AI/Fastest growing

Callosum

Software that splits AI workloads across many different chip types to run them faster and cheaper.

Why it's here

Raised a $100M seed led by Atomico with Plural, DCVC and the UK Sovereign AI Fund in August 2026, six months after a $10.25M pre-seed.

Focus: AI Compute Orchestration
Founded: 2024
Total raised: $110Msource: kucoin.com
Latest round: Seed, $100M, Aug 2026
Registered office: 56 Leman Street, London, Tower Hamlets E1 8EUsource: find-and-update.company-information.service.gov.uk
London presence: HQsource: jobs.ashbyhq.com
Investors: Atomico (lead), DCVC, Plural, UK Sovereign AI Fundsource: callosum.com
Area: Aldgate & Whitechapel
Nearest station: Aldgate East, 263 m
Companies House: CALLOSUM LTD (16076949, active)Incorporated 13 Nov 2024 · SIC 72190
Hiring: 13 open roles in London ↗Public job board, checked 9 Oct 2026
Work model: On-site (from 13 London job posts)Current job posts only, checked 9 Oct 2026. Howsource: jobs.ashbyhq.com
Visas: Licensed visa sponsor, listed as Callosum Ltdsource: gov.uk
Elsewhere: LinkedIn ↗X ↗

For Callosum