Top Tech Startups in California, US in 2026

Untapped Ventures is an early-stage VC firm backing technical AI founders building the next generation of AI-Native B2B startups - from Agentic AI and Vertical AI to AI Infrastructure. We lead, co-lead, and follow Pre-Seed and Seed rounds with $500K-$2M checks for AI startups with a focus on Native AI, Frontier AI, Embodied AI, Deep Tech AI, and AI Convergence. Our mission is to help transform the lives of 1 billion people through technology by combining early capital with hands-on growth expertise and access to a powerful network of advisors, operators, and investors.

Trial Library is an AI-native platform that matches cancer patients to clinical trials at the point of care. We connect patients, providers, and biopharma sponsors by making trial access faster, simpler, and built into routine care. Our team guides patients through the trial lifecycle while providers stay in the loop and patients stay in their care.

We've been best in class solving some of the business world's most difficult problems. Such as how to organize your customer contracts and then use the data in those contracts to power your business. Sounds simple, but it's been frustrating businesses for years.

EITACIES is an IT services provider with a range of capabilities in custom software development, data analytics, cybersecurity, project management, HR services and IT solutions. They have a team of experienced professionals who specialize in delivering innovative solutions to the public and private sectors. They aim to understand clients' unique needs and provide solutions that meet those needs while building long-term partnerships with clients.

Radixiy is an IT solutions provider headquartered in San Jose, California, United States, founded by technology leaders who spent 20+ years in the IT industry building software solutions for enterprise-level customers. We are innovators, problem-solvers, and trusted partners in digital transformation. With a passion for technology and a commitment to excellence, we specialize in building custom software solutions that help businesses thrive in an ever-changing digital world. Our team brings together expertise across industries, blending creativity with technical precision to deliver scalable, secure, and future-ready applications. From startups to enterprises, we collaborate closely with clients to understand their vision, tackle their unique challenges, and transform ideas into impactful solutions.

VAMOS (vamosx.co) helps local taxis compete with market giants, using technology designed to optimise costs, increase profits, and connect millions of people worldwide. Traditional taxi drivers face fierce competition from Uber and Lyft, often losing market share and revenue. VAMOS’s cutting-edge B2B2C technology levels the playing field, streamlining operations, attracting more riders, reducing costs, and increasing earning potential from both rides and deliveries. Introducing VAMOS: revolutionising transportation for island destinations by equipping local taxi drivers with advanced technology to reach more riders and boost their earnings. Our intuitive app delivers smarter, faster, and greener rides, transforming every journey into a seamless experience. Sustainability impact: At VAMOS, we are committed to creating a lasting positive impact in destinations around the world. By allocating a percentage of our revenue to community development initiatives, we directly support local education, infrastructure, and environmental conservation efforts.

NS Consultancy Global is a security and risk consultancy dedicated to helping organizations operate with confidence in an unpredictable world. We work alongside boards, executives, and operational leaders to clarify risk, strengthen protection, and build resilient organizations that can withstand disruption. Our consultants bring deep experience across security strategy, risk management, and crisis preparedness. We combine analytical rigour with practical insight, turning complex threats into clear choices and actionable plans. Every engagement is tailored, discreet, and aligned with your broader business objectives—not treated as a standalone security exercise. Whether you are safeguarding people and facilities, preparing for critical incidents, or reassuring regulators and stakeholders, NS Consultancy Global acts as a trusted, independent partner. Our focus is simple: to help you anticipate risk, respond decisively, and protect what matters most.