Blockchain Infrastructure Companies in the UK: 89 Active Firms (2026)
Blockchain infrastructure companies in the UK build distributed-ledger networks, node services and transaction tooling for enterprise users.
Buying centres tend to sit with chief technology officers, platform engineering teams, digital-asset operations, treasury functions and risk teams rather than general IT procurement. Buyers are usually enterprise finance groups, technology platforms and digital-asset operators that need controlled transaction workflows, key-management processes, monitoring and audit evidence. Engagements are typically technical and proof-led: paid pilots, API integration, security review and ongoing operational support matter more than seat-based software purchasing. The more credible suppliers look like specialist engineering businesses, with cryptography, distributed systems and compliance-aware operations sitting close together.
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Across the UK, 89 blockchain infrastructure companies are actively trading, making this a compact cohort rather than a broad software category. They report a combined headcount of 1,092 employees, so the employment footprint sits mainly in specialist engineering, security operations, client integration and compliance-facing technical roles. The market shape fits a category where procurement is concentrated among enterprise finance, technology platforms and digital-asset operators, and where trust-building, audit evidence and operational continuity tend to matter before implementation work starts.
Operating constraints depend less on the infrastructure label than on what the tooling enables. Where providers remain purely technical, they behave like enterprise-software suppliers, with contractual controls around uptime, audit trails, incident response and data handling. The perimeter changes when systems touch custody, payments, token issuance, trading venues or financial promotions; clients then usually require evidence of governance, segregation of duties, monitoring and anti-money-laundering controls. Market structure is also shaped by conservative procurement, as banks and enterprise technology buyers tend to prefer vendors that can document resilience, change control and key-management procedures.
Demand appears to be shifting from experimental ledger projects towards operational plumbing that regulated buyers can run, monitor and audit. That favours providers with narrow infrastructure depth rather than broad platform claims. Many firms still look specialist and early-commercial, so the path to scale tends to run through enterprise validation, channel partnerships or embedding inside larger financial and technology workflows. Consolidation also looks plausible where adjacent capabilities overlap, particularly around custody support, transaction monitoring and developer operations. The constraint is not only buyer interest; it is the burden of proving reliability, governance and continuity before procurement teams will depend on the infrastructure.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
Active director count is the full Companies House board, so it can be higher than the number of names listed — we leave out nominee and formation-agent directors, who aren’t worth contacting. It’s blank for the small number of companies whose officers we haven’t fetched yet.
You’re charged per business, not per row. Where a business trades through several registered companies you get every one, and the Group Primary column marks one row per business — filter to those and the count matches your invoice. Rows sharing a website are not automatically one business: franchises and multi-site operators each count separately, and where names don’t prove a relationship we count them apart rather than guess.
89
Active firms
2026
11
Above £5M
Reported revenue threshold
17
Recent incorporations
Incorporated since 2022
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Key facts
About 12% of the trading cohort reports turnover above £5M (11 of 89 firms) — the rest sits below that revenue band.
19% of the cohort was incorporated since 2022 (17 firms), so a sizeable share is in its first few filing cycles.
Infrastructure suppliers sit beneath customer-facing blockchain applications, including payments, asset workflows and internal transaction systems.
Sales activity tends to centre on enterprise technology, finance and operations buyers rather than consumer speculation.
Procurement often tests operational resilience, network governance and integration work before production use.
The segment spans network operation, node services and transaction tooling, so buyer requirements vary by workload rather than by a single software category.
Top UK Blockchain Infrastructure companies
Financial sub-scores
Computed from 3 filingsProvides enterprise blockchain infrastructure and software tools for building and operating distributed ledger networks. Offers platforms for tokenization, digital asset lifecycle management,…
Serves financial institutions, central banks, capital markets firms, asset managers, financial market infrastructures, insurers, public sector bodies and enterprise network operators adopting…
Financial Health
StrongStrong · Hiring · 20% CAGR over 2y
Location
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- Digital Asset05984983
Financial sub-scores
Computed from 3 filingsDevelops blockchain infrastructure and software for financial institutions, including the Canton Network. Provides tools to tokenize assets, issue digital securities, and support clearing,…
Serves regulated financial institutions and capital markets participants, including banks, custodians, market infrastructure providers, asset managers and crypto finance firms seeking institutional…
Financial Health
StrongStrong · Growing, Hiring · 18% CAGR over 2y
Location
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Financial sub-scores
Computed from 4 filingsProvides Web3 development infrastructure for decentralised applications. Offers node RPC services, virtual testnets, transaction simulation, smart contract debugging tools, and monitoring systems,…
Sells to B2B Web3 teams building dapps and smart contracts, including blockchain developers, engineering teams, and chain operations teams needing development, testing, node infrastructure, and…
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
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Financial sub-scores
Computed from 4 filingsProvides blockchain development platform offering APIs, RPC node access, SDKs and orchestration tools for building Web3 applications. Enables developers to interact with over 100 blockchain networks,…
Serves developers and product teams at businesses building Web3 applications, including financial services, crypto wallets, gaming, compliance, NFT and digital asset platforms.
Financial Health
DistressedDistressed · -13% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsDevelops and maintains a Layer 1 blockchain platform that enables developers and enterprises to build and deploy decentralised applications and custom blockchains, offering EVM compatibility,…
Serves developers, enterprises and institutions building Web3 applications, custom public or private blockchains, tokenisation, supply chain and private finance solutions, plus ZIL holders and…
Financial Health
StrongStrong · Growing, Hiring · 98% CAGR over 4y
Location
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Computed from 5 filingsDevelops and maintains an open-source blockchain network that supports cross-border payments, asset tokenization, and decentralized finance applications. Provides infrastructure, smart contract…
Serves blockchain developers, financial institutions, fintechs and wallet providers building global payments, asset tokenization and DeFi products, including enterprises and innovators needing…
Financial Health
StrongStrong · 2% CAGR over 2y
Location
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Financial sub-scores
Computed from 2 filingsDevelops financial market infrastructure for digital assets, offering tokenisation registry, digital clearing, payment, and settlement systems. Platform connects trading venues and participants to…
Serves B2B institutional participants in digital asset markets, including traditional finance firms, digital asset institutions, trading venues, liquidity providers and post-trade service providers…
Financial Health
WeakWeak · Hiring · 324% CAGR over 1y
Location
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Computed from 3 filingsProvides digital asset infrastructure software for financial institutions and fintech companies, including custody and wallet technology, treasury management, payment and settlement tools,…
Serves B2B customers in digital assets, including fintechs, crypto exchanges, trading firms, payments companies, banks, Web3 businesses and startups, from high-volume retail platforms to…
Financial Health
StrongStrong · Hiring · 19% CAGR over 2y
Location
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Computed from 5 filingsDevelops blockchain-based software for financial institutions, including systems for liquidity management, interbank and cross‑border payments, digital cash and deposit tokens, and platforms…
Serves financial institutions, including banks, central banks and treasury/transaction services teams, plus market participants involved in interbank payments, FX settlement, digital cash, collateral…
Financial Health
WeakWeak · Hiring · 5% CAGR over 4y
Location
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- Zumo09897919
Financial sub-scores
Computed from 4 filingsProvides API-based infrastructure for businesses to launch and operate cryptocurrency services, including digital asset custody, trading, fiat on/off ramps, identity verification (KYC/KYB), AML…
Serves B2B financial services and crypto firms, including investment and trading platforms, neobanks, retail banks, fintech apps, exchanges and VASPs seeking access to UK crypto customers.
Financial Health
StableStable · Hiring · 6% CAGR over 3y
Location
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Financial sub-scores
Computed from 3 filingsProvides enterprise technology services focused on Web3 and cloud infrastructure, including blockchain node deployment, staking and validator operations, managed cloud services, data pipelines, and…
Serves B2B enterprise customers, financial institutions, Web3 networks, crypto organisations, and digital-asset teams needing cloud, staking, infrastructure, data and AI support.
Financial Health
StableStable · 0% CAGR over 2y
Location
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- Copper11148681
Financial sub-scores
Computed from 5 filingsProvides digital asset custody and trading infrastructure for institutional investors. Uses multi‑party computation technology to secure crypto wallets, manage segregated vaults, and enable…
Serves institutional clients in digital assets, including financial institutions, crypto funds, token issuers and trading firms needing custody and trading infrastructure for cryptocurrencies and…
Financial Health
HealthyHealthy · 0% CAGR over 5y
Location
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Computed from 5 filingsProvides non-custodial Ethereum staking services, operating validator infrastructure that allows clients to stake ether while retaining control of their assets. Also offers staking infrastructure and…
Serves institutional holders of ether, plus crypto custodians and exchanges seeking Ethereum staking capabilities for their own customers.
Financial Health
StrongStrong · Growing, Hiring · 31% CAGR over 4y
Location
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Computed from 5 filingsDevelops a lightweight layer‑1 blockchain platform designed to run full nodes on edge and IoT devices. Provides protocols and tools for building decentralized applications, generating tokens, and…
Serves blockchain developers, DePIN and IoT infrastructure teams, and enterprises building edge-device networks for AI, smart cities, autonomous systems, real-world assets and gaming.
Financial Health
StrongStrong · Hiring · 16% CAGR over 4y
Location
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Computed from 5 filingsDevelops blockchain infrastructure and digital asset services for financial institutions, including stablecoin issuance, tokenised assets backed by fiat or gold, crypto brokerage, custody, trading,…
Sells to enterprises in financial services and payments, including global institutions building blockchain, stablecoin, crypto brokerage, custody, trading, wallet, and payout products. Also serves…
Financial Health
StableStable · -64% CAGR over 4y
Location
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Computed from 3 filingsDevelops blockchain oracle infrastructure that connects smart contracts with external data, APIs, and payment systems. Provides data feeds, cross‑chain interoperability, automation, and verification…
Serves financial institutions, capital markets infrastructure providers, banks, asset managers, blockchain ecosystems, DeFi protocols, exchanges, stablecoin and tokenized-asset issuers, and…
Financial Health
WeakWeak · Hiring · 8% CAGR over 2y
Location
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Computed from 3 filingsProvides digital asset custody and infrastructure services for institutional investors, including secure storage of cryptoassets, staking, and connectivity to trading, borrowing and lending partners,…
Serves institutional investors, asset managers and financial institutions seeking regulated access to digital asset markets, including trading, lending, borrowing and staking workflows.
Financial Health
HealthyHealthy · Hiring · 26% CAGR over 2y
Location
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Computed from 3 filingsProvides blockchain‑as‑a‑service software and infrastructure for enterprises, enabling development and deployment of blockchain applications for supply chain tracking, digital assets, tokenisation,…
Serves enterprise businesses in supply chain and logistics, consumer brands, and loyalty and rewards, targeting teams seeking blockchain-based digital asset and tokenisation initiatives.
Financial Health
DistressedDistressed · -44% CAGR over 2y
Location
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Computed from 4 filingsDevelops infrastructure software for financial institutions to manage digital asset and blockchain operations. Provides an orchestration platform and API that integrates traditional finance systems…
Serves regulated financial institutions and traditional finance businesses seeking to add digital asset, crypto, and blockchain-based financial activity to their operations.
Financial Health
StableStable · -21% CAGR over 3y
Location
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Computed from 2 filingsDevelops blockchain infrastructure and software for Web3 networks. Contributes core engineering to the Polkadot blockchain and builds developer tools, smart contract technologies, and related systems…
Serves enterprises exploring long-term Web3 adoption, startups and developer teams building blockchain-based applications, and business development teams seeking real-world Polkadot use cases.
Financial Health
WeakWeak · Hiring · 350% CAGR over 1y
Location
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Computed from 3 filingsProvides digital asset custody and wallet infrastructure for stablecoins and blockchain payments. Offers APIs and tools for creating and managing wallets, integrating blockchain transactions, and…
Serves B2B web3 startups and enterprises building stablecoin and payments products, targeting product, security, finance/operations and engineering teams.
Financial Health
StableStable · Hiring · 59% CAGR over 2y
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Computed from 4 filingsDevelops technology platforms and infrastructure for financial and capital markets, including multi‑asset exchange and trading systems, post‑trade processing, and blockchain-based solutions for…
Serves financial and capital market institutions, exchanges, post-trade providers, digital asset platforms, carbon market registries and participants across traditional, digital and hybrid asset…
Financial Health
DistressedDistressed · -7% CAGR over 3y
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Develops blockchain-based software platforms for financial institutions, including the Corda distributed ledger. Enables tokenization of real‑world assets, digital asset issuance, and interoperable…
Serves banks, exchanges, market infrastructure providers and other regulated financial-market institutions, with engagement across central banks and regulators involved in digital-asset, tokenization…
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Develops software and infrastructure for the Rootstock blockchain ecosystem, a Bitcoin sidechain enabling smart contracts and decentralised finance. Provides developer tools, protocols and token…
Serves blockchain developers, DeFi projects and institutions participating in the Bitcoin and Rootstock ecosystem, especially teams creating decentralized financial apps and services.
Financial Health
N/AN/A
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Computed from 2 filingsOperates a regulated digital asset exchange and financial market infrastructure providing issuance, listing, trading, settlement and custody of digital securities and tokenised assets. Also offers…
Serves institutional capital market participants, including issuers, traders, broker-dealers, banks, corporations and investors seeking access to digital securities and digital asset market…
Financial Health
StrongStrong · Hiring · 17% CAGR over 1y
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Computed from 5 filingsDevelops open-source infrastructure for passwordless authentication and private key management for Web3 applications. Provides SDKs and services that split and manage cryptographic keys across…
Targets developers and product teams at Web3 applications and crypto wallet providers, plus ecosystem partners integrating wallet onboarding for consumer crypto users.
Financial Health
DistressedDistressed
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- ClearpoolNI611510
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Computed from 5 filingsDevelops and operates a digital asset trading platform designed as a tokenised multilateral trading facility (MTF). Supports trading of security tokens, cryptoassets and derivatives such as futures…
Serves institutional financial services firms, exchange members and professional cryptoasset market participants engaging in regulated tokenised derivatives, security tokens and digital asset markets.
Financial Health
StrongStrong · Hiring · 7% CAGR over 4y
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Computed from 2 filingsDevelops trading and blockchain infrastructure for financial platforms, including high‑performance matching engines, liquidation frameworks and parallelised settlement systems. Also builds custom…
Serves B2B clients building digital-asset trading platforms, including crypto exchanges, DeFi/DEX projects, fintechs and financial institutions needing trading and blockchain infrastructure expertise.
Financial Health
WeakWeak · 0% CAGR over 1y
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- The Blockhouse Technology06946177
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Computed from 3 filingsDevelops blockchain-based security software and infrastructure for managing digital assets and transactions. Provides cloud wallets, custody services, confidential computing, key management, and…
Serves businesses and organisations handling critical transactions, sensitive information and digital assets, particularly teams with security, regulatory compliance, blockchain, confidential…
Financial Health
StrongStrong · Hiring · 27% CAGR over 2y
Location
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Computed from 4 filingsDevelops software for financial institutions that automates post‑trade processes, including trade lifecycle management, collateral management and repurchase agreement workflows. Uses smart contracts…
Sells to B2B financial institutions in capital markets, including firms managing post-trade operations, collateral, settlement and repo workflows. Targets teams handling trade lifecycle, custodians,…
Financial Health
StableStable · Hiring · 88% CAGR over 3y
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Computed from 2 filingsDevelops software infrastructure for blockchain applications, providing zero‑knowledge-based tools for verifying on-chain data, proving computation correctness, and improving blockchain scalability…
Serves blockchain networks, Web3 protocols and developers building decentralized applications that need verifiable on-chain data, compute and scaling support.
Financial Health
StrongStrong · Growing · 0% CAGR over 1y
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Computed from 3 filingsProvides data infrastructure and analytics for proof‑of‑stake blockchain networks, offering APIs and tools that track validator and node operator performance, rewards, and metadata, and a network…
Serves Web3 infrastructure teams, staking pools, node operators, developers and applications working with proof-of-stake networks such as Ethereum, Solana, Avalanche, Cosmos and Polygon.
Financial Health
StrongStrong · Growing, Hiring · 87% CAGR over 2y
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Develops cryptographic software infrastructure that converts data from websites, emails and blockchains into verifiable proofs using zero‑knowledge techniques, enabling developers to integrate…
Sells to Web3 developers, blockchain startups, and enterprises building privacy-preserving applications, including businesses needing user data verification, identity, finance, compliance, loyalty,…
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N/AN/A
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Computed from 5 filingsDevelops cryptographic infrastructure for blockchain applications using fully homomorphic encryption (FHE), enabling confidential smart contracts and private computation for decentralized finance,…
Targets Web3 developers, DeFi protocols, blockchain infrastructure teams, and institutions building or adopting confidential on-chain applications, including private lending, shielded stablecoins,…
Financial Health
HealthyHealthy · Hiring · 34% CAGR over 4y
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Computed from 3 filingsDevelops computing hardware and software that accelerate fully homomorphic encryption using silicon photonics. Provides products such as the LightLocker Node for confidential blockchain…
Serves B2B blockchain and Web3 organisations, including teams building private smart contracts, confidential DeFi, tokenised real-world asset platforms and secure applications requiring scalable…
Financial Health
StrongStrong · Hiring · 63% CAGR over 2y
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Computed from 4 filingsDevelops open‑source cryptography software and protocols using fully homomorphic encryption (FHE) to enable confidential smart contracts on blockchain networks. Provides developer tools,…
Serves blockchain developers, Web3 startups and enterprises building on L1/L2 networks, especially teams in DeFi, payments, banking, tokenization, governance and digital assets.
Financial Health
StableStable · Hiring · 8% CAGR over 3y
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- Trilitech14114174
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Computed from 3 filingsDevelops and supports software and applications for the Tezos blockchain, including work on the core protocol. Provides technical support, partnerships, and incubation to help developers, startups,…
Serves blockchain developers, entrepreneurs, startups, artists and corporate partners building applications or partnerships within the Tezos ecosystem.
Financial Health
HealthyHealthy · Hiring · 92% CAGR over 2y
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Computed from 5 filingsDevelops blockchain-based infrastructure and tools for online games, including the World Engine sharded rollup SDK for building scalable on‑chain multiplayer games. Also develops and publishes games…
Serves game developers and studios in crypto/onchain gaming, especially teams building massively multiplayer online games, alongside players of its own blockchain games.
Financial Health
WeakWeak
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Computed from 4 filingsDevelops cryptocurrency payment gateway software that enables businesses to accept, convert, store and pay out digital assets. Provides APIs, plugins and wallets‑as‑a‑service supporting Bitcoin,…
Serves businesses of all sizes worldwide in gaming, online casinos and gambling, Web3, forex brokerage, asset management, prop trading, ecommerce, escrow, real estate and luxury brands.
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HealthyHealthy · Growing · 0% CAGR over 3y
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Computed from 5 filingsProvides infrastructure and brokerage services for digital asset markets. Offers algorithmic trading, liquidity access, lending, settlement and custody connectivity through a unified platform…
Serves institutional digital asset firms, including funds, brokers, trading firms and market professionals operating across fiat and crypto markets.
Financial Health
DistressedDistressed · -10% CAGR over 4y
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Computed from 3 filingsProvides a payment infrastructure platform enabling businesses to send and collect cross-border payments via an API. Supports local bank transfers, mobile money networks, foreign exchange, and…
Serves businesses and organisations with cross-border payment operations across the US, UK, Europe, Asia and Africa, particularly those active in emerging markets.
Financial Health
StrongStrong · Growing · 3% CAGR over 2y
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Computed from 4 filingsDevelops blockchain analytics software and data services used to trace cryptocurrency transactions, assess wallet and exchange risk, monitor transactions for compliance, and support investigations by…
Serves government agencies, law enforcement, regulators, tax authorities, crypto exchanges, financial institutions, insurance firms, cybersecurity companies and web3 businesses operating in digital…
Financial Health
WeakWeak · -5% CAGR over 3y
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Computed from 5 filingsProvides payment infrastructure and accounts for financial institutions operating in fiat and cryptocurrency markets. Offers multi‑currency payment accounts, instant settlement via its BLINC network,…
Serves B2B financial institutions and digital asset firms, including crypto exchanges, liquidity providers, market makers, investment and hedge funds, custodians, payment processors and wallet…
Financial Health
StableStable · -79% CAGR over 4y
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Computed from 5 filingsProvides decentralized cloud computing infrastructure and a peer‑to‑peer compute network for deploying and scaling applications. Offers private AI automation tools, GPU compute marketplace services,…
Serves businesses and developer teams running Web3, AI or application workloads, including blockchain protocols, web platforms, design studios and healthcare operators.
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StrongStrong
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- Calimero14219383
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Computed from 3 filingsDevelops a software framework and network for building and running peer‑to‑peer self‑sovereign applications. Provides tools for developers to create privacy‑focused apps with local data storage,…
Targets developers and Web3 teams building privacy-preserving, peer-to-peer applications, including dApp creators, blockchain projects and organisations handling user-controlled data.
Financial Health
DistressedDistressed
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- IOV4213181275
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Computed from 5 filingsDevelops distributed ledger and digital identity technology for secure data sharing and trusted digital transactions. Provides supply chain traceability software, Interu, enabling organisations to…
Serves businesses, governments and partners in complex, regulated industries, especially companies managing global supply chains that need EUDR compliance, due diligence data sharing and material…
Financial Health
StrongStrong · Hiring · 78% CAGR over 4y
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Computed from 2 filingsDevelops a fiat‑backed stablecoin protocol issuing paraUSD, a USD‑pegged digital token backed by U.S. Treasury bills and repo reserves. Provides APIs and SDKs for businesses and developers to…
Serves B2B customers including developers, fintech platforms, businesses and corporate treasury teams seeking USD-backed stablecoin yield capabilities for their users or internal treasury management.
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DistressedDistressed · 0% CAGR over 1y
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Computed from 2 filingsDevelops enterprise blockchain software and platforms for businesses. Provides applications for supply‑chain traceability, customer engagement, digital asset management, and financial networks,…
Sells to B2B enterprise customers in traditional industries, especially automotive manufacturers and supply-chain operators, as well as businesses developing customer engagement and digital financial…
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StableStable · 0% CAGR over 1y
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Computed from 3 filingsDevelops web and mobile trading platform technology for financial brokers and trading firms. Provides MT4/MT5 bridging, price aggregation, smart order routing and matching, on‑chain settlement tools,…
Serves B2B financial trading firms, including brokerages, proprietary trading platforms and exchanges using MT4/MT5 or FIX-based infrastructure.
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HealthyHealthy · Hiring · 14% CAGR over 2y
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- OSL Global09727349
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Computed from 3 filingsOperates a digital asset trading platform offering spot trading of cryptocurrencies such as Bitcoin, Ethereum and stablecoins. Provides custody services, OTC trading, trading APIs, tokenisation…
Serves individual crypto traders, institutional investors, and global businesses needing regulated digital asset infrastructure, including OTC clients, platforms integrating trading/custody,…
Financial Health
StrongStrong · Hiring · 409% CAGR over 2y
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How UK Blockchain Infrastructure companies work and how to sell to them
What they do
Blockchain infrastructure firms usually earn through recurring platform access, managed node operations, API consumption, transaction-processing charges, enterprise licences and paid integration work. The commercial model often blends a fixed platform fee with usage-based pricing, security review, implementation and support retainers, because customers need operational continuity rather than a simple software login. Some suppliers sell developer tooling; others run custody-adjacent, monitoring or settlement infrastructure. Services revenue remains common, particularly where client systems need bespoke integration, governance workflows or production runbooks before the infrastructure is trusted in live operations.
Who they sell to
Most sell to enterprise finance teams, digital-asset operators, trading and settlement functions, technology platforms and infrastructure teams inside larger corporates. Decision-makers are typically chief technology officers, heads of platform engineering, digital-asset operations leads, risk officers, treasury teams and information-security reviewers, with procurement joining once technical fit is credible. Sales cycles tend to be proof-led and measured in months: sandbox testing, API review, security assessment, legal terms and operational-risk sign-off usually precede wider deployment. Direct technical sales is common, while partner-led routes matter where the infrastructure is embedded into financial, custody or developer workflows.
What they buy
Blockchain infrastructure companies tend to spend on cloud hosting, managed compute, networking, storage, database operations, observability, incident management and security testing. Key-management controls, secrets management, identity tooling, API gateways, developer documentation, billing operations and customer-support systems are also relevant, particularly once usage-based revenue appears. Around the commercial edge, many buy specialist legal advice, audit preparation, accounting, tax support, technical recruitment and content-led demand generation. Sellers should expect technical evaluation from engineers and risk reviewers, not just budget approval from a commercial owner.
Why and how to sell to them
Buying intent often appears when a firm moves from pilot activity into production workloads, wins a regulated customer, adds treasury or risk leadership, expands engineering capacity, or has to document controls for a client review. Common pains are integration effort, uptime evidence, incident response, wallet and key-control governance, audit trails and the cost of scarce distributed-systems talent. Outbound messages tend to land better when they connect to those pressures: fewer manual operational checks, clearer evidence for risk teams, shorter integration queues, or lower exposure to outages and client due-diligence friction.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
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