AMPHASTAR PHARMACEUTICALS IN

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

AMPH (AMPHASTAR PHARMACEUTICALS IN) is held by 113 institutional investors as of Q1 2026. Largest holders: BlackRock, Inc. ($106.2M), DIMENSIONAL FUND ADVISORS LP ($39.7M), STATE STREET CORP ($31.5M). Net institutional sentiment: Mixed.

113

Holders

Avg rating(9 Elite)

$511.4M

Total Value

42% (134)

Fund Consensus

53 buying - 73 selling

Smart Money Verdict

View all

41Weak MomentumStrong Convergence

Institutional (13F)45

Insider (Form 4)28

Activist (13D/13G)50

Congressional (STOCK Act)

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See how AMPH's score breaks down across 4 SEC sources

Holder Quality

9

★★★★★

Elite

39

★★★★

Strong

42

★★★

Solid

37

★★

Below

7

★

Weak

Held by 113 funds

9 elite

Who's Trading

ActivistThe Vanguard Group0.0%Mar 26, 2026

InsiderZRZhou RongSell $256KDec 17, 2025

InsiderUNUnknownSell $63KDec 12, 2025

InsiderPFPetersen Floyd F.Sell $45KDec 11, 2025

InsiderPKPRINS RICHARD KSell $113KNov 25, 2025

ActivistBlackRock, Inc.11.5%Oct 17, 2025

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

Positions (113)History

AllNewIncreasedHeldDecreasedExited

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
BlackRock, Inc.	Decreased	5.4M(-0.7%)	$106.2M	0.0%	-54.16%	0
DIMENSIONAL FUND ADVISORS LP	Increased	2M(+12.7%)	$39.7M	0.0%	-47.64%	33
STATE STREET CORP	Increased	1.6M(+4.9%)	$31.5M	0.0%	-70.62%	30
TD ASSET MANAGEMENT INC	Decreased	1.5M(-21.5%)	$30.2M	0.0%	-63.20%	0
FULLER & THALER ASSET MANAGEMENT, INC.	Increased	1.4M(+0.1%)	$27.3M	0.1%	-54.37%	29
MWMARSHALL WACE, LLP	Decreased	1M(-17.1%)	$20.1M	0.0%	-50.96%	0
AMERICAN CENTURY COMPANIES INC	Increased	1M(+52.9%)	$19.9M	0.0%	-41.16%	40
GEODE CAPITAL MANAGEMENT, LLC	Increased	976,650(+10.1%)	$19.1M	0.0%	-33.51%	31
Boston Trust Walden Corp	Decreased	944,789(-13.1%)	$18.5M	0.2%	-58.00%	0
Epoch Investment Partners, Inc.	Decreased	898,895(-20.2%)	$17.6M	0.1%	-65.36%	0
DED. E. Shaw & Co., Inc.	Increased	665,542(+19.5%)	$13M	0.0%	-31.91%	33
Invesco Ltd.	Increased	604,774(+20.6%)	$11.8M	0.0%	-30.90%	33
RENAISSANCE TECHNOLOGIES LLC	Increased	553,900(+1.7%)	$10.9M	0.0%	-44.18%	28
MORGAN STANLEY	Decreased	420,337(-28.9%)	$8.2M	0.0%	-53.63%	0
UBS Group AG	Increased	420,263(+63.8%)	$8.2M	0.0%	-36.30%	40
ROYCE & ASSOCIATES LP	Increased	406,175(+15.3%)	$8M	0.1%	-37.02%	32
NORTHERN TRUST CORP	Increased	372,279(+0.2%)	$7.3M	0.0%	-41.15%	27
MILLENNIUM MANAGEMENT LLC	Increased	371,373(+27.8%)	$7.3M	0.0%	-41.57%	34
GOLDMAN SACHS GROUP INC	Decreased	329,388(-40.8%)	$6.5M	0.0%	-46.04%	0
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	Decreased	325,291(-41.9%)	$6.4M	0.0%	-36.07%	0

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High Conviction Moves-Signal Convergence-Fund Consensus-Double-Down Signals

Data sourced from four SEC data sources: 13F, Form 4, 13D/13G, and STOCK Act. Not financial advice. Full disclaimer