London-based Callosum raises €85.4 million in Atomico-led Seed round for AI infrastructure
The startup, which builds software to route AI workloads across different models and chips, drew backing from Atomico, Plural, DCVC and the UK Sovereign AI Fund.
AfroEuropa Newsroom
AfroEuropa desk
Callosum, a London-based startup developing infrastructure to link different artificial intelligence models and chips, has raised €85.4 million ($100 million) in a Seed round, according to EU-Startups.
The company describes its focus as "heterogeneous intelligence" and said the funding would support work on how computing is done for the next phase of AI development.
The round was led by Atomico, with participation from Plural, DCVC and the UK Sovereign AI Fund, alongside other investors and angels. The UK government launched its €573 million (£500 million) Sovereign AI initiative in April 2026 to support British AI startups in fields regarded as strategically important for economic growth and national security.
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