April 3, 2025
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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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Life Sciences Companies
Ranked by number of employees in the region
Rank
(Prior)
Name
Address
City, ZIP
Phone
Website
Tri-county employees
Company description
Top executive(s)
Year
est.
1
(1)
Amgen
1 Amgen Center Drive
Thousand Oaks, 91320
(805) 447-1000
amgen.com
5,5001
Develops and sells drugs for cancer, kidney disease, rheumatoid arthritis, bone disease and other serious illnesses
Robert Bradway
1980