Callosum
Summary active Updated Aug 31, 2026This profile is AI-generated. If you spot an error, please help us fix it by sharing a URL to the correct information.
Investors
Founders
About
Callosum is a London-based AI infrastructure startup building software that routes AI workloads across heterogeneous chips and models, matching tasks to hardware based on cost, speed and energy efficiency 123. Founded in 2025 by Cambridge neuroscientists Danyal Akarca and Jascha Achterberg, the company frames its work as a counter-thesis to the “monoculture” bet that superintelligence will come from a single frontier model on identical chips 12.
On August 20, 2026, Callosum announced a $100 million (approximately €85.4 million) seed round led by Atomico, with participation from Plural, DCVC, the UK Sovereign AI Fund and angel investors 123. The round was widely characterised as one of the largest seed rounds ever raised in Europe 13. It follows a $10.25 million seed round in February 2026 when the company came out of stealth, bringing total capital raised to over $110 million 23.
Disclaimer: This is a lean profile built from initial round coverage and may be expanded as more information becomes available.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2026-08-20 | Seed | $100M (€85.4M) | Atomico | Plural, DCVC, UK Sovereign AI Fund 123 |
| 2026-02 | Seed | $10.25M | — | — 23 |
What Investors Say
No independently sourced investor quotes available at this time.
What Founders Say
No independently sourced founder quotes beyond the round announcement itself available at this time.
Sources
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Tech.eu, “Callosum raises $100M seed round,” August 20, 2026, accessed August 2026. https://tech.eu/2026/08/20/callosum-raises-100m-seed-round/↩↩↩↩↩
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Dealroom, “Callosum raises $100M in one of Europe’s largest seed rounds,” August 2026, accessed August 2026. https://dealroom.co/news/145986-callosum-raises-100m-in-one-of-europes-largest-seed-rounds/↩↩↩↩↩↩
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Callosum company blog, “$100M Seed to Redefine How Humanity Computes,” August 2026, accessed August 2026. https://www.callosum.com/blog/seed-round↩↩↩↩↩↩