Callosum - About the company
Callosum is a seed company based in London (United Kingdom), founded in 2025 by Jascha Achterberg and Danyal Akarca. It operates as an AI infrastructure company providing systems-level software. Callosum has raised $110M in funding from Atomico and Plural. The company has 1686 active competitors, including 83 funded and 4 that have exited. Its top competitors include companies like LangChain, Relevance AI and TrueFoundry.
Company Details
AI infrastructure company providing systems-level software. It enable AI workloads to run efficiently across diverse chip architectures from various manufacturers, challenging the industry's reliance on homogeneous computing environments. It builds infrastructure where heterogeneous chips and intelligence co-evolve. The company focuses on systems, not models. It unifies disciplines to unlock heterogeneous scale, where chips and compute primitives give rise to systems of intelligence.
- Website
- www.callosum.com/
- Social
- Email ID
- *****@callosum.com
Key Metrics
Founded Year
2025
Location
London, United Kingdom
Stage
Seed
Total Funding
$110M in 4 rounds
Latest Funding Round
Ranked
10th among 1686 active competitors
Employee Count
43 as on Sep 30, 2026
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Callosum's funding and investors
Callosum has raised a total funding of $110M over 4 rounds. Its latest funding round was a Seed round on Aug 20, 2026 for $*****. 6 investors participated in its latest round. Callosum has 11 institutional investors and 3 angel investors.
Here is the list of recent funding rounds of Callosum:
Filter this list
Filter this listDate of Funding | Funding Amount | Round Name | Post-Money Valuation | Revenue Multiple | Lead Investors | Other Investors |
|---|---|---|---|---|---|---|
Aug 20, 2026 | 1134026 | Seed | 7558458 | 8388398 | 4903434 | 7081309 |
Apr 16, 2026 | 8745653 | Seed | 3432365 | 3876704 | 4139906 | |
Feb 26, 2026 | 6258440 | Seed | 6044254 | 4641651 |
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Callosum's founders and board of directors
Founder? Claim ProfileThe founders of Callosum are Jascha Achterberg and Danyal Akarca.
Here are the details of Callosum's key team members:
- Jascha Achterberg: Co-Founder of Callosum. Contact Info: 1 email address
- Danyal Akarca: Co-Founder of Callosum. Contact Info: 1 email address
View details of Callosum's Founder profiles and Board Members
Callosum's employee count trend
Callosum has 43 employees as of Sep 26. Here is Callosum's employee count trend over the years:
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Callosum's Competitors and alternates
Top competitors of Callosum include LangChain, Relevance AI and TrueFoundry. Here is the list of Top 10 competitors of Callosum, ranked by Tracxn score:
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Rank | Company Details | Short Description | Total Funding | Investors | Tracxn Score |
|---|---|---|---|---|---|
1st | LangChain 2022, San Francisco (United States), Series B | Developer of tools for building, testing, and deploying AI agent applications | $260M | 72/100 | |
2nd | Relevance AI 2020, Sydney (Australia), Series B | AI-powered image data analytics platform | $37M | 66/100 | |
3rd |  TrueFoundry 2021, San Francisco (United States), Series A | Provider of an enterprise-grade AI gateway that encompasses LLM gateway, MCP gateway, and agent gateway | $21.3M | 65/100 | |
4th |  Union.ai 2021, Seattle (United States), Series A | Developer of a platform for orchestrating, training, and serving AI | $48.1M | 64/100 | |
5th | Gimlet Labs 1990, San Francisco (United States), Series B | Developer of software to deploy and monitor AI applications across fleets | $392M | 63/100 | |
6th | Provider of AI workload orchestration and GPU management software solutions | $118M | 59/100 | ||
7th | Onyx 2024, New York City (United States), Series B | Provider of a secure control plane for managing AI agents | $153M | 59/100 | |
8th |  Kira 2025, Miami (United States), Seed | Provider of infrastructure for launching embedded fintech products with AI | $8.7M | 59/100 | |
9th | Clarifai 2013, New York City (United States), Acqui-Hired | Provider of AI based image and video recognition solution for multiple industries | $101M | 57/100 | |
10th |  Callosum 2025, London (United Kingdom), Seed | AI infrastructure company providing systems-level software | $110M | 56/100 |
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Callosum's Investments and acquisitions
Callosum has made no investments or acquisitions yet.
Reports related to Callosum
Here is the latest report on Callosum's sector:
News related to Callosum
Media has covered Callosum for a total of 6 events in the last 1 year, 1 of them has been about partnerships.
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AI startup Callosum raises $100M to optimize AI workloadsSiliconAngle•Aug 21, 2026•Callosum, Atomico, Plural, DCVC and 5 others
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Cerebras and Callosum Partner for Ultra-Low-Latency Heterogeneous Agentic InferenceGlobeNewswire•Aug 20, 2026•Callosum, Cerebras
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London-Based Callosum Raises $10.25M Funding Round Led By PluralStartup Rise EU•Feb 26, 2026•Plural, Callosum, Aria, Plural
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