Tech Companies in California

In short 23,860 tech companies in Ken's database have their headquarters in California (Oct 17, 2026).

In short By employee count in Ken's database, the largest is Google in Mountain View with 10,001+ employees.

In short We counted tech companies in Ken's database with headquarters in California on Oct 17, 2026.

• Filter: Companies in Software Development, IT Services, Technology, Information and Internet, Computer and Network Security, Computer Hardware or Semiconductor Manufacturing, with headquarters in California, United States, and at least one employee on record.
• Headquarters only. Companies with just an office in California are not counted.
• These are companies in Ken's database (250M people and 24M companies), not every company that exists.
• Some records store the state with a ZIP code, and the state filter misses those, so read the count as a floor. The largest-companies table reads the state from each record's address, so it includes them.
• Counts as of Oct 17, 2026. We check them weekly, and the dates move only when a count or a listed company changes.
• Pages publish only at 50 companies or more. Ken is our product, and these counts come from its company database.

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