Amphastar Pharmaceuticals Ownership

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

Recent Insider Transactions

NasdaqGS:AMPH Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
12 Nov 24	SellUS$121,993	Richard Prins	Individual	2,500	US$48.80
05 Sep 24	SellUS$139,417	Floyd Petersen	Individual	3,000	US$46.47
10 Jun 24	SellUS$124,200	Floyd Petersen	Individual	3,000	US$41.40
05 Mar 24	SellUS$589,724	Michael Zasloff	Individual	12,500	US$47.53

Insider Trading Volume

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

Ownership Breakdown

What is the ownership structure of AMPH?
Owner Type	Number of Shares	Ownership Percentage
State or Government	19,850	0.0413%
General Public	1,748,791	3.64%
Individual Insiders	3,879,908	8.07%
Private Companies	6,827,679	14.2%
Institutions	35,605,205	74.1%

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

Top Shareholders

Top 25 shareholders own 75.77% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
14.2%	Applied Physics & Chemistry Laboratories, Inc.	6,827,679	US$250.1m	0%	no data
12.6%	BlackRock, Inc.	6,032,722	US$221.0m	1.52%	no data
5.64%	The Vanguard Group, Inc.	2,711,473	US$99.3m	1.44%	no data
4.81%	Yongfeng Zhang	2,312,948	US$84.7m	-5.13%	no data
4.44%	TD Asset Management, Inc.	2,135,038	US$78.2m	26.2%	0.05%
4.05%	Federated Hermes, Inc.	1,947,100	US$71.3m	0.12%	0.17%
3.36%	Neuberger Berman Investment Advisers LLC	1,615,088	US$59.2m	-0.46%	0.04%
3.18%	State Street Global Advisors, Inc.	1,530,464	US$56.1m	0.06%	no data
2.62%	Fuller & Thaler Asset Management, Inc.	1,260,767	US$46.2m	-0.95%	0.18%
2.48%	Toronto-Dominion Bank, Banking Investments	1,191,110	US$43.6m	10.4%	0.06%
2.27%	Dimensional Fund Advisors LP	1,093,302	US$40.0m	2.15%	0.01%
2.12%	Ziping Luo	1,021,491	US$37.4m	-10.9%	no data
1.91%	Geode Capital Management, LLC	920,363	US$33.7m	1.55%	no data
1.33%	American Century Investment Management Inc	639,592	US$23.4m	-13.6%	0.01%
1.21%	Northern Trust Global Investments	583,362	US$21.4m	3.41%	no data
1.18%	T. Rowe Price Group, Inc.	568,894	US$20.8m	-2.57%	no data
1.18%	Marshall Wace LLP	568,494	US$20.8m	150%	0.03%
1.12%	Boston Trust Walden Company	539,639	US$19.8m	0%	0.13%
1.02%	Renaissance Technologies LLC	489,400	US$17.9m	-8.98%	0.03%
0.99%	Bessemer Investment Management LLC	477,021	US$17.5m	2.31%	0.02%
0.91%	Morgan Stanley, Investment Banking and Brokerage Investments	435,939	US$16.0m	18.1%	no data
0.86%	Mesirow Financial Investment Management, Inc.	413,949	US$15.2m	17.1%	0.22%
0.84%	Granite Investment Partners, LLC	405,718	US$14.9m	2.06%	0.6%
0.75%	Goldman Sachs Group, Investment Banking and Securities Investments	359,559	US$13.2m	323%	0.01%
0.73%	Charles Schwab Investment Management, Inc.	350,056	US$12.8m	-2.55%	no data

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2025/01/10 19:29
End of Day Share Price	2025/01/08 00:00
Earnings	2024/09/30
Annual Earnings	2023/12/31

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 here.

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

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Analyst Sources

Amphastar Pharmaceuticals, Inc. is covered by 11 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
Gary Nachman	BMO Capital Markets Equity Research
Jason Matthew Gerberry	BofA Global Research
Timothy Chiang	Capital One Securities, Inc.