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

Callosum Overview

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

United KingdomLondon

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

Callosum funding rounds
DateStageInvestorsRaisedDeal Summary
Aug 2026SeedAtomico (lead); Plural Platform; Sovereign AI Fund; DCVC$100MAtomico 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 2026SeedSovereign AI Fund (lead)--
Feb 2026Pre-seedPlural 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

Investors in Callosum by funding rounds participated
InvestorHQRoundsRoleFirst check
Plural PlatformUnited KingdomLondon2LeadFeb 2026
Sovereign AI FundUnited KingdomLondon2LeadApr 2026
Stan BolandUnited KingdomBasingstoke1ParticipantFeb 2026
DCVCUnited StatesUnited States1ParticipantAug 2026
John LazarUnited KingdomLondon1ParticipantFeb 2026

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Callosum Competitors

Callosum competitors include listed companies like Palantir, ServiceNow, Datadog and RELX, and private ones like ClickHouse and Celonis.

Public and private companies comparable to Callosum
CompanyHQStatusRevenueEBITDAValuationRevenue Multiple
PalantirUnited StatesUnited StatesPublicly listed$4.5B$1.5B$424B58.1x
ServiceNowUnited StatesUnited StatesPublicly listed$13B$2.6B$143B9.6x
DatadogUnited StatesUnited StatesPublicly listed$3.4B($588K)$85B19.4x
RELXUnited KingdomUnited KingdomPublicly listed$13B$4.9B$59B5.3x
ClickHouseUnited StatesSan Francisco, CAPrivate$160M-$15B93.8x
CelonisGermanyMunichPrivate$400M-$13B32.5x

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 FYEV/RevenueEV/EBITDA
RevenueEBITDALast FYLTM2027ELast FYLTM2027E
Palantir$4.5B$1.5B92.6x58.1x285.0x97.4x
ServiceNow$13B$2.6B11.1x9.6x57.2x25.0x
Datadog$3.4B($588K)23.6x19.4x(137813.0x)77.6x
RELX$13B$4.9B5.5x5.3x14.4x13.2x
Strategy$477M($5.4B)149.4x144.4x(13.1x)(12.3x)
Verisk Analytics$3.1B$1.7B8.8x8.5x16.2x15.1x
Fair Isaac$2B$951M13.2x10.4x27.6x17.1x
Wolters Kluwer$7.1B$2.5B3.2x3.1x8.9x9.3x

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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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