Companies Using PostHog in London: 111 Active Firms (2026)
London companies running web analytics on public websites measure user behaviour, funnel performance and digital conversion.
Adoption of event-based product analytics usually sits with product and engineering rather than pure marketing analytics. Companies running this stack tend to sell software, online services, marketplaces or data-led business-facing products, where activation, retention and conversion are managed through product changes as much as campaigns. The buying centre is cross-functional: product managers define events, engineers instrument them, and growth or revenue teams use the results to prioritise experiments. Use of this tooling also points to a company with enough traffic, internal development capacity and go-to-market discipline to care about behavioural cohorts, not just page-level reporting.
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London has 111 actively trading companies running this product-analytics stack on public websites. Reported employment sums to 1,044 people, giving the adoption base a small-company tilt rather than an enterprise-heavy profile. Software-as-a-service accounts for 56.8% of the cohort; startup-oriented companies for 39.6%; and AI and machine learning for 25.2%. That mix fits a buyer group using event data to refine onboarding, trial conversion and self-serve product journeys, while still leaving a narrower band of later-stage scale-up and fintech adopters.
Public-site analytics creates procurement questions that are less about licence cost and more about data handling. Event capture often touches cookie consent, user identifiers, retention settings and transfers between marketing, product and engineering systems. For business software and marketplace operators, the practical issue is governance: which teams can create events, how customer attributes are masked, and whether analytics outputs are used in sales or support workflows. Buyers in this cohort tend to prefer tools that can be instrumented by engineers but read by non-technical teams, so implementation choices often sit between product operations and revenue operations.
Adoption appears to be shifting from simple website reporting towards product-led measurement, especially among software and data-led service firms that need to connect acquisition with activation. Early-commercial companies tend to adopt this stack before their reporting layer is fully settled, which can create messy event taxonomies and later migration work. Over time, buyers are likely to ask for cleaner governance, fewer duplicate scripts and clearer links into billing, customer-success and experimentation workflows. Consolidation may also favour platforms that reduce hand-offs between product analytics, feature management and revenue reporting, though many smaller users will keep a lighter setup.
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
Adoption by company size
Adoption of PostHog rises with company size across the trading companies in this cohort. 0% of the 532,485 companies with under 10 employees run PostHog (71 detected). 0.2% of the 15,364 companies with 10–50 employees run PostHog (33 detected). 0.2% of the 1,763 companies with over 50 employees run PostHog (3 detected). That is a 0.2% gap between the over 50 employees and under 10 employees bands.
111
Active firms
2026
6
Above £5M turnover
Trading firms
6
Median headcount
Filed accounts
246
Verified directors
Across this cohort
Top companies using PostHog in London
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 5 filingsOperates an online wholesale marketplace connecting independent retailers with brands and suppliers. The platform enables businesses to browse and order wholesale products including homeware, beauty…
Serves independent retailers buying wholesale stock for resale, and independent consumer goods brands seeking retailer customers, across homeware, gifts, fashion, beauty, food, pets and kids in the…
Financial Health
StrongStrong · Growing, Hiring · 92% CAGR over 4y
Location
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Computed from 5 filingsDevelops software for creating interactive product demos, videos, and visual presentations. The platform captures product workflows via browser or desktop tools and uses AI-assisted editing to…
Serves B2B product-led companies, targeting go-to-market, marketing, product, sales, pre-sales, customer success, enablement and training teams that need to communicate product value to buyers and…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
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Computed from 5 filingsDevelops and operates an online event management and ticketing platform that enables organisers to sell tickets, manage registrations and memberships, host virtual events, and use marketing tools,…
Serves event organisers and organisations running concerts, conferences, festivals, workshops, awards, online classes and membership programmes, from self-service creators to brands needing…
Financial Health
StableStable · -10% CAGR over 4y
Location
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Computed from 5 filingsDevelops and operates a SaaS platform for billing, e‑commerce and business process automation. Software supports invoicing, subscription management, service provisioning, client management and…
Serves B2B subscription and service businesses, including web hosting providers, SaaS companies, digital agencies and other online service providers with recurring client relationships.
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 4y
Location
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Computed from 3 filingsDevelops financial business intelligence software for accountants and CFOs. Platform connects to accounting systems to generate automated financial reports, dashboards, forecasts, consolidated…
Serves accountants, accounting firms, CFOs and finance teams, including businesses managing reporting, forecasts, dashboards, consolidation, valuation, and ESG indicators.
Financial Health
StrongStrong
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Computed from 2 filingsDevelops AI models that generate synthetic audiences to simulate consumer reactions to products, marketing messages, and campaigns. The platform enables businesses to test ideas and obtain market…
Sells to B2B customer insight, marketing, strategy and product teams in consumer-facing organisations, including brands and agencies that need rapid consumer feedback on products, messages and…
Financial Health
StrongStrong · Hiring · 175% CAGR over 1y
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Computed from 4 filingsProvides a behavioural AI platform that measures consumer attention, emotion and memory in response to advertising. Uses eye‑tracking, facial coding, implicit tests and simulated social and video…
Sells to brand marketing and insights teams, creative and media agencies, and digital advertising platforms focused on campaign effectiveness for social, video, and CTV advertising.
Financial Health
StrongStrong · Hiring · 33% CAGR over 3y
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Computed from 5 filingsProvides an online market research platform that enables businesses to create short surveys, target demographic audiences, collect responses from a mobile user panel, and analyse consumer insights…
Sells to businesses and agencies needing rapid consumer research, including brand, marketing, product, creative, strategy and insights teams running surveys for brand tracking, concept testing,…
Financial Health
StrongStrong · Hiring · 7% CAGR over 4y
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Computed from 3 filingsDevelops cloud software for finance teams that consolidates data from multiple Xero, QuickBooks and other accounting systems. Provides tools for group financial reporting, intercompany…
Sells to B2B finance teams, group finance directors, accountants and bookkeepers managing multi-entity organisations that use Xero, QuickBooks or Pennylane.
Financial Health
HealthyHealthy · Hiring · 15% CAGR over 2y
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Computed from 5 filingsOperates an online platform for businesses to order corporate catering and workplace food services, connecting companies with catering suppliers and providing recurring meal plans, office pantry…
Sells to businesses, office managers and workplace teams arranging meals, events and pantry provision for employees across the UK, Ireland, Netherlands, Germany, Australia and Singapore.
Financial Health
StableStable · -78% CAGR over 3y
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Computed from 5 filingsDevelops and operates a software platform for managing employee benefits. Enables organisations to administer global benefit programmes, enrol staff in core and flexible benefits, manage allowances…
Sells to businesses with global workforces, especially HR and finance teams at enterprises and fast-growing scale-ups managing employee benefits, insurance and allowances across multiple countries.
Financial Health
StableStable · Hiring · 12% CAGR over 4y
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Computed from 2 filingsDevelops and operates a software platform for building and running automated workflows and AI agents. Provides tools to design logic, create user interfaces, integrate third‑party services, and…
Serves founders, engineers, builders and service agencies seeking to create client-facing software, branded portals and internal automations, including fast-growing companies and teams using…
Financial Health
StableStable · Hiring · 75% CAGR over 1y
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Computed from 5 filingsProvides a cybersecurity platform for vulnerability management, attack surface monitoring and cloud security. Scans infrastructure, web apps, APIs and containers to detect exposed assets,…
Serves B2B security and IT teams at companies with internet-facing infrastructure, cloud environments, web apps and APIs, especially lean teams managing security and compliance requirements such as…
Financial Health
StableStable · Hiring · 60% CAGR over 4y
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Provides a spend management platform that links corporate credit cards with software for tracking expenses, collecting receipts, processing invoices, and reconciling transactions. Includes budgeting…
Sells to finance teams, CFOs and operations leaders at businesses managing corporate card spend, expenses, invoices and multi-entity or cross-border operations, with integrations for ERP, HRIS and…
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Computed from 3 filingsProvides employer-funded digital health services supporting employees with reproductive, hormonal and midlife health. Offers care navigation, educational resources, and access to clinicians and…
Sells B2B to global employers and HR/benefits teams seeking health support for employees and dependants across family building, parenting, men’s health, menopause and midlife needs.
Financial Health
StableStable · 3% CAGR over 2y
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Provides software for managing subcontractor procurement in construction projects, including tendering, scope documentation, bid comparison, contract creation, electronic signatures, vendor…
Sells to B2B construction main contractors and builders, particularly procurement, commercial and project teams managing subcontractor spend, tenders, contracts and vendor performance.
Financial Health
N/AN/A
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Develops cloud-based HR software for recruiting and employee management. Platform includes multi-board job posting, applicant tracking, candidate sourcing tools, interview management, onboarding…
Serves HR, recruiting and people operations teams at businesses of varying sizes across industries, including companies hiring at scale and managing employees in 100+ countries.
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N/AN/A
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Computed from 5 filingsDevelops an open‑source time-series database designed for high‑throughput data ingestion and low‑latency querying. Provides SQL-based tools, multi-tier storage, and integrations for analyzing large…
Sells to developers, data engineering teams and enterprises running high-volume time-series workloads, especially in financial trading, aerospace, mission-critical operations and real-time analytics…
Financial Health
WeakWeak · Hiring · 28% CAGR over 4y
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Computed from 2 filingsDevelops AI-powered digital workers for sales and customer engagement. Software automates prospect outreach, lead qualification, and phone interactions, integrating with business systems to manage…
Serves B2B sales, RevOps and go-to-market leaders at companies seeking to scale pipeline generation, prospect engagement and customer touchpoints, with messaging aimed at enterprise revenue teams.
Financial Health
DistressedDistressed · 0% CAGR over 1y
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Computed from 5 filingsDevelops AI-powered email assistant software that integrates with Gmail and Outlook to organise inbox messages, categorise emails, generate draft replies in a user’s writing style, and capture…
Sells to individual professionals, teams, and small to medium-sized businesses using Gmail or Outlook, with options for both self-serve users and organisational buyers seeking email and meeting admin…
Financial Health
StableStable · -31% CAGR over 4y
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Computed from 5 filingsDevelops an AI platform providing a collaborative workspace to interact with multiple language models and manage prompts and projects. Offers developer APIs for web scraping and search data for RAG…
Serves B2B customers worldwide, including developer teams, AI product builders, operations teams, and businesses using LLMs, web data, SEO, security, network and productivity workflows.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
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Computed from 5 filingsProvides a cloud platform for managing and analysing engineering test data. Ingests measurements and configuration metadata from test rigs, simulations, and labs, enabling real‑time analysis,…
Serves B2B R&D and engineering teams in manufacturing and energy, including heads of R&D, engineering leads, software/data engineers, systems engineers and test engineers working with lab, field and…
Financial Health
StrongStrong · Hiring · 12% CAGR over 4y
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Computed from 3 filingsDevelops browser-based cybersecurity software that monitors user browser sessions to detect and respond to threats such as phishing, malicious extensions, credential theft, and account takeover,…
Sells to B2B security leaders, CISOs, security operations and IT teams at organisations whose employees use browsers, SaaS and cloud accounts, including companies exposed to phishing, account…
Financial Health
StableStable · Hiring · 143% CAGR over 2y
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Computed from 5 filingsProvides an online learning platform offering browser-based coding labs, virtual development environments, and auto‑graded assessments for teaching AI, data science, cybersecurity, and software…
Sells to B2B and education buyers delivering technical training, including enterprises upskilling workforces, teams training data, AI, cybersecurity and software skills, plus colleges, universities,…
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
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Develops software-as-a-service for commercial insurance brokers, insurers and MGAs. Platform provides digital risk capture, quote and bind automation, delegated authority management, AI document…
Serves B2B customers in commercial insurance, including brokers, delegated authority underwriters, insurers and MGAs, particularly teams involved in open market broking and insurance distribution.
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Computed from 2 filingsDevelops AI computer vision software that converts existing CCTV cameras into sensors, generating data on footfall, occupancy and movement patterns. Provides analytics dashboards and alerts used by…
Serves B2B and public-sector property stakeholders, including multi-asset funds, mixed-use landlords, office and co-working operators, estate managers, and resellers managing visitor-heavy spaces.
Financial Health
WeakWeak · 0% CAGR over 1y
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Develops AI-powered software operations tools that analyse logs, traces and code data to investigate production incidents, identify root causes, predict system failures, and generate suggested fixes…
Serves B2B software organisations with sizeable engineering, SRE and platform teams, including CTOs, heads of reliability and engineers responsible for incident response, observability and production…
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Computed from 5 filingsOperates an online travel booking platform specialising in halal‑friendly holidays. Lists and sells hotel, resort and villa accommodation with features such as halal food, women‑only facilities and…
Serves Muslim consumers planning leisure travel, including families, couples and Umrah visitors seeking halal-friendly holidays, resorts, villas and city breaks worldwide.
Financial Health
WeakWeak
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Computed from 4 filingsProvides business financing through a credit facility that enables companies to pay supplier invoices upfront and repay over 1–12 months. Platform includes invoice upload, supplier and international…
Serves growing businesses across 40+ industries, including underserved sectors such as construction, logistics and legal, with working-capital needs tied to suppliers, inventory, marketing and growth…
Financial Health
StableStable · -69% CAGR over 3y
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Provides a payment automation platform for businesses and accountants, enabling invoice collection, direct debit payments, credit control, and automated payment chasing. Integrates with accounting…
Serves accounting firms, bookkeepers and invoice-based businesses, plus software platforms needing payment workflows. Targets finance teams and professional services practices using tools such as…
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Computed from 5 filingsProvides video advertising technology for delivering and streaming video ads across the open web. Offers programmatic video ad formats, campaign delivery, media buying, and performance measurement…
Serves global brands, advertising and media agencies, and publishers running programmatic open-web video campaigns, targeting marketing and media buying teams with digital advertising budgets.
Financial Health
WeakWeak · -61% CAGR over 4y
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Develops a platform and API for creating real-time interactive AI video avatars. Provides tools to generate photorealistic digital agents that converse with users and integrate into applications for…
Sells to businesses and developer teams building customer support, sales, training, language tutoring and medical service experiences, including teams seeking API or no-code integration for…
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Computed from 3 filingsDevelops AI-powered software that automatically generates and maintains visual end‑to‑end tests for web applications by recording user interactions, tracking executed code paths, and replaying…
Sells to B2B software engineering, QA, and developer experience teams at organizations building complex web applications, from startups to larger technology companies.
Financial Health
WeakWeak · Hiring · 29% CAGR over 2y
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Computed from 5 filingsDevelops help desk and customer support software that manages support tickets and communications across channels such as email, chat, and social media. Provides AI tools for chatbots, agent…
Serves B2B support, service desk and IT teams at organisations needing customer or employee support, especially regulated enterprises requiring security, compliance, data privacy, private cloud,…
Financial Health
DistressedDistressed · -63% CAGR over 4y
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Computed from 3 filingsProvides an online platform for content creators, brands and agencies to manage influencer marketing campaigns, including collaboration tracking, contracts, messaging, creator discovery, campaign…
Serves professional and aspiring content creators, influencer marketing teams at brands, and creator management agencies handling social media, UGC, photoshoot, video and event collaborations.
Financial Health
WeakWeak · -59% CAGR over 2y
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Computed from 3 filingsOperates an online professional network connecting freelance creatives and independent professionals with companies. Provides tools for job discovery, contractor hiring, project management,…
Serves independent creative freelancers seeking clients and project admin tools, plus companies and teams hiring, managing and paying flexible contractor workforces; also addresses partners running…
Financial Health
HealthyHealthy · 0% CAGR over 2y
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Computed from 4 filingsProvides data, analytics, and quantitative research on cryptocurrency derivatives. Offers volatility surfaces, options and futures analytics, market data APIs, and pricing models used by financial…
Sells to professional market participants in crypto markets, including asset managers, hedge funds, banks, DeFi protocols, and institutional investors needing crypto derivatives data, research, and…
Financial Health
StrongStrong · 91% CAGR over 2y
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Provides an online sales and affiliate marketing platform for digital products and services. Offers tools for payment processing, order management, sales funnels, upsells, analytics, and an affiliate…
Serves online product vendors and affiliate marketers, including digital entrepreneurs and businesses selling software, supplements, memberships, downloads, eBooks, events and seminars.
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Computed from 5 filingsProvides insurance infrastructure and services for brands and insurers, including licensing, regulatory operations, claims management, and API-based software. Enables partners to develop, launch, and…
Serves B2B insurance carriers, underwriters, consumer brands and affinity partners seeking specialty insurance distribution across mobility, travel, devices, retail, booking and registration channels.
Financial Health
StrongStrong
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Computed from 5 filingsProvides flexible funding products for small and medium-sized businesses, including revolving credit facilities and debt consolidation lines. Offers tools and resources such as performance…
Serves UK SMEs and founders of growing businesses, with partner channels and introducers also addressed for referrals and business support.
Financial Health
StrongStrong · Growing, Hiring · 43% CAGR over 4y
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Computed from 5 filingsDevelops AI software that maps a firm’s roles, workflows, communications and documents to generate customised AI assistants, prompts and automated workflows for employees. Provides configuration,…
Sells to firms adopting AI across investment banking, specialty insurance, executive search, venture capital, consultant relations, law, advisory, defense tech and charities, targeting teams from…
Financial Health
StrongStrong · Hiring · 17% CAGR over 5y
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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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Computed from 5 filingsProvides an online professional development platform for schools and multi-academy trusts, offering instructional coaching tools, video observation, feedback workflows, and analytics to support…
Serves schools and multi-academy trusts, selling to education leaders responsible for teacher professional development, coaching and training.
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StrongStrong · Growing, Hiring · 66% CAGR over 4y
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Computed from 3 filingsDevelops real-world evidence data platforms and analytics for behavioral health. Aggregates and analyses de‑identified electronic health record data through the NeuroBlu database to support clinical…
Serves B2B healthcare and life sciences customers, including behavioral health providers, researchers, health systems, and pharmaceutical teams using real-world evidence for treatment development,…
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HealthyHealthy · Hiring · 6% CAGR over 2y
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Computed from 3 filingsDevelops software for managing residential property conveyancing transactions. Platform connects estate agents, mortgage brokers, conveyancing law firms and clients, providing referral management,…
Serves a mix of B2B and B2C customers in property transactions: estate agencies, mortgage brokerages, conveyancing law firms, and home buyers or sellers needing conveyancing support.
Financial Health
StableStable · Hiring · 78% CAGR over 2y
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Computed from 5 filingsOperates an online travel booking platform offering international holiday packages, guided tours and cruise itineraries. Provides listings of travel deals, destinations and pricing, enabling users to…
Sells to leisure travellers and holidaymakers booking worldwide tours, cruise holidays, flights and package holidays, including budget, luxury, all-inclusive, last-minute and no-fly cruise options.
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StableStable · Hiring · 8% CAGR over 5y
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Computed from 5 filingsProvides an online payment and booking platform for tourism businesses such as hotels, tour operators and activity providers. Enables acceptance of international card payments online, in advance or…
Serves B2B travel and tourism businesses of all sizes, including hotels, hostels, large hotel chains, retreats, tour operators and activities providers, especially those taking bookings and payments…
Financial Health
StableStable · Hiring · 2% CAGR over 4y
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Computed from 5 filingsOperates a mobile app and platform for locating, reserving and paying for parking spaces in car parks and on streets. Provides pre‑booked parking, pay‑per‑minute access via QR code, and monthly…
Serves drivers needing short-term, street or monthly parking for commutes, appointments and leisure trips, alongside businesses with off-street parking spaces in urban areas.
Financial Health
StableStable · -13% CAGR over 4y
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Computed from 3 filingsProvides a software platform for professional services firms to manage introducer relationships and client referrals. Features include referral workflow management, compliance record‑keeping,…
Sells to UK regulated professional services firms, including accountancy practices, financial advisers, wealth managers, solicitors, corporate finance advisers, mortgage advisers, protection…
Financial Health
HealthyHealthy · Hiring · 65% CAGR over 2y
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Computed from 4 filingsProvides sales training, certification and software based on the MEDDPICC sales qualification methodology. Offers playbooks, online courses and a SaaS operating system with opportunity management,…
Serves B2B companies with sales, revenue and go-to-market teams, targeting sales leaders, sellers and enablement teams adopting MEDDPICC across their organisation.
Financial Health
StableStable · 0% CAGR over 3y
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Key facts
About 5% of the trading cohort reports turnover above £5M (6 of 111 firms) — the rest sits below that revenue band.
25% of the cohort was incorporated since 2022 (28 firms), so a sizeable share is in its first few filing cycles.
75.7% of the London cohort also runs traffic-routing and security tooling, suggesting product analytics is often part of a wider website-performance stack.
Tag-management tooling appears alongside the analytics implementation at 65.8% of firms, while 50.5% also run a general web-analytics package.
SaaS tags apply to 56.8% of the cohort and startup tags to 39.6%; tags overlap, so the mix tilts towards product-led and early-stage business models.
AI & Machine Learning is tagged on 25.2% of the cohort, compared with 10.8% tagged as fintech.
Financial-health classifications include stable at 26.1%, weak at 19.8% and distressed at 9.0%, with 10.8% lacking enough history for a rating.
What else do PostHog users run?
Share of the 111 PostHog-running UK companies where each technology was also detected. As of June 2026.
Who runs PostHog in the UK?
By sector
Sectors overlap, so shares need not sum to 100%.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
6
Median headcount
£529.8K
Median UK turnover
5.4%
Above £5M turnover
28
Incorporated since 2022
Verified directors — included in the file
Director names and roles for these 159 companies, alongside financials and websites, in one Excel + CSV file.
How PostHog usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. 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.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
PostHog is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
PostHog elsewhere
Frequently asked questions
How many companies in London use PostHog?
How is PostHog usage detected?
What kinds of companies use PostHog in London?
What do PostHog users in London also run?
How fresh is this data?
Can I get contact details for these companies?
Buy all 159 companies as a spreadsheet.
One Excel/CSV file with company details, websites and key data — yours to download and use.