British Business Bank backs UK AI firm with USD $20m

The British Business Bank has invested USD $20 million in Ineffable Intelligence as part of a USD $1.1 billion seed funding round for the UK-headquartered AI company.

The government's Sovereign AI Fund is also participating, adding public backing to what the bank described as the largest seed round raised by a European company.

Other investors include Sequoia, Lightspeed, Nvidia, Index, Google, EQT, Evantic, Flying Fish, DST Global and Bond. The financing gives immediate scale to a company founded to develop what its backers describe as AI systems that learn from experience and generate new knowledge.

Ineffable Intelligence is led by David Silver, a professor at University College London and a prominent reinforcement learning researcher. His previous work includes senior roles on AlphaGo, AlphaZero, AlphaFold and AlphaProof, and he formerly led the reinforcement learning team at Google DeepMind.

Silver founded the company to pursue what it calls a "superlearner" - a system designed to discover knowledge from its own experience rather than relying only on existing human-produced data. The approach places Ineffable within a growing group of frontier AI companies seeking to move beyond large language models trained chiefly on text and other static datasets.

The deal also extends the British Business Bank's recent activity in AI. Over the past 12 months, it has made nine AI investments, including Wayve and PolyAI, and backed almost 24% of university spinout deals between 2022 and 2024.

Public backing

The Sovereign AI Fund's involvement points to a broader UK effort to keep advanced AI companies headquartered domestically as they raise larger sums. The fund is intended to invest directly in UK AI startups and support their growth in Britain.

That emphasis reflects a long-running concern among policymakers that British research strengths often lead companies to move overseas or be acquired by foreign buyers. By backing Ineffable Intelligence alongside major global investors, the state is seeking to keep one of the country's most prominent new AI ventures anchored in the UK.

"David Silver is a generational talent who has consistently been on the cutting edge of AI development. Ineffable Intelligence has the potential to produce a paradigm shift in our scientific and technology landscape, and we are incredibly excited to be supporting him and his team in this endeavour," Charlotte Lawrence, Managing Director of Direct Equity at British Business Bank, said.

"Ineffable Intelligence is aiming to address one of the most significant opportunities within AI, superintelligence, which has the potential to open new frontier applications, including in advanced problem solving and new product development with relevance across sectors. The UK produces world-class AI talent, and we are pleased to back strategically important businesses to scale and stay in the UK," George Mills, Investment Director at British Business Bank, said.

Founding pedigree

Silver's academic and industry record has made him one of the best-known researchers in modern AI, particularly in reinforcement learning, where systems improve through repeated interaction and feedback. The field has underpinned some of the most recognised milestones in AI research, including game-playing systems that defeated top human competitors.

Ineffable says its aim is not simply to reproduce known answers but to develop algorithms that can test ideas, interact with environments and uncover solutions independently. Supporters argue such systems could have applications in scientific research, medicine and engineering if they can move from theory into commercial products.

"Very few founders in the world could credibly set out to build a superlearner - a system that discovers new knowledge from its own experience, rather than ours. David is one of them. From AlphaGo to AlphaZero to AlphaProof, he has spent nearly two decades turning reinforcement learning from a research idea into the results the rest of the field builds on. Ineffable is being built in the UK - and that matters," Josephine Kant, Head of Ventures at Sovereign AI, said.

The funding round stands out not only for its size but also for its list of participants, which spans venture capital firms, strategic investors, and major technology groups. Their involvement suggests strong investor appetite for companies built around a small number of high-profile AI researchers, even at the seed stage.

For the British Business Bank, the transaction adds another large AI bet to a portfolio increasingly shaped by emerging technologies. For the government, it offers an early test of whether direct intervention can help keep advanced AI research, talent and company growth centred in the UK.