Company lists · Data verified August 2026

Top 25 Api and integration platform companies based in London, United Kingdom

Name: Api and integration platform 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 45 companies tracked

There are 45 api and integration platform companies headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 998 professional contacts across them, including 385 with verified work emails and 104 with mobile numbers. London is the largest hub.

This list covers api and integration platform 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.

45Companies

998Contacts tracked

385Verified emails

104Mobile numbers

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The 25 largest api and integration platform companies based in London, United Kingdom

Ranked by team size

Top 25 of 45 api and integration platform 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	TYK	London	51-200	124	70
2	NTT Ltd. Cloud	London	201-500	112	58
3	Xiatech	London	51-200	93	46
4	Integrella	London	51-200	84	40
5	Infoteck Solutions	London	51-200	71	15
6	Patchworks	London	51-200	66	29
7	Pace Integration	London	51-200	46	30
8	ONEIO	London	51-200	45	36
9	Turbosoft Limited	London	11-50	27	5
10	Thinkdata Works	London	51-200	14	7
11	Cloudorizon	London	11-50	12	11
12	Switchboard	London	11-50	12	6
13	Quadcorps LTD	London	11-50	10	7
14	Ainsys	London	11-50	9	1
15	Ledgerscope	London	11-50	6	5
16	ACUTO	London	1-10	5	1
17	Fixspec	London	1-10	4	1
18	Connectorly	London	1-10	3	3
19	Apiway	London	1-10	3	2
20	Huro Data Technologies LTD	London	1-10	3	2
21	Attlaz	London	1-10	3	2
22	Flexiweb.co Flexible WEB Strategies LTD	London	1-10	2	2
23	OOLYS	London	11-50	2	1
24	Dextcloud	London	1-10	2	1
25	Sambrands	London	1-10	2	1

Showing 25 of 45 api and integration platform companies based in London, United Kingdom

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Api and integration platform companies based in London, United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 45 HQs

104Contacts with mobile numbers

1Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

Api and integration platform companies by metro in the United Kingdom

Metro	Companies
Api and integration platform companies in London	45
Api and integration platform companies in Manchester	4
Api and integration platform companies in Reading	2
Api and integration platform companies in Leeds	2
Api and integration platform companies in Watford	2
Api and integration platform companies in Londra	1
Api and integration platform companies in Rugby	1

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 “api and integration platform 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; 1 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 api and integration platform companies are there based in London, United Kingdom?

There are 45 api and integration platform companies headquartered in London, United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

TYK, headquartered in London, tops this list with the largest team on record.

Which city has the most api and integration platform companies?

London leads with 45 headquartered companies, followed by Manchester (4) and Reading (2).

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 385 verified decision-maker contacts tracked across these 45 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.