Amphastar Pharmaceuticals, Inc.

AMPHNASDAQ

$25.54-0.37 (-1.43% today)

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

Amphastar Pharmaceuticals, Inc. price and activity chart data

Showing the 1Y range: Oct 7, 2025 to Oct 7, 2026. Price (-1.1%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
BlackRock, Inc.	12.28%	$105M	0.00%	Not reported
Dimensional Fund Advisors LP	5.42%	$46.5M	0.01%	Not reported
State Street Corp	3.86%	$33.1M	0.00%	Not reported
Vanguard Capital Management LLC	3.48%	$29.9M	0.00%	Not reported
American Century Companies Inc	2.77%	$23.7M	0.01%	Not reported
Marshall Wace, LLP	2.51%	$21.5M	0.02%	Not reported
Geode Capital Management, LLC	2.28%	$19.6M	0.00%	Not reported
Fuller & Thaler Asset Management, Inc.	2.23%	$19.2M	0.05%	Not reported
D. E. Shaw & Co., Inc.	2.09%	$17.9M	0.01%	Not reported
Vanguard Portfolio Management LLC	1.90%	$16.3M	0.00%	Not reported
LSV Asset Management	1.51%	$13M	0.02%	Reduce 1.49%
Renaissance Technologies LLC	1.23%	$10.6M	0.01%	Not reported
Goldman Sachs Group Inc	1.19%	$10.2M	0.00%	Not reported
Systematic Financial Management LP	1.03%	$8.83M	0.18%	Reduce 3.43%
Morgan Stanley	1.02%	$8.78M	0.00%	Not reported
UBS Group AG	0.92%	$7.93M	0.00%	Not reported
Denali Advisors LLC	0.88%	$7.59M	0.76%	Add 41.09%
Northern Trust Corp	0.87%	$7.49M	0.00%	Not reported
Bridge City Capital, LLC	0.80%	$6.84M	1.56%	Add 1.08%
Charles Schwab Investment Management Inc	0.73%	$6.26M	0.00%	Not reported
Bridgeway Capital Management, LLC	0.70%	$6.03M	0.11%	Not reported
Royce & Associates LP	0.69%	$5.95M	0.05%	Not reported
Two Sigma Investments, LP	0.58%	$5.01M	0.00%	Not reported
First Trust Advisors LP	0.58%	$4.98M	0.00%	Add 63.99%
Pacer Advisors, Inc.	0.57%	$4.87M	0.01%	Reduce 7.76%
Bank of New York Mellon Corp	0.55%	$4.69M	0.00%	Not reported
Vanguard Fiduciary Trust Co	0.53%	$4.53M	0.00%	Not reported
AQR Capital Management LLC	0.49%	$4.21M	0.00%	Not reported
Principal Financial Group Inc	0.48%	$4.12M	0.00%	Not reported
New York State Common Retirement Fund	0.43%	$3.66M	0.00%	Not reported
Jane Street Group, LLC	0.42%	$3.61M	0.00%	Not reported
Empowered Funds, LLC	0.38%	$3.29M	0.02%	Reduce 10.21%
Invesco Ltd.	0.37%	$3.19M	0.00%	Not reported
Victory Capital Management Inc	0.35%	$3.02M	0.00%	Not reported
Universal- Beteiligungs- und Servicegesellschaft mbH	0.33%	$2.81M	0.00%	Not reported
Bank of America Corp	0.32%	$2.76M	0.00%	Not reported
Algert Global LLC	0.31%	$2.65M	0.03%	Not reported
Lam Group, Inc.	0.31%	$2.64M	1.31%	Not reported
Nordea Investment Management AB	0.30%	$2.56M	0.00%	Add 2.51%
Bessemer Group Inc	0.29%	$2.45M	0.00%	Reduce 0.57%
Arrowstreet Capital, Limited Partnership	0.27%	$2.35M	0.00%	Not reported
Public Sector Pension Investment Board	0.27%	$2.35M	0.01%	Reduce 7.84%
Nuveen, LLC	0.21%	$1.78M	0.00%	Not reported
Vanguard Global Advisers, LLC	0.21%	$1.77M	0.00%	Not reported
Exchange Traded Concepts, LLC	0.20%	$1.76M	0.01%	Add 5.63%
Rhumbline Advisers	0.19%	$1.62M	0.00%	Not reported
Squarepoint Ops LLC	0.19%	$1.59M	0.00%	Not reported
Legal & General Group Plc	0.18%	$1.58M	0.00%	Not reported
Assetmark, Inc	0.16%	$1.38M	0.00%	Add 27.64%
Ameriprise Financial Inc	0.16%	$1.38M	0.00%	Not reported

50 of 198 holders

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