Top Tech Startups in California, US in 2026

Yieldmo is one of the world’s fastest-growing digital advertising and attention analytics companies. Agencies and brands use its premium marketplace to create, measure, model, and optimize their campaigns for unmatched scale and performance. Underpinned by AEROS Attention Analytics, advertisers can now truly understand how consumers are interacting with ads before the click, and after the initial view. Yieldmo ultimately delivers better results by harnessing the power of attention data to drive superior audience engagement and targeting.

Nextdoor is the world's largest social network for the neighborhood, enabling truly local conversations that empower neighbors to build stronger and safer communities. Building connections in the real world is a universal human need. That truth, and the reality that neighborhoods are one of the most important and useful communities in our lives have been guiding principles for Nextdoor. Today, neighbors rely on Nextdoor in more than 242,000 neighborhoods around the world in the United States, the United Kingdom, Germany, France, the Netherlands, Italy, Spain, Sweden, Denmark and Australia, with many more to come.

Lively is the modern HSA experience built for those seeking stability in the ever-shifting and uncertain healthcare landscape. Lively is committed to helping every HSA maximize its potential through intuitive design, accessible support, and ongoing education.

Postman is the leading API platform, used by 17 million developers and 500,000 organizations worldwide. Postman simplifies each step of the API lifecycle and streamlines collaboration so developers and teams can create better APIs—faster. Postman is a global company with headquarters in San Francisco, a large office in Bangalore (where the company was founded), and distributed team members on four continents. Postman is privately held, with funding from Insight Partners, CRV, Nexus Venture Partners, Coatue, Battery Ventures, and BOND. Learn more at postman.com or connect with Postman on Twitter via @getpostman.

Blend makes the process of getting a loan simpler, faster, and safer! With its digital lending platform, Blend helps financial institutions including Wells Fargo and U.S. Bank increase productivity and deliver exceptional customer experiences. The company processes nearly $2 billion in loans daily, helping millions of consumers gain access to the capital they need to lead better lives. Founded in 2012 by a group of former Palantir engineers, Blend has raised $685 million from leading venture investors including Andreessen Horowitz, Canapi Ventures, Capital One Ventures, Coatue, 8VC, Emergence Capital, Founders Fund, General Atlantic, Greylock Partners, Lightspeed Venture Partners, Temasek, and Tiger Global Management.

Chime was created with the mission to make financial peace of mind a reality for millions of Americans. We're one of the fastest-growing financial technology companies in the U.S., offering banking services that are helpful, easy, and free—because we want to profit with our members, not from them. Our model doesn’t rely on overdraft, monthly service, minimum balance, or other member fees—it just focuses on delivering member value. How does Chime work? We partner with regional banks to design member-first financial products. This creates a more competitive market with better, lower-cost options for everyday Americans who aren’t being served well by traditional banks. We offer access to bank accounts with fee-free overdraft, provide members the chance to receive early access to their paychecks, help them improve their credit, and more! We help drive innovation, inclusion, and access across the industry with one of the most experienced leadership teams in fintech guiding us along the way. We were recently valued at over $25.5B and we’ve raised over $1.7B in funding from leading investors including Sequoia Capital Global Equities, SoftBank Vision Fund 2, General Atlantic, Tiger Global, Dragoneer, DST, Coatue, Iconiq, Menlo Ventures and others. *Chime is a financial technology company, not a bank. Banking services provided by, and debit card issued by, The Bancorp Bank or Stride Bank, N.A.; Members FDIC.

Coalition is the world's first Active Insurance provider designed to help prevent digital risk before it strikes. By combining comprehensive insurance coverage and cybersecurity tools, Coalition helps businesses manage and mitigate digital risks. Coalition offers its Active Insurance products in the U.S., U.K., and Canada through relationships with leading global insurers, as well as cyber capacity through its own carrier, Coalition Insurance Company. Coalition's Active Risk Platform provides automated security alerts, threat intelligence, expert guidance, and cybersecurity tools to help businesses worldwide remain resilient against cyber attacks. Headquartered in San Francisco, Coalition is a distributed company with a global workforce that collaborates digitally and in office hubs. Coalition is also home to Coalition Security Labs, our research and innovation center providing cybersecurity education and insights designed to help our policyholders and the broader security community face the evolving cyber threat landscape.

Localcoin is a financial technology company that operates the largest cryptocurrency ATM network in Canada. Our network allows users to buy and sell Bitcoin, Litecoin, and Ethereum at over 400 retail locations across North America in more than 9 provinces and 3 states. Founded in 2017, Localcoin empowers consumers to join the cryptoeconomy by offering a simple cryptocurrency buying/selling experience to over 40,000 customers. Our partners include independent retailers and franchises such as Hasty Market and Gateway Newstands. We are a profitable cryptocurrency startup and we are growing at an exponential rate with over 50 new locations opened monthly. Localcoin’s mission is to bring cryptocurrency to your community, one ATM at a time. Learn more at localcoinatm.com.

Pulse provides software and support to enable top-tier global healthcare practices to attract patients and coordinate care, travel and payment. Our end-to-end solution includes digital marketing, messaging, scheduling, telehealth, EHR, practice management, payments, and analytics.

Using innovative solutions in E-Commerce/Marketplaces, Blockchain, Data Analytics and IIoT that aim to transform the chemical manufacturing, distribution, lab reagents manufacturing and analytical instruments industries.