Funding

London-Based Callosum Raises $10.25M Funding Round Led By Plural

Feb 26, 2026 | By Kailee Rainse

London-based AI software startup Callosum has closed a $10.25 million funding round led by European early-stage venture firm Plural signalling strong investor interest in multi-chip AI infrastructure at a time when capital remains concentrated around a handful of dominant compute platforms.

SUMMARY

London-based AI software startup Callosum has closed a $10.25 million funding round led by European early-stage venture firm Plural signalling strong investor interest in multi-chip AI infrastructure at a time when capital remains concentrated around a handful of dominant compute platforms.

The round also included backing from the Advanced Research and Invention Agency (ARIA) and angel investors such as Charlie Songhurst, Stan Boland of FiveAI, and John Lazar, a fellow of the Royal Academy of Engineering.

Callosum develops system-level software that enables different chip architectures to work together seamlessly. Rather than relying solely on large, homogeneous GPU clusters its platform orchestrates and balances AI workloads across diverse processors, including alternative accelerators and cloud-native chips.

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Led by Danyal Akarca and Jascha Achterberg, the company operates at the intersection of AI orchestration and heterogeneous hardware scheduling.

Its technology allows AI models to run across mixed hardware environments, enabling more flexible and sovereign infrastructure.

The new funding will primarily support research and development, U.S. market expansion and deeper integration with bespoke hardware aligned to its multi-chip strategy.