Company lists · Data refreshed August 2026
Top 25 B2B SaaS companies based in London, United Kingdom
RevenueBase identified 106 B2B SaaS companies headquartered in London, United Kingdom as of August 2026 and tracks 1,074 professional contacts across them, including 267 with verified work emails and 104 with mobile numbers. London is the largest hub.
This list covers B2B SaaS companies headquartered in London, United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed August 30, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest B2B SaaS companies based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 182 contacts → | ||||
Indirect evidence “Synacor is a cloud-based software and services company headquartered in Buffalo, New York with offices across the globe.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 2 | 125 contacts → | ||||
Indirect evidence “ONLYOFFICE is a project developed by experienced IT experts from Ascensio System SIA, leading IT company with headquarters in Riga, Latvia.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 3 | 56 contacts → | ||||
Indirect evidence “Optimiser CRM is an all-in-one robust platform which lets you manage and make intelligent decisions about your business for growth.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 4 | 38 contacts → | ||||
Strong evidence “SaaS marketing strategy and execution team for B2B brands with limited in-house resources.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 5 | 30 contacts → | ||||
Strong evidence “Eyona is a multi-product company specialising in B2B SaaS products.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 6 | 28 contacts → | ||||
Strong evidence “Gripped is a digital first sales & marketing agency for B2B SaaS, technology & IT companies.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 7 | 25 contacts → | ||||
Indirect evidence “STRATOS is a London-based technology company founded in 2022.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 8 | 23 contacts → | ||||
Indirect evidence “An enterprise cloud software company that helps teams solve their problems by boosting productivity and transforming tech stacks on CRM platforms such as Salesforce, Dynamics 365…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 9 | 22 contacts → | ||||
Indirect evidence “iTouchVision is one of the world's leading cloud-based service providers with innovation & excellence at its base.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 10 | 14 contacts → | ||||
Indirect evidence “Robosme - CRM to Win Easy to use cloud CRM that automates your business and benefits every process you touch the customer.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 11 | 13 contacts → | ||||
Strong evidence “We help ambitious B2B Tech & SaaS companies to grow faster with connected sales and marketing.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 12 | 10 contacts → | ||||
Indirect evidence “Broadcasting Platforms is a streaming and marketplace services provider.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 13 | 9 contacts → | ||||
Partial evidence “Smarty Software is a SaaS company based in the City of London, which mainly provides cloud accounting and cloud CRM solution services.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 14 | 7 contacts → | ||||
Partial evidence “Demand Studio is a B2B marketing services company with a highly experienced team and 250+ operational resources worldwide.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 15 | 7 contacts → | ||||
Partial evidence “We ideate, build and scale industry winning B2B software technology companies with the best second-time founders.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 16 | 7 contacts → | ||||
Indirect evidence “Entranet, is a pioneering Cloud ERP Solution dedicated to delivering business applications over the internet.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 17 | 7 contacts → | ||||
Indirect evidence “Upakram provides comprehensive end-to-end CRM consulting services, specializing in Salesforce and other cloud-based solutions.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 18 | 6 contacts → | ||||
Indirect evidence “Software Solutions Through building and supporting other businesses, our company has grown from its small beginnings to becoming a trusted and renowned field leader in…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 19 | 4 contacts → | ||||
Indirect evidence “Cloud 9 Assist Ltd develop a wide range of hosted online applications for businesses encompassing areas such as CRM, Order Processing, Project Management, Helpdesk, Expense Forms…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 20 | 4 contacts → | ||||
Indirect evidence “Shoonyata's mission is to make power of innovation and software affordable to all.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 21 | 4 contacts → | ||||
Strong evidence “We're a small specialist B2B SaaS Marketing Agency.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 22 | 4 contacts → | ||||
Strong evidence “Ouiteo Technologies is a B2B Software-as-a-Service (SaaS) provider specializing in business process automation using artificial intelligence and machine learning.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 contacts → | ||||
Strong evidence “Intentify Demand is a provider of demand and lead generation services, specialising in B2B sectors such as SaaS, IT technology, FinTech, Martech and HR Tech.” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 24 | 3 contacts → | ||||
Strong evidence “At Lock and Quay Collective, we specialize in the art of transforming intangible assets into tangible growth, focusing on partnering with businesses in the B2B SaaS and e-learning…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
| 25 | 3 contacts → | ||||
Indirect evidence “BlueSpidy Social Office is a single sign-on web-based application delivering tools for SMEs to manage customers, sales and suppliers, people, products and projects, documents…” Source: RevenueBase Database · checked Aug 30, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: B2B SaaS companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names B2B SaaS companies.
- Partial evidence
- Its own public description names part of B2B SaaS companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name B2B SaaS companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 106 B2B SaaS companies based in London, United Kingdom
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B2B SaaS companies based in London, United Kingdom at a glance
As of Aug 30, 2026Companies by employee count
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among B2B SaaS companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in London, United Kingdom whose own description of what they do matches “B2B SaaS companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names B2B SaaS companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among B2B SaaS companies, and records with no verified work email. Companies headquartered outside London are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 267 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on August 30, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
B2B SaaS companies by metro in the United Kingdom
- B2B SaaS companies in London100
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names B2B SaaS companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many B2B SaaS companies are there based in London, United Kingdom?
RevenueBase identified 106 B2B SaaS companies headquartered in London, United Kingdom as of August 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Synacor, headquartered in London, tops this list with the largest team on record.
Which city has the most B2B SaaS companies?
London leads with 100 headquartered companies, followed by Manchester (11) and Reading (5).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 267 verified decision-maker contacts tracked across these 106 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 30, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.