AI Holders Summary · Q2 2026

225 institutions reported IRON in Q2 2026. FMR LLC leads at 16.8% of the visible book.

Top holders

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

Hide index funds / market makers / custodians(4 on this page)

#HolderValueShares% port.Quarter

FMR LLC

CIK 0000315066

$358M4.9M0.02%Q2 2026 02

BlackRock, Inc.

CIK 0002012383

$181M2.5M0.00%Q2 2026 03

RA CAPITAL MANAGEMENT, L.P.

CIK 0001346824

$179M2.5M1.56%Q2 2026 04

JPMORGAN CHASE & CO

CIK 0000019617

$140M1.9M0.01%Q2 2026 05

WELLINGTON MANAGEMENT GROUP LLP

CIK 0000902219

$127M1.7M0.02%Q2 2026 06

STATE STREET CORP

CIK 0000093751

$121M1.6M0.00%Q2 2026 07

Atlas Venture Life Science Advisors, LLC

CIK 0001917529

$111M1.5M12.56%Q2 2026 08

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$100M1.4M0.00%Q2 2026 09

Frazier Life Sciences Management, L.P.

CIK 0001892134

$99M1.4M2.16%Q2 2026 10

PRICE T ROWE ASSOCIATES INC /MD/

CIK 0000080255

$99M1.5M0.01%Q1 2026 11

TCG Crossover Management, LLC

CIK 0001839948

$98M1.3M2.36%Q2 2026 12

Woodline Partners LP

CIK 0001784547

$70M958K0.22%Q2 2026 13

Siren, L.L.C.

CIK 0002005245

$65M888K1.31%Q2 2026 14

Logos Global Management LP

CIK 0001792126

$64M875K2.75%Q2 2026 15

Opaleye Management Inc.

CIK 0001595855

$63M855K5.66%Q2 2026 16

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$58M790K0.00%Q2 2026 17

Assenagon Asset Management S.A.

CIK 0001546007· Quasi-passive

$56M768K0.04%Q2 2026 18

BVF INC/IL

CIK 0001056807

$52M650K1.74%Q4 2025 19

Vestal Point Capital, LP

CIK 0001974915

$45M700K1.25%Q1 2026 20

DIMENSIONAL FUND ADVISORS LP

CIK 0000354204· Quasi-passive

$42M569K0.01%Q2 2026

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