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Callosum raises $100m seed led by Atomico to tackle AI compute bottlenecks

Published

20 August 2026

Topic

technology

Sectors

AI Infrastructure

Geography

United Kingdom

Source

Read at sifted.eu

Verified

Fusion42 · 20 August 2026 · Fusion42 review

Callosum, a UK-based AI infrastructure startup, raised a $100m seed round led by Atomico and supported by Plural and the UK Sovereign AI Fund to develop a platform that optimizes AI workloads across different models and chip providers, aiming to reduce compute costs and address AI hardware bottlenecks. The startup aligns with the UK government's £1.1bn AI hardware plan and has formed strategic partnerships with semiconductor companies like Cerebras and Rebellions.

This Wire brief sits within Fusion42's coverage of AI Infrastructure.

◆ The Wire takeaway

You face new pressure to enable AI that runs efficiently across multiple chip providers as UK government support reinforces local hardware ambitions. Your software must now plug into diverse AI chip ecosystems or risk missing out on access and cost advantages.

Coverage

1 source · 20 Aug 2026

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Topics

AI Infrastructureai-infrastructurecompute-optimizationstrategic-partnershipsseed-fundinguk-sovereign-ai-fund