Two cybersecurity companies led a week of large startup fundraising in the U.S., each closing $400 million deals that underscored continued investor appetite for security and data governance tools.
Dallas-based Island raised $400 million in Series F financing, with Evolution Equity Partners leading the round. The deal set a $6.4 billion valuation for the company, more than double its 2024 valuation. Island develops tools for secure enterprise digital operations.
New York-based Cyera also secured $400 million in a Series G extension led by Evolution Equity Partners, with Goldman Sachs Growth Equity backing the round. Cyera provides enterprise data security tools that govern both human users and AI agents. The funding brings the company's total raised to $2.7 billion, according to Crunchbase data.
Beyond cybersecurity, the week's top rounds spanned foundational AI, drug discovery, and climate technology.
San Francisco-based Snorkel AI closed a $350 million Series E, with Insight Partners and S32 leading the round. The seven-year-old company, which builds specialized training data and environments for frontier AI labs, was valued at $3.2 billion and reported more than $375 million in annual recurring revenue.
Boulder, Colorado-based Enveda raised $311 million in Series E funding for its AI-enabled drug discovery platform. Catalio Capital Management led the round, which brought the company's total capital raised since inception to more than $845 million.
New York-based Precision Neuroscience secured $250 million in Series D funding for its brain-computer interface technology. Pershing Square and the Ackman Oxman Institute were lead investors.
Seattle-based Hubble Network pulled in $200 million in Series C for its satellite network that extends connectivity to Bluetooth devices. Smith Point Capital led the financing, valuing the company at $1.6 billion.
Three companies tied at $100 million each rounded out the top ten. California-based Rainmaker, which focuses on atmospheric research and cloud seeding to produce freshwater, raised $100 million in Series B from Noa, Upfront Ventures, DCVC, Lowercarbon Capital and Dream Ventures. San Francisco-based Numeral closed a $100 million Series C for its AI-powered sales tax compliance platform, led by Insight Partners. San Francisco-based Micro1, a provider of AI training data, reportedly raised more than $100 million at a $4 billion valuation, according to Forbes.
The rounds, tracked by Crunchbase for the week of Sept. 19-25, 2026, all targeted U.S.-based companies with announced financing of $100 million or more.
