Blockchain And Crypto Companies in London: 164 Active Firms (2026)
Blockchain and crypto companies in London build distributed-ledger infrastructure, custody, trading, payments and compliance services for UK and global markets.
Buying centres cluster around institutional finance, digital-asset operations and regulated fintech infrastructure: treasury and payments teams, trading desks, compliance functions, and software engineering groups all appear in the buyer base. Engagements tend to be business-to-business or institutional, with procurement shaped by custody risk, transaction monitoring, wallet governance, market access and integration work rather than simple seat-based software buying. The better-fit suppliers usually carry specialist technical and compliance teams, sell into financial services or enterprise software accounts, and support higher-value contracts where assurance, availability and change control matter as much as product scope.
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London has 164 actively trading blockchain and crypto companies in this list, a small enough cohort for firm-level review but large enough to include infrastructure, custody, trading, payments, analytics and compliance models. Reported employment totals 951 people, which points to a specialist workforce rather than a broad labour-market footprint. Commercial maturity is uneven: 16 firms report turnover above £5M, while 36 were incorporated since 2022. That mix gives researchers a split view of the capital’s market, with a limited revenue-scaled tier sitting alongside newer regulation-adjacent entrants still proving demand.
The perimeter remains activity-led. Firms that provide in-scope crypto services must register with the FCA under the Money Laundering Regulations, with supervision focused on anti-money laundering and counter-terrorist financing controls. Separate obligations touch cryptoasset financial promotions and the Travel Rule, while planned rules are expected to bring more trading platform, custody, dealing, arranging, staking and qualifying stablecoin activity into an authorisation regime. For London suppliers selling to institutional customers, the practical effect is a diligence burden: governance, safeguarding, transaction screening and customer disclosures tend to sit close to product design, not just legal review.
Further maturation appears more likely to come through compliance depth and institutional distribution than through a broad consumer land-grab. The cohort tends to favour compact teams with specialist engineering, operations and risk skills, which may make hiring and authorisation capacity more important constraints than raw company formation. Scale-up scarcity also suggests a market where partnership, acquisition and white-label supply can matter, especially for custody, monitoring and market-access functions. As FCA rules develop, firms already used to regulated buyers may find the adjustment easier than consumer-facing entrants built around lighter onboarding and faster product iteration.
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
164
Active firms
2026
16
Above £5M turnover
London firms
36
Incorporated since 2022
newer London entrants
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Key facts
About 9% of the trading cohort reports turnover above £5M (16 of 164 firms) — the rest sits below that revenue band.
21% of the cohort was incorporated since 2022 (36 firms), so a sizeable share is in its first few filing cycles.
Firms providing in-scope crypto services must register with the FCA under the Money Laundering Regulations for anti-money laundering and counter-terrorist financing supervision.
The future UK crypto regime is expected to come into force on 25 October 2027, covering qualifying trading platforms, custody, dealing, arranging, staking and stablecoin issuance.
FCA-commissioned research published in 2024 found that 93% of UK adults had heard of cryptoassets and 12% owned them, equivalent to around 7 million adults.
The FCA continues to describe crypto investing as unregulated and high-risk, even as ownership is described more often as part of a wider investment portfolio.
A 2024 crypto adoption index ranked the United Kingdom 12th overall out of 151 countries; the United States ranked 4th.
Top London Blockchain And Crypto companies
Financial sub-scores
Computed from 4 filingsProvides digital asset infrastructure for banks, fintechs and trading platforms. Offers APIs and modules for cryptocurrency custody, trading, fiat on/off‑ramps, customer onboarding (KYC/KYB), AML…
Serves B2B financial services and crypto firms, including investment platforms, neobanks, retail banks, consumer finance apps, exchanges and VASPs seeking UK crypto market access.
Financial Health
StrongStrong
Location
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Financial sub-scores
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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Provides an API-based platform that enables banks, fintechs and trading platforms to launch and operate cryptocurrency services. Offers modules for digital asset custody, trading, fiat on/off ramps,…
Serves B2B financial services organisations—banks, neobanks, investment and trading platforms, consumer finance apps, fintechs, crypto exchanges and VASPs—seeking UK crypto market entry or continued…
Location
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Financial sub-scores
Computed from 3 filingsOperates a regulated exchange for institutional trading of cryptocurrency derivatives. Provides digital asset derivative products, market indices, and trading infrastructure, with centrally cleared…
Serves professional and institutional market participants, not retail investors. Targets firms seeking compliant access to digital asset derivatives trading, including institutions allocating to…
Financial Health
StrongStrong · 60% CAGR over 1y
Location
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Financial sub-scores
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
Location
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Financial sub-scores
Computed from 4 filingsOperates an online platform for buying, selling and trading cryptocurrencies and other digital assets. Provides crypto custody, staking and payment services, and enables clients to deposit and…
Serves retail crypto investors and active traders, plus institutional clients such as asset managers, corporations, ETP issuers, governments, hedge funds, market makers, protocols, VC firms and…
Financial Health
WeakWeak · 0% CAGR over 3y
Location
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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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Financial sub-scores
Computed from 4 filingsOperates a regulated multilateral trading facility for cryptocurrency derivatives, enabling institutional users to trade futures contracts on assets such as Bitcoin and Ethereum. Provides trading…
Serves institutional traders, financial firms and crypto market participants that qualify as MTF members and trade cryptocurrency derivatives via API or member portal.
Financial Health
StrongStrong · -86% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides over-the-counter liquidity and trading services for digital asset markets, including derivatives and spot crypto. Offers market making, OTC trading, stablecoin swaps, and liquidity solutions…
Serves institutional digital-asset market participants globally, including asset managers, funds, banks, brokers, exchanges, fintechs, crypto projects and digital asset treasuries; does not serve…
Financial Health
StableStable · Hiring · 7% CAGR over 4y
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Provides blockchain analytics and cryptocurrency compliance software for financial institutions, exchanges, and regulators, including wallet and transaction screening, AML monitoring, risk scoring,…
Serves crypto-facing businesses and public-sector bodies, including financial institutions, centralized exchanges, network operators, token and stablecoin issuers, DeFi protocols, law enforcement…
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Financial sub-scores
Computed from 3 filingsDevelops blockchain intelligence software used by financial institutions, crypto businesses and law enforcement to monitor cryptocurrency transactions, screen wallets, detect fraud and sanctions…
Serves government agencies, law enforcement, national security teams, regulators, tax authorities, financial institutions, fintechs and crypto businesses involved with digital assets.
Financial Health
StrongStrong
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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Financial sub-scores
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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Operates a regulated marketplace for issuing, trading and lending alternative and digital assets. Provides services for issuers and investment managers including fund structuring, tokenised…
Serves institutional investors, investment managers and securities issuers seeking regulated market access to alternative assets, digital assets and tokenised securities in institutional capital…
Financial Health
N/AN/A
Location
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Financial sub-scores
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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Financial sub-scores
Computed from 3 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 · -10% CAGR over 2y
Location
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Operates a cryptocurrency exchange and digital asset platform enabling users to buy, sell and trade cryptocurrencies, access derivatives such as perpetual contracts, stake assets, store funds in a…
Serves retail crypto investors and active traders in Europe, plus small and large institutions whose business requires cryptocurrency trading, staking, custody, and on-chain asset access.
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Provides institutional cryptocurrency trading and liquidity services, including OTC trading, market making, stablecoin swaps, and liquidity provision for banks, brokers, asset managers, exchanges,…
Serves institutional digital asset market participants globally, including asset managers, funds, banks, brokers, exchanges, digital asset treasuries, fintechs and crypto projects; does not serve…
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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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Financial sub-scores
Computed from 5 filingsProvides payment services through the Orbital platform, including pay-ins, payouts, virtual IBAN accounts, stablecoin wallets, and currency exchange. Serves businesses handling both traditional fiat…
Serves B2B and B2C companies needing fiat and digital-asset payment infrastructure, including eligible corporate clients outside the UK and high-net-worth companies for crypto-asset services.
Financial Health
StableStable · -49% CAGR over 4y
Location
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Financial sub-scores
Computed from 2 filingsDevelops accounting and financial reporting software for digital asset activities. Platform reconciles on‑chain transactions with internal systems and supports tax reporting, internal controls, token…
Sells to enterprise finance teams and accounting firms handling digital assets, including banks, exchanges, brokers, treasury and payments companies, asset managers, stablecoin and token issuers,…
Financial Health
StableStable · Hiring · 58% CAGR over 1y
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Financial sub-scores
Computed from 2 filingsProvides institutional digital asset brokerage and trading services, including over‑the‑counter cryptocurrency execution and an exchange platform. Enables institutions and professional investors to…
Serves corporations, financial institutions and professional investors entering or active in digital asset markets, with an emphasis on institutional clients across global markets.
Financial Health
WeakWeak
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Financial sub-scores
Computed from 2 filingsOperates an algorithmic trading firm in digital asset markets, providing OTC trading, spot and derivatives execution, and liquidity provision for cryptocurrencies and tokens. Offers API access, DeFi…
Serves institutional digital asset traders and counterparties, token issuers and protocols, DeFi projects and DAOs, and early-stage DeFi founders seeking venture backing.
Financial Health
StableStable · 0% CAGR over 1y
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Financial sub-scores
Computed from 2 filingsDevelops algorithmic trading software for digital assets, providing best‑execution services that route and execute orders across crypto trading venues. Uses machine learning, quantitative models and…
Serves institutional digital asset market participants, including hedge funds, asset managers, quant funds, OTC desks, brokers, custodians, exchanges, prime brokers, ECNs, and OMS/EMS platforms.
Financial Health
WeakWeak · 0% CAGR over 1y
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Financial sub-scores
Computed from 3 filingsProvides software platform connecting to crypto exchanges and blockchains to manage digital asset portfolios, capture trades, aggregate data, and monitor risk and exposures with analytics and…
Serves institutional digital asset investment businesses, including hedge funds, multi-manager platforms, OTC trading desks, treasury teams and prime brokerages, targeting portfolio managers,…
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
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Financial sub-scores
Computed from 3 filingsOperates an online cryptocurrency exchange and financial platform enabling users to buy, sell, trade, and store digital assets. Provides spot trading, instant purchase, wallet services, and staking…
Sells to retail cryptocurrency users and active traders, plus business customers seeking crypto services and partnerships. Targets global users, with some products and offers tailored by country or…
Financial Health
StableStable · -34% CAGR over 2y
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Financial sub-scores
Computed from 5 filingsProvides digital asset investment products and services, including exchange-traded products offering cryptocurrency exposure and yield strategies. Conducts market research, advises on blockchain…
Serves institutional and professional investors, plus financial intermediaries, seeking regulated digital-asset exposure, crypto yield strategies, research and blockchain investment advisory through…
Financial Health
StableStable · Hiring · 18% CAGR over 4y
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Financial sub-scores
Computed from 2 filingsProvides a digital finance platform offering cryptocurrency wallets, exchange services, and payment cards. Enables users and businesses to buy, hold, transfer, and spend cryptocurrencies and fiat,…
Serves retail crypto users, high-net-worth individuals, businesses needing stablecoin banking and corporate cards, and developers building stablecoin payment/card products. Targets a mix of B2C, B2B…
Financial Health
StrongStrong · Hiring · 66% CAGR over 1y
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Financial sub-scores
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 2 filingsProvides a digital asset financial services platform offering cryptocurrency trading, brokerage, lending and collateralised loans, custody, and investment products such as staking, structured…
Serves retail crypto users, high-net-worth individuals, and institutional clients seeking digital asset trading, investment, lending, custody, and wealth services, including listed companies and…
Financial Health
WeakWeak · 0% CAGR over 1y
Location
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Financial sub-scores
Computed from 3 filingsProvides software for institutional trading of digital assets, offering tools for price discovery, order execution, portfolio construction, risk management, treasury and settlement, data integration,…
Sells B2B to institutional digital-asset market participants, including asset managers, ETF issuers, hedge and crypto funds, proprietary trading firms, banks, brokers, OTC desks, custodians, payment…
Financial Health
HealthyHealthy · Profitable
Location
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Provides business payment services including multi‑currency named accounts, global money transfers and foreign exchange through an online platform. Also offers cryptocurrency trading, payment…
Targets high-risk and digital-asset sectors globally, serving pioneering businesses, corporates, institutional clients and high-net-worth individuals underserved by traditional banks.
Financial Health
N/AN/A
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Financial sub-scores
Computed from 3 filingsDevelops and maintains an open‑source decentralised finance protocol enabling non‑custodial cryptocurrency liquidity markets. Users can supply digital assets to earn interest or borrow against…
Serves retail crypto users seeking stablecoin yield and borrowing, plus DeFi developers, wallets, exchanges and fintech institutions integrating liquidity into apps for their own users.
Financial Health
WeakWeak · -92% CAGR over 2y
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Provides institutional services for digital assets including OTC trading, token market making and liquidity provision, digital asset investment products, treasury and cross‑asset financing solutions,…
Serves institutional investors and financial institutions seeking exposure to digital assets, including clients active in crypto and traditional finance markets, plus early-stage digital asset…
Financial Health
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Financial sub-scores
Computed from 4 filingsProvides blockchain validator infrastructure and cryptocurrency staking services across multiple networks. Offers staking APIs, RPC nodes, Web3 load balancing, token faucets, and white‑label…
Serves individual crypto holders, institutional digital-asset teams, Web3 developers, dApp operators and blockchain protocols seeking staking, validator and node infrastructure across multiple…
Financial Health
StableStable · -36% CAGR over 2y
Location
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Financial sub-scores
Computed from 3 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
WeakWeak · -29% CAGR over 2y
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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
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Financial sub-scores
Computed from 5 filingsProvides fiat-to-cryptocurrency and cryptocurrency-to-fiat payment infrastructure for web3 applications. Offers APIs, SDKs, and widgets enabling apps, wallets, and exchanges to let users buy or sell…
Serves Web3 businesses, including crypto wallets, exchanges, DeFi platforms, gaming and NFT apps, plus individual crypto users. Targets developers and product teams needing fiat-to-crypto user access…
Financial Health
StableStable · Hiring · 38% CAGR over 4y
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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
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Financial sub-scores
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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Provides an API platform that enables crypto wallets and fintech applications to issue branded debit and prepaid cards backed by stablecoins. Includes card management tools, virtual accounts, and…
Sells to B2B fintechs, crypto wallet providers and stablecoin-native payment apps seeking to offer branded debit, prepaid and payment card products to their own users. Targets both crypto-native…
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Computed from 5 filingsOperates an online cryptocurrency exchange and wallet platform enabling users to buy, sell, trade, send and store digital assets such as Bitcoin and Ethereum. Supports bank and card payments,…
Serves UK retail cryptocurrency investors and traders, with separate account options for business users needing access to digital assets and multi-currency crypto trading.
Financial Health
StrongStrong
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Computed from 5 filingsProvides investment management and advisory services focused on digital assets. Manages cryptocurrency investment funds and arbitrage strategies, and offers over‑the‑counter trading and liquidity…
Serves institutional investors seeking regulated digital-asset funds, plus cryptocurrency holders and counterparties needing OTC liquidity for locked tokens or large token trades.
Financial Health
StableStable · -66% CAGR over 4y
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Computed from 5 filingsOperates an online cryptocurrency trading platform offering spot trading and perpetual futures with leverage, account management and exchange infrastructure, and provides white‑label and…
Targets UK self-declared investment professionals, active crypto traders and institutional clients, including firms seeking white-label exchange infrastructure.
Financial Health
StableStable · -11% CAGR over 4y
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Computed from 3 filingsManages investment funds focused on digital assets and public equities. Operates a digital assets fund investing in seed-stage and liquid tokens, and a UCITS equities fund holding an equal-weighted…
Targets professional investors under FCA rules, including institutional and qualified investor clients interested in digital assets and equities funds; excludes US persons and people in the United…
Financial Health
StrongStrong
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Computed from 4 filingsProvides a financial services platform for businesses including multi‑currency accounts, international payments, foreign exchange services, cryptocurrency trading, and crypto payment processing,…
Sells to businesses needing multi-currency accounts, global payments, FX and crypto payment capabilities, including internationally trading companies and firms that accept, trade or convert crypto,…
Financial Health
StrongStrong · Hiring · 52% CAGR over 3y
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Provides quantitative trading and liquidity provision across FX, commodities and digital asset markets, including market making and OTC execution in spot, futures and options. Also offers treasury…
Serves institutional clients, companies and foundations across finance, digital assets and other industries, including organisations needing market liquidity, treasury support and strategic advisory…
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Computed from 5 filingsProvides electronic trading and market‑making services in global financial markets, specialising in exchange‑traded products and digital assets. Uses proprietary technology and risk management to…
Serves institutional financial market participants, including exchanges, trading platforms, brokers, asset managers and other counterparties across global ETP and digital asset markets.
Financial Health
WeakWeak · -10% CAGR over 4y
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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
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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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How London Blockchain And Crypto companies work and how to sell to them
What they do
London blockchain and crypto firms typically earn through a mix of subscription fees, transaction fees, custody or safeguarding charges, infrastructure licences and implementation work. Analytics and compliance providers often price by usage, monitored volume or account tier, while trading, payments and staking-adjacent models tend to attach revenue to flows, assets or operational events. Infrastructure sellers usually need integration, testing and assurance work before recurring revenue begins. That makes many engagements closer to regulated fintech procurement than ordinary software buying: technical due diligence, operational resilience, change control and evidence of controls can shape the deal as much as the headline feature set.
Who they sell to
Most sell to institutions rather than casual retail users: financial services firms, fintechs, digital-asset operators, enterprise technology teams and specialist investment functions. Common sponsors include CTOs, Heads of Engineering, Chief Compliance Officers, MLROs, CFOs, treasury leads and operations directors. Smaller customers may buy through founder-led evaluation or direct sales, but banks and larger platforms usually involve procurement, security review, legal review and compliance sign-off. Contract values tend to vary by risk and volume rather than headcount alone. Trials, sandboxes and limited-scope deployments are common, because buyers want proof that the service behaves properly before it touches customer assets or regulated workflows.
What they buy
Most blockchain and crypto firms tend to spend on compliance tooling, security, cloud infrastructure, identity checks, transaction monitoring, customer screening, case management and audit evidence. Engineering teams also buy observability, incident management, testing, data pipelines, API tooling and developer workflow software, particularly where uptime or transaction integrity affects customer confidence. Finance and operations teams need reconciliation, tax reporting, payments operations, insurance support, legal advice and specialist accounting. Recruitment services can fit where firms are adding compliance, security, engineering or operations capacity. Suppliers with experience selling into regulated fintech buyers usually have an easier conversation than generic software sellers relying on seat-count economics.
Why and how to sell to them
Buying intent often appears when firms move from pilot activity into institutional production, apply for or maintain FCA registration, expand custody or trading-related services, add compliance leadership, or win customers that impose heavier vendor diligence. Rule changes around financial promotions, the Travel Rule, stablecoins, market abuse and authorisation can also move budgets from discretionary experiments into operational controls. Outbound works better when it starts with risk, evidence and implementation burden rather than category slogans. Useful angles include reducing manual compliance work, shortening audit preparation, improving incident response, supporting enterprise procurement questionnaires, or helping technical teams prove that integrations are secure and observable.
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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