AI Holders Summary · Q1 2026

125 institutions reported JBIO in Q1 2026. FMR LLC leads at 15.7% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

Hide index funds / market makers / custodians(2 on this page)

#HolderValueShares% port.Quarter

FMR LLC

CIK 0000315066

$100M7.1M0.01%Q1 2026 02

Fairmount Funds Management LLC

CIK 0001802528

$64M4.6M4.62%Q1 2026 03

Avidity Partners Management LP

CIK 0001791827

$54M2.8M5.76%Q1 2026 04

RA CAPITAL MANAGEMENT, L.P.

CIK 0001346824

$52M3.7M0.55%Q1 2026 05

Bellevue Group AG

CIK 0001674546

$52M3.3M0.98%Q4 2025 06

VR Adviser, LLC

CIK 0001615982

$50M3.2M2.45%Q4 2025 07

JANUS HENDERSON GROUP PLC

CIK 0001274173

$44M3.1M0.02%Q1 2026 08

BlackRock, Inc.

CIK 0002012383

$33M2.3M0.00%Q1 2026 09

BAKER BROS. ADVISORS LP

CIK 0001263508

$25M1.6M0.15%Q4 2025 10

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$25M1.8M0.00%Q1 2026 11

Remedium Capital Partners, LLC

CIK 0002104501

$22M1.6M7.88%Q1 2026 12

Versant Venture Management, LLC

CIK 0001560009

$21M1.5M15.16%Q1 2026 13

Samsara BioCapital, LLC

CIK 0001744967

$14M969K1.32%Q1 2026 14

MARSHALL WACE, LLP

CIK 0001318757

$14M875K0.01%Q4 2025 15

GREAT POINT PARTNERS LLC

CIK 0001281446

$12M806K4.03%Q4 2025 16

Aberdeen Group plc

CIK 0001716774

$12M867K0.02%Q1 2026 17

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$12M823K0.00%Q1 2026 18

Soleus Capital Management, L.P.

CIK 0001802630

$11M797K0.45%Q1 2026 19

ACORN CAPITAL ADVISORS, LLC

CIK 0002054410

$11M787K3.14%Q1 2026 20

STATE STREET CORP

CIK 0000093751

$9M656K0.00%Q1 2026

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