Key facts
- It has raised $10.3M; the latest was Early Stage VC ($10.3M) in Feb 2026.
- Notable investors include Entrepreneurs First, Charles Songhurst, Plural, Bare Metal Ventures, John Lazar — 7 tracked in total.
- Status: Privately Held (backing).
- ·The complete investor list — 7 names
- ·Watchlist + deal alerts for Callosum
- ·The full record, as it builds
Funding rounds
No funding rounds for Callosum are on record yet — either the company hasn't raised institutional capital, or the raise hasn't surfaced in our sources.
About Callosum
Developer of AI-oriented compute-infrastructure technology intended to co-evolve specialized chips and intelligence systems. The company's platform focuses on scheduling and optimizing AI workloads across diverse hardware while pursuing advancements such as multi-cloud and multi-chip collaboration, photonic interconnect research, and hardware infrastructure development, enabling enterprise and data center markets to achieve higher computational efficiency, reduced costs, and improved model performance outcomes.
- Sector
- Information Technology
- HQ
- London, United Kingdom
- Founded
- 2024
- Employees
- 14
- Website
- callosum.com/
- Ownership
- Privately Held (backing)
Callosum doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Callosum shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Callosum in its N-PORT filings yet. We sweep new filings monthly.