Company lists · Data verified August 2026

Top 25 B2B SaaS companies based in London, United Kingdom

Name: B2B SaaS companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 106 companies tracked

There are 106 B2B SaaS companies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase 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. Data current as of August 28, 2026.

106Companies

1,074Contacts tracked

267Verified emails

104Mobile numbers

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The 25 largest B2B SaaS companies based in London, United Kingdom

Ranked by team size

Top 25 of 106 B2B SaaS companies based in London, United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Synacor	London	201-500	182	81
2	Onlyoffice	London	51-200	125	2
3	Optimiser	London	51-200	56	10
4	Rocket Saas	London	51-200	38	25
5	EYONA	London	51-200	30	19
6	Gripped B2B Digital Marketing Agency For Saas & Tech	London	11-50	28	17
7	Stratos Technologies	London	11-50	25	17
8	Ascendx	London	1-10	23	10
9	Itouchvision	London	11-50	22	1
10	Robosme	London	11-50	14	7
11	Digital Litmus	London	11-50	13	5
12	Broadcasting Platforms	London	51-200	10	2
13	Smarty Software	London	11-50	9	1
14	Demand Studio	London	51-200	7	5
15	Blissgrowth	London	1-10	7	5
16	Entranet Cloud Platform	London	11-50	7	2
17	Upakram	London	1-10	7	1
18	Square House Technologies	London	1-10	6	2
19	Cloud 9 Assist LTD	London	1-10	4	4
20	Shoonyata	London	11-50	4	2
21	Team 4	London	1-10	4	1
22	Ouiteo Technologies	London	1-10	4	1
23	Intentify Demand	London	11-50	3	3
24	Lock And Quay Collective	London	1-10	3	1
25	Bluespidy	London	1-10	3	1

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 28, 2026

1-10Median size (employees)

LondonLargest hub · 100 HQs

104Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

B2B SaaS companies by metro in the United Kingdom

Metro	Companies
B2B SaaS companies in London	100
B2B SaaS companies in Manchester	11
B2B SaaS companies in Reading	5
B2B SaaS companies in Edinburgh	4
B2B SaaS companies in Birmingham	3
B2B SaaS companies in Milton Keynes	3
B2B SaaS companies in Cheltenham	3

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “B2B SaaS companies”, with match quality audited by blind human judging, and headquartered in London, United Kingdom.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many B2B SaaS companies are there based in London, United Kingdom?

There are 106 B2B SaaS companies headquartered in London, United Kingdom as of August 2026 (RevenueBase).

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 is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.