AI Holders Summary · Q1 2026

220 institutions reported IRON in Q1 2026. FMR LLC leads at 18.6% 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

$357M5.6M0.02%Q1 2026 02

BlackRock, Inc.

CIK 0002012383

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

RA CAPITAL MANAGEMENT, L.P.

CIK 0001346824

$157M2.5M1.66%Q1 2026 04

STATE STREET CORP

CIK 0000093751

$121M1.6M0.00%Q2 2026 05

WELLINGTON MANAGEMENT GROUP LLP

CIK 0000902219

$111M1.7M0.02%Q1 2026 06

PRICE T ROWE ASSOCIATES INC /MD/

CIK 0000080255

$99M1.5M0.01%Q1 2026 07

Atlas Venture Life Science Advisors, LLC

CIK 0001917529

$97M1.5M12.25%Q1 2026 08

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$88M1.4M0.00%Q1 2026 09

Frazier Life Sciences Management, L.P.

CIK 0001892134

$87M1.4M2.23%Q1 2026 10

TCG Crossover Management, LLC

CIK 0001839948

$86M1.3M2.45%Q1 2026 11

JPMORGAN CHASE & CO

CIK 0000019617

$83M1.4M0.01%Q1 2026 12

ORBIMED ADVISORS LLC

CIK 0001055951

$68M1.1M1.36%Q1 2026 13

Siren, L.L.C.

CIK 0002005245

$63M988K1.75%Q1 2026 14

Woodline Partners LP

CIK 0001784547

$61M958K0.23%Q1 2026 15

BVF INC/IL

CIK 0001056807

$52M650K1.74%Q4 2025 16

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$48M744K0.00%Q1 2026 17

Vestal Point Capital, LP

CIK 0001974915

$45M700K1.25%Q1 2026 18

GOLDMAN SACHS GROUP INC

CIK 0000886982

$41M640K0.00%Q1 2026 19

DEERFIELD MANAGEMENT COMPANY, L.P.

CIK 0001009258

$41M511K0.52%Q4 2025 20

Logos Global Management LP

CIK 0001792126

$36M560K1.79%Q1 2026

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