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Ineffable Intelligence

Raised $1.1B in a Seed round, announced 27 April 2026.

Round

Ineffable Intelligence, a London AI startup, raised a $1.1B seed round.

Amount: $1.1B
Stage: Seed
Announced: 27 April 2026
Leads: Sequoia Capital, Lightspeed
Other investors: Nvidia, Google, DST Global, Index, Sovereign AI Fund, British Business Bank
Checked: Amount and date matched across 3 press sources

Company

Developing AI systems that learn without human data, founded by a former DeepMind researcher.

Based in: London, United Kingdom
Founded: 2025
Sector: AI
Website: ineffable.ai ↗

Founder

David SilverfounderLinkedIn ↗

Sources and links

Sources: Ineffable Intelligence lands historic $1.1 billion Seed round at $5.1 billion valuation - EU-Startups news.google.com
Ex-DeepMind researcher raises $1.1B seed round for London AI startup Ineffable Intelligence - Quartz news.google.com
DeepMind’s David Silver just raised $1.1B to build an AI that learns without human data - TechCrunch news.google.com
Website: ineffable.ai ↗
LinkedIn: David Silver ↗

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