Company lists · Data refreshed November 2026

Top 25 Legacy system integration firms worldwide

Name: Legacy system integration firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 15,893 companies tracked

RevenueBase identified 15,893 company matches for legacy system integration firms worldwide as of November 2026 and tracks 749,862 professional contacts across them, including 211,486 with verified work emails. The United States is the largest market and Hyderabad the largest hub.

This list covers company matches for legacy system integration firms worldwide, 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 November 6, 2026. Country and city lists for legacy system integration firms follow the table.

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 Nov 6, 2026 How this list was built

15,893Companies

749,862Contacts tracked

211,486Verified emails

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The 25 largest legacy system integration firms worldwide

Ranked by team size

Top 25 of 15,893 company matches for legacy system integration firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	DXC Technology	Exact match	Ashburn, VA, United StatesHQ recorded Nov 6, 2026	10001+	86,844 contacts →
	Exact match “DXC Technology helps global companies run their mission-critical systems and operations while modernizing IT, optimizing data architectures, and ensuring security and scalability…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Mphasis	Exact match	Bangalore, IndiaHQ recorded Nov 6, 2026	10001+	46,102 contacts →
	Exact match “A leading applied technology services company, we innovate to deliver service excellence and successful outcomes across sales, delivery and development.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	NTT Data	Exact match	Tokyo, JapanHQ recorded Nov 6, 2026	10001+	42,145 contacts →
	Exact match “NTT DATA – a part of NTT Group – IT and business services headquartered in Tokyo.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Persistent Systems	Exact match	Pune, IndiaHQ recorded Nov 6, 2026	10001+	29,855 contacts →
	Exact match “We are an AI-led, platform-driven Digital Engineering and Enterprise Modernization partner, combining deep technical expertise and industry experience to help our clients…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Insight	Exact match	Chandler, United StatesHQ recorded Nov 6, 2026	10001+	14,497 contacts →
	Exact match “Insight Enterprises, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Softtek	Exact match	Monterrey, MexicoHQ recorded Nov 6, 2026	10001+	14,096 contacts →
	Exact match “At Softtek, we drive the strategic development of our clients through software engineering.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Luxoft	Exact match	Zug, MI, SwitzerlandHQ recorded Nov 6, 2026	10001+	11,771 contacts →
	Exact match “Luxoft, a DXC Technology Company (NYSE: DXC), is a digital strategy and software engineering firm providing bespoke technology solutions that drive business change for customers…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Systems Limited	Exact match	Lahore, PakistanHQ recorded Nov 6, 2026	5,001-10,000	8,539 contacts →
	Exact match “Systems Limited is a globally recognized IT software solution company offering state-of-the-art professional services and BPO offerings in the technology landscape.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Sonata Software	Exact match	Bangalore, IndiaHQ recorded Nov 6, 2026	5,001-10,000	7,815 contacts →
	Exact match “Sonata Software Limited is a leading Modernization engineering company, headquartered in Bangalore.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Tyler Technologies	Exact match	Plano, IL, United StatesHQ recorded Nov 6, 2026	5,001-10,000	7,246 contacts →
	Exact match “Tyler Technologies (NYSE: TYL) provides integrated software and technology services to the public sector.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	SII Poland	Exact match	Warsaw, PolandHQ recorded Nov 6, 2026	5,001-10,000	5,657 contacts →
	Exact match “With over 7 500 Power People, Sii is Poland’s #1 partner for technology consulting, AI-driven digital transformation, engineering, and business services, empowering companies to…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Ness Digital Engineering	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	1,001-5,000	5,488 contacts →
	Exact match “Ness Digital Engineering is a global provider of Intelligent Data and Software Engineering services, specializing in data, AI, and cloud-powered solutions that drive innovation…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Team Computers	Exact match	New Delhi, IndiaHQ recorded Nov 6, 2026	1,001-5,000	4,945 contacts →
	Exact match “Our story began in 1987, when our founder, Ranjan Chopra, an alumnus of IIT Kanpur, set out to bridge the gap between business needs and IT solutions in India.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Automated Systems H.K. Limited	Exact match	Shatin, Hong KongHQ recorded Nov 6, 2026	1,001-5,000	4,273 contacts →
	Exact match “Established in 1973, ASL (HKEX: 771) accelerates the success of leading organizations by building a bridge connecting innovative technology to the business environment.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Software AG	Exact match	Darmstadt, GermanyHQ recorded Nov 6, 2026	n/a	4,213 contacts →
	Exact match “Software AG has been helping enterprises run and evolve their core business applications for over 50 years.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Andersen LAB	Exact match	Warsaw, PolandHQ recorded Nov 6, 2026	1,001-5,000	3,766 contacts →
	Exact match “Andersen – your global software development partner Andersen is a global software development company with over 18 years of experience supporting businesses worldwide in their…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Ensono	Exact match	Downers Grove, IL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	3,542 contacts →
	Exact match “Ensono is an expert technology adviser and managed service provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	AHEAD	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	3,490 contacts →
	Exact match “AHEAD accelerates strategy into execution by engineering integrated solutions across infrastructure, applications, data, and security.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Quest Software	Exact match	Austin, TX, United StatesHQ recorded Nov 6, 2026	1,001-5,000	3,432 contacts →
	Exact match “At Quest Software, we help organizations build modern, trusted foundations for AI.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Hitachi Digital Services	Exact match	Santa Clara, United StatesHQ recorded Nov 6, 2026	5,001-10,000	3,232 contacts →
	Exact match “Hitachi Digital Services, a wholly owned subsidiary of Hitachi, Ltd, is a global systems integrator powering mission-critical platforms with people and technology.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	EJADA	Exact match	Riyadh, Saudi ArabiaHQ recorded Nov 6, 2026	1,001-5,000	3,176 contacts →
	Exact match “ejada is a leading technology solutions provider in the Middle East and North Africa (MENA) region, headquartered in Saudi Arabia since 2005.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Mitra Integrasi Informatika, PT	Exact match	Jakarta, IndonesiaHQ recorded Nov 6, 2026	1,001-5,000	2,734 contacts →
	Exact match “Mitra Integrasi Informatika (“MII”), established in 1996 as a subsidiary of the publicly listed PT Metrodata Electronics, Tbk.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Allied Digital	Exact match	Mumbai, IndiaHQ recorded Nov 6, 2026	1,001-5,000	2,730 contacts →
	Exact match “Allied Digital Services is a globally recognized leader in Digital Transformation and a Master Systems Integrator, with over four decades of proven experience.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Speridian Technologies	Exact match	Albuquerque, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,668 contacts →
	Exact match “Speridian Technologies is a global consulting and technology services firm that helps enterprises and public sector organizations modernize operations, enhance customer experience…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Trianz	Exact match	Herndon, VA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,385 contacts →
	Exact match “Trianz is a "transformation services as a software" company - helping enterprises accelerate cloud adoption and AI transformation through Concierto, our unified, AI-first platform…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “legacy system integration firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 15,893 legacy system integration firms worldwide

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Legacy system integration firms worldwide at a glance

As of Nov 6, 2026

28.2%Verified-email coverage

47.2Average contacts per company

11-50Median size (employees)

1.7%Largest-city concentration · Hyderabad

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

6,579

11-50

5,849

51-200

2,312

201-500

621

501-1,000

212

1,001-5,000

170

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for legacy system integration firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “legacy system integration firms” 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. 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 211,486 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 November 6, 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.

Legacy system integration firms by location

121 lists · largest first

Every Legacy system integration firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 integration firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many legacy system integration firms are there worldwide?

RevenueBase identified 15,893 company matches for legacy system integration firms worldwide as of November 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?

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

Which country has the most legacy system integration firms?

The United States leads with 3,370 companies, followed by India (2,214) and the United Kingdom (549). Every legacy system integration firms list by country and city is linked on this page.

Which city has the most legacy system integration firms?

Hyderabad leads with 269 company records, followed by Bangalore (229) and London (184).

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 211,486 professional contacts with verified work emails tracked across these 15,893 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 November 6, 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.