Britain and the United States have agreed to a landmark "Tech Prosperity Deal" aimed at deepening cooperation in artificial intelligence, quantum computing, and civil nuclear energy. The pact coincides with U.S. President Donald Trump’s state visit to Britain, where he will be hosted at Windsor Castle by King Charles and the royal family.

As part of the agreement, U.S. tech giants — led by Microsoft, Nvidia, Google, OpenAI, Salesforce, and CoreWeave — pledged over £38 billion ($50 billion) in new U.K. investments. The spending wave will fund advanced supercomputers, energy-efficient data centers, and large-scale AI infrastructure, which officials say will drive growth, scientific research, and energy security across both nations.

Microsoft announced a record £22 billion ($30 billion) investment through 2028, split between capital expansion and U.K. operations. Central to this plan is building Britain’s largest supercomputer in partnership with U.K.-based cloud firm Nscale, powered by more than 23,000 GPUs. The supercomputer will be located in Loughton, northeast London

Microsoft CEO Satya Nadella said the company aims to ensure America remains a “trusted and reliable partner” for Britain. President Brad Smith, once a critic of the U.K.’s regulatory climate, noted his view has shifted: “Just a few years ago, this kind of investment would have been inconceivable. I am very encouraged by the steps that the government has taken.”

Nvidia unveiled plans to invest £11 billion ($15 billion) in Britain, its largest European commitment to date. In partnership with Nscale and CoreWeave, Nvidia will deploy 120,000 cutting-edge GPUs, including Grace Blackwell Ultra chips, across the country. David Hogan, Nvidia’s European enterprise head, said the initiative would “truly make the U.K. an AI maker, not an AI taker.”

Google committed £5 billion ($6.8 billion), including a new data center in Waltham Cross to power services such as Google Cloud, Workspace, and Maps. The company projects the investment will support 8,250 jobs annually.

OpenAI will launch “Stargate U.K.,” a dedicated British arm of its mega AI initiative, in partnership with Microsoft, Nvidia, and Nscale. The project will start with 8,000 GPUs in Newcastle’s Cobalt Park, with potential expansion to 31,000 GPUs.

Salesforce doubled its U.K. commitment to $6 billion, while CoreWeave pledged an additional £1.5 billion ($2 billion), bringing its total to £2.5 billion. CoreWeave will focus on energy-efficient data centers with Scottish partner DataVita.

The deal comes at a pivotal moment for Prime Minister Keir Starmer, who is under pressure to revive Britain’s sluggish economy and attract global investment. Starmer stressed that the agreement could “shape the future of millions of people on both sides of the Atlantic, and deliver growth and security.”

Together, the commitments represent more than $50 billion in U.S.-led investment, a transformative move that cements Britain’s role as a central hub for AI, cloud computing, and next-generation infrastructure.