UK AI Companies

Nscale

nscale.com

London-headquartered AI hyperscaler building GPU data centres in the UK. Deploying 60,000 NVIDIA GPUs in the UK and partnering with OpenAI on Stargate UK.

Cosine

cosine.sh

The Sovereign AI Lab. Trains AI models and specialised coding agents for organisations that need frontier capability within secure environments. Public cloud, managed single-tenant, and fully air-gapped deployments. Clients include BT, HSBC, Lloyds, Leonardo, QinetiQ, and Vodafone. London-based.

Fractile

fractile.ai

London-based developer of data-centre inference accelerators for large models. Engineering sites in London and Bristol.

Hostcomm OnshoreAI

hostcomm.co.uk/solutions/uk-sovereign-ai

UK-sovereign open-source LLM inference API running entirely in AWS London (eu-west-2). GDPR and PCI DSS Level 1 compliant. Trading since 2004.

Faculty

faculty.ai

London applied-AI firm delivering decision systems for UK government, NHS and defence.

Cortex Labs

cortex-labs.ai

Frontier AI capability with absolute confidentiality and attribution protection. Three products: Arc (confidential AI chat and document intelligence), Vantage (agentic analytics), and Palisade (sovereign AI for classified defence environments). Cyber Essentials Plus certified, Defence Cyber Certification, GCA supplier. London-based.

NexGen Cloud

nexgencloud.com

UK-based GPU-as-a-service provider offering dedicated VMs and AI workload support in local data centres.

Radiant

ori.co

London GPU cloud offering serverless inference and dedicated clusters for AI teams.

Doubleword

doubleword.ai

Inference cloud for high-volume async and batch LLM workloads. OpenAI-compatible API serving open-weight models (DeepSeek, Qwen, Llama, Mistral). SOC 2 and ISO 27001. London-based, company no. 13353288.

Quantexa

quantexa.com

London decision-intelligence platform for financial crime, fraud and data resolution.

Speechmatics

speechmatics.com

Cambridge-built speech recognition and voice AI, deployable on-prem or air-gapped.

Synthesia

synthesia.io

London AI video generation platform for enterprise communications and training.

Stability AI

stability.ai

London developer of open-weight generative models for image, video and audio.

Optellum

optellum.com

Oxford spin-out whose lung cancer prediction AI is the first FDA-cleared and reimbursed software-as-a-medical-device for lung cancer prioritisation. Now in NHS deployment at Guy's and St Thomas'.

Adarga

adarga.ai

London company founded 2016 building information-intelligence AI for defence and national security. Holds an expanded multi-year MoD Defence Support contract for its Vantage software.

AI Score

aiscore.ai

Intelligence-led AI governance platform. A single platform to control risk and accelerate value at the speed AI demands. Built by teams with backgrounds in national security, finance and law.

Kao Data

kaodata.com

UK-founded and operated data-centre company specifically engineered for AI and HPC workloads. NVIDIA DGX-Ready facilities with high-performance cooling and power infrastructure.

Graphcore

graphcore.ai

Bristol-based designer of AI accelerators (IPUs), with a new data-centre inference chip in development. UK-operating but owned by SoftBank of Japan.

PolyAI

poly.ai

London-built voice assistants for enterprise customer service.

Wayve

wayve.ai

London developer of embodied AI for self-driving vehicles.

PhysicsX

physicsx.ai

London-based company building an AI-native engineering platform for aerospace, defence, semiconductors, automotive and materials science.

Luminance

luminance.com

Cambridge-registered UK AI company specialising in legal AI. ISO 27001 and SOC 2 certified.

Brainomix

brainomix.com

Oxford spin-out building AI imaging biomarkers for stroke and lung disease, speeding emergency treatment decisions from CT and MRI scans.

Skin Analytics

skin-analytics.com

Dermatology AI holding a Class III autonomous decision mark. Has detected 20,000 cancers in the UK, and in 2026 launched a smartphone-only version.

Accurx

accurx.com

London communications platform used across the majority of NHS GP practices, now shipping ambient AI scribing.

Mind Foundry

mindfoundry.ai

Oxford-based AI company spun out of the University of Oxford, focused on defence and national security applications. ISO 27001 certified.

Skyral

skyral.com

British company combining digital-twin modelling with AI for defence, national security and infrastructure decision-making. Clients across NATO and the UK MoD.

Ripjar

ripjar.com

Cheltenham-founded, GCHQ-alumni-led. AI-driven open-source intelligence and financial crime screening for government and enterprise.

Advai

advai.co.uk

UK AI assurance specialists stress-testing model robustness and failure modes for government and defence.

Enzai

enz.ai

Belfast-based enterprise AI governance platform covering the EU AI Act, ISO 42001 and NIST AI RMF. ISO 27001 certified since 2023.

Vaire Computing

vaire.co

UK startup developing reversible-computing chips aimed at near-zero energy consumption.

Redcentric

redcentricplc.com

UK managed services provider with an assured sovereign cloud offering for regulated and public sector workloads.

Stonesthro

stonesthro.co.uk

UK-sovereign AI-ready microedge cloud with 15,800+ distributed sites across the UK Critical National Infrastructure estate. GPU-as-a-service, IaaS/PaaS, Kubernetes. Partnered with Cornerstone and Zadara. NVIDIA GPU-optimised platforms.

Pulsant

pulsant.com

UK sovereign AI-ready data centres. Infrastructure platform is fully UK-owned and built on UK data centres, serving regulated and public sector workloads.

Lumai

lumai.ai

Oxford spin-out building 3D free-space optical compute. Iris Nova server runs billion-parameter LLMs in real time at up to 90% lower energy.

Oriole Networks

oriolenetworks.com

UCL spin-out developing photonic networking technology for AI/ML and HPC workloads.

Optalysys

optalysys.com

Yorkshire-based optical computing company accelerating fully homomorphic encryption, enabling computation on data that is never decrypted.

Ark Data Centres

ark-d-c.com

UK-owned and operated data-centre group with a strong government and defence customer base, now building AI-capable capacity. Trusted strategic partner since 2010.

DataVita

datavita.co.uk

Scotland's largest independent data-centre and cloud operator, offering UK-sovereign hosting for regulated workloads.

Aveni

aveni.ai

Edinburgh firm building financial-services LLMs and compliance automation.

CuspAI

cusp.ai

Cambridge-based company using AI and foundation models for materials discovery. A genuine example of UK frontier scientific AI.

Tractable

tractable.ai

UK company founded in 2014, building computer-vision AI for vehicle and property visual assessment.

Secondmind

secondmind.ai

Cambridge company building engineering AI that helps engineers reach reliable answers with far fewer physical tests and simulations. Automotive-focused.

Omnea

omnea.co

London AI-first procurement and spend-control platform, named top UK startup in the 2026 Startups 100 Index.

Healx

healx.io

Cambridge-headquartered and UK-incorporated AI-native drug discovery company focused on rare diseases.

Congenica

congenica.com

Cambridge genomic analysis platform using AI to interpret whole-genome sequencing data, built out of the 100,000 Genomes Project.

Basecamp Research

basecamp-research.com

London company building biodiversity-derived foundation models for protein and enzyme design.

Hadean

hadean.com

London distributed computing and simulation platform, selling into UK and US defence for synthetic environments and mission rehearsal.

Naimuri

naimuri.com

Manchester-based data engineering and AI company working across UK national security and law enforcement.

Mindgard

mindgard.ai

Lancaster University spinout doing automated red-teaming and security testing of AI systems.

Conjecture

conjecture.dev

London-based UK company focused on controllable and safe advanced AI, building cognitive-emulation architectures for alignment.

Trilateral Research

trilateralresearch.com

AI governance, AI literacy training and responsible AI services. Tools listed in the CDEI AI Assurance Portfolio and the OECD Catalogue of Trustworthy AI Tools.

Holistic AI

holisticai.com

London AI governance and audit platform, an early mover in algorithmic auditing and shadow-AI discovery.

Vigil AI

vigil.ai

UK company building AI classification tools for child sexual abuse material, used by law enforcement.

Platform DC

platformdc.io

Modular AI data centres for generative, agentic and physical AI. Solves scalability and efficiency challenges of delivering AI infrastructure. High-performance, sustainable, deployable anywhere. Warrington, UK.

Literal Labs

literal-labs.ai

Newcastle company using Tsetlin machines instead of neural networks. Logic-based AI for edge devices — no GPU, explainable by design.

Genie AI

genieai.co

London legal AI platform built on an open library of legal documents, aimed at SMEs and in-house teams.

Upp.ai

upp.ai

UK platform using real-time demand data to build and optimise paid media campaigns for retailers.

Add Velocity

addvelocity.co.uk

London-based AI training and implementation consultancy for regulated buy-side investment firms. Workshops and multi-week implementation programmes covering strategy, tooling and governance. Companies House 16071088.

Answertree

answertree.com

Sheffield-based developer of HyperChannel OS, an AI-native operating system for the technology channel. CPQ, quote-and-PO automation, RFP automation and partner workspace share one agentic data flow. Companies House 14567441.

nolabs

nolabs.ai

UK-incorporated (NOLABS AI LTD) builder of open-source trust infrastructure for AI agents — guardrails and tooling that make AI agents safe to deploy, audit and trust in production.

Whitespace

white.space

Sovereign AI operating system for defence and national security. ISO 27001 certified with zero non-conformities. Collective platform deploys across cloud, on-premise, edge, and air-gapped systems. Full auditability, policy-driven governance, no external data sharing. 65+ staff, Belfast HQ. Series A backed.

ArgyllCloud

argylldata.ai

Agentic workflow inference on UK-sovereign RDU hardware. OpenAI-compatible API. Up to 10× faster and 90% lower cost than GPU alternatives.

Civo Sovereign AI

civo.com/uk-sovereign-cloud

UK-sovereign cloud with 100% UK-based infrastructure. Data stays under UK law. NVIDIA B200 GPUs, open standards, no lock-in.

S-AI

s-ai.com

Purpose-built for government, defence, and national security. First-class AI capabilities delivered from sovereign infrastructure. GDPR & UK GDPR compliant.