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Callosum raises $100 million seed funding led by Atomico to support its AI infrastructure platform

Funding Provisional 90% confidence first seen

Callosum, a UK AI software infrastructure startup, raised a $100 million seed round led by Atomico, following an earlier $10.25 million pre-seed. The funding is intended to support its platform for running AI workloads across different chips and models, including work associated with a Cerebras partnership mentioned in the coverage.

Callosum Tailored Inference Atomico Cerebras Cerebras WSE-3 Turbo DCVC GPT-5.6 Luna Plural U.K. Sovereign AI Fund

The deal

Callosum $100 million Seed · announced 20 Aug 2026

Investors Atomico

Deal terms as reported in the coverage below.

Source coverage

Callosum raises $100M led by Atomico in one of Europe’s largest seed rounds Tech Funding News independent Callosum raises $100M seed round Tech.eu independent AI workload optimization startup Callosum raises $100M SiliconANGLE independent

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