AMPHASTAR PHARMACEUTICALS IN (AMPH) is held by 118 institutional investors that disclose positions via SEC 13F filings. The largest disclosed holder is BlackRock, Inc. as of Q1 2026.

Are institutions buying or selling AMPH?

In Q1 2026, 58 institutions opened or increased positions in AMPHASTAR PHARMACEUTICALS IN while 73 reduced or exited — a net selling quarter.

What is the Smart Money Verdict on AMPH?

The Smart Money Verdict combines four independent sources (institutional 13F activity, insider trades, activist filings, and congressional trades) into a single assessment for AMPHASTAR PHARMACEUTICALS IN.

How many hedge funds hold AMPH?

118 institutional investors report holding AMPHASTAR PHARMACEUTICALS IN (AMPH) as of Q1 2026, based on SEC 13F filings.

Is institutional money flowing into AMPH?

As of Q1 2026, tracked institutions in AMPHASTAR PHARMACEUTICALS IN show 58 buyers versus 73 sellers — net outflows.

AMPHASTAR PHARMACEUTICALS IN

AMPH·03209R103·US·Common Stock·Healthcare - Drug Manufacturers - Specialty & Generic-13D/G

118

Holders

Avg rating(27 Elite)

$563.9M

Total Value

44% (139)

Fund Consensus

58 buying - 73 selling

Smart Money Verdict

View all

Held by 118 funds

27 elite

Who's Trading

Activist

Dimensional Fund Advisors LP5.2%Jul 14, 2026

Activist

The Vanguard Group0.0%Mar 26, 2026

InsiderZRZhou RongSell $256KDec 17, 2025

InsiderPFPetersen Floyd F.Sell $63KDec 12, 2025

InsiderPFPetersen Floyd F.Sell $45KDec 11, 2025

InsiderPKPRINS RICHARD KSell $113KNov 25, 2025

InsiderPFPetersen Floyd F.Sell $442KNov 13, 2025

Activist

BlackRock, Inc.11.5%Oct 17, 2025

InsiderPFPetersen Floyd F.Sell $14KOct 1, 2025

InsiderPFPetersen Floyd F.Sell $15KSep 2, 2025

View all insider trades View all activist filings

13F: Mar 31, 2026Insider & Congress: Updated regularly

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
BlackRock, Inc.	Decreased	5.4M(-0.7%)	$106.2M	0.0%	-49.13%	0
DIMENSIONAL FUND ADVISORS LP	Increased	2M(+12.7%)	$39.7M	0.0%	-41.90%	33
STATE STREET CORP	Increased	1.6M(+4.9%)	$31.5M	0.0%	-67.40%	30
VAVANGUARD CAPITAL MANAGEMENT LLC	New	1.5M	$30.2M	0.0%	-5.60%	40
TD ASSET MANAGEMENT INC	Decreased	1.5M(-21.5%)	$30.2M	0.0%	-59.17%	0
FULLER & THALER ASSET MANAGEMENT, INC.	Increased	1.4M(+0.1%)	$27.3M	0.1%	-49.36%	29
MWMARSHALL WACE, LLP	Decreased	1M(-17.1%)	$20.1M	0.0%	-45.58%	0
AMERICAN CENTURY COMPANIES INC	Increased	1M(+52.9%)	$19.9M	0.0%	-34.70%	40
GEODE CAPITAL MANAGEMENT, LLC	Increased	976,650(+10.1%)	$19.1M	0.0%	-26.22%	31
Boston Trust Walden Corp	Decreased	944,789(-13.1%)	$18.5M	0.2%	-53.39%	0
Epoch Investment Partners, Inc.	Decreased	898,895(-20.2%)	$17.6M	0.1%	-61.56%	0
VPVANGUARD PORTFOLIO MANAGEMENT LLC	New	787,816	$15.4M	0.0%	-5.60%	39
DED. E. Shaw & Co., Inc.	Increased	665,542(+19.5%)	$13M	0.0%	-24.44%	33
Invesco Ltd.	Increased	604,774(+20.6%)	$11.8M	0.0%	-23.32%	33
RENAISSANCE TECHNOLOGIES LLC	Increased	553,900(+1.7%)	$10.9M	0.0%	-38.05%	28
MORGAN STANLEY	Decreased	420,337(-28.9%)	$8.2M	0.0%	-48.55%	0
UBS Group AG	Increased	420,263(+63.8%)	$8.2M	0.0%	-29.31%	40
ROYCE & ASSOCIATES LP	Increased	406,175(+15.3%)	$8M	0.1%	-30.12%	32
NORTHERN TRUST CORP	Increased	372,279(+0.2%)	$7.3M	0.0%	-34.70%	27
MILLENNIUM MANAGEMENT LLC	Increased	371,373(+27.8%)	$7.3M	0.0%	-35.16%	34