Safe Superintelligence funding leads U.S. startup megadeals
A reported $5 billion Nvidia investment in Safe Superintelligence topped a week of large U.S. startup rounds, according to Crunchbase.
By Marcus Adeyemi · Startups Editor
· 3 min read
Safe Superintelligence funding led the latest U.S. startup megadeal tally, with TechCrunch reporting that Nvidia put $5 billion into the AI lab as part of a long-term strategic partnership. Crunchbase ranked that deal ahead of a $1 billion financing for Commonwealth Fusion Systems, a sign that the largest private-market checks are still clustering around compute-heavy AI and energy infrastructure.
Safe Superintelligence, the Silicon Valley company founded by OpenAI co-founder Ilya Sutskever, announced the Nvidia partnership and said it is intended to accelerate the company’s growth. TechCrunch reported the financing amount and said the investment is aimed at expanding compute resources. No valuation was disclosed for the deal.
What were the biggest startup funding rounds this week?
Crunchbase’s weekly list of the 10 largest announced U.S. rounds included two billion-dollar financings and eight other rounds of at least $145 million:
Safe Superintelligence: $5 billion reported investment from Nvidia tied to a long-term partnership for the foundational AI startup. The company did not disclose a valuation in the announcement cited by Crunchbase.
Commonwealth Fusion Systems: $1 billion for the Massachusetts fusion energy company, which is developing a grid-scale fusion power plant. Crunchbase said the investors were not specified and that the round brings total funding to $4 billion.
Antora Energy: $550 million Series C for the San Jose company, which sells thermal battery systems for data center energy use. G2 Venture Partners and Eclipse co-led the round.
Function: $450 million in growth financing from General Catalyst. The Austin company offers consumer-facing lab testing, imaging and personal health data services.
Antares: $370 million in Series C equity, plus $100 million in debt, for compact nuclear fission microreactors aimed at defense and space uses. Paradigm and Caffeinated Capital led the equity round.
Simile: More than $200 million for AI simulation tools at a $2 billion post-money valuation. Greenoaks led the round, which came five months after the Palo Alto company launched its product. A post-money valuation is the company value after the new capital is included.
ThreatLocker: $190 million Series F for the Orlando cybersecurity company. Elephant led the round, which the company plans to use to improve its platform and expand outside the U.S.
CAIS: $170 million Series D for the New York alternative investment platform serving independent financial advisers. Vista Equity Partners led the round, valuing the company at more than $2 billion.
PEX: $160 million in equity and debt financing. Bluff Point Associates led the round for the company, which provides prepaid and charge cards for businesses and financial tracking tools.
Eliyan: $145 million Series C for AI infrastructure connectivity technology. Seligman Ventures led the financing, which valued the five-year-old Santa Clara company at $1 billion.
Why did AI and energy dominate the list?
The largest financings were tied to two bottlenecks in the current technology buildout: compute and power. Nvidia’s reported investment in Safe Superintelligence fits the chipmaker’s broader position as a key supplier to AI labs, while Commonwealth Fusion, Antora and Antares show investor appetite for companies promising new energy sources or storage capacity.
The week’s AI label covered several different businesses rather than one product category: a foundational AI lab, simulation software, infrastructure connectivity and an AI-enabled corporate card provider. Crunchbase also included cybersecurity, health testing and fintech rounds, but the largest checks went to companies whose plans require significant capital before commercial outcomes are clear.
Several companies disclosed valuations, including Simile, CAIS and Eliyan. Others did not. That leaves the headline funding totals visible, while the pricing and ownership dilution behind many of the week’s largest private deals remain undisclosed.
This story draws on original reporting from Crunchbase News.
