Company lists · Data refreshed November 2026

Top 25 Legacy system modernization consultancies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Nov 5, 2026 35,226 companies tracked

RevenueBase identified 35,226 company matches for legacy system modernization consultancies worldwide as of November 2026 and tracks 1,645,389 professional contacts across them, including 430,875 with verified work emails. The United States is the largest market and Hyderabad the largest hub.

This list covers company matches for legacy system modernization consultancies 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 5, 2026. Country and city lists for legacy system modernization consultancies 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 5, 2026 How this list was built

35,226Companies

1,645,389Contacts tracked

430,875Verified emails

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The 25 largest legacy system modernization consultancies worldwide

Ranked by team size

Top 25 of 35,226 company matches for legacy system modernization consultancies worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 5, 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	Tech Mahindra	Exact match	Pune, IndiaHQ recorded Nov 5, 2026	10001+	145,360 contacts →
	Exact match “Tech Mahindra offers technology consulting and digital solutions to global enterprises across industries, enabling transformative scale at unparalleled speed.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2	DXC Technology	Exact match	Ashburn, VA, United StatesHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
3	Accenture In India	Exact match	Bangalore, IndiaHQ recorded Nov 5, 2026	10001+	78,030 contacts →
	Exact match “Accenture is a global professional services company with leading capabilities in digital, cloud and security.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4	Mphasis	Exact match	Bangalore, IndiaHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
5	NTT Data	Exact match	Tokyo, JapanHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
6	Persistent Systems	Exact match	Pune, IndiaHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
7	Teksystems	Exact match	Hanover, MD, United StatesHQ recorded Nov 5, 2026	10001+	27,308 contacts →
	Exact match “We’re TEKsystems and TEKsystems Global Services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8	NTT Data, INC	Exact match	Tokyo, JapanHQ recorded Nov 5, 2026	10001+	21,602 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9	LTI	Exact match	Mumbai, IndiaHQ recorded Nov 5, 2026	10001+	20,247 contacts →
	Exact match “LTI is now LTIMindtree, and we are getting businesses to the future, faster.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10	Insight	Exact match	Chandler, United StatesHQ recorded Nov 5, 2026	10001+	14,497 contacts →
	Exact match “Insight Enterprises, Inc.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11	Softtek	Exact match	Monterrey, MexicoHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
12	CDW	Exact match	Vernon Hills, IL, United StatesHQ recorded Nov 5, 2026	10001+	13,669 contacts →
	Exact match “At CDW, we know how to make technology work so people can do great things.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13	Luxoft	Exact match	Zug, MI, SwitzerlandHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
14	Sogeti	Exact match	Paris, United StatesHQ recorded Nov 5, 2026	10001+	10,041 contacts →
	Exact match “Part of the Capgemini Group, Sogeti makes technology simple and impactful.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15	Endava	Exact match	London, United KingdomHQ recorded Nov 5, 2026	10001+	10,037 contacts →
	Exact match “For over two decades, we have been harnessing technology to drive meaningful change.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16	World Wide Technology	Exact match	Maryland Heights, MO, United StatesHQ recorded Nov 5, 2026	10001+	9,996 contacts →
	Exact match “We are thinkers and doers.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17	Systems Limited	Exact match	Lahore, PakistanHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
18	Experis	Exact match	Milwaukee, United StatesHQ recorded Nov 5, 2026	10001+	8,373 contacts →
	Exact match “Experis® is a global leader in technology services, helping organizations shorten the distance between innovation and business impact in a digital world.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19	R Systems	Exact match	El Dorado Hills, United StatesHQ recorded Nov 5, 2026	5,001-10,000	7,893 contacts →
	Exact match “RSI is a trusted software engineering and digital transformation services partner to global enterprises navigating technological change.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20	Sonata Software	Exact match	Bangalore, IndiaHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
21	SHI International Corp	Exact match	Somerset, United StatesHQ recorded Nov 5, 2026	5,001-10,000	7,151 contacts →
	Exact match “Think of SHI as your personal technology concierge.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22	Datacom	Exact match	Auckland, New ZealandHQ recorded Nov 5, 2026	5,001-10,000	6,268 contacts →
	Exact match “Datacom is a technology partner and solutions provider combining deep local expertise with global capability, working across data, cloud, cyber security, digital engineering and…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23	SII Poland	Exact match	Warsaw, PolandHQ recorded Nov 5, 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 5, 2026 · View company records in RevenueBase
24	Groupe SII	Exact match	Paris, FranceHQ recorded Nov 5, 2026	10001+	5,212 contacts →
	Exact match “Le groupe SII est une société d’ingénierie et de conseil en technologies (ICT) et une entreprise de services numériques (ESN) créée en 1979 par Bernard HUVÉ, ingénieur de…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
25	Clover Infotech	Exact match	Mumbai, IndiaHQ recorded Nov 5, 2026	5,001-10,000	5,111 contacts →
	Exact match “Clover Infotech is a global IT services and consulting company founded in 1994 and headquartered in Mumbai, India.” Recorded in the RevenueBase company graph · Nov 5, 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 modernization consultancies”. 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 35,226 legacy system modernization consultancies worldwide

See the full list, filter by size, metro and specialty, and access 430,875 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Legacy system modernization consultancies worldwide at a glance

As of Nov 5, 2026

26.2%Verified-email coverage

46.7Average contacts per company

11-50Median size (employees)

1.9%Largest-city concentration · Hyderabad

Nov 5, 2026Page data refreshed

Companies by employee count

1-10

15,539

11-50

12,405

51-200

4,912

201-500

1,259

501-1,000

452

1,001-5,000

330

5,001-10,000

10001+

127

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 modernization consultancies are linked below.
What qualifies: Company records worldwide whose business descriptions match “legacy system modernization consultancies” 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 430,875 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 5, 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 modernization consultancies by location

224 lists · largest first

Every Legacy system modernization consultancies 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 modernization consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many legacy system modernization consultancies are there worldwide?

RevenueBase identified 35,226 company matches for legacy system modernization consultancies 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?

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

Which country has the most legacy system modernization consultancies?

The United States leads with 7,304 companies, followed by India (6,056) and the United Kingdom (1,565). Every legacy system modernization consultancies list by country and city is linked on this page.

Which city has the most legacy system modernization consultancies?

Hyderabad leads with 686 company records, followed by London (634) and Bangalore (631).

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 430,875 professional contacts with verified work emails tracked across these 35,226 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 5, 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.