Company lists · Data verified August 2026

Top 25 Cloud communication software companies based in the United Kingdom

Name: Cloud communication software companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 234 companies tracked

There are 234 cloud communication software companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 5,769 professional contacts across them, including 2,128 with verified work emails and 728 with mobile numbers. London is the largest hub.

This list covers cloud communication software companies headquartered in the 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.

234Companies

5,769Contacts tracked

2,128Verified emails

728Mobile numbers

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The 25 largest cloud communication software companies based in the United Kingdom

Ranked by team size

Top 25 of 234 cloud communication software companies based in the 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	Shoretel	White Waltham Maidenhead	1,001-5,000	690	6
2	Onecom	Whiteley	501-1,000	650	437
3	Alianza	Enfield	501-1,000	605	293
4	Imimobile Part Of Webex	London	1,001-5,000	436	54
5	Calltower	London	201-500	226	128
6	Hiya INC	London	51-200	201	96
7	Synacor	London	201-500	182	81
8	Vocovo	Cheltenham	51-200	165	107
9	Luware	London	51-200	154	110
10	Elite Group	Chorley	51-200	151	35
11	Daktela	Chester	51-200	98	72
12	Metaswitch Networks	Enfield	501-1,000	92	24
13	Wavecrest	London	51-200	92	18
14	Gradwell	West Bath	51-200	85	43
15	Sipcom	London	501-1,000	84	28
16	Telappliant	Manchester	51-200	67	44
17	Britannic	Guildford	51-200	65	35
18	Nebula	Guildford	51-200	60	29
19	Digitalk	Milton Keynes	51-200	58	32
20	Firstcom Europe LTD	Bolton	51-200	55	40
21	Unify Square	Leeds	n/a	44	18
22	Microtalk	London	11-50	44	9
23	Sytel LTD	Aylesbury Bucks	11-50	41	12
24	SVL	East Kilbride	11-50	35	18
25	Telogo Communications LTD	London	51-200	35	2

Showing 25 of 234 cloud communication software companies based in the United Kingdom

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Cloud communication software companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 67 HQs

728Contacts with mobile numbers

6Emails re-verified in last 30 days

Companies by employee count

1-10

105

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Cloud communication software companies by metro

Metro	Companies
Cloud communication software companies in London	67
Cloud communication software companies in Manchester	7
Cloud communication software companies in Bournemouth	5
Cloud communication software companies in Poole	4
Cloud communication software companies in Milton Keynes	4
Cloud communication software companies in Leicester	4
Cloud communication software companies in Birmingham	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 “cloud communication software companies”, with match quality audited by blind human judging, and headquartered in the 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; 6 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 cloud communication software companies are there based in the United Kingdom?

There are 234 cloud communication software companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Shoretel, headquartered in White Waltham Maidenhead, tops this list with the largest team on record.

Which city has the most cloud communication software companies?

London leads with 67 headquartered companies, followed by Manchester (7) and Bournemouth (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 2,128 verified decision-maker contacts tracked across these 234 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.