Legendary ex-Google researcher David Silver eyes $1 Billion seed round at $4 Billion valuation for London AI startup firm
David Silver, the pioneering British AI researcher best known for leading the teams that created AlphaGo – the first system to defeat a world champion in the ancient board game Go – and contributing to breakthroughs like AlphaStar and aspects of Google’s Gemini models, is in talks to raise a staggering $1 billion in seed funding for his new venture, Ineffable Intelligence.
The deal, if completed, would shatter records as Europe’s largest-ever seed round and value the fledgling London-based startup at approximately $4 billion pre-money, according to people familiar with the matter who spoke to the Financial Times.
The publication reports that Sequoia Capital is leading the round, with partners Alfred Lin and Sonya Huang reportedly traveling to London to meet Silver shortly after his departure from Google DeepMind late last year.
Nvidia, Google, and Microsoft have also expressed interest in participating, sources told the FT and other outlets including Sifted and Tech Funding News.
The fundraising underscores the ferocious investor appetite for elite AI talent, even at the seed stage , amid the global race to build next-generation “superhuman” intelligence.
Silver, who is also a professor at University College London, left DeepMind after more than a decade where he helped establish reinforcement learning as a cornerstone of modern AI.
His work demonstrated how agents could master complex tasks through trial-and-error interaction with environments rather than relying solely on massive pre-training datasets, an approach that Ineffable Intelligence appears poised to advance further.
The startup, incorporated in November 2025 with Silver appointed as director in January 2026, aims to develop “superhuman intelligence” capable of endless, self-directed learning and discovering foundational knowledge autonomously.
Details on the exact technical roadmap remain scarce, but the ambition aligns with Silver’s long-standing focus on reinforcement learning and scalable, experience-driven AI systems.
For London and the broader European tech scene, the news arrives as a major vote of confidence.
While the continent has lagged Silicon Valley in producing trillion-dollar AI companies, a deal of this magnitude could accelerate the buildout of deep-tech talent clusters and challenge the narrative that groundbreaking AI must originate in California.
