AI Holders Summary · Q1 2026

221 institutions reported AMPH in Q1 2026. BlackRock, Inc. leads at 22.5% of the visible book.

Top holders

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

Hide index funds / market makers / custodians(4 on this page)

#HolderValueShares% port.Quarter

BlackRock, Inc.

CIK 0002012383

$106M5.4M0.00%Q1 2026 02

DIMENSIONAL FUND ADVISORS LP

CIK 0000354204· Quasi-passive

$40M2.0M0.01%Q1 2026 03

MARSHALL WACE, LLP

CIK 0001318757

$33M1.2M0.03%Q4 2025 04

STATE STREET CORP

CIK 0000093751

$31M1.6M0.00%Q1 2026 05

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$30M1.5M0.00%Q1 2026 06

TD ASSET MANAGEMENT INC

CIK 0001056053

$30M1.5M0.02%Q1 2026 07

FULLER & THALER ASSET MANAGEMENT, INC.

CIK 0001082327

$27M1.4M0.09%Q1 2026 08

AMERICAN CENTURY COMPANIES INC

CIK 0000748054

$20M1.0M0.01%Q1 2026 09

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$19M977K0.00%Q1 2026 10

Boston Trust Walden Corp

CIK 0001534866

$19M945K0.15%Q1 2026 11

Epoch Investment Partners, Inc.

CIK 0001305841

$18M899K0.11%Q1 2026 12

Vanguard Portfolio Management

CIK 0002100121· Index

$15M788K0.00%Q1 2026 13

D. E. Shaw & Co., Inc.

CIK 0001009207

$15M557K0.01%Q4 2025 14

LSV ASSET MANAGEMENT

CIK 0001050470

$13M652K0.03%Q1 2026 15

Invesco Ltd.

CIK 0000914208

$12M605K0.00%Q1 2026 16

RENAISSANCE TECHNOLOGIES LLC

CIK 0001037389

$11M554K0.02%Q1 2026 17

SYSTEMATIC FINANCIAL MANAGEMENT LP

CIK 0001085936

$9M453K0.20%Q1 2026 18

MORGAN STANLEY

CIK 0000895421

$8M420K0.00%Q1 2026 19

UBS Group AG

CIK 0001610520

$8M420K0.00%Q1 2026 20

ROYCE & ASSOCIATES LP

CIK 0000906304

$8M406K0.08%Q1 2026

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