AI Holders Summary · Q1 2026

93 institutions reported PEPG in Q1 2026. RA CAPITAL MANAGEMENT, L.P. leads at 34.3% 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

RA CAPITAL MANAGEMENT, L.P.

CIK 0001346824

$36M20.1M0.38%Q1 2026 02

BVF INC/IL

CIK 0001056807

$12M1.9M0.42%Q4 2025 03

Commodore Capital LP

CIK 0001831942

$8M4.5M0.46%Q1 2026 04

VIKING GLOBAL INVESTORS LP

CIK 0001103804

$6M3.5M0.02%Q1 2026 05

Laurion Capital Management LP

CIK 0001390202

$5M2.8M0.13%Q2 2026 06

Vivo Capital, LLC

CIK 0001674712

$4M2.3M0.34%Q1 2026 07

MILLENNIUM MANAGEMENT LLC

CIK 0001273087

$4M2.1M0.00%Q1 2026 08

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$3M1.9M0.00%Q2 2026 09

AWM Investment Company, Inc.

CIK 0001535264

$3M1.8M0.36%Q1 2026 10

Kalehua Capital Management LLC

CIK 0002106181

$3M1.7M1.18%Q1 2026 11

ADAR1 Capital Management, LLC

CIK 0001940272

$3M1.6M0.17%Q1 2026 12

RENAISSANCE TECHNOLOGIES LLC

CIK 0001037389

$3M1.5M0.00%Q2 2026 13

BlackRock, Inc.

CIK 0002012383

$2M1.3M0.00%Q2 2026 14

Woodline Partners LP

CIK 0001784547

$2M1.3M0.01%Q1 2026 15

CITADEL ADVISORS LLC

CIK 0001423053

$2M286K0.00%Q4 2025 16

SUSQUEHANNA INTERNATIONAL GROUP, LLP

CIK 0001446194· Market maker

$2M887K0.00%Q1 2026 17

MARSHALL WACE, LLP

CIK 0001318757

$2M867K0.00%Q2 2026 18

Ikarian Capital, LLC

CIK 0001778253

$1M747K0.11%Q1 2026 19

Qube Research & Technologies Ltd

CIK 0001729829

$1M706K0.00%Q1 2026 20

683 Capital Management, LLC

CIK 0001404574

$1M187K0.05%Q4 2025

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