Company lists · Data refreshed September 2026

Top 25 Legacy system modernization companies based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 738 companies tracked

RevenueBase identified 738 legacy system modernization companies headquartered in London, United Kingdom as of September 2026 and tracks 20,929 professional contacts across them, including 10,203 with verified work emails. London is the largest hub.

This list covers legacy system modernization 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 September 20, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

738Companies

20,929Contacts tracked

10,203Verified emails

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The 25 largest legacy system modernization companies based in London, United Kingdom

Ranked by team size

Top 25 of 738 legacy system modernization companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to legacy system modernization companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Endava	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	10001+	9,653 contacts →
	Indirect evidence “For over two decades, we have been harnessing technology to drive meaningful change.” Source: RevenueBase Database · checked Sep 20, 2026
2	Acuvate	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	545 contacts →
	Indirect evidence “At Acuvate, we empower enterprises to accelerate their Next gen transformation journeys with an AI-First approach.” Source: RevenueBase Database · checked Sep 20, 2026
3	Hitachi Solutions UK	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	422 contacts →
	Indirect evidence “Our team of world-class professionals across the globe work together to innovate and enable sustainable business transformation.” Source: RevenueBase Database · checked Sep 20, 2026
4	Sandhata Technologies	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	363 contacts →
	Partial evidence “We are a global niche consultancy specialising in services that span all facets of Digital transformation, DevOps, and System Integration.” Source: RevenueBase Database · checked Sep 20, 2026
5	Solirius Reply	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	305 contacts →
	Indirect evidence “We are digital transformation specialists, on a mission to make our society an easier and more equitable place for people to live, work and thrive.” Source: RevenueBase Database · checked Sep 20, 2026
6	Total IT Global	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	286 contacts →
	Indirect evidence “At Total IT Global, we elevate your digital journey with cutting-edge innovation, to achieve your vision of ‘the enterprise of the future’.” Source: RevenueBase Database · checked Sep 20, 2026
7	Devtech	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	266 contacts →
	Indirect evidence “Devtech provides outcome-driven digital innovation services and helps companies better respond to change.” Source: RevenueBase Database · checked Sep 20, 2026
8	Cloudreach, An Eviden Business	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	261 contacts →
	Indirect evidence “As of April 2023, Cloudreach is now part of Eviden, an atos business.” Source: RevenueBase Database · checked Sep 20, 2026
9	The Adaptavist Group	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1,001-5,000	254 contacts →
	Indirect evidence “We are experts at delivering innovative software, tailored solutions, and quality services across some of the world's most trusted technology ecosystems, including Atlassian, AWS…” Source: RevenueBase Database · checked Sep 20, 2026
10	Percipere	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	245 contacts →
	Indirect evidence “Percipere is a niche global consultancy, partnering companies in their evolution towards greater operational efficiency and profitability.” Source: RevenueBase Database · checked Sep 20, 2026
11	Tmotions Global Limited	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	228 contacts →
	Indirect evidence “TMotions is inspired by forward-thinking businesses, who are now looking past recovery and shifting into the growth mode.” Source: RevenueBase Database · checked Sep 20, 2026
12	Natilik	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	222 contacts →
	Indirect evidence “Natilik is your technology solutions partner and confident guide to digital transformation, specialising in a range of solutions to help you achieve your goals and drive real…” Source: RevenueBase Database · checked Sep 20, 2026
13	Dreams Technologies, UK & India	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	221 contacts →
	Indirect evidence “At Dreams Technologies, we’re more than software engineers, we’re digital transformation partners.” Source: RevenueBase Database · checked Sep 20, 2026
14	Eappsys	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	193 contacts →
	Partial evidence “eAppSys is a systems integrator that is focused exclusively on supporting the core enterprise application systems within Oracle On-Premise and Cloud Applications.” Source: RevenueBase Database · checked Sep 20, 2026
15	Azurian	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	178 contacts →
	Indirect evidence “The future has never moved this fast.” Source: RevenueBase Database · checked Sep 20, 2026
16	Interex Group	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	160 contacts →
	Indirect evidence “InterEx Group is becoming the strategic partner of choice for organizations undergoing digital, business, and technology transformation.” Source: RevenueBase Database · checked Sep 20, 2026
17	Dogma Group	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	149 contacts →
	Indirect evidence “The Dogma Group is a progressive digital transformation company committed to delivering the digital imperative and becoming the most trusted advisor to its clientele.” Source: RevenueBase Database · checked Sep 20, 2026
18	Daemon	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	145 contacts →
	Indirect evidence “Founded in 2007, Daemon is a technology consultancy with a mission to make the world a better place by creating movements that power digital transformation.” Source: RevenueBase Database · checked Sep 20, 2026
19	Infosight Consulting	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	121 contacts →
	Indirect evidence “At Infosight, we architect the future of enterprises by engineering your digital core and activating the intelligence within.” Source: RevenueBase Database · checked Sep 20, 2026
20	Glue Reply	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	118 contacts →
	Indirect evidence “WHO WE ARE Glue Reply is a business consultancy that strives to help its clients achieve their future potential by developing solutions that often for the first time align IT…” Source: RevenueBase Database · checked Sep 20, 2026
21	Mindpath	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	102 contacts →
	Indirect evidence “Welcome to Mindpath, where innovation meets excellence.” Source: RevenueBase Database · checked Sep 20, 2026
22	Adapt A Datapipe Company	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	98 contacts →
	Indirect evidence “Adapt is a leading UK managed cloud services provider and integrator, enabling customers’ digital evolution.” Source: RevenueBase Database · checked Sep 20, 2026
23	NEO Technology LTD	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	91 contacts →
	Indirect evidence “Organisations are looking at what they need to do to enable growth and efficiency, we show you the ROI and drive the reason to change.” Source: RevenueBase Database · checked Sep 20, 2026
24	Constor Solutions	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	87 contacts →
	Indirect evidence “At Constor Solutions, we believe that technology is the backbone of a successful business.” Source: RevenueBase Database · checked Sep 20, 2026
25	Intuition IT Intuitive Technology Recruitment	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	84 contacts →
	Indirect evidence “IT'S NOT RECRUITMENT.” Source: RevenueBase Database · checked Sep 20, 2026

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: legacy system modernization 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 legacy system modernization companies.
Partial evidence: Its own public description names part of legacy system modernization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name legacy system modernization 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 738 legacy system modernization companies based in London, United Kingdom

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Legacy system modernization companies based in London, United Kingdom at a glance

As of Sep 20, 2026

48.8%Verified-email coverage

28.4Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

338

11-50

252

51-200

105

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 738 companies.

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 legacy system modernization 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 “legacy system modernization 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 legacy system modernization 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 legacy system modernization 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, 10,203 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 September 20, 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.

Legacy system modernization companies by metro in the United Kingdom

Legacy system modernization companies in London738
Legacy system modernization companies in Manchester54
Legacy system modernization companies in Birmingham28
Legacy system modernization companies in Leeds26

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 legacy system modernization 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 legacy system modernization companies are there based in London, United Kingdom?

RevenueBase identified 738 legacy system modernization companies headquartered in London, United Kingdom as of September 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?

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

Which city has the most legacy system modernization companies?

London leads with 738 headquartered companies, followed by Manchester (54) and Birmingham (28).

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 10,203 verified decision-maker contacts tracked across these 738 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 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.