兔子先生传媒

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This is a weekly feature that runs down the week鈥檚 Top 10 announced funding rounds in the U.S. Check out last week鈥檚 biggest funding deal roundup here.

This week delivered a bountiful supply of big startup funding rounds, led by two $400 million financings for cybersecurity unicorns and . Rounding out the week were large financings for startups across hot sectors, including foundational AI, drug discovery, neurotech, and even rainmaking.

1. , $400M, cybersecurity: Island, a developer of tools for secure enterprise digital operations, raised $400 million in Series F financing. led the round, which set a $6.4 billion valuation for the Dallas-based company, more than double its 2024 valuation.

2. , $400M, cybersecurity: Cyera, a provider of enterprise data security tools that govern both humans and AI agents, picked up $400 million in Series G extension funding led by and backed by . The round brings total funding for New York-based Cyera to $2.7 billion, .

3. , $350M, foundational AI: San Francisco-based Snorkel AI, provider of tools for frontier labs and AI teams to develop specialized training data and environments, secured $350 million in Series E funding. and led the round, valuing the 7-year-old company at $3.2 billion, and it now has more than $375 million in annual recurring revenue.

4. , $311M, biotech: Enveda, an AI-enabled drug discovery startup, closed on $311 million in Series E financing led by and joined by a long list of new and existing investors. The round brings the Boulder, Colorado-based company’s total capital raised since inception to more than $845 million.

5. , $250M, neurotech: New York-based Precision Neuroscience, a startup focused on brain-computer interface technology, secured $250 million in Series D funding with and the as lead investors.

6. , $200M, wireless communications: Hubble Network, operator of a satellite network that extends connectivity to Bluetooth devices, pulled in $200 million in Series C funding. led the financing, which set a $1.6 billion valuation for the Seattle-based company.

7. , $155M, pharmacy benefits: New York-based Rightway, a provider of pharmacy benefits and care navigation services, raised $155 million in Series E funding led by . The startup will use the financing in part to expand its AI capabilities.

8. (tied) , $100M, cloud seeding: El Segundo, California-based Rainmaker, a startup focused on atmospheric research and producing new freshwater through cloud seeding, picked up $100 million in Series B funding. The round includes investments from , , , and .

8. (tied) , $100M, tax compliance: San Francisco-based Numeral, an AI-powered sales tax compliance platform, closed on a $100 million Series C round led by .

8. (tied) , $100M, AI data: San Francisco-based Micro1, a provider of AI training data to major AI labs, has reportedly raised a fresh funding round of more than $100 million at a valuation of $4 billion, according to a citing people familiar with the deal.

Methodology

We tracked the largest announced rounds in the 兔子先生传媒 database that were raised by U.S.-based companies for the period of Sept. 19-25, 2026. Although most announced rounds are in the database, there may be a small time lag, as some rounds are reported late in the week.

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