The Week's 10 Biggest Funding Rounds: Safe Superintelligence And Commonwealth Fusion Lead With Billion-Dollar Deals
Another week, another bevy of big rounds. The largest round was a reported $5 billion Nvidia-backed financing for foundational AI unicorn Safe Superintelligence, followed by a $1 billion investment in Commonwealth Fusion Systems. Joanna Glasner jglasner Want to keep track of the largest startup funding deals in 2026 with our curated list of $100 million-plus venture deals to U.S.-based companies?
Key Takeaways
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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 .
- Safe Superintelligence , $5B, foundational AI: AI lab Safe Superintelligence announced a long-term partnership with Nvidia to rapidly accelerate its growth.
The deal reportedly included a $5 billion investment from the chip giant with an eye toward boosting compute resources for Safe Superintelligence, a Silicon Valley startup founded by OpenAI co-founder Ilya Sutskever .
- G2 Venture Partners and Eclipse co-led the financing for the nine-year-old, San Jose-based company.
Antares , $370M, nuclear energy: Antares, a nuclear fission energy company that develops compact microreactors for defense and space applications, raised $370 million in Series C equity funding.
- ThreatLocker , $190M, cybersecurity: Cybersecurity provider ThreatLocker closed on $190 million in Series F funding to hone its platform and expand internationally.
- Seligman Ventures led the financing for the five-year-old Santa Clara, California-based company.
Stats & Key Facts
- #The largest round was a reported $5 billion Nvidia-backed financing for foundational AI unicorn Safe Superintelligence, followed by a $1 billion investment in Commonwealth Fusion Systems.
- #The largest round was a reported $5 billion Nvidia-backed financing for foundational AI unicorn Safe Superintelligence, followed by a $1 billion investment in Commonwealth Fusion Systems.
- #Joanna Glasner jglasner Want to keep track of the largest startup funding deals in 2026 with our curated list of $100 million-plus venture deals to U.S.-based companies?
- #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 .
For this past week, the largest round was a reported $5 billion Nvidia -backed financing for foundational AI unicorn Safe Superintelligence , followed by a $1 billion investment in Commonwealth Fusion Systems . Other sizable rounds went to companies in sectors including energy storage, health testing, nuclear power, fintech, and, yes, AI. Safe Superintelligence , $5B, foundational AI: AI lab Safe Superintelligence announced a long-term partnership with Nvidia to rapidly accelerate its growth.
The deal reportedly included a $5 billion investment from the chip giant with an eye toward boosting compute resources for Safe Superintelligence, a Silicon Valley startup founded by OpenAI co-founder Ilya Sutskever . Commonwealth Fusion Systems , $1 billion, fusion energy: Commonwealth Fusion Systems, a startup working on fusion energy technology and developing a grid-scale fusion power plant, raised $1 billion in fresh funding from unspecified investors. The round brings the total invested to date for the Massachusetts-based company to $4 billion.
Antora Energy , $550M, thermal energy storage: Antora Energy, a company that provides energy through thermal batteries to data centers, announced that it has closed on $550 million in a Series C funding round. G2 Venture Partners and Eclipse co-led the financing for the nine-year-old, San Jose-based company. Function , $450M, health testing: Austin-based Function, a provider of lab testing, imaging, and personal health information that markets to consumers, secured $450 million in growth financing from General Catalyst .
For more details please read the original article at Crunchbase News.
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