AI Holders Summary · Q1 2026

70 institutions reported AKTS in Q1 2026. MPM BioImpact LLC leads at 15.2% 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

MPM BioImpact LLC

CIK 0001687078

$87M4.8M6.68%Q1 2026 02

EcoR1 Capital, LLC

CIK 0001587114

$86M4.8M3.66%Q1 2026 03

Blue Owl Capital Holdings LP

CIK 0001858703

$57M3.2M15.20%Q1 2026 04

WELLINGTON MANAGEMENT GROUP LLP

CIK 0000902219

$41M2.3M0.01%Q1 2026 05

T. Rowe Price Investment Management, Inc.

CIK 0001897612

$38M2.1M0.03%Q1 2026 06

BlackRock, Inc.

CIK 0002012383

$38M2.1M0.00%Q1 2026 07

RTW INVESTMENTS, LP

CIK 0001493215

$28M1.6M0.28%Q1 2026 08

PRICE T ROWE ASSOCIATES INC /MD/

CIK 0000080255

$28M1.6M0.00%Q1 2026 09

RA CAPITAL MANAGEMENT, L.P.

CIK 0001346824

$27M1.5M0.28%Q1 2026 10

JANUS HENDERSON GROUP PLC

CIK 0001274173

$26M1.5M0.01%Q1 2026 11

Octagon Capital Advisors LP

CIK 0001839435

$17M961K1.90%Q1 2026 12

Avidity Partners Management LP

CIK 0001791827

$17M937K1.83%Q1 2026 13

Merck & Co., Inc.

CIK 0000310158

$17M953K4.88%Q1 2026 14

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$15M834K0.00%Q1 2026 15

EVENTIDE ASSET MANAGEMENT, LLC

CIK 0001442891

$9M507K0.15%Q1 2026 16

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$9M492K0.00%Q1 2026 17

STATE STREET CORP

CIK 0000093751

$8M428K0.00%Q1 2026 18

a16z Capital Management, L.L.C.

CIK 0001540358

$7M415K0.58%Q1 2026 19

FMR LLC

CIK 0000315066

$7M386K0.00%Q1 2026 20

UBS Group AG

CIK 0001610520

$6M353K0.00%Q1 2026

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