Where is Callosum located?

Callosum is headquartered in London, United Kingdom.

How many employees does Callosum have?

As of Aug 31, 2026, the latest employee count at Callosum is 41.

Is Callosum a funded company?

Callosum is a funded company, having raised a total of $110M across 4 funding rounds to date. The company's 1st funding round was a $***** Seed round.

When was the latest funding round of Callosum?

Callosum's latest funding was a $***** Seed round on Aug 20, 2026, with participation from 6 investors.

Where does Callosum rank among its competitors?

Callosum ranks 19th amongst 1144 active competitors, of which 68 are funded. It stands 3rd in terms of total funding among its competitors. The most recent competitor to raise funding was Callosum, which secured an undisclosed amount in Apr, 2026.

Who are the top competitors of Callosum?

Callosum's top competitors include LangChain, Clarifai and Relevance AI. Among them, Callosum secured the most recent funding round in August, 2026.

Callosum - 2026 Company Profile, Team, Funding & Competitors

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 Plural. The company has 1144 active competitors, including 68 funded and 3 that have exited. Its top competitors include companies like LangChain, Clarifai and Relevance AI.

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

Seed, Aug 20, 2026, $*****

Investors

Plural & 6 more

Ranked

19^th among 1144 active competitors

Employee Count

41 as on Aug 31, 2026

Similar Companies

LangChain & 245 more

View Callosum's full profile

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 4 institutional investors and 3 angel investors.

Here is the list of recent funding rounds of Callosum:

Filter this list

Date of Funding	Funding Amount	Round Name	Post-Money Valuation	Revenue Multiple	Lead Investors	Other Investors
Aug 20, 2026	2690441	Seed	7045115	7324210	7853633	3214168
Apr 16, 2026	6401077	Seed	6021726	1868857	4865725	Gov
Feb 26, 2026	9291777	Seed	8499210	2796484	Plural	Charlie Songhurst & 3 more

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View details of Callosum's funding rounds and investors

The 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 41 employees as of Aug 26. Here is Callosum's employee count trend over the years:

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Top competitors of Callosum include LangChain, Clarifai and Relevance AI. Here is the list of Top 10 competitors of Callosum, ranked by Tracxn score:

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	Sequoia Capital, Benchmark & 13 others	70/100
2nd	Clarifai 2013, New York City (United States), Series C	Provider of AI based image and video recognition solution for multiple industries	$101M	New Enterprise Associates, Deep Learning ... & 19 others	68/100
3rd	Relevance AI 2020, Sydney (Australia), Series B	AI-powered image data analytics platform	$37M	Bessemer Venture Partners, King River & 5 others	66/100
4th	Run:AI 2018, Tel Aviv (Israel), Acquired	Provider of AI workload orchestration and GPU management software solutions	$118M	TLV Partners, Insight Partners & 3 others	63/100
5th	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	Eniac Ventures, Peak XV Partners & 14 others	62/100
6th	Union.ai 2021, Seattle (United States), Series A	Developer of a platform for orchestrating, training, and serving AI	$48.1M	New Enterprise Associates, Mozilla Ventures ... & 1 others	62/100
7th	Parasail 2004, San Mateo (United States), Series A	Provider of a distributed inference network for artificial intelligence workloads	$42M	Touring Capital, Kindred Ventures & 7 others	56/100
8th	Onyx 2024, Israel, Series A	Provider of a secure control plane for managing AI agents	$40M	Conviction, Cyberstarts	55/100
9th	Kira 2025, Miami (United States), Seed	Provider of infrastructure for launching embedded fintech products with AI	$8.7M	Stellar, Rockstart & 5 others	54/100
10th	EdgeRunner AI 2024, San Francisco (United States), Series A	Developer of domain-specific artificial intelligence agents for military and enterprise	$17.5M	Four Rivers Group, Madrona & 2 others	54/100
19th	Callosum 2025, London (United Kingdom), Seed	AI infrastructure company providing systems-level software	$110M	Plural, Gov & 5 others	55/100