Company lists · Data refreshed September 2026

Top 25 Legacy system modernization consultants based in the United Kingdom

RevenueBase identified 1,038 company matches for legacy system modernization consultants associated with the United Kingdom as of September 2026 and tracks 22,582 professional contacts across them, including 2,247 with verified work emails. London is the largest hub.

This list covers company matches for legacy system modernization consultants associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 20, 2026 How this list was built
1,038Companies
22,582Contacts tracked
2,247Verified emails
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The 25 largest legacy system modernization consultants based in the United Kingdom

Ranked by team size
Top 25 of 1,038 company matches for legacy system modernization consultants based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchDerby, United KingdomHQ recorded Sep 20, 20261,001-5,000628 contacts →

Exact match

“Node4 helps businesses achieve more with secure, AI‑powered cloud and managed service platforms.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2Exact matchWest End, United KingdomHQ recorded Sep 20, 2026201-500326 contacts →

Exact match

“As our name suggests, our customers rely on us in providing suitable technology inputs to support their business goals.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3Exact matchDurham, United KingdomHQ recorded Sep 20, 2026201-500215 contacts →

Exact match

“We are an IT business with a difference.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4Exact matchLondon, United KingdomHQ recorded Sep 20, 2026201-500121 contacts →

Exact match

“At Infosight, we architect the future of enterprises by engineering your digital core and activating the intelligence within.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5Exact matchMaidenhead, United KingdomHQ recorded Sep 20, 202651-20097 contacts →

Exact match

“NeosAlpha: Your Trusted Partner in IT Consulting and Digital Transformation Founded in the UK in 2017, NeosAlpha is a niche IT consulting and services company, that delivers…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6Exact matchLondon, United KingdomHQ recorded Sep 20, 20261,001-5,00078 contacts →

Exact match

“We offer a broad portfolio of IT and consulting services covering Governance and Strategy, Cloud, Data, Cybersecurity, Infrastructure and Applications, Managed IT and Security.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7Exact matchReading, United KingdomHQ recorded Sep 20, 202611-5075 contacts →

Exact match

“Headquartered at Reading, Berkshire in United Kingdom, Bit Wave Solutions enables global businesses to build their future by directing clients’ innovation & customization agenda.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8Exact matchSolihull, United KingdomHQ recorded Sep 20, 202651-20066 contacts →

Exact match

“Intelex Systems is a leading technology consulting, IT services and Right sourcing solutions company, delivering technology driven business solutions that meet strategic…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9Exact matchLiverpool Street, United KingdomHQ recorded Sep 20, 202651-20060 contacts →

Exact match

“Wavex offers a fresh approach to improving and modernising managed services.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10Exact matchRichmond, United KingdomHQ recorded Sep 20, 202651-20056 contacts →

Exact match

“At Estafet, we don’t just optimize processes - we revolutionize how enterprises operate.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11Exact matchLondon, United KingdomHQ recorded Sep 20, 202651-20054 contacts →

Exact match

“CloudPlexo is a global technology consulting firm helping organizations transform, innovate, and build resilience through Cloud, AI, and Cybersecurity.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12Exact matchDartford, United KingdomHQ recorded Sep 20, 2026201-50053 contacts →

Exact match

“At GSC Technologies, we are architects of digital transformation, empowering businesses with innovative IT solutions that drive growth and efficiency.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13Exact matchLondon, United KingdomHQ recorded Sep 20, 202651-20052 contacts →

Exact match

“Diegesis is a business technology and IT systems integration company that specialises in Decision Support Solutions.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14Exact matchCardiff, United KingdomHQ recorded Sep 20, 202651-20051 contacts →

Exact match

“Experts in digital transformation, we work closely with you to plan, prepare, and implement integrated technologies to revolutionise the way you work.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15Exact matchDaresbury, United KingdomHQ recorded Sep 20, 2026201-50050 contacts →

Exact match

“Eclature Technologies stands for engineering innovation, excellence, and reliability.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16Exact matchUxbridge, United KingdomHQ recorded Sep 20, 202651-20049 contacts →

Exact match

“S P A has been coined as our company name and the acronym which articulates three vital areas of an enterprise - Systems, Processes and Applications – which requires being robust…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17Exact matchSuite 14-7, United KingdomHQ recorded Sep 20, 202651-20049 contacts →

Exact match

“UXLI is a UK-based data and AI consultancy with over a decade of experience helping organisations unlock value from their data.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18Exact matchLondon, United KingdomHQ recorded Sep 20, 202611-5048 contacts →

Exact match

“Global Vibe Technologies Ltd Empowering Growth Through Strategic IT Solutions.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19Exact matchLondon, United KingdomHQ recorded Sep 20, 202651-20047 contacts →

Exact match

“Pace Integration is a unique technology consultancy that solves your integration challenge – focused on enterprise systems integration strategy, architecture and design that is…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20Exact matchErith, United KingdomHQ recorded Sep 20, 202611-5047 contacts →

Exact match

“It’s all about making a difference The world of IT is an ever-evolving industry with new developments in technology emerging constantly.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21Exact matchManchester, United KingdomHQ recorded Sep 20, 202651-20045 contacts →

Exact match

“Wait, can we actually do that?" is our favourite thing to hear.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22Exact matchBurnley, United KingdomHQ recorded Sep 20, 202611-5039 contacts →

Exact match

“At Holker IT our aim is to improve our clients’ businesses through strategic advice, implementation and on-going support of IT systems and processes, from single to multi-server…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23Exact matchLondon, United KingdomHQ recorded Sep 20, 2026201-50038 contacts →

Exact match

“Somo is now CI & T.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24Exact matchLondon, United KingdomHQ recorded Sep 20, 202651-20035 contacts →

Exact match

“HP Infosystem is a comprehensive consulting and IT Services provider of absolute tech-business solutions having strong expertise and extensive technical skills with global…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25Exact matchFleet, United KingdomHQ recorded Sep 20, 202611-5034 contacts →

Exact match

“When IT feels hard work, frustrating, or unreliable, it slows everything down.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase

Showing 25 of 1,038 legacy system modernization consultants based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 2,247 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Legacy system modernization consultants based in the United Kingdom at a glance

As of Sep 20, 2026
10.0%Verified-email coverage
21.8Average contacts per company
1-10Median size (employees)
35.5%Largest-city concentration · London
Sep 20, 2026Page data refreshed

Companies by employee count

1-10
709
11-50
236
51-200
69
201-500
13
501-1,000
3
1,001-5,000
3
5,001-10,000
1
10001+
2

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 1,038 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with the United Kingdom whose business descriptions match “legacy system modernization consultants” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 2,247 professional contacts with verified work emails across the full matched dataset. 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.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “legacy system modernization consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many legacy system modernization consultants are there based in the United Kingdom?

RevenueBase identified 1,038 company matches for legacy system modernization consultants associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Node4 tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most legacy system modernization consultants?

London leads with 369 company records, followed by Manchester (27) and Bristol (17).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 2,247 professional contacts with verified work emails tracked across these 1,038 companies; direct dials are available where recorded.

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 SmartSearch, 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.