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The week's 10 biggest funding rounds: A big week for big checks. August 7, 2026 Want to keep track of the largest startup funding deals in 2026 with its curated list of $100 million-plus venture deals to U.S.-based companies? Check out The Crunchbase Megadeals Board. This is a weekly feature that runs down the week's top 10 announced funding rounds in the U.S. Check out last week's biggest funding deal roundup here. Startups raised funding rounds with a lot of zeroes at the end this week. Three companies - Hadrian, Base Power and Valar Atomics - secured financings of $1 billion or more. Additionally, a robust lineup of companies in sectors including AI, e-commerce, cybersecurity, biotech and even mining also announced sizable new rounds. 1. Hadrian, $1.37B, manufacturing: Hadrian, a developer of highly automated factories, raised $1.37 billion in Series D funding led by WCM Investment Management, Washington Harbour Partners, Valor Equity Partners, 137 Ventures, JP Morgan Chase and Baillie Gifford. The financing sets a $7.87 billion valuation for the 6-year-old, Torrance, California-based company. 2. (tied) Base Power, $1B, energy storage: Austin-based Base Power, a developer of residential battery energy storage systems, secured $1 billion in Series D financing at a $13 billion post-money valuation. Ribbit Capital, Addition, Valor Equity Partners and JP Morgan Chase led the financing, which coincided with the launch of the company's Base Core home battery. 2. (tied) Valar Atomics, $1B, nuclear power: Valar Atomics, a developer of technology and infrastructure to deliver nuclear energy, closed on $1 billion in Series B funding led by Sequoia Capital. The El Segundo, California-based company also secured a $200 million credit facility led by Erebor and JP Morgan. 4. Lumilens, $700M, AI connectivity: Lumilens, developer of a connectivity platform for AI infrastructure, emerged from stealth and announced more than $700 million in new funding. Atreides Management, Bain Capital Ventures, Meritech Capital, Seligman Ventures and Spark Capital led the financing for the San Jose, California-based startup. 5. Whatnot, $545M, live shopping: Live shopping marketplace Whatnot bagged $545 million in Series G funding. The round reportedly set a $20 billion valuation for the Los Angeles-based company, with Iconiq Capital, Lightspeed Venture Partners and Avra as lead investors. 6. Mariana Minerals, $310M, critical minerals: Mariana Minerals, a software-focused developer of projects for supplying critical minerals, picked up $310 million in Series B financing led by Khosla Ventures. The 4-year-old company engineers, builds and operates mines and refineries using its software platform. 7. Volta, $300M, AI infrastructure: Volta, a developer of AI cloud infrastructure, emerged from stealth and said it raised a Series A at a $2.4 billion valuation, led by Azora, Andreessen Horowitz, Altimeter and Nvidia. 8. Horizon3, $250M, cybersecurity: San Francisco-based cybersecurity provider Horizon3, announced a $250 million Series E. NightDragon and New Enterprise Associates led the round, which set a valuation of more than $2 billion, triple the value set for its Series D last year. 9. LifeMine Therapeutics, $188M, biotech: Watertown, Massachusetts-based drug discovery startup LifeMine Therapeutics secured $188 million in Series E funding led by Milky Way Investments. The funding will go toward clinical development of its lead program and advance its pipeline of transplantation and immunology therapies. 10. HappyRobot, $150M, agentic AI: HappyRobot, developer of an agentic AI platform geared for enterprises in sectors including logistics, financial services, utilities and manufacturing, raised $150 million in Series C funding led by Prysm Capital and Eurazeo. Methodology. Mindstate Design Labs, Inc tracked the largest announced rounds in the Crunchbase database that were raised by U.S.-based companies for the period of Aug. 1-7. Although most announced rounds are represented in the database, there could be a small time lag as some rounds are reported late in the week.

CoreWeave secured a $650 million credit facility in March 2024 to expand its data centre footprint and purchase advanced Nvidia hardware. JPMorgan Chase led the financing, with participation from Blackstone and Magnetar Capital. The GPU-accelerated cloud infrastructure provider plans to use the non-dilutive capital to deploy high-density computing clusters across the United States. The funding allows CoreWeave to acquire expensive Nvidia GPUs without diluting existing shareholders' equity. This facility follows a $2.3 billion debt financing round CoreWeave closed in mid-2023, which used its Nvidia hardware fleet as collateral. The company plans to open multiple new data centres by the end of 2024 to meet growing enterprise demand for generative AI and machine learning compute power.

Hadrian, a defense manufacturer and factory builder, has raised $1.37 billion in Series D funding, valuing the company just below $8 billion. The round was led by JPMorganChase's Strategic Investment Group, with participation from WCM Investment Management, Washington Harbour Partners, Valor Equity Partners, 137 Ventures, and Baillie Gifford. The company produces precision parts and offers factories-as-a-service for aerospace and defense markets, using AI, automation, and robotics alongside skilled workers. Hadrian operates nearly 3 million square feet across four sites. Chief executive Chris Power told Axios the funding reflects growing recognition of domestic manufacturing's importance. Hadrian supplies major defense contractors including Lockheed Martin and RTX, and will mass-produce submarine components for the US Navy in Alabama.