In a week marked by exceptionally large funding deals, US startups in artificial intelligence, space propulsion, and enterprise finance attracted over a billion dollars collectively, led by a $750 million round for spend-management platform Ramp.
- Ramp closes $750M round at $44B valuation
- Three $500M rounds fuel AI and space tech growth
- Fusion energy and longevity medicine startups also attract significant capital
What happened
US startups attracted significant venture capital this week, with the ten largest funding rounds all exceeding $300 million. Leading the pack was Ramp, a finance software company specializing in spend management, which raised $750 million. This financing round was led by notable investors including Iconiq, GIC, and Ontario Teachers’ Pension Plan, catapulting Ramp’s valuation to $44 billion.
In addition to Ramp, three other startups secured $500 million each. Impulse Space, focused on spacecraft and propulsion systems, raised $500 million in Series D funding led by 137 Ventures and Banner VC. Supabase, offering an open-source platform for AI app developers, also raised $500 million with GIC leading the round, achieving a $10.5 billion valuation. Flourish, which develops AI models based on human brain architecture, pulled in $500 million from investors such as Jeff Bezos and Google Ventures.
Why it matters
These mega-rounds reflect investors’ confidence in sectors poised for transformative growth. AI’s expanding role in software development, robotics, and creative industries like music is driving massive capital inflows. Space technology is also gaining momentum as companies pursue increasingly ambitious projects related to spacecraft propulsion and orbital maneuvering.
Notably, strategic investors such as pension funds and major venture capital firms are backing these companies, indicating a long-term belief in their market potential. Beyond AI and space tech, significant funding rounds in fusion energy and longevity medicine highlight the broad spectrum of groundbreaking technologies attracting substantial investment.
What to watch next
It will be important to monitor how these companies deploy their capital to advance product development and scale operations, especially Ramp, which now stands at a $44 billion valuation. The performance of AI startups like Supabase and Flourish will be closely watched for how they leverage their sizable funding to innovate within increasingly competitive markets.
Additionally, emerging sectors like fusion power and biomedical longevity research are drawing heightened attention from investors, with Helion and NewLimit raising hundreds of millions. Keeping an eye on technological progress and commercialization milestones in these fields will be critical for understanding broader shifts in venture capital priorities throughout 2026.