AI Holders Summary · Q2 2026

337 institutions reported RARE in Q2 2026. BlackRock, Inc. leads at 15.3% of the visible book.

Top holders

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

Hide index funds / market makers / custodians(3 on this page)

#HolderValueShares% port.Quarter

BlackRock, Inc.

CIK 0002012383

$356M10.7M0.01%Q2 2026 02

RTW INVESTMENTS, LP

CIK 0001493215

$260M7.8M2.22%Q2 2026 03

Vanguard Portfolio Management

CIK 0002100121· Index

$227M6.8M0.01%Q2 2026 04

AQR CAPITAL MANAGEMENT LLC

CIK 0001167557

$214M6.6M0.07%Q2 2026 05

STATE STREET CORP

CIK 0000093751

$206M6.2M0.01%Q2 2026 06

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$143M4.3M0.00%Q2 2026 07

TWO SIGMA INVESTMENTS, LP

CIK 0001179392

$121M3.6M0.09%Q2 2026 08

SANDS CAPITAL MANAGEMENT, LLC

CIK 0001020066

$105M3.2M0.39%Q2 2026 09

FRONTIER CAPITAL MANAGEMENT CO LLC

CIK 0000351173

$95M2.8M0.89%Q2 2026 10

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$86M2.6M0.00%Q2 2026 11

Sofinnova Investments, Inc.

CIK 0001631134

$74M2.2M3.83%Q2 2026 12

Bellevue Group AG

CIK 0001674546

$66M2.0M1.39%Q2 2026 13

BAKER BROS. ADVISORS LP

CIK 0001263508

$64M2.8M0.37%Q4 2025 14

ADAGE CAPITAL PARTNERS GP, L.L.C.

CIK 0001165408

$53M1.6M0.07%Q2 2026 15

MPM BioImpact LLC

CIK 0001687078

$47M1.4M2.89%Q2 2026 16

MORGAN STANLEY

CIK 0000895421

$44M1.3M0.00%Q2 2026 17

Caption Management, LLC

CIK 0001706766

$42M1.3M0.20%Q2 2026 18

WELLINGTON MANAGEMENT GROUP LLP

CIK 0000902219

$42M1.3M0.01%Q2 2026 19

BANK OF AMERICA CORP /DE/

CIK 0000070858

$38M1.1M0.00%Q2 2026 20

GW&K Investment Management, LLC

CIK 0001082917

$34M1.6M0.30%Q1 2026

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