Lambda, a provider of AI cloud infrastructure, has raised more than $1.5bn in Series E funding for scaling AI supercomputing infrastructure.

TWG Global, a holding company led by Thomas Tull and Mark Walter, led the round. Thomas Tull’s US Innovative Technology Fund (USIT) also took part in the Series E round alongside various existing investors.

The investment comes as demand for high performance computing (HPC) resources continues to increase and data centre capacity remains limited.

It is expected to expedite Lambda’s efforts to introduce gigawatt-scale AI factories and supercomputers to meet the needs of hyperscalers, enterprises, and frontier labs developing superintelligence.

Lambda co-founder and CEO Stephen Balaban said: “This round of funding helps enable Lambda to develop gigawatt-scale AI factories that power services used by hundreds of millions of people every day.

“Our mission is to make compute as ubiquitous as electricity and bring the power of AI to every person in America. One person, one GPU. It’s a privilege to work with Thomas, USIT, and TWG Global to realise this vision.”

Earlier in February 2025, Lambda closed a $480m Series D fundraising round that was co-led by Andra Capital and SGW.

Other new investors included Andrej Karpathy, ARK Invest, Fincadia Advisors, G Squared, In-Q-Tel (IQT), KHK & Partners, Nvidia, Pegatron, Supermicro, Wistron, and Wiwynn.

Various existing backers such as 1517, Crescent Cove, and USIT also increased their stakes during this round.

Recently, Lambda entered a multi billion dollar agreement with Microsoft to deploy AI infrastructure featuring tens of thousands of Nvidia GPUs, including Nvidia GB300 NVL72 systems.

Founded in 2012 by engineers with research published at NeurIPS and ICCV conferences, Lambda provides supercomputing infrastructure for AI researchers, enterprises, and hyperscale customers.

The company specialises in large-scale AI computing for training and inference workloads.

TWG Global co-chairman and USIT chairman Thomas Tull said: “Since meeting Stephen and the Lambda team several years ago, we have been consistently impressed by their visionary focus and ability to deliver infrastructure at unprecedented scale.

“Generating enough compute power for AI is a defining infrastructure challenge of our time. We believe that Lambda is well-positioned to solve this challenge and continue to deliver in the decades ahead.”