Amphastar Pharmaceuticals Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

DB:29A Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Role	Shares	Max Price
11 Aug 26	Sell€140,261	Richard Prins	Individual		7,973	€17.59
12 Dec 25	Sell€91,586	Floyd Petersen	Individual		4,163	€22.08

Insider Trading Volume

Insider Buying: 29A insiders have only sold shares in the past 3 months.

Ownership Breakdown

What is the ownership structure of 29A?
Owner Type	Number of Shares	Ownership Percentage
State or Government	8,619	0.0203%
General Public	1,234,776	2.9%
Individual Insiders	4,420,326	10.4%
Private Companies	6,827,679	16%
Institutions	30,048,761	70.6%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 77.81% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
16.1%	Applied Physics & Chemistry Laboratories, Inc.	6,827,679	€119.1m	0%	no data
12.3%	BlackRock, Inc.	5,224,934	€91.2m	-3.62%	no data
6.28%	Yongfeng Zhang	2,669,879	€46.6m	1.78%	no data
5.42%	Dimensional Fund Advisors LP	2,305,107	€40.2m	13.7%	0.01%
4.17%	Vanguard Capital Management, LLC	1,774,699	€31.0m	0%	no data
3.86%	State Street Investment Management	1,642,126	€28.6m	2.15%	no data
2.77%	American Century Investment Management Inc	1,176,626	€20.5m	15.6%	0.01%
2.62%	Ziping Luo	1,113,786	€19.4m	2.1%	no data
2.41%	Marshall Wace LLP	1,025,640	€17.9m	-17.1%	0.02%
2.28%	Geode Capital Management, LLC	969,840	€16.9m	-0.7%	no data
2.23%	Fuller & Thaler Asset Management, Inc.	949,238	€16.6m	-32%	0.05%
2.11%	The Toronto-Dominion Bank	898,895	€15.7m	0%	0.02%
1.85%	Vanguard Portfolio Management, LLC	787,816	€13.7m	0%	no data
1.56%	D. E. Shaw & Co., L.P.	665,542	€11.6m	19.5%	0.01%
1.51%	LSV Asset Management	642,014	€11.2m	-1.49%	0.02%
1.34%	Invesco Capital Management LLC	571,414	€10.0m	22.4%	no data
1.3%	Renaissance Technologies LLC	553,900	€9.7m	1.69%	0.01%
1.19%	Bridgeway Capital Management, LLC	504,772	€8.8m	3.13%	0.12%
1.12%	UBS Asset Management AG	475,638	€8.3m	52.5%	no data
1.06%	Systematic Financial Management LP	452,898	€7.9m	3.98%	0.16%
0.95%	Royce & Associates, LP	406,175	€7.1m	15.3%	0.06%
0.88%	Denali Advisors, LLC	375,965	€6.6m	41.1%	0.73%
0.88%	Northern Trust Global Investments	372,279	€6.5m	0.24%	no data
0.87%	Millennium Management LLC	371,373	€6.5m	27.8%	no data
0.8%	Bridge City Capital, LLC	338,708	€5.9m	1.08%	1.6%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/08/14 05:16
End of Day Share Price	2026/08/14 00:00
Earnings	2026/06/30
Annual Earnings	2025/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

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Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Amphastar Pharmaceuticals, Inc. is covered by 14 analysts. 6 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Glen Santangelo	Barclays
Gary Nachman	BMO Capital Markets Equity Research
Pavan Patel	BofA Global Research