The Pacific Coast Business Times’ collection of Top 25 lists represents data on thousands of companies in Ventura, Santa Barbara and San Luis Obispo counties, collected by our reporters and researchers.

We offer a new list each week ranking the top companies, employers and people operating in one of the many industries that compete in the Tri-Counties. Our editors research and validate all of the information, so that you can be sure you’re getting the most accurate data available.

• All lists come in an Excel compatible format, and you can preview the top listings in HTML format.
• Please note: All list purchases are a one-time download and are non-refundable.

If you have questions about our lists, want to nominate a company for inclusion or need to update information, please contact Special Reports Editor Amber Hair at [email protected].

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Prefer Excel? A complete spreadsheet of this list is available. Download Excel file Life Sciences Companies Ranked by number of employees in the region Rank (Prior) Name Address City, ZIP Phone Website Tri-county employees Employees worldwide Company description Top executive(s) Year est. 1 (1) Amgen 1 Amgen Center Drive Thousand Oaks, 91320 (805) 447-1000 amgen.com 5,500 30,000 Develops and sells drugs for cancer, kidney disease, rheumatoid arthritis, bone disease and other serious illnesses Robert Bradway 1980     Sources: Telephone interviews and email surveys. Notes: This list includes companies that are both based in and outside the tri-county region. nr = not ranked. n/a = not applicable. wnd = would not disclose. In the event of ties, companies were ranked by     worldwide employees. This list was updated in Dec. 2023.