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- Callosum
Callosum Funding, Investors & Competitors
Callosum has raised $110M across 3 funding rounds, most recently a $100M seed round in August 2026.
Last Callosum funding round
$100M
Seed · Aug 2026
Cumulative funding Callosum raised
$110M
across 3 funding rounds
Key investors in Callosum
Plural Platform
Sovereign AI Fund
DCVC
Charlie Songhurst
Atomico
Stan Boland
John Lazar
About Callosum
Callosum delivers data analytics, AI, and digital engineering services for data management. Platforms support integration, visualization, ML, cloud solutions, governance, and automation across business functions. Consulting aids digital transformation and system modernization.
Founded
2025
HQ
Website
Status
Privately held
Customer focus
B2B
Revenue model
Services
Callosum Funding History
Callosum has raised a total of $110M across 3 funding rounds.
Callosum's first fundraising round was a $10M pre-seed round in February 2026. The most recent completed round was a $100M seed round in August 2026.
Callosum funding rounds
| Date | Stage | Investors | Raised | Deal Summary |
|---|---|---|---|---|
| Aug 2026 | Seed | Atomico (lead); Plural Platform; Sovereign AI Fund; DCVC | $100M | Atomico led Callosum’s $100 million seed round in August 2026, with participation from Plural, DCVC, and the UK Sovereign AI Fund. The financing was described as one of the largest seed rounds in Europe and included a significant investment from the UK government-backed Sovereign AI Fund. Callosum builds software that matches AI tasks to different models and chips, aiming to reduce compute costs and improve performance for heterogeneous AI workloads. The company said the new capital will support scaling its infrastructure and expanding partnerships across the AI compute stack. Callosum is a London-based AI infrastructure startup founded in 2025; it had previously raised a $10 million pre-seed round in February 2026. Public descriptions of the company emphasize its platform for routing work across models, chips, and infrastructure to make AI compute more efficient. |
| Apr 2026 | Seed | Sovereign AI Fund (lead) | - | - |
| Feb 2026 | Pre-seed | Plural Platform (lead); Stan Boland; John Lazar; Charlie Songhurst | $10M | - |
Who has invested in Callosum?
7 investors have backed Callosum across its funding rounds, including Plural Platform, Sovereign AI Fund, DCVC, Charlie Songhurst, Atomico and Stan Boland.
Lead investors include Atomico, Sovereign AI Fund and Plural Platform.
Callosum Investors
| Investor | HQ | Rounds | Role | First check |
|---|---|---|---|---|
| 2 | Lead | Feb 2026 | ||
| 2 | Lead | Apr 2026 | ||
| 1 | Participant | Feb 2026 | ||
| 1 | Participant | Aug 2026 | ||
| 1 | Participant | Feb 2026 | ||
This data is available for Pro users. Sign up to see all 7 Callosum investors. Start Free Trial | ||||
Benchmark 350K+ Funding Rounds and Disclosed VC Valuation Multiples
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Start Free TrialCallosum Competitors
Callosum competitors include listed companies like Palantir, ServiceNow, Datadog and RELX, and private ones like ClickHouse and Celonis.
| Company | HQ | Status | Revenue | EBITDA | Valuation | Revenue Multiple |
|---|---|---|---|---|---|---|
| Publicly listed | $4.5B | $1.5B | $424B | 58.1x | ||
| Publicly listed | $13B | $2.6B | $143B | 9.6x | ||
| Publicly listed | $3.4B | ($588K) | $85B | 19.4x | ||
| Publicly listed | $13B | $4.9B | $59B | 5.3x | ||
| Private | $160M | - | $15B | 93.8x | ||
| Private | $400M | - | $13B | 32.5x |
Callosum Public Comps
Callosum is still privately-owned, but its public comps include Palantir, ServiceNow, Datadog, RELX, Strategy, Verisk Analytics, Fair Isaac, Wolters Kluwer, Dynatrace and Elastic.
| Last FY | EV/Revenue | EV/EBITDA | ||||||
|---|---|---|---|---|---|---|---|---|
| Revenue | EBITDA | Last FY | LTM | 2027E | Last FY | LTM | 2027E | |
| $4.5B | $1.5B | 92.6x | 58.1x | 285.0x | 97.4x | |||
| $13B | $2.6B | 11.1x | 9.6x | 57.2x | 25.0x | |||
| $3.4B | ($588K) | 23.6x | 19.4x | (137813.0x) | 77.6x | |||
| $13B | $4.9B | 5.5x | 5.3x | 14.4x | 13.2x | |||
| $477M | ($5.4B) | 149.4x | 144.4x | (13.1x) | (12.3x) | |||
| $3.1B | $1.7B | 8.8x | 8.5x | 16.2x | 15.1x | |||
| $2B | $951M | 13.2x | 10.4x | 27.6x | 17.1x | |||
| $7.1B | $2.5B | 3.2x | 3.1x | 8.9x | 9.3x | |||
This data is available for Pro users. Sign up to see all Callosum competitors and their valuation data. Start Free Trial | ||||||||
Common questions about Callosum
| When was Callosum founded? | Callosum was founded in 2025. |
| Where is Callosum headquartered? | Callosum is headquartered in London, United Kingdom. |
| Is Callosum publicly listed? | No, Callosum is a private, VC-backed company. |
| How much funding has Callosum raised? | Callosum has raised $110M across 3 funding rounds. |
| What was Callosum's last funding round? | Callosum's last funding round was a $100M seed round in August 2026, led by Atomico. |
| Who are Callosum's investors? | Callosum's investors include Plural Platform, Sovereign AI Fund, Stan Boland, DCVC, John Lazar, Charlie Songhurst and Atomico. |
| Which companies are comparable to Callosum? | Companies comparable to Callosum include Palantir, ServiceNow, Datadog, RELX, ClickHouse and Celonis. |
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