DOSSIER · 13F Holders · Q2 2026Healthcare · Pharmaceutical Preparations
AMPH

AMPHASTAR PHARMACEUTICALS IN

226 institutions still hold AMPHASTAR PHARMACEUTICALS IN as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 03209R103·Pharmaceutical Preparations·226 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$439M
visible holders
Holders
226
filers reporting
Concentration
24.00%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q2 2026

226 institutions reported AMPH in Q2 2026. BlackRock, Inc. leads at 24.0% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$105M5.2M0.00%Q2 2026
02
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$40M2.0M0.01%Q1 2026
03
STATE STREET CORP
CIK 0000093751
$33M1.6M0.00%Q2 2026
04
MARSHALL WACE, LLP
CIK 0001318757
$33M1.2M0.03%Q4 2025
05
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$30M1.5M0.00%Q1 2026
06
FULLER & THALER ASSET MANAGEMENT, INC.
CIK 0001082327
$27M1.4M0.09%Q1 2026
07
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$20M1.0M0.01%Q1 2026
08
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$19M977K0.00%Q1 2026
09
Epoch Investment Partners, Inc.
CIK 0001305841
$18M899K0.11%Q1 2026
10
Vanguard Portfolio Management
CIK 0002100121· Index
$15M788K0.00%Q1 2026
11
D. E. Shaw & Co., Inc.
CIK 0001009207
$15M557K0.01%Q4 2025
12
LSV ASSET MANAGEMENT
CIK 0001050470
$13M652K0.03%Q1 2026
13
Invesco Ltd.
CIK 0000914208
$12M605K0.00%Q1 2026
14
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$11M554K0.02%Q1 2026
15
SYSTEMATIC FINANCIAL MANAGEMENT LP
CIK 0001085936
$9M453K0.20%Q1 2026
16
MORGAN STANLEY
CIK 0000895421
$8M420K0.00%Q1 2026
17
UBS Group AG
CIK 0001610520
$8M420K0.00%Q1 2026
18
ROYCE & ASSOCIATES LP
CIK 0000906304
$8M406K0.08%Q1 2026
19
NORTHERN TRUST CORP
CIK 0000073124· Index
$7M372K0.00%Q1 2026
20
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$7M371K0.00%Q1 2026
Page 1 of 12
206 more holders available. Log in →
Insiders at AMPHASTAR PHARMACEUTICALS IN
Pierce Anthony TLee HowardPrins Richard KDeflin GayleGaugh David RussellGerst Diane G.Zasloff Michael ALiawatidewi Yakob