AI Holders Summary · Q1 2026

362 institutions reported ATMU in Q1 2026. BlackRock, Inc. leads at 13.3% of the visible book.

Top holders

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

Hide index funds / market makers / custodians(5 on this page)

#HolderValueShares% port.Quarter

BlackRock, Inc.

CIK 0002012383

$387M6.8M0.01%Q1 2026 02

FMR LLC

CIK 0000315066

$280M4.9M0.01%Q1 2026 03

PRICE T ROWE ASSOCIATES INC /MD/

CIK 0000080255

$255M4.5M0.03%Q1 2026 04

Vanguard Portfolio Management

CIK 0002100121· Index

$209M3.7M0.01%Q1 2026 05

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$202M3.6M0.01%Q1 2026 06

Invesco Ltd.

CIK 0000914208

$190M3.3M0.02%Q1 2026 07

GOLDMAN SACHS GROUP INC

CIK 0000886982

$187M3.3M0.02%Q1 2026 08

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$150M2.6M0.01%Q1 2026 09

FIRST TRUST ADVISORS LP

CIK 0001125816· Index

$125M2.2M0.09%Q1 2026 10

STATE STREET CORP

CIK 0000093751

$108M1.9M0.00%Q1 2026 11

MORGAN STANLEY

CIK 0000895421

$99M1.7M0.01%Q1 2026 12

T. Rowe Price Investment Management, Inc.

CIK 0001897612

$90M1.6M0.06%Q1 2026 13

JANUS HENDERSON GROUP PLC

CIK 0001274173

$88M1.6M0.04%Q1 2026 14

Nuveen, LLC

CIK 0001871926

$82M1.4M0.02%Q1 2026 15

WELLINGTON MANAGEMENT GROUP LLP

CIK 0000902219

$79M1.4M0.01%Q1 2026 16

Channing Capital Management, LLC

CIK 0001302404

$79M1.4M2.01%Q1 2026 17

D. E. Shaw & Co., Inc.

CIK 0001009207

$75M1.4M0.04%Q4 2025 18

MANGROVE PARTNERS IM, LLC

CIK 0001535392

$75M1.3M6.04%Q1 2026 19

DIMENSIONAL FUND ADVISORS LP

CIK 0000354204· Quasi-passive

$74M1.3M0.02%Q1 2026 20

EMINENCE CAPITAL, LP

CIK 0001107310

$73M1.3M1.67%Q1 2026

Page 1 of 19

342 more holders available. Log in →