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Callosum raises $100M in a seed round led by Atomico with participation from Plural, DCVC, and others. The funding will support the development of innovative AI software infrastructure.

PRIVATEAug 20, 2026

Amount Raised

$100 Million

Round Type

Seed

Greater LondonSoftwareArtificial IntelligenceMachine Learning

Investors

Sovereign AIDcvcPluralAtomico

Description

Callosum, a UK AI startup, has raised $100M in a high-value seed round to build software infrastructure for diverse AI workloads. The round was led by European VC Atomico, with significant participation from Plural, DCVC, and other investors. Previously, Callosum raised $10.25M in February. The company aims to challenge prevailing AI models with a more heterogeneous approach.

Who else raised in Software and Artificial Intelligence around the same time

Companies in the same sectors as Callosum that raised within 45 days of this round, from Fundz verified event records.

  • Extend Robotics raised $3.3M (Seed) on October 3, 2026.
  • S innovations raised $2.3M (Pre-Series A) on October 2, 2026.
  • Bodhium Labs raised $3.5M (Pre-Seed) on October 2, 2026.
  • Satlyt raised $8M (Seed) on October 1, 2026.
  • enso raised $15M (Series A) on October 1, 2026.
  • Larridin raised $17M (Seed) on October 1, 2026.

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Company Information

Company

Callosum

Location

Greater London, England, United Kingdom

About

Callosum is a London-based startup founded by two Cambridge-trained neuroscientists. The company is focused on building software that orchestrates AI workloads across various chip types to challenge the industry's reliance on identical Nvidia GPUs. Their platform aims to integrate diverse chip technologies to enhance performance and efficiency in AI computing. Callosum's innovative approach is based on principles derived from neuroscience, promoting collaboration among different specialized systems.

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Callosum raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.

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