How much did Callosum raise?

Callosum raised €85.4M at Seed, announced 20 August 2026.

Who founded Callosum?

Jascha Achterberg is Co-founder of Callosum.

FundedStartupsDaily / AI & Machine Learning / Callosum

Callosum raises €85.4M

Q: What does Callosum do?

Callosum operates in AI & Machine Learning and is based in United Kingdom.

Callosum announced a Seed round of €85.4M on 20 August 2026. The company operates in AI & Machine Learning and is based in United Kingdom. It was founded by Jascha Achterberg, Co-founder.

Raised

€85.4M

Stage

Seed

Industry

AI & Machine Learning

Country

United Kingdom

Founder

Jascha Achterberg

Co-founder, Callosum

LinkedIn profile callosum.com

Outreach angles

-Co-founded Callosum with Danyal Akarca to build infrastructure that routes AI workloads across diverse models and chips.
-Raised one of Europe's largest ever seed rounds, closing $100M (€85.4M) led by Atomico just as the company came out of stealth.
-Atomico CEO Niklas Zennstrom personally backed the thesis that efficient inference routing, not just bigger models, is the next AI infrastructure battleground.