Funding · Seed · 21 August 2026
Callosum raises £73.5m led by Atomico
London-based Callosum has raised £73.5m in a seed round, led by Atomico. It builds software that sends each AI task to the most cost-efficient model and hardware. Plural, DCVC and UK Sovereign AI Fund also invested.
100thRound size percentile, 37 seed rounds
Press report
CompanyCallosum
StageSeed
SectorAI
Based inLondon
InvestorsAtomico, Plural, DCVC, UK Sovereign AI Fund
SourcePress · confidence highView source ↗
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