16646869 · Active · incorporated 1 year, 2 months ago · London
AI B2B Deep Tech Platform SaaS Series B+
Callosum develops AI inference infrastructure and software to optimize AI workloads across different models and chips, serving applications in cybersecurity, finance, and enterprise.
Callosum is a private limited company registered at Companies House under number 16646869, incorporated on 13 August 2025, with a registered office in London. Its current status on the register is active. Its filed nature of business is other research and experimental development on natural sciences and engineering (SIC 72190). Sonde has indexed 20 filings for this company, including 2 funding rounds. Its most recent round closed in July 2026, raising £57.2m.
| Round | Closed | Raised | Price per share |
|---|---|---|---|
| Round 2 | Jul 2026 | £57.2m | £13.21 |
| Round 1 | Mar 2026 | £15.9m | £1.36 |
Showing the 12 most recent of 20 filings.
See the complete cap table with every shareholder, founder tags, dilution across 12 share allotments, round-by-round fundraising history, and the full filing timeline — parsed from official Companies House documents.
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