup
South Dakota Investment Council3,613$454K0.01%013F-HRTimeline
GAMMA Investing LLC3,587$450K0.03%+1,72513F-HRTimeline
Siemens Fonds Invest GmbH3,540$445K0.03%+33213F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC3,544$444K<0.01%+50713F-HRTimelineGroup
STRS OHIO3,492$439K<0.01%-30,50813F-HRTimeline
Cambridge Investment Research Advisors,…3,432$431K<0.01%-39613F-HRTimeline
Simplicity Wealth,LLC3,424$430K0.02%new13F-HRTimeline
SIG BROKERAGE, LP3,379$424K0.12%-84613F-HRTimeline
State of Wyoming3,379$424K0.05%+81813F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…3,359$422K0.14%+1,04813F-HRTimelineGroup
SAX WEALTH ADVISORS, LLC3,288$413K0.02%+1,07813F-HRTimeline
Vestcor Inc3,246$408K0.01%+70313F-HRTimeline
MUFG SECURITIES AMERICAS INC.3,247$408K0.03%+65613F-HRTimeline
COLDSTREAM CAPITAL MANAGEMENT INC3,246$408K0.01%-11613F-HRTimeline
Blackhawk Capital Partners, LLC3,212$403K0.19%+42313F-HRTimeline
PARK AVENUE SECURITIES LLCin group PARK AVENUE SECURITIES LLC3,203$402K<0.01%+13713F-HRTimelineGroup
RDA Financial Network3,200$402K0.11%013F-HRTimeline
EMERALD ADVISERS, LLCin group EMERALD ADVISERS, LLC3,181$400K0.01%new13F-HRTimelineGroup
Sanctuary Advisors, LLC3,181$400K<0.01%+94213F-HRTimeline
Vise Technologies, Inc.3,170$398K0.02%13F-HRTimeline
Freedom Investment Management, Inc.3,144$395K0.03%+28113F-HRTimeline
PANAGORA ASSET MANAGEMENT INC3,132$393K<0.01%-18713F-HRTimeline
NorthRock Partners, LLC3,116$391K0.01%new13F-HR/ATimeline
Cornerstone Advisors, LLC3,100$389K0.01%-50013F-HRTimeline
Savvy Advisors, Inc.3,065$385K0.03%new13F-HRTimeline
EntryPoint Capital, LLC3,061$384K0.19%-11813F-HRTimeline
Humankind Investments LLC3,039$382K0.09%-45813F-HRTimeline
HORIZON KINETICS ASSET MANAGEMENT LLC3,038$382K<0.01%-13113F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC3,009$378K<0.01%-25013F-HR/ATimelineGroup
Arkadios Wealth Advisors3,003$377K0.01%-35113F-HRTimeline
HUNTER ASSOCIATES INVESTMENT MANAGEMENT…2,936$370K0.05%+3013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…2,914$366K0.01%-5,31113F-HRTimelineGroup
TOWER TRUST & INVESTMENT Co2,895$364K0.26%+16813F-HRTimeline
&PARTNERS2,859$361K<0.01%+1,07613F-HRTimeline
Massachusetts Wealth Management2,874$361K0.2%+11513F-HRTimeline
Forum Financial Management, LPin group Forum Financial Management, LP2,847$358K0.01%-69313F-HRTimelineGroup
Bank Pictet & Cie (Europe) AG2,826$355K0.01%+1,21213F-HRTimeline
Integrated Quantitative Investments LLC2,820$354K0.1%+22013F-HRTimeline
KCM INVESTMENT ADVISORS LLC2,819$354K0.01%-2013F-HRTimeline
Avestar Capital, LLC2,797$351K0.03%+62213F-HRTimeline
Aquatic Capital Management LLC2,792$351K0.01%-32,44013F-HRTimeline
Kennondale Capital Management LLC2,760$347K0.35%013F-HRTimeline
Fiduciary Trust Coin group Fiduciary Trust Co2,754$346K<0.01%-18113F-HRTimelineGroup
Marathon Trading Investment Management …in group Marathon Trading Investment M…2,750$345K0.21%013F-HRTimelineGroup
Uncommon Cents Investing LLC2,739$344K0.09%-71613F-HRTimeline
KLINGENSTEIN FIELDS & CO LP2,731$343K0.01%013F-HRTimeline
Ascent Group, LLCin group Ascent Group, LLC2,714$341K0.01%new13F-HRTimelineGroup
HB Wealth Management, LLC2,712$341K<0.01%+30313F-HRTimeline
Summit Trail Advisors, LLC2,687$337K0.01%new13F-HRTimeline
Quarry LP2,681$337K0.08%-1,07413F-HRTimeline
NewEdge Advisors, LLC2,673$336K<0.01%+31613F-HRTimeline
SUMMITRY LLC2,651$333K0.02%new13F-HRTimeline
Advanced Portfolio Management, LLC2,641$332K0.93%013F-HRTimeline
EAGLE GLOBAL ADVISORS LLC2,625$330K0.01%013F-HRTimeline
Enterprise Bank & Trust Co2,618$329K0.12%-4513F-HRTimeline
Westside Investment Management, Inc.2,580$329K0.06%-8013F-HRTimeline
DRW Securities, LLC2,578$321K0.02%new13F-HRTimeline
Aljian Capital Management, LLC2,540$319K0.07%013F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC2,531$318K<0.01%+3113F-HRTimelineGroup
EXCHANGE TRADED CONCEPTS, LLC2,518$316K<0.01%+11313F-HRTimeline
SHERBROOKE PARK ADVISERS LLC2,512$315K0.14%new13F-HRTimeline
Legacy Wealth Asset Management, LLC2,511$315K0.08%+9113F-HRTimeline
Tema ETFs LLC2,511$315K0.08%+1013F-HRTimeline
PRUDENTIAL PLCin group PRUDENTIAL PLC2,508$315K<0.01%013F-HRTimelineGroup
NJ State Employees Deferred Compensatio…2,500$314K0.04%013F-HRTimeline
DKRT Investments Corp.2,500$314K0.08%13F-HRTimeline
AVANTAX ADVISORY SERVICES, INC.2,498$314K<0.01%new13F-HRTimeline
Magnetar Financial LLCin group Magnetar Financial LLC2,484$312K<0.01%-5,23513F-HRTimelineGroup
TFB Advisors LLC2,471$310K0.08%+3213F-HRTimeline
Chicago Partners Investment Group LLC2,358$309K0.01%new13F-HRTimeline
Callan Family Office, LLC2,454$308K0.01%new13F-HRTimeline
Allegheny Financial Group2,419$304K0.07%013F-HRTimeline
ORACLE INVESTMENT MANAGEMENT INC2,412$303K0.26%013F-HRTimeline
Maven Securities LTDin group Maven Securities LTD2,404$302K0.08%new13F-HRTimelineGroup
SECTORAL ASSET MANAGEMENT INC2,375$298K0.2%-48013F-HRTimeline
J. Safra Sarasin Holding AGin group J. Safra Sarasin Holding AG2,374$298K0.01%-7,63513F-HRTimelineGroup
FLAGSHIP HARBOR ADVISORS, LLC2,338$294K0.01%-10213F-HRTimeline
Wedmont Private Capital2,190$291K0.01%+8113F-HRTimeline
Fayez Sarofim & Coin group Fayez Sarofim & Co2,300$289K<0.01%013F-HRTimelineGroup
Integrated Advisors Network LLC2,298$289K0.01%+11813F-HRTimeline
OPPENHEIMER & CO INCin group OPPENHEIMER ASSET MANAGEMENT …2,264$284K<0.01%-2,02613F-HRTimelineGroup
PHILADELPHIA TRUST CO2,250$283K0.02%013F-HRTimeline
SYON CAPITAL LLC2,252$283K0.02%-79413F-HRTimeline
Richwood Investment Advisors, LLC2,248$282K0.23%-53513F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.2,241$281K0.01%-1213F-HRTimeline
Kestra Advisory Services, LLCgroup of 2 filers holding2,227$280K+252Timeline
TRUST CO OF TOLEDO NA /OH/2,225$279K0.03%-3913F-HRTimeline
Allworth Financial LP2,179$274K<0.01%+1,16213F-HRTimeline
NAVELLIER & ASSOCIATES INC2,164$272K0.03%013F-HRTimeline
Capital Investment Advisors, LLC2,164$272K<0.01%+11113F-HR/ATimeline
Evercore Wealth Management, LLC2,142$269K<0.01%013F-HRTimeline
GREAT VALLEY ADVISOR GROUP, INC.in group GREAT VALLEY ADVISOR GROUP, I…2,076$261K0.01%-1,21513F-HRTimelineGroup
PROATHLETE WEALTH MANAGEMENT LLC2,069$260K0.08%+213F-HRTimeline
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK2,050$257K<0.01%-38313F-HRTimelineGroup
J.W. COLE ADVISORS, INC.2,017$253K0.01%new13F-HRTimeline
PERSONAL CFO SOLUTIONS, LLC2,017$253K0.05%-1013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…2,004$252K0.01%+1,01213F-HRTimelineGroup
Estabrook Capital Management2,000$251K0.04%-3313F-HRTimeline
Heritage Wealth Advisors2,000$251K0.01%013F-HRTimeline
Northwest & Ethical Investments L.P.2,000$251K0.01%013F-HRTimeline
B. Riley Wealth Advisors, Inc.1,991$250K0.01%-23713F-HRTimeline
WEDBUSH SECURITIES INC1,971$248K0.01%+43613F-HRTimeline
Generali Investments, Management Co LLC1,962$246K0.06%013F-HRTimeline
SBI Securities Co., Ltd.1,947$245K0.01%-2813F-HRTimeline
HighPoint Advisor Group LLC1,946$244K0.01%+21013F-HRTimeline
Atria Investments, Inc1,940$244K<0.01%+24313F-HRTimeline
Wilmington Savings Fund Society, FSB1,935$243K<0.01%+1,12913F-HRTimeline
EVERGREEN CAPITAL MANAGEMENT LLC1,932$243K0.01%-1,11013F-HRTimeline
Traub Capital Management LLC1,910$240K0.22%13F-HRTimeline
Claro Advisors Inc.1,902$239K0.04%-97513F-HRTimeline
Stratos Wealth Partners, LTD.in group Stratos Wealth Partners, LTD.1,896$238K<0.01%-34013F-HRTimelineGroup
FLPUTNAM INVESTMENT MANAGEMENT CO1,890$237K<0.01%-19013F-HRTimeline
FORBES J M & CO LLP1,869$235K0.02%013F-HRTimeline
Mutual Advisors, LLC1,780$234K0.01%new13F-HRTimeline
Claret Asset Management Corp1,864$234K0.03%new13F-HRTimeline
CIDEL ASSET MANAGEMENT INC1,862$234K0.01%+19013F-HRTimeline
MISSION WEALTH MANAGEMENT, LP1,856$233K0.01%+613F-HRTimeline
Investors Research Corp1,850$232K0.05%new13F-HRTimeline
PEAPACK GLADSTONE FINANCIAL CORP1,846$232K<0.01%+313F-HRTimeline
Trail Ridge Investment Advisors, LLC1,807$231K0.11%013F-HRTimeline
Rock Point Advisors, LLC1,840$231K0.07%013F-HRTimeline
Compound Planning, Inc.1,800$226K0.01%new13F-HRTimeline
Perpetual Ltdin group Perpetual Ltd1,797$226K<0.01%013F-HRTimelineGroup
Valeo Financial Advisors, LLC1,794$225K0.01%new13F-HR/ATimeline
CITIZENS FINANCIAL GROUP INC/RIin group CITIZENS FINANCIAL GROUP INC/…1,791$225K<0.01%new13F-HRTimelineGroup
EARNED WEALTH ADVISORS, LLC1,779$223K0.04%+28413F-HRTimeline
HANCOCK WHITNEY CORP1,761$221K<0.01%+8113F-HRTimeline
Advisory Services Network, LLC1,724$221K<0.01%-34413F-HRTimeline
INVESTMENT HOUSE LLC1,730$217K0.01%-1,48913F-HRTimeline
MBB PUBLIC MARKETS I LLC1,729$217K0.02%-42113F-HRTimeline
Sivia Capital Partners, LLC1,717$216K0.07%new13F-HR/ATimeline
Clearstead Advisors, LLC1,683$211K<0.01%+49013F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC1,681$211K<0.01%+1,58613F-HRTimelineGroup
Trust Asset Management LLC1,675$210K0.02%013F-HRTimeline
CHOREO, LLC1,671$210K<0.01%new13F-HRTimeline
Kathmere Capital Management, LLC1,663$209K0.02%new13F-HRTimeline
SUMITOMO LIFE INSURANCE CO1,656$208K0.01%-5513F-HRTimeline
Ellevest, Inc.1,651$207K0.03%new13F-HRTimeline
Sava Infond d.o.o.1,650$207K0.03%013F-HRTimeline
Parkside Financial Bank & Trust1,647$207K0.02%+21613F-HRTimeline
Verdence Capital Advisors LLC1,627$204K0.01%+313F-HRTimeline
KENNEDY INVESTMENT GROUP, INC.1,615$203K0.09%-5813F-HRTimeline
Plancorp, LLC1,607$202K0.01%+2013F-HRTimeline
Lighthouse Financial LLC1,600$201K0.15%013F-HRTimeline
Quantbot Technologies LP1,597$201K0.01%-12,54013F-HRTimeline
Optas, LLC1,594$200K0.04%new13F-HRTimeline
STF Management LP1,518$191K0.08%+7613F-HRTimeline
Employees Retirement System of Texas1,467$184K<0.01%new13F-HRTimeline
Livforsakringsbolaget Skandia, Omsesidi…1,430$179K0.01%013F-HR/ATimeline
Deseret Mutual Benefit Administrators1,388$174K0.08%013F-HRTimeline