AI Holders Summary · Q2 2026

101 institutions reported ABOS in Q2 2026. RA CAPITAL MANAGEMENT, L.P. leads at 46.5% 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

RA CAPITAL MANAGEMENT, L.P.

CIK 0001346824

$56M21.0M0.49%Q2 2026 02

Sands Capital Alternatives, LLC

CIK 0001846444

$10M3.7M1.62%Q2 2026 03

BlackRock, Inc.

CIK 0002012383

$7M2.5M0.00%Q2 2026 04

Alyeska Investment Group, L.P.

CIK 0001453072

$7M2.5M0.02%Q2 2026 05

FRANKLIN RESOURCES INC

CIK 0000038777

$6M2.3M0.00%Q2 2026 06

ADAR1 Capital Management, LLC

CIK 0001940272

$6M2.1M0.26%Q2 2026 07

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$4M1.7M0.00%Q2 2026 08

Knollwood Investment Advisory, LLC

CIK 0001999346

$4M1.6M0.39%Q2 2026 09

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$3M1.1M0.00%Q2 2026 10

Hudson Bay Capital Management LP

CIK 0001393825

$3M955K0.01%Q2 2026 11

Ikarian Capital, LLC

CIK 0001778253

$2M1.1M0.20%Q1 2026 12

Pathstone Holdings, LLC

CIK 0002011612

$2M859K0.01%Q2 2026 13

RENAISSANCE TECHNOLOGIES LLC

CIK 0001037389

$2M675K0.00%Q2 2026 14

SG Americas Securities, LLC

CIK 0001313360

$2M719K0.00%Q1 2026 15

TWO SIGMA INVESTMENTS, LP

CIK 0001179392

$2M623K0.00%Q2 2026 16

STATE STREET CORP

CIK 0000093751

$2M601K0.00%Q2 2026 17

NORTHERN TRUST CORP

CIK 0000073124· Index

$963K361K0.00%Q2 2026 18

TWO SIGMA ADVISERS, LP

CIK 0001478735

$890K422K0.00%Q4 2025 19

Vanguard Portfolio Management

CIK 0002100121· Index

$857K321K0.00%Q2 2026 20

CITADEL ADVISORS LLC

CIK 0001423053

$785K372K0.00%Q4 2025

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