Callosum
PrivateLast Round
Seed
Aug 20, 2026
Total Funding Raised
$110.25M
Momentum
Top 1%
of companies Caplight tracks
Company Overview
Callosum is an AI infrastructure company that develops systems-level software enabling AI workloads to run efficiently across diverse chip architectures.
Sector
AI, Data & Cloud Infrastructure
Verticals
AI Training Infrastructure, Cloud Infrastructure, Computing Hardware
Business Model
B2B
Customer Profile
Subscription SaaS, Services & Consulting
AI Layer
Infrastructure
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Callosum Comparables
Compare Callosum with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| SkyPilot | 83% | |
| Heterocore | 83% | |
| FlexAI | 79% |
Callosum Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Seed | Aug 20, 2026 | ||||
| Pre Seed | Feb 26, 2026 |
Callosum Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| UK Department for Science, Innovation and Technology | Seed |
| Advanced Research and Invention Agency | Pre Seed |
| Plural | Seed, Pre Seed |
| Atomico | Seed |
| Entrepreneurs First | Pre Seed |
| Dunamu & Partners | Seed |
| Plural | Seed, Pre Seed |
Market signals
Structured signals derived from secondary market and firmographic data.
- Aug 20, 2026
$100M round led by Atomico.
- Feb 26, 2026
$10.25M round led by Plural
Recent news
Latest coverage and updates
- receives_financingAug 23, 2026
Callosum Technologies Ltd. received financing of $77.9M in Seed 2 on Aug 23rd '26.
- is_developingAug 21, 2026
Callosum Technologies Ltd. is developing programmable heterogeneity and Tailored Inference technology on Aug 20th '26.
- partners_withAug 20, 2026
Callosum Technologies Ltd. partners with Axelera AI.
- receives_financingAug 20, 2026
Callosum Technologies Ltd. received financing of $10.3M in Pre Seed on Feb 1st '26.
- is_developingAug 20, 2026
Callosum Technologies Ltd. is developing Tailored Inference platform.
Callosum Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
Request accessFrequently Asked Questions
Common questions about Callosum's valuation, stock price, and market status.
Is Callosum a public or private company?
Callosum is a private company.
What is the current stock price of Callosum?
Callosum is a private company with no public stock price. No recent secondary market data is available.
How much is Callosum worth (valuation)?
Valuation information for Callosum is not publicly available.
Can I buy Callosum stock?
Callosum shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors. Visit https://www.caplight.com to learn more.
When was Callosum's last funding round?
Callosum's most recent funding round was Pre Seed on February 26, 2026.
Who are the main investors in Callosum?
Key investors in Callosum include Plural.
Will Callosum IPO soon?
No public IPO plans have been announced for Callosum.
How can I track Callosum secondary market activity?
Caplight tracks bids, offers, and trades for private companies. Visit https://www.caplight.com to monitor Callosum's secondary market activity and sign up for updates.