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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
Vinva Investment Management Ltd6,056$1.31M0.01%+4,69613F-HRTimeline
Bull Harbor Capital LLC6,026$1.3M0.25%+94913F-HRTimeline
Mediolanum International Funds Ltd6,010$1.3M0.01%-4413F-HRTimeline
BEESE FULMER INVESTMENT MANAGEMENT, INC.5,959$1.29M0.07%+1,15613F-HRTimeline
Sanctuary Advisors, LLC5,838$1.26M0.01%+22113F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…5,813$1.26M0.29%+96513F-HRTimelineGroup
Assenagon Asset Management S.A.5,766$1.25M<0.01%-1,20313F-HR/ATimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…5,713$1.23M<0.01%-4,00213F-HRTimelineGroup
North Star Investment Management Corp.5,621$1.21M0.07%013F-HRTimeline
AGP FRANKLIN, LLC5,566$1.2M0.52%+3,49313F-HRTimeline
AIA Group Ltdin group AIA Group Ltd5,545$1.2M0.02%-3,78413F-HR/ATimelineGroup
Twin Tree Management, LP5,507$1.19M0.19%+4,74813F-HRTimeline
GUARDIAN INVESTMENT MANAGEMENT5,500$1.19M0.77%013F-HRTimeline
Daiichi Life Insurance Co., Ltd.in group Daiichi Life Insurance Co., L…5,397$1.17M0.03%-41113F-HRTimelineGroup
INDEPENDENT FINANCIAL GROUP, LLC5,364$1.16M0.02%+16613F-HRTimeline
Lido Advisors, LLCin group Lido Advisors, LLC5,292$1.14M<0.01%+86013F-HRTimelineGroup
Empirical Finance, LLC5,240$1.13M0.05%+17013F-HRTimeline
Elevated Private Wealth, LLC5,234$1.13M1.08%13F-HRTimeline
Annis Gardner Whiting Capital Advisors,…5,233$1.13M0.17%+4113F-HRTimeline
Frank, Rimerman Advisors LLC5,197$1.12M0.06%+313F-HRTimeline
World Investment Advisors6,038$1.11M0.02%-4413F-HRTimeline
Williamson Legacy Group, LLC5,129$1.11M0.55%new13F-HRTimeline
&PARTNERS5,128$1.11M<0.01%+9113F-HRTimeline
COLDSTREAM CAPITAL MANAGEMENT INC5,115$1.11M0.01%+45313F-HRTimeline
Lombard Odier Asset Management (Switzer…5,099$1.1M0.04%+1,20013F-HRTimeline
SIGNATUREFD, LLC5,094$1.1M0.01%+48613F-HRTimeline
Cannell & Spears LLC5,083$1.1M0.02%013F-HRTimeline
Unison Advisors LLC5,078$1.1M0.08%013F-HRTimeline
PRUDENTIAL PLCin group PRUDENTIAL PLC4,924$1.06M0.01%+2,41613F-HRTimelineGroup
OPPENHEIMER ASSET MANAGEMENT INC.group of 2 filers holding4,873$1.05M-51Timeline
LMR Partners LLPin group LMR Partners LLP4,866$1.05M0.01%-111,26513F-HRTimelineGroup
E. Ohman J:or Asset Management AB4,819$1.04M0.02%013F-HRTimeline
CSM Advisors, LLC4,815$1.04M0.02%-49313F-HRTimeline
Sterling Capital Management LLC4,810$1.04M0.02%-32613F-HRTimeline
Abacus Wealth Partners, LLC4,808$1.04M0.11%-4,34513F-HRTimeline
Arkadios Wealth Advisors4,806$1.04M0.02%+2513F-HRTimeline
Holocene Advisors, LP4,793$1.04M<0.01%013F-HRTimeline
Wealthcare Advisory Partners LLCin group Wealthcare Advisory Partners …4,728$1.02M0.02%-66113F-HRTimelineGroup
Vident Advisory, LLCin group Vident Advisory, LLC4,698$1.02M0.01%-40313F-HRTimelineGroup
Chicago Partners Investment Group LLC5,038$1.01M0.02%+44013F-HRTimeline
J. Safra Sarasin Holding AGin group J. Safra Sarasin Holding AG4,895$1M0.01%-10313F-HRTimelineGroup
Meeder Advisory Services, Inc.group of 2 filers holding4,644$1M-1,148Timeline
EFG International AGin group EFG International AG4,582$990K0.02%+12513F-HRTimelineGroup
Beacon Pointe Advisors, LLC4,544$981K<0.01%+46113F-HRTimeline
GILDER GAGNON HOWE & CO LLC4,528$978K0.01%-3013F-HRTimeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …4,486$969K0.01%+13413F-HRTimelineGroup
TWIN CAPITAL MANAGEMENT INC4,465$965K0.11%+3513F-HRTimeline
BNP PARIBASin group BNP PARIBAS4,360$941K0.03%+3,66013F-HRTimelineGroup
V-Square Quantitative Management LLC4,349$940K0.09%-913F-HRTimeline
North Dakota State Investment Board4,343$938K0.04%-2,32713F-HRTimeline
Blackhawk Capital Partners, LLC4,266$922K0.3%+1,84013F-HRTimeline
Providence First Trust Co4,175$902K0.25%+1,09613F-HRTimeline
E Fund Management Co., Ltd.4,174$902K0.02%-1,03513F-HRTimeline
Frec Markets, Inc.in group Frec Markets, Inc.4,158$898K0.08%+1,53013F-HRTimelineGroup
Parallel Advisors, LLC4,145$896K0.01%-22213F-HRTimeline
SUMMITRY LLC4,137$894K0.03%-60013F-HRTimeline
PINNACLE ASSOCIATES LTD4,102$886K0.01%+10313F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC4,092$884K0.01%013F-HRTimeline
Cohen Klingenstein LLC4,000$864K0.02%013F-HRTimeline
Knott David M Jr4,000$864K0.46%013F-HRTimeline
Savvy Advisors, Inc.3,996$863K0.02%+13213F-HRTimeline
Texas Yale Capital Corp.3,987$861K0.02%013F-HRTimeline
Connor, Clark & Lunn Investment Managem…3,948$853K<0.01%new13F-HRTimeline
First County Bank /CT/3,933$850K0.4%-23313F-HRTimeline
AlphaCentric Advisors LLC3,891$841K0.71%+5613F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC3,896$839K<0.01%-2,58313F-HRTimelineGroup
CHESAPEAKE CAPITAL CORP /IL/3,879$838K0.45%+33513F-HRTimeline
Sivia Capital Partners, LLC3,879$838K0.1%+87613F-HRTimeline
FARMERS & MERCHANTS INVESTMENTS INCin group FARMERS & MERCHANTS INVESTMEN…3,830$828K0.02%-11113F-HRTimelineGroup
SECURIAN ASSET MANAGEMENT, INC3,945$813K0.03%013F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC3,701$799K<0.01%+57413F-HRTimelineGroup
Wahed Invest LLC3,696$799K0.08%+2113F-HRTimeline
Waverly Advisors, LLC3,678$795K<0.01%+52713F-HRTimeline
Jones Kertz & Associates, Inc.3,666$792K0.37%-56513F-HRTimeline
Farther Finance Advisors, LLC3,649$788K0.01%+5213F-HRTimeline
Siemens Fonds Invest GmbH3,633$785K0.04%013F-HRTimeline
Osmosis Investment Management UK Ltd3,629$784K0.04%-3,02313F-HRTimeline
XXI WEALTH, LLC3,603$778K0.36%-4813F-HRTimeline
Empirical Financial Services, LLC d.b.a…3,601$778K0.01%+85013F-HRTimeline
Ellevest, Inc.3,573$772K0.09%-37313F-HRTimeline
Atria Investments, Inc3,573$772K0.01%+1,13613F-HRTimeline
USA FINANCIAL FORMULAS3,548$767K0.14%13F-HRTimeline
ELEVATION POINT WEALTH PARTNERS, LLC3,519$760K0.01%-20513F-HRTimeline
Pavaki Capital Management LLC3,500$756K0.43%013F-HRTimeline
SYON CAPITAL LLC3,492$754K0.03%+36213F-HRTimeline
PRAXIS INVESTMENT MANAGEMENT INC3,450$745K0.04%013F-HRTimeline
Ironwood Financial, llc3,535$739K0.12%013F-HRTimeline
F/m Investments LLC3,389$732K0.04%+27213F-HRTimeline
Avestar Capital, LLC3,371$728K0.04%-23313F-HRTimeline
Lifeworks Advisors, LLC3,326$719K0.08%-13913F-HRTimeline
NLB Skladi, upravljanje premozenja, d.o…3,293$711K0.03%+23813F-HRTimeline
CITIZENS FINANCIAL GROUP INC/RIin group CITIZENS FINANCIAL GROUP INC/…3,282$709K0.01%+93613F-HRTimelineGroup
Vestcor Inc3,246$701K0.02%013F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd3,239$700K0.01%new13F-HRTimelineGroup
Massachusetts Wealth Management3,230$698K0.27%+5013F-HRTimeline
TRUST CO OF TOLEDO NA /OH/3,217$695K0.06%+25213F-HRTimeline
South Dakota Investment Council3,213$694K0.01%013F-HRTimeline
STONERIDGE INVESTMENT PARTNERS LLC3,414$693K0.45%-3,61513F-HRTimeline
Davis Investment Partners, LLC3,184$688K0.21%-39613F-HRTimeline
BROWN ADVISORY INCin group BROWN ADVISORY INC3,155$682K<0.01%-3,68913F-HRTimelineGroup
Bank Pictet & Cie (Europe) AG3,103$670K0.01%+22313F-HRTimeline
Hills Bank & Trust Coin group Hills Bank & Trust Co3,088$667K0.03%-40213F-HRTimelineGroup
SteelPeak Wealth, LLC3,011$651K0.02%+30713F-HRTimeline
Pitcairn Wealth Advisors LLCin group PITCAIRN CO3,010$650K0.07%+31313F-HRTimelineGroup
Aprio Wealth Management, LLC3,009$650K0.03%+15913F-HRTimeline
EVERGREEN CAPITAL MANAGEMENT LLC3,003$649K0.01%-7813F-HRTimeline
ROBERTS GLORE & CO INC /IL/3,001$648K0.16%013F-HRTimeline
RDA Financial Network3,000$648K0.14%-12513F-HRTimeline
Motley Fool Asset Management LLCin group Motley Fool Asset Management …2,978$643K0.02%+5913F-HRTimelineGroup
WADDELL & ASSOCIATES, LLC2,967$641K0.03%+70313F-HRTimeline
ATLAS CAPITAL ADVISORS INC.2,930$633K0.07%-2813F-HR/ATimeline
State of Wyoming2,923$632K0.06%+1,62713F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…2,906$628K0.02%-27213F-HRTimelineGroup
HUNTER ASSOCIATES INVESTMENT MANAGEMENT…2,901$626K0.07%-3813F-HRTimeline
Caerus Investment Advisors, LLC2,893$625K0.21%+9213F-HRTimeline
CSS LLC/IL2,880$622K0.03%+16013F-HRTimeline
ExodusPoint Capital Management, LP2,871$620K0.01%-149,12213F-HRTimeline
SAX WEALTH ADVISORS, LLC3,364$617K0.03%+3413F-HRTimeline
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK2,848$615K<0.01%+24113F-HRTimelineGroup
Legacy Capital Group California, Inc.2,844$614K0.19%-5713F-HRTimeline
TOWER TRUST & INVESTMENT Co2,818$609K0.37%-5013F-HRTimeline
Baker Avenue Asset Management, LP2,808$607K0.01%+60113F-HRTimeline
KCM INVESTMENT ADVISORS LLC2,799$605K0.02%-413F-HRTimeline
IKE Capital, LLC2,794$604K0.32%-40013F-HRTimeline
Compound Planning, Inc.2,792$603K0.02%+5013F-HRTimeline
Premier Path Wealth Partners, LLC2,786$602K0.07%-73713F-HRTimeline
AZZAD ASSET MANAGEMENT INC /ADV2,784$601K0.05%new13F-HRTimeline
WESTWOOD HOLDINGS GROUP INCin group WESTWOOD HOLDINGS GROUP INC2,782$601K<0.01%new13F-HRTimelineGroup
Wedmont Private Capital3,012$600K0.02%+10413F-HRTimeline
Tema ETFs LLC2,772$599K0.02%+14513F-HRTimeline
Uncommon Cents Investing LLC2,769$598K0.13%-1013F-HRTimeline
ROTHSCHILD INVESTMENT LLC2,739$592K0.02%+1,83013F-HRTimeline
KLINGENSTEIN FIELDS & CO LP2,731$590K0.02%013F-HRTimeline
HORIZON KINETICS ASSET MANAGEMENT LLC2,726$589K0.01%-13113F-HRTimeline
Crestwood Advisors Group, LLC2,725$589K0.01%+24413F-HRTimeline
Proficio Capital Partners LLC2,701$584K0.02%new13F-HRTimeline
Northwest & Ethical Investments L.P.2,693$582K0.01%+69313F-HRTimeline
Westside Investment Management, Inc.2,634$569K0.07%-313F-HRTimeline
CHOREO, LLC2,633$569K0.01%+25313F-HRTimeline
Parcion Private Wealth LLC2,609$564K0.03%+46913F-HRTimeline
EAGLE GLOBAL ADVISORS LLC2,609$564K0.02%+913F-HRTimeline
CIM INVESTMENT MANAGEMENT INC2,571$555K0.13%-25913F-HRTimeline
NWAM LLC2,553$552K0.03%+1,41213F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC2,535$548K<0.01%-15513F-HRTimelineGroup
TD PRIVATE CLIENT WEALTH LLC2,512$543K0.01%+60313F-HRTimeline
Private Advisor Group, LLC2,510$542K<0.01%-2,13913F-HRTimeline
DKRT Investments Corp.2,500$540K0.13%013F-HRTimeline
9823 Capital, L.P.2,494$539K0.36%new13F-HRTimeline
Aljian Capital Management, LLC2,475$535K0.1%-6513F-HRTimeline
BSW Wealth Partners2,462$532K0.06%+38813F-HRTimeline
TCW GROUP INCin group TCW GROUP INC2,461$532K<0.01%+12313F-HRTimelineGroup
Prime Capital Investment Advisors, LLC2,427$524K0.01%-60313F-HRTimeline
HANTZ FINANCIAL SERVICES, INC.2,424$524K0.01%+26713F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
TFB Advisors LLC2,424$524K0.23%+113F-HRTimeline
PERSONAL CFO SOLUTIONS, LLC2,416$522K0.08%+5413F-HRTimeline
MISSION WEALTH MANAGEMENT, LP2,387$516K0.01%+76613F-HRTimeline
TRANSCEND CAPITAL ADVISORS, LLC2,363$511K0.03%+53313F-HRTimeline
Fayez Sarofim & Coin group Fayez Sarofim & Co2,300$497K<0.01%013F-HRTimelineGroup
Parallax Volatility Advisers, L.P.2,291$495K0.02%+60213F-HRTimeline
Concurrent Investment Advisors, LLCin group Concurrent Investment Advisor…2,272$491K<0.01%+5013F-HRTimelineGroup
Richwood Investment Advisors, LLC2,267$490K0.34%+23513F-HRTimeline
Simplicity Wealth,LLC2,259$488K0.02%+11013F-HRTimeline
Apollon Wealth Management, LLCin group Apollon Wealth Management, LLC2,210$477K0.01%+76813F-HRTimelineGroup
TOMPKINS FINANCIAL CORPin group TOMPKINS FINANCIAL CORP2,200$475K0.03%new13F-HRTimelineGroup
Axxion S.A.2,200$475K0.03%13F-HRTimeline
NAVELLIER & ASSOCIATES INC2,164$468K0.04%013F-HRTimeline
Smartleaf Asset Management LLC2,125$460K0.01%013F-HRTimeline
Evercore Wealth Management, LLC2,112$456K0.01%013F-HRTimeline
B. Riley Wealth Advisors, Inc.2,094$454K0.02%+3013F-HRTimeline
Ramiah Investment Group2,085$450K0.34%new13F-HRTimeline
Blackstone Inc.in group Blackstone Inc.2,060$445K<0.01%new13F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
Capital Investment Advisors, LLC2,045$442K0.01%-4213F-HRTimeline
QTR Family Wealth, LLC2,041$441K0.15%+5113F-HRTimeline
EVOLVE PRIVATE WEALTH, LLC2,032$439K0.03%-1,50413F-HRTimeline
EP Wealth Advisors, LLC2,024$437K<0.01%+32313F-HRTimeline
GROUPAMA ASSET MANAGMENT2,017$436K0.01%-6,73613F-HRTimeline
AlphaCore Capital LLC2,010$434K0.01%+67813F-HRTimeline
Heritage Wealth Advisors2,009$434K0.01%013F-HRTimeline
Procyon Advisors, LLC2,005$433K0.02%-5813F-HRTimeline
Estabrook Capital Management2,000$432K0.06%013F-HRTimeline
Jackson Creek Investment Advisors LLC2,127$432K0.14%-3,53513F-HRTimeline
DZ BANK AG Deutsche Zentral Genossensch…in group DZ BANK AG Deutsche Zentral G…1,966$423K<0.01%-20,96013F-HRTimelineGroup
CIDEL ASSET MANAGEMENT INC1,952$422K0.02%-17713F-HRTimeline
DoubleLine ETF Adviser LP1,947$421K0.17%-17813F-HRTimeline
SAGESPRING WEALTH PARTNERS, LLC1,937$419K0.01%+2413F-HRTimeline
Parkside Financial Bank & Trust1,900$411K0.03%+4513F-HRTimeline
Camelot Portfolios, LLC1,900$411K0.29%013F-HRTimeline
PKO Investment Management Joint-Stock Co1,900$411K0.03%+60013F-HRTimeline
Stratos Wealth Partners, LTD.in group Stratos Wealth Partners, LTD.1,899$410K<0.01%-1313F-HRTimelineGroup
Forum Financial Management, LPin group Forum Financial Management, LP1,890$408K0.01%013F-HRTimelineGroup
SummitTX Capital, L.P.1,872$404K0.01%-19,78413F-HRTimeline
Colonial River Investments, LLC1,871$404K0.11%+4113F-HRTimeline
FORBES J M & CO LLP1,869$404K0.03%013F-HRTimeline
Resonant Capital Advisors, LLC1,862$402K0.02%-1213F-HRTimeline
FLPUTNAM INVESTMENT MANAGEMENT CO1,861$402K<0.01%013F-HRTimeline
SECTORAL ASSET MANAGEMENT INC1,850$400K0.28%013F-HRTimeline
WESTPAC BANKING CORPin group WESTPAC BANKING CORP1,843$398K0.02%013F-HRTimelineGroup
Rock Point Advisors, LLC1,840$398K0.1%013F-HRTimeline
Oslo Pensjonsforsikring AS1,840$398K0.05%013F-HRTimeline
Everhart Financial Group, Inc.1,840$398K0.03%+213F-HRTimeline