AI Holders Summary · Q1 2026

209 institutions reported ANAB in Q1 2026. EcoR1 Capital, LLC leads at 36.8% 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

EcoR1 Capital, LLC

CIK 0001587114

$437M7.9M18.55%Q1 2026 02

BlackRock, Inc.

CIK 0002012383

$93M1.7M0.00%Q1 2026 03

TANG CAPITAL MANAGEMENT LLC

CIK 0001232621

$74M1.3M3.75%Q1 2026 04

MORGAN STANLEY

CIK 0000895421

$55M994K0.00%Q1 2026 05

STATE STREET CORP

CIK 0000093751

$55M992K0.00%Q1 2026 06

Affinity Asset Advisors, LLC

CIK 0001773195

$52M940K2.69%Q1 2026 07

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$47M853K0.00%Q1 2026 08

Palo Alto Investors LP

CIK 0001306923

$35M638K5.41%Q1 2026 09

D. E. Shaw & Co., Inc.

CIK 0001009207

$32M670K0.02%Q4 2025 10

683 Capital Management, LLC

CIK 0001404574

$31M648K1.37%Q4 2025 11

First Light Asset Management, LLC

CIK 0001600004

$31M565K2.81%Q1 2026 12

Sanofi

CIK 0001121404

$30M822K9.04%Q1 2026 13

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$29M520K0.00%Q1 2026 14

Vanguard Portfolio Management

CIK 0002100121· Index

$29M520K0.00%Q1 2026 15

BANK OF AMERICA CORP /DE/

CIK 0000070858

$28M501K0.00%Q1 2026 16

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

CIK 0001164508

$27M492K0.01%Q1 2026 17

MILLENNIUM MANAGEMENT LLC

CIK 0001273087

$26M476K0.01%Q1 2026 18

FMR LLC

CIK 0000315066

$26M473K0.00%Q1 2026 19

TWO SIGMA INVESTMENTS, LP

CIK 0001179392

$26M465K0.02%Q1 2026 20

FEDERATED HERMES, INC.

CIK 0001056288

$20M364K0.03%Q1 2026

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