How many employees work at Amphastar Pharmaceuticals?

Amphastar Pharmaceuticals, Inc. has 689 employees, according to Revelio Labs workforce intelligence data. The YoY growth rate is 1.7%.

Data source: Revelio Labs Coverage: Global workforce Latest update: December 2025

About Amphastar Pharmaceuticals

Amphastar Pharmaceuticals, Inc., headquartered in Rancho Cucamonga, California, established in 1996, is a recognized specialty pharmaceutical company that uses state-of-the-art, cGMP compliant facilities to develop, manufacture, and market injectable and inhalation products. In addition to the Corporate Headquarters, Amphastar has five manufacturing facilities located in the United States, China and Europe along with a state-of-the-art New Drug Research Center. Amphastar and its subsidiaries each have their own distinct focus that they skillfully bring together to meet the varied needs of the pharmaceutical industry. We currently produce approximately 15 injectable products while we continue to develop a portfolio of generic and branded products that target large markets with high technical barriers to entry. Amphastar’s long-standing relationship with the major group purchasing organizations and drug wholesalers in the U.S. enables it to establish significant market share upon the introduction of its new products.

As of December 2025

Amphastar Pharmaceuticals
workforce metrics

Headcount

689

Avg. Salary

$81.8k

Tenure

4.8yr

Growth Rate

1.7%

Hiring Rate

Attrition Rate

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Employee Headcount

Interactive chart of Amphastar Pharmaceuticals annual worldwide employee count from 2023 to 2025.

  • Amphastar Pharmaceuticals total number of employees in 2025 was 689, a 1.7% increase from 2024.
  • Amphastar Pharmaceuticals total number of employees in 2024 was 678, a 4.8% increase from 2023.
  • Amphastar Pharmaceuticals total number of employees in 2023 was 646, a 2.2% increase from 2022.

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Employee Geographic Breakdown

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Employee Role Breakdown

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Employee Compensation

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Active Job Postings

Interactive chart of Amphastar Pharmaceuticals annual active job postings from 2023 to 2025.

  • Amphastar Pharmaceuticals active job postings in 2025 was 18, a 28.6% decline from 2024.
  • Amphastar Pharmaceuticals active job postings in 2024 was 24, a 11.8% decline from 2023.
  • Amphastar Pharmaceuticals active job postings in 2023 was 27, a 3.8% increase from 2022.

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Employee Sentiment

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