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Disclosery

BIIB BIOGEN INC

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Stock (common), issuer CIK 875045

983 managers (1,014 13F filers) reported a position in BIIB shares at 2026-03-31, 135,049,061 shares in all. 113 filers opened a position and 107 filers sold out during the quarter.

Managers
983
13F filers
1,014
New
113
Added
402
Reduced
290
Sold out
107
Shares held by filers
135,049,061

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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
LORING WOLCOTT & COOLIDGE FIDUCIARY ADV…6,193$1.07M0.01%013F-HRTimeline
Kestra Advisory Services, LLCin group Kestra Advisory Services, LLC5,810$1.07M<0.01%+1,30113F-HRTimelineGroup
Daiichi Life Insurance Co., Ltd.in group Daiichi Life Insurance Co., L…5,808$1.06M0.03%-21113F-HRTimelineGroup
Meeder Advisory Services, Inc.group of 2 filers holding5,792$1.06M+912Timeline
Essential Partners LLC5,719$1.05M0.35%+513F-HRTimeline
HB Wealth Management, LLC5,681$1.04M0.01%+1,01113F-HRTimeline
Jackson Creek Investment Advisors LLC5,662$1.04M0.31%new13F-HRTimeline
North Star Investment Management Corp.5,621$1.03M0.06%-2113F-HRTimeline
Sanctuary Advisors, LLC5,617$1.03M0.01%+44513F-HRTimeline
SIG BROKERAGE, LP5,500$1.01M0.29%-5,42213F-HRTimeline
GUARDIAN INVESTMENT MANAGEMENT5,500$1.01M0.8%+10013F-HRTimeline
Saudi Central Bank5,415$993K0.02%new13F-HRTimeline
Wealthcare Advisory Partners LLCin group Wealthcare Advisory Partners …5,389$988K0.02%+8713F-HRTimelineGroup
CSM Advisors, LLC5,308$974K0.02%-17313F-HRTimeline
E Fund Management Co., Ltd.5,209$955K0.03%13F-HRTimeline
Vise Technologies, Inc.5,415$953K0.02%013F-HRTimeline
INDEPENDENT FINANCIAL GROUP, LLC5,198$953K0.02%-61613F-HR/ATimeline
Frank, Rimerman Advisors LLC5,194$952K0.06%+1213F-HRTimeline
Annis Gardner Whiting Capital Advisors,…5,192$952K0.15%+213F-HRTimeline
Sterling Capital Management LLC5,136$942K0.02%-3,52513F-HRTimeline
Taproot Management LP5,133$941K0.18%new13F-HRTimeline
Vident Advisory, LLCin group Vident Advisory, LLC5,101$935K0.01%+89613F-HRTimelineGroup
Cannell & Spears LLC5,083$932K0.02%+413F-HR/ATimeline
Unison Advisors LLC5,078$931K0.07%013F-HRTimeline
Bull Harbor Capital LLC5,077$931K0.25%13F-HRTimeline
Empirical Finance, LLC5,070$929K0.04%-613F-HR/ATimeline
Birchview Capital, LP5,000$917K0.52%new13F-HRTimeline
J. Safra Sarasin Holding AGin group J. Safra Sarasin Holding AG4,998$915K0.02%-1,47613F-HRTimelineGroup
Plato Investment Management Ltd4,939$906K0.06%013F-HRTimeline
OPPENHEIMER ASSET MANAGEMENT INC.group of 2 filers holding4,924$903K+1,912Timeline
&PARTNERS5,037$893K<0.01%+75213F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…4,848$889K0.25%+92513F-HRTimelineGroup
E. Ohman J:or Asset Management AB4,819$883K0.02%-90013F-HRTimeline
BEESE FULMER INVESTMENT MANAGEMENT, INC.4,803$881K0.06%+2,53113F-HRTimeline
Holocene Advisors, LP4,793$879K<0.01%new13F-HRTimeline
Arkadios Wealth Advisors4,781$877K0.01%+20613F-HRTimeline
Chicago Partners Investment Group LLC4,598$874K0.02%+1,78213F-HRTimeline
SUMMITRY LLC4,737$868K0.03%-5713F-HR/ATimeline
Arrowpoint Investment Partners (Singapo…in group Arrowpoint Investment Partner…4,706$863K1.25%+1,85113F-HRTimelineGroup
MAI Capital Management4,702$862K<0.01%+1,25513F-HRTimeline
COLDSTREAM CAPITAL MANAGEMENT INC4,662$855K0.01%-12013F-HRTimeline
Private Advisor Group, LLC4,649$852K<0.01%-1,46413F-HRTimeline
SIGNATUREFD, LLC4,608$845K0.01%+23813F-HRTimeline
GILDER GAGNON HOWE & CO LLC4,558$836K0.01%new13F-HRTimeline
EFG International AGin group EFG International AG4,457$817K0.02%+1,82213F-HRTimelineGroup
Lido Advisors, LLCin group Lido Advisors, LLC4,432$813K<0.01%-1,55913F-HRTimelineGroup
TWIN CAPITAL MANAGEMENT INC4,430$812K0.1%new13F-HRTimeline
Econ Financial Services Corp4,397$806K0.37%+45113F-HRTimeline
Parallel Advisors, LLC4,367$801K0.01%+6513F-HR/ATimeline
LBP AM SA4,367$801K0.01%new13F-HRTimeline
V-Square Quantitative Management LLC4,358$799K0.08%+23813F-HRTimeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …4,352$798K0.01%-1,11713F-HRTimelineGroup
Jones Kertz & Associates, Inc.4,231$776K0.41%-26013F-HRTimeline
STOREBRAND ASSET MANAGEMENT AS4,223$774K<0.01%+17513F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.4,213$772K<0.01%-5,47813F-HRTimelineGroup
Allworth Financial LP4,211$772K<0.01%+72513F-HRTimeline
First County Bank /CT/4,166$764K0.41%-24613F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC4,092$750K0.01%-1,45013F-HRTimeline
Beacon Pointe Advisors, LLC4,083$749K<0.01%+68213F-HRTimeline
CI INVESTMENTS INC.in group CI INVESTMENTS INC.4,078$748K<0.01%-31913F-HRTimelineGroup
Cohen Klingenstein LLC4,000$733K0.02%013F-HRTimeline
Knott David M Jr4,000$733K0.44%-2,00013F-HRTimeline
PINNACLE ASSOCIATES LTD3,999$733K0.01%-15613F-HRTimeline
Texas Yale Capital Corp.3,987$731K0.02%013F-HRTimeline
Ellevest, Inc.3,946$723K0.1%-1,22113F-HRTimeline
SECURIAN ASSET MANAGEMENT, INC3,945$723K0.03%013F-HRTimeline
FARMERS & MERCHANTS INVESTMENTS INCin group FARMERS & MERCHANTS INVESTMEN…3,941$723K0.02%013F-HRTimelineGroup
Lombard Odier Asset Management (Switzer…3,899$715K0.03%new13F-HRTimeline
Savvy Advisors, Inc.3,864$708K0.02%-38513F-HRTimeline
AlphaCentric Advisors LLC3,835$703K0.7%+20813F-HRTimeline
Burns Matteson Capital Management, LLC3,818$700K0.27%-10113F-HRTimeline
ELEVATION POINT WEALTH PARTNERS, LLC3,724$683K0.02%new13F-HRTimeline
Wahed Invest LLC3,675$674K0.09%-17113F-HRTimeline
Bellevue Group AGin group Bellevue Group AG3,653$670K0.02%+8813F-HRTimelineGroup
XXI WEALTH, LLC3,651$669K0.38%+1,13613F-HRTimeline
Siemens Fonds Invest GmbH3,633$666K0.04%+11213F-HRTimeline
Farther Finance Advisors, LLC3,597$661K0.01%+1,94113F-HRTimeline
Avestar Capital, LLC3,604$661K0.05%+6913F-HRTimeline
Davis Investment Partners, LLC3,580$656K0.23%-79413F-HRTimeline
CHESAPEAKE CAPITAL CORP /IL/3,544$650K0.47%013F-HRTimeline
EVOLVE PRIVATE WEALTH, LLC3,536$648K0.03%+35313F-HRTimeline
Ironwood Financial, llc3,535$648K0.11%013F-HRTimeline
Premier Path Wealth Partners, LLC3,523$646K0.08%-2,20713F-HRTimeline
Pavaki Capital Management LLC3,500$642K0.45%013F-HRTimeline
STRS OHIO3,494$641K<0.01%-513F-HRTimeline
Hills Bank & Trust Coin group Hills Bank & Trust Co3,490$640K0.03%-1,12913F-HRTimelineGroup
Lifeworks Advisors, LLC3,465$635K0.08%-46813F-HRTimeline
PRAXIS INVESTMENT MANAGEMENT INC3,450$632K0.04%013F-HRTimeline
WINTON GROUP Ltdin group WINTON GROUP Ltd3,297$604K0.02%-6,84813F-HRTimelineGroup
Vestcor Inc3,246$595K0.02%013F-HRTimeline
South Dakota Investment Council3,213$589K0.01%013F-HRTimeline
SAX WEALTH ADVISORS, LLC3,330$586K0.03%013F-HRTimeline
IKE Capital, LLC3,194$586K0.33%013F-HRTimeline
Massachusetts Wealth Management3,180$583K0.25%+18113F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…3,178$583K0.02%+78013F-HR/ATimelineGroup
Waverly Advisors, LLC3,151$578K<0.01%+35813F-HRTimeline
SYON CAPITAL LLC3,130$574K0.03%-1613F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC3,127$573K<0.01%+41613F-HRTimelineGroup
RDA Financial Network3,125$573K0.14%-7513F-HRTimeline
F/m Investments LLC3,117$571K0.04%+65213F-HRTimeline
Cambridge Investment Research Advisors,…3,113$571K<0.01%-4,70613F-HRTimeline
EVERGREEN CAPITAL MANAGEMENT LLC3,081$565K0.01%+49313F-HRTimeline
Providence First Trust Co3,079$564K0.2%new13F-HRTimeline
NLB Skladi, upravljanje premozenja, d.o…3,055$560K0.03%-18,95213F-HRTimeline
Prime Capital Investment Advisors, LLC3,030$555K0.01%-19613F-HRTimeline
Sivia Capital Partners, LLC3,003$551K0.11%+68813F-HRTimeline
ROBERTS GLORE & CO INC /IL/3,001$550K0.15%-8013F-HRTimeline
TRUST CO OF TOLEDO NA /OH/2,965$544K0.05%+45813F-HRTimeline
ATLAS CAPITAL ADVISORS INC.2,958$542K0.06%+11413F-HRTimeline
HUNTER ASSOCIATES INVESTMENT MANAGEMENT…2,939$539K0.07%+5313F-HRTimeline
Motley Fool Asset Management LLCin group Motley Fool Asset Management …2,919$535K0.02%+37813F-HRTimelineGroup
iSAM Funds (UK) Ltdin group iSAM Funds (UK) Ltd2,916$535K0.26%new13F-HRTimelineGroup
Legacy Capital Group California, Inc.2,901$532K0.2%new13F-HRTimeline
DGS Capital Management, LLCin group DGS Capital Management, LLC2,886$529K0.09%+70413F-HRTimelineGroup
Bank Pictet & Cie (Europe) AG2,880$528K0.01%-8913F-HRTimeline
TOWER TRUST & INVESTMENT Co2,868$526K0.35%+1113F-HRTimeline
HORIZON KINETICS ASSET MANAGEMENT LLC2,857$524K0.01%-13113F-HRTimeline
Wedmont Private Capital2,908$523K0.02%+11513F-HRTimeline
Aprio Wealth Management, LLC2,850$522K0.03%+90013F-HRTimeline
CIM INVESTMENT MANAGEMENT INC2,830$519K0.14%-1413F-HRTimeline
KCM INVESTMENT ADVISORS LLC2,803$514K0.02%+413F-HRTimeline
Caerus Investment Advisors, LLC2,801$514K0.22%+13413F-HRTimeline
Uncommon Cents Investing LLC2,779$509K0.12%013F-HRTimeline
Empirical Financial Services, LLC d.b.a…2,751$504K0.01%+53313F-HRTimeline
Waterfront Wealth Inc.2,747$504K0.09%-2213F-HRTimeline
Compound Planning, Inc.2,742$503K0.02%-53613F-HRTimeline
KLINGENSTEIN FIELDS & CO LP2,731$501K0.02%013F-HRTimeline
CSS LLC/IL2,720$499K0.03%-3,36013F-HRTimeline
SteelPeak Wealth, LLC2,704$496K0.02%new13F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC2,690$493K<0.01%+29813F-HRTimelineGroup
Frec Markets, Inc.in group Frec Markets, Inc.2,628$482K0.08%+47413F-HRTimelineGroup
Tema ETFs LLC2,627$482K0.03%+713F-HRTimeline
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK2,607$478K<0.01%+16013F-HRTimelineGroup
Westside Investment Management, Inc.2,637$478K0.07%+12513F-HRTimeline
EAGLE GLOBAL ADVISORS LLC2,600$477K0.02%013F-HRTimeline
Pitcairn Wealth Advisors LLCin group PITCAIRN CO2,697$475K0.04%+13213F-HRTimelineGroup
Aljian Capital Management, LLC2,540$466K0.1%+12513F-HRTimeline
Clearstead Advisors, LLC2,523$463K<0.01%+27413F-HRTimeline
PRUDENTIAL PLCin group PRUDENTIAL PLC2,508$460K<0.01%013F-HRTimelineGroup
DKRT Investments Corp.2,500$458K0.12%013F-HRTimeline
Crestwood Advisors Group, LLC2,481$455K0.01%+28713F-HRTimeline
Atria Investments, Inc2,437$447K<0.01%-76613F-HRTimeline
Blackhawk Capital Partners, LLC2,426$445K0.16%+33913F-HRTimeline
TFB Advisors LLC2,423$444K0.23%-2513F-HRTimeline
CHOREO, LLC2,380$436K0.01%+313F-HRTimeline
PERSONAL CFO SOLUTIONS, LLC2,362$433K0.06%-4113F-HRTimeline
PDT Partners, LLC2,348$430K0.03%013F-HRTimeline
CITIZENS FINANCIAL GROUP INC/RIin group CITIZENS FINANCIAL GROUP INC/…2,346$430K0.01%+54913F-HRTimelineGroup
TCW GROUP INCin group TCW GROUP INC2,338$429K<0.01%+11213F-HRTimelineGroup
Philip James Wealth Mangement, LLC2,323$426K0.05%-513F-HRTimeline
Fayez Sarofim & Coin group Fayez Sarofim & Co2,300$422K<0.01%013F-HRTimelineGroup
WADDELL & ASSOCIATES, LLC2,264$415K0.02%+52213F-HRTimeline
Quantitative Investment Management, LLC2,255$413K0.04%+64113F-HRTimeline
INCEPTIONR LLC2,248$412K0.1%-2,62813F-HRTimeline
Concurrent Investment Advisors, LLCin group Concurrent Investment Advisor…2,222$407K<0.01%-2,15413F-HRTimelineGroup
Baker Avenue Asset Management, LP2,207$405K0.01%+61013F-HRTimeline
Smartleaf Asset Management LLC2,125$399K0.01%+27313F-HRTimeline
NAVELLIER & ASSOCIATES INC2,164$397K0.04%013F-HRTimeline
SIMPLEX TRADING, LLC2,164$397K0.01%-28,71413F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…2,159$396K0.01%-1,67213F-HRTimelineGroup
HANTZ FINANCIAL SERVICES, INC.2,157$395K0.01%+32113F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Simplicity Wealth,LLC2,149$394K0.02%+19713F-HRTimeline
Parcion Private Wealth LLC2,140$392K0.02%+4413F-HRTimeline
CIDEL ASSET MANAGEMENT INC2,129$390K0.02%+19013F-HRTimeline
DoubleLine ETF Adviser LP2,125$390K0.15%new13F-HRTimeline
Evercore Wealth Management, LLC2,112$387K0.01%-3013F-HRTimeline
B. Riley Wealth Advisors, Inc.2,064$387K0.03%+6813F-HRTimeline
SECTORAL ASSET MANAGEMENT INC1,850$386K0.32%-30513F-HRTimeline
Capital Investment Advisors, LLC2,087$383K0.01%+8613F-HR/ATimeline
BSW Wealth Partners2,074$380K0.05%+16513F-HRTimeline
AGP FRANKLIN, LLC2,073$380K0.19%new13F-HRTimeline
Procyon Advisors, LLC2,063$378K0.02%+66613F-HRTimeline
Richwood Investment Advisors, LLC2,032$373K0.29%-9013F-HRTimeline
Heritage Wealth Advisors2,009$368K0.01%+913F-HRTimeline
Estabrook Capital Management2,000$367K0.05%013F-HRTimeline
Northwest & Ethical Investments L.P.2,000$367K0.01%013F-HRTimeline
PROATHLETE WEALTH MANAGEMENT LLC1,944$356K0.1%-16413F-HRTimeline
QTR Family Wealth, LLC1,990$356K0.15%+13813F-HRTimeline
SAGESPRING WEALTH PARTNERS, LLC1,913$351K0.01%+65913F-HRTimeline
Stratos Wealth Partners, LTD.in group Stratos Wealth Partners, LTD.1,912$351K<0.01%-1313F-HRTimelineGroup
TD PRIVATE CLIENT WEALTH LLC1,909$350K0.01%+1,45213F-HRTimeline
Persistent Asset Partners Ltd1,903$349K0.14%-97113F-HRTimeline
Camelot Portfolios, LLC1,900$348K0.26%013F-HRTimeline
Forum Financial Management, LPin group Forum Financial Management, LP1,890$346K<0.01%-3,99713F-HRTimelineGroup
Resonant Capital Advisors, LLC1,874$344K0.02%+19013F-HRTimeline
FORBES J M & CO LLP1,869$343K0.03%013F-HRTimeline
FLPUTNAM INVESTMENT MANAGEMENT CO1,861$341K0.01%-3713F-HRTimeline
Parkside Financial Bank & Trust1,855$340K0.03%+8413F-HRTimeline
Investors Research Corp1,850$339K0.06%013F-HRTimeline
WESTPAC BANKING CORPin group WESTPAC BANKING CORP1,843$338K0.02%-33513F-HRTimelineGroup
Applied Finance Capital Management, LLC1,842$338K0.03%+3813F-HRTimeline
Rock Point Advisors, LLC1,840$337K0.09%013F-HRTimeline
Oslo Pensjonsforsikring AS1,840$337K0.05%013F-HRTimeline
Everhart Financial Group, Inc.1,838$337K0.03%+18113F-HRTimeline
Claret Asset Management Corp1,834$336K0.04%+113F-HRTimeline
TRANSCEND CAPITAL ADVISORS, LLC1,830$335K0.03%+18113F-HRTimeline
Colonial River Investments, LLC1,830$335K0.12%-44313F-HRTimeline
EXCHANGE TRADED CONCEPTS, LLC1,823$334K<0.01%-26113F-HRTimeline
Brand Asset Management Group, Inc.1,814$333K0.09%new13F-HRTimeline
VestGen Advisors, LLC1,662$331K0.01%-5,22213F-HRTimeline