Companies Using Apollo.io in London: 119 Active Firms (2026)
London companies running sales-intelligence software use web-based prospecting and outreach tools across sales-led B2B markets in the capital.
Adoption tends to sit inside sales-led B2B organisations rather than consumer marketplaces. The technology is used for prospect discovery, contact enrichment, lead capture and outbound workflow management, usually alongside CRM, analytics and marketing-operations tools. Running this kind of stack signals that a company has moved beyond ad hoc founder selling: there is usually a repeatable go-to-market motion, a named revenue owner, and budget for paid prospecting rather than purely inbound demand. Engagements are typically team-level subscriptions used by business development, account executives and marketing operations, with value judged through pipeline quality, list hygiene and conversion from targeted outreach.
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Across London, 119 companies are actively trading with this sales-intelligence stack detected on their public websites. Reported employment totals 99 people, suggesting that visible adoption is concentrated among small commercial teams rather than very large employers. The sector mix is tilted towards software and services: SaaS accounts for 40.3% of the cohort, AI and machine learning for 24.4%, startups for 21.8%, IT services and managed services for 18.5%, and marketing agencies for 17.6%. That mix fits the tool’s use case: repeatable B2B selling, contact-led prospecting and measurable pipeline generation.
Running a sales-intelligence stack is not, by itself, a regulated activity, but it does put sales operations close to privacy and direct-marketing rules. London users handling business contact records need a defensible lawful basis under UK GDPR, clear retention policies and suppression processes for people who object to outreach. The ICO’s expectations on transparency and accountability matter where enrichment, tracking and automated sequencing are used together. Procurement tends to focus less on the prospecting interface and more on data provenance, CRM permissions, audit trails and whether outbound workflows can be governed without creating compliance workarounds.
Adoption appears tied to the maturing of outbound sales motions in London’s software and services market. Demand is likely to be shaped by sales-tool consolidation, inbox deliverability pressure and closer scrutiny of personal-data use, rather than by a simple appetite for higher contact volume. Smaller teams may keep using specialist prospecting layers where they lack in-house research capacity, while more mature revenue organisations tend to fold enrichment, workflow and attribution into a narrower operations stack. The likely pattern is selective retention: companies keep the tool where it improves targeting discipline, and drop it where outreach quality or governance becomes difficult to defend.
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 Apollo.io rises with company size across the trading companies in this cohort. 0% of the 532,485 companies with under 10 employees run Apollo.io (66 detected). 0.3% of the 15,364 companies with 10–50 employees run Apollo.io (51 detected). 0.2% of the 1,763 companies with over 50 employees run Apollo.io (3 detected). That is a 0.2% gap between the over 50 employees and under 10 employees bands.
119
Active firms
2026
6
Above £5M turnover
Trading firms
9
Median headcount
Filed accounts
269
Verified directors
Across this cohort
Top companies using Apollo.io 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 3 filingsDevelops a market intelligence platform that scans the internet to identify companies and provide B2B data. Offers sales lead generation tools, CRM data enrichment and refresh services, contact and…
Serves B2B companies, particularly enterprise clients, board-level decision makers, and sales and marketing teams seeking market intelligence, contact data, and lead generation across global markets.
Financial Health
StrongStrong · Hiring · 6% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides B2B data products including intent data, identity resolution, audience segmentation and campaign measurement. Aggregates data from a network of publishers and data providers to help…
Serves B2B sales, marketing and advertising teams, agencies, publishers and data/technology partners running account-based marketing, digital campaigns and campaign measurement.
Financial Health
StableStable · Hiring · 5% CAGR over 5y
Location
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Financial sub-scores
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
Location
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Financial sub-scores
Computed from 5 filingsDevelops cloud-based customer relationship management (CRM) software for sales and go-to-market teams. Platform provides customizable data models, workflow automation, AI-assisted search and…
Sells to B2B companies’ go-to-market, revenue, sales and business operations teams, especially teams managing customer data, outreach, pipelines and reporting.
Financial Health
StrongStrong · Growing, Hiring · 23% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsDevelops relationship intelligence software that integrates with email, calendar and CRM systems to automatically capture contact interactions, maintain contact data quality, and analyse relationship…
Serves B2B professional services firms, including legal, accounting, consulting and built environment organisations, targeting business development, marketing, partners and fee earners.
Financial Health
DistressedDistressed · -14% CAGR over 3y
Location
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Develops and operates a SaaS business automation platform using AI agents to manage sales pipelines, customer communications, and marketing workflows, with tools for email responses, SMS and WhatsApp…
Serves small and medium-sized businesses and agencies managing sales, marketing, recruitment, customer support and client communications, including agencies running sub-accounts for their own clients.
Financial Health
N/AN/A
Location
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Financial sub-scores
Computed from 5 filingsSupplies business and consumer marketing databases and email lists for direct marketing campaigns. Provides bulk email marketing, email campaign management, direct mail services, and data processing…
Sells to businesses, agencies and marketing teams needing B2B, consumer and international audience data for email and direct mail campaigns across the UK, Europe and worldwide.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDevelops digital marketing analytics and PPC management software. Platform aggregates data from advertising channels, automates reporting, tracks SEO performance, and provides lead intelligence tools…
Serves B2B customers, mainly digital marketing and PPC agencies, plus ecommerce and other businesses with sales and marketing teams managing paid search, SEO, social advertising, reporting and lead…
Financial Health
HealthyHealthy · Hiring · 16% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides digital lead generation and performance marketing services, using AI‑driven advertising campaigns, media buying, and landing pages to deliver sales‑ready customer leads to businesses on a…
Sells to fast-growing businesses and brands with marketing, sales and tech teams, plus agencies and BPOs, across sectors including home services, health insurance, online education, digital marketing…
Financial Health
StableStable
Location
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Financial sub-scores
Computed from 3 filingsDevelops AI software for recruitment agencies that analyses candidate databases, matches candidates to roles, and automates outreach to identify placement opportunities and generate recruiter leads…
Sells to recruitment agencies, staffing firms and recruiter teams seeking AI-supported revenue growth from candidate and client databases.
Financial Health
StableStable · Hiring · 53% CAGR over 2y
Location
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Financial sub-scores
Computed from 4 filingsProvides an event management platform for conferences and trade shows, offering tools for registration, ticketing and onsite check‑in, attendee networking, mobile event apps, exhibitor and sponsor…
Serves B2B event organizers, including trade show and exhibition companies, associations, conference and congress organisers, medical event teams, media companies, nonprofits and professional…
Financial Health
WeakWeak · -31% CAGR over 3y
Location
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187 more companies and their verified directors are in the file
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Key facts
About 5% of the trading cohort reports turnover above £5M (6 of 119 firms) — the rest sits below that revenue band.
15% of the cohort was incorporated since 2022 (18 firms), so a sizeable share is in its first few filing cycles.
64.7% of the London cohort also run tag-management software, and 63.0% also run web analytics tooling, which points to sales-intelligence use alongside measurable acquisition funnels.
Cloud delivery and security tooling appears in 61.3% of the cohort, suggesting that many users sit in web-led operating models rather than offline sales environments.
SaaS is the largest sector tag at 40.3%, followed by AI & Machine Learning at 24.4% and Startup at 21.8%; the tags overlap, so these categories should not be read as mutually exclusive.
28.6% fall into the highest financial-health category, while 7.6% are distressed, giving the London cohort a visible spread from better-capitalised operators to firms under pressure.
269 verified contacts are attached to the cohort, making decision-maker coverage relatively concentrated across 119 active firms.
What else do Apollo.io users run?
Share of the 119 Apollo.io-running UK companies where each technology was also detected. As of June 2026.
Who runs Apollo.io 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.
9
Median headcount
£548.2K
Median UK turnover
5%
Above £5M turnover
18
Incorporated since 2022
Verified directors — included in the file
Director names and roles for these 198 companies, alongside financials and websites, in one Excel + CSV file.
How Apollo.io 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.
Sources
- Sales Intelligence Market Size & Share Analysis - Growth Trends And Forecast (2026 - 2031)
- Market Size (2026): USD 4.99 Billion.
- Market Size (2031): USD 9.15 Billion.
- Growth Rate (2026 - 2031): 12.89 % CAGR.
- Largest Market: North America.
- Fastest Growing Market: Asia Pacific.
Apollo.io is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
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Frequently asked questions
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