13F

Stock

Biogen Inc.

BIIB · held by 997 managers

Reported value

$23.6B

Holders

997

+5 new · −4 exited

Holders’ est. mark

$292.3M

Price effect on 11 books still in the name

Largest holder

$3.07B

Vanguard

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
Vanguard17.4M$3.07BHeld
BlackRock, Inc.14.8M$2.61BHeld
PRIMECAP MANAGEMENT CO/CA/14.8M$2.6BHeld
Fidelity9.43M$1.66BHeld
State Street7.16M$1.26BHeld
GEODE CAPITAL MANAGEMENT, LLC4.2M$736.4MHeld
WELLINGTON MANAGEMENT GROUP LLP3.55M$625MHeld
Point72 Asset Management, L.P.2.81M$495.1MHeld
NORGES BANK2.64M$464.4M$84.3MAdded$169.7M
MORGAN STANLEY2.33M$409.2M$80.9MAdded$93.8M
JPMORGAN CHASE & CO1.86M$326.9MHeld
Boston Partners1.72M$302.8MHeld
Invesco Ltd.1.66M$291.3MHeld
Icahn Capital1.53M$269MHeld
Legal & General Group Plc1.46M$256.9MHeld
NORTHERN TRUST CORP1.45M$254.5MHeld
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC1.39M$244.9MHeld
BARCLAYS PLC1.31M$229.7M$46.9MAdded$39.2M
Pacer Advisors, Inc.1.29M$201.8MHeld
CHARLES SCHWAB INVESTMENT MANAGEMENT INC1.14M$201.3MHeld
BANK OF AMERICA CORP /DE/1.13M$198.7M$40.5MAdded$27.8M
MILLENNIUM MANAGEMENT LLC1.13M$198.1MHeld
GOLDMAN SACHS GROUP INC1.1M$193.5MHeld
Alyeska Investment Group, L.P.1.02M$180.3MHeld
DIMENSIONAL FUND ADVISORS LP960.6K$169.1MHeld
DEUTSCHE BANK AG\953.7K$167.8MHeld
Pictet Asset Management Holding SA947.5K$166.9MHeld
Bank of New York Mellon Corp811.1K$142.7MHeld
FRED ALGER MANAGEMENT, LLC798.8K$140.6MHeld
MASSACHUSETTS FINANCIAL SERVICES CO /MA/712.6K$125.4MHeld
Employees Provident Fund Board704.2K$123.9M$25.3MAdded$25.3M
SUSQUEHANNA INTERNATIONAL GROUP, LLP661.7K$116.4MHeld
UBS Group AG641.8K$112.9MHeld
Robeco Institutional Asset Management B.V.610.9K$107.5MHeld
Balyasny Asset Management L.P.608K$107MHeld
Caisse de depot et placement du Quebec588.5K$103.6MHeld
Patient Capital Management, LLC576.4K$101.4MHeld
CITIGROUP INC573.8K$101MHeld
Amundi572.4K$100.7MHeld
FIRST TRUST ADVISORS LP565.8K$99.6MHeld
ROYAL BANK OF CANADA541.8K$95.4MHeld
CAUSEWAY CAPITAL MANAGEMENT LLC521.1K$91.7MHeld
BNP PARIBAS FINANCIAL MARKETS508.1K$89.4MHeld
HSBC HOLDINGS PLC503.8K$88.8MHeld
AustralianSuper Pty Ltd476.8K$83.9MHeld
Zurcher Kantonalbank (Zurich Cantonalbank)452.4K$79.6MHeld
Swiss National Bank401.8K$70.7MHeld
Renaissance Technologies399.2K$70.3MHeld
MARSHALL WACE, LLP385.9K$67.9MHeld
Nuveen, LLC375.6K$66.1MHeld
Sumitomo Mitsui Trust Group, Inc.370.6K$65.2MHeld
PRUDENTIAL FINANCIAL INC353.5K$62.2MHeld
Jain Global LLC353.2K$62.2MHeld
Man Group plc339.3K$59.7MHeld
California Public Employees Retirement System330.8K$58.2MHeld
Candriam S.C.A.330.5K$58.2MHeld
Mitsubishi UFJ Asset Management Co., Ltd.319.9K$56.9MHeld
FIL Ltd319.5K$56.2MHeld
ADAGE CAPITAL PARTNERS GP, L.L.C.294.4K$51.8MHeld
Fisher Asset Management, LLC293.3K$51.6MHeld
GLENVIEW CAPITAL MANAGEMENT, LLC290.6K$51.1MHeld
National Pension Service287.2K$50.6MHeld
Gotham Asset Management, LLC276.8K$48.7MHeld
RHUMBLINE ADVISERS271.7K$47.8MHeld
AEGON ASSET MANAGEMENT UK Plc260.2K$45.8MNew
TWO SIGMA INVESTMENTS, LP251.8K$44.3MHeld
Allianz Asset Management GmbH247.7K$43.6MHeld
VICTORY CAPITAL MANAGEMENT INC246.7K$43.4MHeld
Swedbank AB231.6K$40.8MHeld
Artemis Investment Management LLP226.8K$39.9MHeld
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM226.4K$39.8MHeld
Hudson Bay Capital Management LP221.9K$39M$7.97MAdded$3.58M
Logos Global Management LP200K$35.2MHeld
KLP KAPITALFORVALTNING AS191.7K$33.7MHeld
Freestone Grove Partners LP187.6K$33MHeld
PRINCIPAL FINANCIAL GROUP INC184.2K$32.4MHeld
ALLIANCEBERNSTEIN L.P.183.7K$32.3MHeld
Palo Alto Investors LP183.6K$32.3MHeld
LOS ANGELES CAPITAL MANAGEMENT LLC205.1K$30.7MHeld
Defilade Capital Management, L.P.162K$28.5MHeld
NOMURA HOLDINGS INC147.3K$25.9MHeld
BANCO BILBAO VIZCAYA ARGENTARIA, S.A.147K$25.9MHeld
Squarepoint Ops LLC146.4K$25.8MHeld
FRANKLIN RESOURCES INC141.4K$24.9MHeld
Aberdeen Group plc139.9K$24.6MHeld
IEQ CAPITAL, LLC139.6K$24.6MHeld
CANADA PENSION PLAN INVESTMENT BOARD138.1K$24.3MHeld
TD Asset Management Inc135.4K$23.8MHeld
Y-Intercept (Hong Kong) Ltd134.6K$23.7MHeld
SUVRETTA CAPITAL MANAGEMENT, LLC132.3K$23.3MHeld
AMERIPRISE FINANCIAL INC131.8K$23.2MHeld
FEDERATED HERMES, INC.131.2K$23.1MHeld
Eurizon Capital SGR S.p.A.130.8K$23MHeld
LETKO, BROSSEAU & ASSOCIATES INC129.8K$22.8MHeld
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM125.8K$22.1MHeld
AVIVA PLC124.9K$22MHeld
Universal- Beteiligungs- und Servicegesellschaft mbH123.7K$21.8MHeld
PERCEPTIVE ADVISORS LLC124K$21.8MHeld
WELLS FARGO & COMPANY/MN119.3K$21MHeld
Russell Investments Group, Ltd.119.1K$21MHeld
BRAIDWELL LP115.7K$20.4MHeld
BANK OF MONTREAL /CAN/113.7K$20MHeld
O'SHAUGHNESSY ASSET MANAGEMENT, LLC110.3K$19.4MHeld
Schonfeld Strategic Advisors LLC107.1K$18.8MHeld
Susquehanna Portfolio Strategies, LLC106.1K$18.7MHeld
MANUFACTURERS LIFE INSURANCE COMPANY, THE105.7K$18.6MHeld
Woodline Partners LP102.3K$18MHeld
Integral Health Asset Management, LLC100K$17.6MHeld
NEW YORK STATE COMMON RETIREMENT FUND99.2K$17.5MHeld
Quantinno Capital Management LP98.3K$17.3MHeld
NATIONAL BANK OF CANADA /FI/96.5K$17MHeld
Walleye Trading LLC95.5K$16.8MHeld
SPHERA FUNDS MANAGEMENT LTD.94.7K$16.7MHeld
Rhenman & Partners Asset Management AB92.3K$16.3MHeld
Creative Planning90K$15.8MHeld
LPL Financial LLC89.5K$15.8MHeld
AMERICAN CENTURY COMPANIES INC85.8K$15.1MHeld
SECTOR GAMMA AS85.5K$15MHeld
Portolan Capital Management, LLC85K$15MHeld
RAYMOND JAMES FINANCIAL INC83.7K$14.7MHeld
Illinois Municipal Retirement Fund81.4K$14.3MHeld
APG Asset Management N.V.95.1K$14.2MHeld
Eversept Partners, LP77.9K$13.7MHeld
CREDIT AGRICOLE S A76.8K$13.5MHeld
Cresset Asset Management, LLC76.4K$13.4M$2.74MAdded$929.7K
STATE OF WISCONSIN INVESTMENT BOARD75.9K$13.4MHeld
SILVERARC CAPITAL MANAGEMENT, LLC75.4K$13.3MHeld
Chevy Chase Trust Holdings, LLC74.7K$13.2MHeld
Privium Fund Management B.V.73.5K$12.9MHeld
State of Tennessee, Department of Treasury71.5K$12.9MHeld
BANQUE PICTET & CIE SA71.4K$12.6MHeld
MACKENZIE FINANCIAL CORP71.1K$12.5MHeld
Brevan Howard Capital Management LP71K$12.5MHeld
Cerity Partners LLC68.4K$12MHeld
Asset Management One Co., Ltd.67.5K$11.9MHeld
NOMURA ASSET MANAGEMENT CO LTD67.4K$11.9MHeld
EDMOND DE ROTHSCHILD HOLDING S.A.67K$11.8MHeld
Mitsubishi UFJ Trust & Banking Corp65.3K$11.5MHeld
Contrarius Group Holdings Ltd65K$11.4MHeld
ROYAL LONDON ASSET MANAGEMENT LTD64.6K$11.4MHeld
VOYA INVESTMENT MANAGEMENT LLC62.7K$11MHeld
OSSIAM62.3K$11MHeld
SEI INVESTMENTS CO59.5K$10.5MHeld
ENVESTNET ASSET MANAGEMENT INC58.8K$10.4MHeld
Empowered Funds, LLC58K$10.2MHeld
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.57.8K$10.2MHeld
SCHRODER INVESTMENT MANAGEMENT GROUP57.3K$10.1MHeld
Weiss Asset Management LP55.6K$9.78MNew
Korea Investment CORP53.9K$9.49MHeld
D. E. Shaw & Co., Inc.53.8K$9.46MHeld
Caption Management, LLC53K$9.33MHeld
Mariner, LLC52.5K$9.24MHeld
Cinctive Capital Management LP52.2K$9.18MHeld
STIFEL FINANCIAL CORP51.2K$9.02MHeld
TORONTO DOMINION BANK49.2K$8.65MHeld
Erste Asset Management GmbH48.7K$8.62MHeld
State of New Jersey Common Pension Fund D48.9K$8.61MHeld
Lansforsakringar Fondforvaltning AB (publ)48.7K$8.58MHeld
Ethic Inc.48.6K$8.55MHeld
Rafferty Asset Management, LLC48.6K$8.55MHeld
DANSKE BANK A/S48.4K$8.52M$2.44MAdded$1.56M
GATEWAY INVESTMENT ADVISERS LLC48.2K$8.48MHeld
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO47.4K$8.34MHeld
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.46.3K$8.15MHeld
LAZARD ASSET MANAGEMENT LLC46.1K$8.12MHeld
Dakota Wealth Management45.9K$8.08MHeld
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP45.3K$7.98MHeld
Resona Asset Management Co.,Ltd.45.2K$7.96MHeld
ADAMS DIVERSIFIED EQUITY FUND, INC.44.3K$7.8MHeld
Generali Investments CEE, investicni spolecnost, a.s.43.6K$7.66MHeld
STATE OF MICHIGAN RETIREMENT SYSTEM43.1K$7.59MHeld
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND42.7K$7.52MHeld
MERCER GLOBAL ADVISORS INC /ADV42.5K$7.45MHeld
ProShare Advisors LLC41.5K$7.3MHeld
Corient Private Wealth LLC41.1K$7.25MHeld
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC37.9K$7.2MHeld
Citadel40.4K$7.11MHeld
ARIZONA STATE RETIREMENT SYSTEM40.2K$7.08MHeld
Orion Investment Co39.4K$6.93MHeld
PNC Financial Services Group, Inc.38.7K$6.81MHeld
Czech National Bank38.7K$6.81MHeld
Vanguard Personalized Indexing Management, LLC38.6K$6.79MHeld
NISA INVESTMENT ADVISORS, LLC38.4K$6.76MHeld
BRIDGER MANAGEMENT, LLC36.1K$6.35MHeld
Calamos Advisors LLC35.5K$6.25MHeld
Parkman Healthcare Partners LLC35.4K$6.23MHeld
MetLife Investment Management, LLC35.2K$6.19MHeld
Mirae Asset Global Investments Co., Ltd.35.1K$6.18MHeld
TANG CAPITAL MANAGEMENT LLC35K$6.16MHeld
CIBC Asset Management Inc34.4K$6.06MHeld
OVERSEA-CHINESE BANKING Corp Ltd34.4K$6.05MHeld
USS Investment Management Ltd34.2K$6.02MHeld
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS34.1K$6.01MHeld
GRIMES & Co WEALTH MANAGEMENT, LLC33.8K$5.96MHeld
NorthCrest Asset Manangement, LLC33.8K$5.9MHeld
AMF Tjanstepension AB33.5K$5.89MHeld
MEITAV INVESTMENT HOUSE LTD33.5K$5.89MHeld
FARMERS TRUST CO33.2K$5.84MHeld
LEUTHOLD GROUP, LLC32.6K$5.74MHeld
CWA Asset Management Group, LLC32.5K$5.73MHeld
Jefferies Financial Group Inc.32.5K$5.72MHeld
Baader Bank Aktiengesellschaft32.5K$5.71MHeld
Impax Asset Management Group plc32.1K$5.65MHeld
Retirement Systems of Alabama31.2K$5.49MHeld
SIMPLEX TRADING, LLC30.9K$5.43MHeld
Hillman Capital Management, Inc.30.5K$5.37MHeld
Tidal Investments LLC30.5K$5.36MHeld
B. Metzler seel. Sohn & Co. AG30K$5.27MHeld
NATIXIS29.1K$5.12MHeld
Insight Wealth Strategies, LLC29K$5.1MHeld
Skandinaviska Enskilda Banken AB (publ)28.7K$5.06MHeld
DNB Asset Management AS28.7K$5.06MHeld
RITHOLTZ WEALTH MANAGEMENT28.4K$4.99MHeld
Leonteq Securities AG28K$4.92M$830.1KAdded$1.68M
FORSTA AP-FONDEN27.3K$4.8MHeld
Generali Asset Management SPA SGR27.2K$4.78MHeld
US BANCORP \DE\26.8K$4.71MHeld
FJARDE AP-FONDEN /FOURTH SWEDISH NATIONAL PENSION FUND26.6K$4.67MHeld
Nippon Life Global Investors Americas, Inc.26.5K$4.66MHeld
MACQUARIE GROUP LTD26.4K$4.65MHeld
NISSAY ASSET MANAGEMENT CORP /JAPAN26.3K$4.63MHeld
Mubadala Investment Co PJSC26.2K$4.62MHeld
BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp26K$4.57MHeld
Swiss Life Asset Management Ltd25.2K$4.43M$904.8KCut−$1.23M
DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main24.9K$4.39M−$444.6KCut−$10.4M
ADAR1 Capital Management, LLC24.3K$4.28MHeld
GUGGENHEIM CAPITAL LLC24K$4.23MHeld
Utah Retirement Systems24K$4.22MHeld
China Universal Asset Management Co., Ltd.23.9K$4.21MHeld
Old North State Wealth Management, LLC23.8K$4.19MHeld
JANE STREET GROUP, LLC23.5K$4.14MHeld
Cetera Investment Advisers23.5K$4.14MHeld
TEACHER RETIREMENT SYSTEM OF TEXAS23.5K$4.13MHeld
Caprock Group, LLC23.5K$4.13MHeld
XPONANCE LLC23K$4.05MHeld
BANK OF NOVA SCOTIA22.7K$3.99MHeld
Police & Firemen's Retirement System of New Jersey22.4K$3.94MHeld
NLB Skladi, upravljanje premozenja, d.o.o.22K$3.87MHeld
Atom Investors LP21.7K$3.82MHeld
NEW YORK LIFE INVESTMENT MANAGEMENT LLC21.3K$3.75MHeld
Capula Management Ltd21.3K$3.75MHeld
Kovitz Investment Group Partners, LLC21.1K$3.72MHeld
NewEdge Advisors, LLC21K$3.7MHeld
Sumitomo Mitsui DS Asset Management Company, Ltd20.4K$3.59MHeld
CIBC WORLD MARKETS CORP20.4K$3.59MHeld
JANUS HENDERSON GROUP PLC20.3K$3.56MHeld
INSPIRE TRUST CO, N.A.20K$3.52MHeld
COMERICA BANK19.5K$3.43MHeld
Rakuten Investment Management, Inc.19.3K$3.41MHeld
PUBLIC SECTOR PENSION INVESTMENT BOARD19.2K$3.38MHeld

Who left

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.