13F

Stock

Biogen Inc.

BIIB · held by 997 managers

Reported value

$23.7B

Holders

997

+111 new · −107 exited

Holders’ est. mark

$793.7M

Price effect on 232 books still in the name

Largest holder

$2.93B

BlackRock, Inc.

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
BlackRock, Inc.16M$2.93B$108.7MAdded$322M
PRIMECAP MANAGEMENT CO/CA/14.8M$2.71B$108.3MAdded$108.3M
Fidelity12.8M$2.35B$69.2MAdded$689.1M
VANGUARD CAPITAL MANAGEMENT LLC9.54M$1.75BHeld
State Street7.17M$1.31B$52.5MAdded$54.2M
VANGUARD PORTFOLIO MANAGEMENT LLC6.53M$1.2BHeld
GEODE CAPITAL MANAGEMENT, LLC4.34M$793.4M$30.8MAdded$57M
WELLINGTON MANAGEMENT GROUP LLP2.96M$543M$21.7MCut−$82M
MORGAN STANLEY2.17M$398M$15.9MCut−$11.2M
JPMORGAN CHASE & CO2.02M$378.1M$21.5MAdded$51.3M
Icahn Capital1.92M$346.2M$6.13MAdded$77.2M
Invesco Ltd.1.75M$320M$12.2MAdded$28.6M
Boston Partners1.7M$311.7M$12.5MAdded$8.84M
NORTHERN TRUST CORP1.45M$265.2M$10.6MAdded$10.7M
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC1.38M$252.5M$10.1MAdded$7.68M
Legal & General Group Plc1.35M$247.5M$9.91MCut−$9.41M
BANK OF AMERICA CORP /DE/1.16M$212M$8.29MAdded$13.3M
CHARLES SCHWAB INVESTMENT MANAGEMENT INC1.15M$210.7M$8.4MAdded$9.4M
DIMENSIONAL FUND ADVISORS LP1.08M$197.9M$7.09MAdded$28.8M
DEUTSCHE BANK AG\1.06M$195M$7MAdded$27.2M
GOLDMAN SACHS GROUP INC1.05M$192.7M$7.72MCut−$780.4K
Pictet Asset Management Holding SA913.3K$168.3M$7.39MAdded$1.37M
VANGUARD FIDUCIARY TRUST CO825.5K$151.3MHeld
Point72 Asset Management, L.P.809.6K$148.4M$5.94MCut−$346.7M
Alyeska Investment Group, L.P.805K$147.6M$5.91MCut−$32.7M
Amundi790.8K$145M$4.2MAdded$44.2M
Bank of New York Mellon Corp788.5K$144.6M$5.79MAdded$1.81M
Robeco Institutional Asset Management B.V.763.2K$139.9M$4.48MAdded$32.4M
FRED ALGER MANAGEMENT, LLC733.2K$134.4M$5.38MCut−$6.16M
MASSACHUSETTS FINANCIAL SERVICES CO /MA/720.6K$133.7M$6.8MAdded$8.3M
Employees Provident Fund Board704.2K$129.1M$5.17MAdded$5.17M
FIRST TRUST ADVISORS LP674K$123.6M$4.15MAdded$24M
Balyasny Asset Management L.P.650K$119.2M$4.46MAdded$12.2M
AustralianSuper Pty Ltd616.2K$113M$3.5MAdded$29.1M
Artemis Investment Management LLP571.6K$104.8M$1.67MAdded$64.9M
BARCLAYS PLC551.5K$101.1M$4.05MCut−$128.6M
ROYAL BANK OF CANADA531.4K$97.4M$3.9MAdded$2.06M
UBS Group AG523.5K$96M$3.84MCut−$17M
Zurcher Kantonalbank (Zurich Cantonalbank)522.2K$95.7M$3.32MAdded$16.1M
Caisse de depot et placement du Quebec518.7K$95.1M$3.81MCut−$8.49M
CITIGROUP INC500.5K$91.8M$3.67MCut−$9.23M
BNP PARIBAS FINANCIAL MARKETS471.1K$86.4M$3.46MCut−$3.05M
HSBC HOLDINGS PLC463.7K$84.6M$2.87MCut−$4.22M
Swiss National Bank430.6K$78.9M$2.95MAdded$8.23M
National Pension Service401.7K$73.6M$2.11MAdded$23.1M
Candriam S.C.A.381.8K$70M$2.42MAdded$11.8M
Patient Capital Management, LLC379.7K$69.6M$2.79MCut−$31.8M
Nuveen, LLC358.8K$65.8M$2.63MCut−$308.5K
Sumitomo Mitsui Trust Group, Inc.356.3K$65.3M$2.62MAdded$92.2K
Vanguard Global Advisers, LLC343.8K$63MHeld
California Public Employees Retirement System340.9K$62.5M$2.43MAdded$4.28M
Mitsubishi UFJ Asset Management Co., Ltd.334.4K$61.3M$1.76MAdded$4.42M
ADAGE CAPITAL PARTNERS GP, L.L.C.333.5K$61.1M$2.16MAdded$9.33M
VICTORY CAPITAL MANAGEMENT INC320.8K$58.8M$1.81MAdded$15.4M
Man Group plc318.7K$58.4M$2.34MCut−$1.28M
FIL Ltd318.1K$58.3M$2.33MAdded$2.07M
Fisher Asset Management, LLC312.6K$57.3M$2.15MAdded$5.7M
Gotham Asset Management, LLC298.4K$54.7M$2.03MAdded$6M
Swedbank AB289.8K$53.1M$1.7MAdded$12.4M
CAUSEWAY CAPITAL MANAGEMENT LLC280.8K$51.5M$2.06MCut−$40.2M
RHUMBLINE ADVISERS275.4K$50.5M$1.99MAdded$2.67M
AEGON ASSET MANAGEMENT UK Plc258.7K$47.4M$1.88MAdded$1.63M
VANGUARD ASSET MANAGEMENT, Ltd249.8K$45.8MHeld
MARSHALL WACE, LLP229.9K$42.1M$1.69MCut−$25.8M
Sofinnova Investments, Inc.229.5K$42.1MNew
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM220.7K$40.5M$1.62MAdded$617.9K
BNP PARIBAS ASSET MANAGEMENT Holding S.A.215.4K$39.5M$39.5MAdded$39.5M
Qube Research & Technologies Ltd212.9K$39MNew
ALLIANCEBERNSTEIN L.P.212.9K$37.5M−$0Added$5.13M
Renaissance Technologies203.4K$37.3M$1.49MCut−$33M
Hudson Bay Capital Management LP201.4K$36.9M$1.48MCut−$2.13M
Logos Global Management LP200K$36.7M$1.47MAdded$1.47M
KLP KAPITALFORVALTNING AS199.2K$36.5M$1.41MAdded$2.78M
PRINCIPAL FINANCIAL GROUP INC187.1K$34.3M$1.35MAdded$1.88M
Allianz Asset Management GmbH178K$32.6M$1.31MCut−$11M
PRUDENTIAL FINANCIAL INC163.9K$30M$1.2MCut−$32.2M
IEQ CAPITAL, LLC152.1K$27.9M$1.02MAdded$3.31M
ExodusPoint Capital Management, LP152K$27.9MNew
Aberdeen Group plc151.1K$27.7M$1.03MAdded$3.09M
LETKO, BROSSEAU & ASSOCIATES INC150.9K$27.7M$952.6KAdded$4.82M
FRANKLIN RESOURCES INC144.4K$26.5M$1.04MAdded$1.6M
PANAGORA ASSET MANAGEMENT INC142.1K$26M$23.5KAdded$25.5M
O'SHAUGHNESSY ASSET MANAGEMENT, LLC141.3K$25.9M$809.4KAdded$6.5M
Palo Alto Investors LP140.7K$25.8M$1.03MCut−$6.51M
SUSQUEHANNA INTERNATIONAL GROUP, LLP140.3K$25.7M$1.03MCut−$90.7M
Citadel138.1K$25.3M$296.7KAdded$18.2M
Russell Investments Group, Ltd.135.8K$25.1M$1.02MAdded$4.11M
AMERIPRISE FINANCIAL INC132.6K$24.3M$967.9KAdded$1.12M
Eurizon Capital SGR S.p.A.129.2K$23.7M$1.01MAdded$724.2K
TD Asset Management Inc127.3K$23.3M$934.1KCut−$488.6K
WELLS FARGO & COMPANY/MN127.1K$23.3M$875.9KAdded$2.31M
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM124.2K$22.8M$911.7KAdded$641K
Portolan Capital Management, LLC118.5K$21.7M$623.8KAdded$6.76M
Creative Planning117.2K$21.5M$660.8KAdded$5.65M
Quantinno Capital Management LP116.4K$21.3M$721.7KAdded$4.03M
LMR Partners LLP116.1K$21.3M$63.3KAdded$19.8M
CANADA PENSION PLAN INVESTMENT BOARD114.9K$21.1M$843.6KCut−$3.23M
Susquehanna Portfolio Strategies, LLC111.8K$20.5M$778.9KAdded$1.83M
Rhenman & Partners Asset Management AB109.1K$20M$677.8KAdded$3.75M
Woodline Partners LP109K$20M$751KAdded$1.98M
AMERICAN CENTURY COMPANIES INC104.8K$19.2M$629.9KAdded$4.11M
ADAMS DIVERSIFIED EQUITY FUND, INC.100.3K$18.4M$325.2KAdded$10.6M
NEW YORK STATE COMMON RETIREMENT FUND99.8K$18.3M$728.5KAdded$838.5K
Walleye Trading LLC99.5K$18.2M$701.1KAdded$1.44M
FEDERATED HERMES, INC.97.3K$17.8M$714KCut−$5.25M
AVIVA PLC96.9K$17.8M$711KCut−$4.22M
RAYMOND JAMES FINANCIAL INC96.7K$17.7M$614.4KAdded$2.99M
Defilade Capital Management, L.P.96.3K$17.7M$706.8KCut−$10.9M
MANUFACTURERS LIFE INSURANCE COMPANY, THE95.1K$17.4M$689.8KCut−$1.18M
MILLENNIUM MANAGEMENT LLC94K$17.2M$689.7KCut−$180.9M
BANK OF MONTREAL /CAN/92.7K$17M$680.5KCut−$3.01M
SPHERA FUNDS MANAGEMENT LTD.92.5K$17M$679.1KAdded$289.9K
SECTOR GAMMA AS90.1K$16.5M$627.4KAdded$1.47M
Illinois Municipal Retirement Fund89.3K$16.4M$597.5KAdded$2.05M
LPL Financial LLC81.7K$15M$599.8KCut−$775.9K
NATIONAL BANK OF CANADA /FI/78.9K$14.5M$580.1KCut−$2.53M
STATE OF WISCONSIN INVESTMENT BOARD78.6K$14.4M$557.4KAdded$1.04M
Cerity Partners LLC76.6K$14.1M$502.2KAdded$2.02M
Korea Investment CORP74K$13.6M$395.7KAdded$4.08M
Vanguard Investments Australia, Ltd.73.3K$13.4MHeld
APG Asset Management N.V.84K$13.4M$778.6KCut−$873.5K
Chevy Chase Trust Holdings, LLC72.6K$13.3M$533.2KAdded$167.3K
Mariner, LLC72K$13.2M$383.4KAdded$3.97M
SEI INVESTMENTS CO71.5K$13.1M$438KAdded$2.64M
MACKENZIE FINANCIAL CORP71.4K$13.1M$517.2KAdded$582.7K
Universal- Beteiligungs- und Servicegesellschaft mbH68.2K$12.6M$508.5KCut−$9.28M
Cresset Asset Management, LLC67.5K$12.4M$495.5KCut−$1.07M
BANQUE PICTET & CIE SA66.1K$12.1M$484.9KCut−$447.3K
Mitsubishi UFJ Trust & Banking Corp65.1K$11.9M$477.8KAdded$438.4K
ENVESTNET ASSET MANAGEMENT INC64.7K$11.9M$431.7KAdded$1.51M
ROYAL LONDON ASSET MANAGEMENT LTD64.3K$11.8M$471.7KAdded$419.1K
Asset Management One Co., Ltd.64.1K$11.8M$417.6KCut−$175.2K
NOMURA ASSET MANAGEMENT CO LTD63K$11.5M$462.3KCut−$307.3K
ORBIMED ADVISORS LLC61.6K$11.3MNew
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.60.8K$11.1M$430.5KAdded$969.8K
Integral Health Asset Management, LLC60K$11M$440.4KCut−$6.6M
Tidal Investments LLC58.6K$10.9M$283.7KAdded$5.49M
SCHRODER INVESTMENT MANAGEMENT GROUP58.8K$10.8M$420.4KAdded$705.6K
GLENVIEW CAPITAL MANAGEMENT, LLC57K$10.5M$418.5KCut−$40.7M
EDMOND DE ROTHSCHILD HOLDING S.A.57K$10.4M$418.2KCut−$1.34M
CWM, LLC55.2K$10.1M$8.95MAdded$10.1M
VOYA INVESTMENT MANAGEMENT LLC54.6K$10M$400.5KCut−$1.03M
Erste Asset Management GmbH53.1K$9.97M$523.4KAdded$1.35M
Andra AP-fonden52K$9.53M$18.4KAdded$9.09M
SILVERARC CAPITAL MANAGEMENT, LLC51K$9.34M$374.1KCut−$3.93M
GATEWAY INVESTMENT ADVISERS LLC50.9K$9.34M$353.5KAdded$859.9K
State of New Jersey Common Pension Fund D50.1K$9.19M$359.3KAdded$577.8K
HighTower Advisors, LLC49.9K$9.14M$87.9KAdded$7.03M
Schonfeld Strategic Advisors LLC48.8K$8.95M$358.4KCut−$9.89M
Lansforsakringar Fondforvaltning AB (publ)47.8K$8.76M$350.9KAdded$189.3K
DANSKE BANK A/S47.4K$8.69M$348KAdded$172.4K
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.47.3K$8.68M$340.9KAdded$523K
Ethic Inc.47.3K$8.67M$347.1KAdded$118.6K
Resona Asset Management Co.,Ltd.46.3K$8.52M$361.2KAdded$559.1K
Tredje AP-fonden46.4K$8.5MNew
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO46.1K$8.44M$338.1KAdded$107.9K
Dakota Wealth Management45.6K$8.36M$334.6KAdded$280.1K
CONTRAVISORY INVESTMENT MANAGEMENT, INC.44.7K$8.19MNew
Privium Fund Management B.V.43.8K$8.03M$321.5KCut−$4.9M
Generali Investments CEE, investicni spolecnost, a.s.43.6K$7.98M$319.7KAdded$319.7K
TORONTO DOMINION BANK43.4K$7.95M$318.3KCut−$702.8K
STATE OF MICHIGAN RETIREMENT SYSTEM43K$7.88M$315.6KAdded$298K
BANCO BILBAO VIZCAYA ARGENTARIA, S.A.42.5K$7.77M$295.3KCut−$18.1M
CIBC Bancorp USA Inc.41.9K$7.68MHeld
SEB Asset Management AB41.9K$7.68MHeld
OSSIAM41K$7.51M$300.6KCut−$3.45M
STIFEL FINANCIAL CORP40.9K$7.51M$300.4KCut−$1.51M
Mirae Asset Global Investments Co., Ltd.40.2K$7.38M$257.7KAdded$1.2M
Czech National Bank40K$7.33M$283.9KAdded$519.7K
ARIZONA STATE RETIREMENT SYSTEM39.9K$7.31M$292.6KAdded$229.8K
Orion Investment Co39.6K$7.26M$289.2KAdded$327K
PNC Financial Services Group, Inc.39.5K$7.24M$284.2KAdded$424.6K
FJARDE AP-FONDEN /FOURTH SWEDISH NATIONAL PENSION FUND39.3K$7.21M$194.9KAdded$2.53M
State of Tennessee, Department of Treasury39.3K$7.2M$135.1KCut−$5.66M
MERCER GLOBAL ADVISORS INC /ADV38.6K$7.08M$303.3KCut−$376.7K
IFM Investors Pty Ltd38.5K$7.06M$7.06MAdded$7.06M
OVERSEA-CHINESE BANKING Corp Ltd37.5K$6.87M$252.2KAdded$820.4K
USS Investment Management Ltd37.2K$6.82M$249.6KAdded$799.7K
Corient Private Wealth LLC37K$6.75M$240KCut−$499K
MARTINGALE ASSET MANAGEMENT L P36.7K$6.73MNew
Vanguard Personalized Indexing Management, LLC36.4K$6.68M$267.3KCut−$116.4K
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC62.5K$6.65M−$3.16MCut−$545.9K
Squarepoint Ops LLC36.1K$6.61M$264.6KCut−$19.2M
ProShare Advisors LLC35.9K$6.59M$263.7KCut−$716.6K
NISA INVESTMENT ADVISORS, LLC35.8K$6.57M$262.9KCut−$197.3K
Calamos Advisors LLC35.5K$6.51M$260.8KAdded$260.8K
LOS ANGELES CAPITAL MANAGEMENT LLC35.4K$6.48M$1.19MCut−$24.2M
Walleye Capital LLC35.3K$6.48M$11.6KAdded$6.2M
CIBC Asset Management Inc35.2K$6.45M$252.8KAdded$390.2K
Rafferty Asset Management, LLC35K$6.42M$257KCut−$2.13M
TANG CAPITAL MANAGEMENT LLC35K$6.42M$256.9KAdded$256.9K
RITHOLTZ WEALTH MANAGEMENT34.9K$6.41M$208.3KAdded$1.41M
CWA Asset Management Group, LLC34.8K$6.39M$238.8KAdded$659.7K
GRIMES & Co WEALTH MANAGEMENT, LLC34.7K$6.36M$248.4KAdded$402.4K
MetLife Investment Management, LLC34.3K$6.28M$251.6KAdded$97.4K
Generali Asset Management SPA SGR34.2K$6.27M$199.5KAdded$1.49M
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS34.2K$6.27M$250.5KAdded$261.8K
Ensign Peak Advisors, Inc33.7K$6.18M$78.4KAdded$4.3M
FARMERS TRUST CO33.6K$6.16M$243.6KAdded$321.5K
Nippon Life Global Investors Americas, Inc.33.6K$6.15M$194.4KAdded$1.49M
LEUTHOLD GROUP, LLC33.1K$6.08M$239.2KAdded$340.8K
QRG CAPITAL MANAGEMENT, INC.33K$6.05M$27.8KAdded$5.38M
FIFTH THIRD BANCORP32.7K$6M$67.6KAdded$4.38M
Lighthouse Investment Partners, LLC32.6K$5.98M$42.5KAdded$4.96M
Swiss Life Asset Management Ltd31.3K$5.74M$184.9KAdded$1.3M
US BANCORP \DE\31.2K$5.72M$196.4KAdded$1.02M
DNB Asset Management AS31.2K$5.72M$210.9KAdded$667.7K
Retirement Systems of Alabama31.2K$5.71M$228.8KAdded$221K
Baader Bank Aktiengesellschaft30.8K$5.64M$225KCut−$72.2K
NISSAY ASSET MANAGEMENT CORP /JAPAN29.8K$5.46M$192.9KAdded$830.2K
B. Metzler seel. Sohn & Co. AG29.7K$5.45M$218.2KAdded$174.9K
Hillman Capital Management, Inc.29.5K$5.42M$216.8KAdded$45.1K
Insight Wealth Strategies, LLC29.3K$5.38M$212.6KAdded$283.3K
Impax Asset Management Group plc28.7K$5.27M$210.9KCut−$386.8K
PEAK6 LLC28.2K$5.16MNew
Daiwa Securities Group Inc.27.1K$4.97M$4.81MAdded$4.97M
XPONANCE LLC26.5K$4.85M$169.1KAdded$795.7K
Leonteq Securities AG26.5K$4.85M$194.2KCut−$70.9K
GUGGENHEIM CAPITAL LLC26.4K$4.84M$176.3KAdded$609.3K
China Universal Asset Management Co., Ltd.26K$4.77M$175.5KAdded$567.6K
Caprock Group, LLC25.7K$4.7M$172.1KAdded$575.1K
Atom Investors LP24.7K$4.54M$159.4KAdded$714.7K
JONES FINANCIAL COMPANIES LLLP24.6K$4.51M$100.5KAdded$2.26M
Old North State Wealth Management, LLC24.6K$4.51M$174.8KAdded$318.9K
NorthCrest Asset Manangement, LLC25K$4.44M$67.8KCut−$1.46M
Munich Reinsurance Co Stock Corp in Munich23.9K$4.39MNew
PUBLIC SECTOR PENSION INVESTMENT BOARD23.8K$4.36M$140.9KAdded$984.5K
Utah Retirement Systems23.7K$4.35M$174.1KAdded$124.4K
CREDIT AGRICOLE S A23K$4.21M$168.7KCut−$9.3M
DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main22.9K$4.2M$162.5KCut−$188.2K
Leo Wealth, LLC22.7K$4.17M$133.1KAdded$977.1K
NATIXIS22.6K$4.14M$165.8KCut−$981.5K
Police & Firemen's Retirement System of New Jersey22.5K$4.12M$164.2KAdded$183.6K
Cetera Investment Advisers22.4K$4.11M$164.7KCut−$21.7K
Rakuten Investment Management, Inc.21.8K$4.08M$207.2KAdded$673K
NEW YORK LIFE INVESTMENT MANAGEMENT LLC21.9K$4.02M$156.4KAdded$265.5K
Jefferies Financial Group Inc.21.9K$4.02M$160.8KCut−$1.71M
Empowered Funds, LLC21.8K$3.99M$159.8KCut−$6.21M
SummitTX Capital, L.P.21.7K$3.97MNew
TEACHER RETIREMENT SYSTEM OF TEXAS21.3K$3.9M$156.3KCut−$229.1K
Focus Partners Wealth21K$3.85M$112.5KAdded$1.29M
MEITAV INVESTMENT HOUSE LTD21K$3.84M$153.9KCut−$2.04M
Kovitz Investment Group Partners, LLC20.9K$3.84M$153.7KAdded$119.7K
NEOS Investment Management LLC20.8K$3.82M$121.4KAdded$910.8K
Sumitomo Mitsui DS Asset Management Company, Ltd20.5K$3.76M$149.9KAdded$162.2K
BANK OF NOVA SCOTIA20.4K$3.75M$150KCut−$247.6K
BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp20.2K$3.71M$148.4KCut−$862.3K
OMERS ADMINISTRATION Corp20.1K$3.69M$123.4KAdded$735.9K
INSPIRE TRUST CO, N.A.20K$3.67M$146.8KAdded$146.8K
Federation des caisses Desjardins du Quebec19.6K$3.59M$91.9KAdded$1.42M

Who left

Positions as of Q1 2026. 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.