AMPHASTAR PHARMACEUTICALS IN

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

AMPH (AMPHASTAR PHARMACEUTICALS IN) is held by 108 institutional investors as of Q2 2026. Largest holders: BlackRock, Inc. ($105.4M), DIMENSIONAL FUND ADVISORS LP ($46.5M), STATE STREET CORP ($33.1M). Net institutional sentiment: Mixed.

108

Holders

(6 Elite)

$489.1M

Total Value

43% (110)

Consensus

47 buying - 63 selling

13F: Jun 30, 2026Insider & Congress: Updated regularly

Smart Money Verdict

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Institutional (13F)65

Insider (Form 4)53

Activist (13D/13G)46

Congressional (STOCK Act)44

Holder Quality

69

★★★★★

Elite

41

★★★★

Strong

77

★★★

Solid

35

★★

Below

42

★

Weak

Held by 108 funds

6 elite

Who's Trading

Source dates: Price Aug 28, 2026 · Insiders Dec 18, 2025 · Activists Jul 14, 2026 · Congress none

ActivistDimensional Fund Advisors LP5.2%Jul 14, 2026

ActivistThe Vanguard Group0.0%Mar 26, 2026

InsiderZRZhou RongSell $256KDec 17, 2025

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Top Holders

Top Holders (108)History

AllNewIncreasedHeldDecreasedExited

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Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
BlackRock, Inc.	Decreased	5.2M(-3.6%)	$105.4M	0.0%	-40.16%	0
DIMENSIONAL FUND ADVISORS LP	Increased	2.3M(+13.7%)	$46.5M	0.0%	-28.45%	33
STATE STREET CORP	Increased	1.6M(+2.1%)	$33.1M	0.0%	-61.12%	29
VAVANGUARD CAPITAL MANAGEMENT LLC	Decreased	1.5M(-4.0%)	$29.9M	0.0%	+11.04%	0
AMERICAN CENTURY COMPANIES INC	Increased	1.2M(+15.6%)	$23.7M	0.0%	-19.99%	33
MWMARSHALL WACE, LLP	Increased	1.1M(+4.0%)	$21.5M	0.0%	-34.96%	30
GEODE CAPITAL MANAGEMENT, LLC	Decreased	969,840(-0.7%)	$19.6M	0.0%	-12.91%	0
FULLER & THALER ASSET MANAGEMENT, INC.	Decreased	949,238(-32.0%)	$19.2M	0.1%	-31.16%	0
DED. E. Shaw & Co., Inc.	Increased	887,048(+33.3%)	$17.9M	0.0%	-6.80%	36
VPVANGUARD PORTFOLIO MANAGEMENT LLC	Increased	809,568(+2.8%)	$16.3M	0.0%	+10.99%	29
RENAISSANCE TECHNOLOGIES LLC	Decreased	525,100(-5.2%)	$10.6M	0.0%	-27.13%	0
GOLDMAN SACHS GROUP INC	Increased	505,360(+53.4%)	$10.2M	0.0%	-19.65%	39
MORGAN STANLEY	Increased	434,840(+3.5%)	$8.8M	0.0%	-38.57%	29
UBS Group AG	Decreased	393,110(-6.5%)	$7.9M	0.0%	-16.85%	0
NORTHERN TRUST CORP	Decreased	370,991(-0.3%)	$7.5M	0.0%	-23.19%	0
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	Decreased	310,178(-3.4%)	$6.3M	0.0%	-18.76%	0
ROYCE & ASSOCIATES LP	Decreased	294,758(-27.4%)	$5.9M	0.0%	-17.80%	0
TWO SIGMA INVESTMENTS, LP	Increased	248,115(+79.6%)	$5M	0.0%	-22.96%	41
FIRST TRUST ADVISORS LP	Increased	246,951(+64.0%)	$5M	0.0%	-7.07%	39
Bank of New York Mellon Corp	Decreased	232,343(-4.5%)	$4.7M	0.0%	-4.19%	0

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High Conviction Moves-Smart Money Convergence-Fund Consensus-Double-Down Detection

Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer