Top Tech Startups in California, US in 2026

Avoca is defining the AI front office built for the $1T home services industry. We're trusted by 800+ operators across HVAC, plumbing, electrical, roofing, pest control, and more. 100 people and growing. Backed by top investors. We have a high-energy, in-office culture across our NYC headquarters and Santa Barbara office.

Cognizant (Nasdaq-100: CTSH) is a professional services companies, transforming clients' business, operating and technology models for the digital era. Our unique industry-based, consultative approach helps clients envision, build and run more innovative and efficient businesses. Headquartered in the U.S., Cognizant is ranked 195 on the Fortune 500 and is consistently listed among the most admired companies in the world. Learn how Cognizant helps clients lead with digital at cognizant.com or follow us @Cognizant

CloudZero acts as the financial control plane for AI economics, giving finance, IT, and engineering a shared system to govern spend, value, and outcomes. Stop guessing whether your AI spend is paying off and focus on the investments that matter most.

Neuralink is developing a fully-implanted, wireless, high-channel count brain-machine interface (BMI) with the goal of enabling people with paralysis to directly use their neural activity to operate computers and mobile devices with speed and ease. Neuralink was founded in 2016 by Elon Musk and the company is headquartered in Fremont, CA with a second location opening in Austin, TX.

Cheesecake Labs is a software design and engineering partner that helps you build successful tech products. We know the process and empower a multidisciplinary team of 60+ designers, engineers, and project managers to collaborate with you and deliver delightful solutions. We offer full-service development for iOS, Android, and Web platforms, including UI/UX design, backend engineering, project management, testing, launching, and maintenance. Our company has been recognized as a Great Place to Work four years in a row (2016 to 2019), as a fast-growing Scale Up company by Endeavor (2019), and has been ranked as a top Mobile and Web app development company by Clutch (since 2016). These companies trusted us and so can you: Singularity University, Tapcart, AES, Cargill/Agriness, Skyroam, Lockitron.

Webstacks is a web design and development agency based in San Diego, CA. Our mission is simple: to be the pioneers of composable websites.

IonPath is a Stanford University spin-out with a vision to transform clinical pathology and tumor imaging, a $10B+ market, with the company's novel, highly multi-parametric imaging technology, Multiplexed Ion Beam Imaging (MIBI). IonPath's MIBI is a step-change improvement over the current leading tumor imaging method, immunohistochemistry (IHC). MIBI enables researchers, pathologists, and clinicians to quantitatively analyze and visually display the complex interactions among cancer tumor cells, proteins, antibodies, T-cells, and other relevant features on cells' surfaces and interiors. Understanding these biological players and their interactions should substantially improve cancer research and drug discovery, produce novel diagnostics, and transform the study of disease mechanisms such as cancer ("pathology"). IonPath will develop and commercialize services, instruments, reagents, and ultimately diagnostic tests based on MIBI technology.

ShopStyle is the leading fashion and lifestyle shopping platform for influencers and consumers. We connect brands and retailers to influencers and shoppers with best-in-class technology, data, and tools to drive new customers and sales. ShopStyle is based in San Francisco with offices in San Mateo, London, NY, and LA. ShopStyle has localized sites in the US, the UK, Japan, Canada, and Australia. We have a bold Silicon Valley outlook on developing transformative technology for fashion and strive to do this bigger and better every day.