California Top Companies List by Market Cap as of August 2026

Ambarella is a advanced Imaging Solutions that make Cameras smarter by extracting valuable data from high resolution video streams company. The company products are used in a wide variety of human and computer vision applications including video security, advanced driver assistance, electronic mirror, drive recorder, driver or cabin monitoring, autonomous driving and other robotics applications. The headquarters is in USA.

Opendoor Technologies is a Leading Digital Platform for Residential Real Estate company. It is having 1,340 employees as on 2021. The headquarters is in USA.

American States Water Company is the Parent of Golden State Water Company. The company serving over one million people in nine states provides water service to approximately 2,61,000 customer connections located within more than 80 communities and distributes electricity to approximately 24,000 customer connections in the City of Big Bear Lake and surrounding areas in San Bernardino County, California. The headquarters is in USA.

Power Integrations is a is a Silicon Valley based supplier of high-performance components used in high voltage power conversion company. It is a integrated circuits enable compact, energy efficient AC DC power supplies for a vast range of electronic products including smartphones, appliances, smart utility meters, LED lights and numerous industrial applications and critical components in high power systems such as solar and wind energy, industrial motor drives, electric vehicles and high voltage DC transmission lines. The headquarters is in USA.

IDEAYA is a synthetic lethality focused precision medicine oncology company developments and discovery of targeted therapeutics for patient populations selected using molecular diagnostics. The headquarters is in USA.

NMI Holdings is a Insurance company. The headquarters is in USA.