Company lists · Data refreshed September 2026

Top 25 Legacy system modernization firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 34,638 companies tracked

RevenueBase identified 34,638 company matches for legacy system modernization firms worldwide as of September 2026 and tracks 2,478,027 professional contacts across them, including 624,690 with verified work emails. India is the largest market and Hyderabad the largest hub.

This list covers company matches for legacy system modernization 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 September 20, 2026. Country and city lists for legacy system modernization 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 Sep 20, 2026 How this list was built

34,638Companies

2,478,027Contacts tracked

624,690Verified emails

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The 25 largest legacy system modernization firms worldwide

Ranked by team size

Top 25 of 34,638 company matches for legacy system modernization firms worldwide, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Tata Consultancy Services	Exact match	Mumbai, IndiaHQ recorded Sep 20, 2026	10001+	634,047 contacts →
	Exact match “Tata Consultancy Services (TCS) is the technology partner of choice for industry leading organizations worldwide.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2	Infosys	Exact match	Bangalore, IndiaHQ recorded Sep 20, 2026	10001+	323,099 contacts →
	Exact match “Infosys is a global leader in next-generation digital services and consulting.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3	DXC Technology	Exact match	Ashburn, VA, United StatesHQ recorded Sep 20, 2026	10001+	82,768 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 · Sep 20, 2026 · View company records in RevenueBase
4	Accenture In India	Exact match	Bengaluru, IndiaHQ recorded Sep 20, 2026	10001+	74,008 contacts →
	Exact match “Accenture is a global professional services company with leading capabilities in digital, cloud and security.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5	Mphasis	Exact match	Bangalore, IndiaHQ recorded Sep 20, 2026	10001+	43,484 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 · Sep 20, 2026 · View company records in RevenueBase
6	NTT Data	Exact match	Tokyo, JapanHQ recorded Sep 20, 2026	10001+	38,436 contacts →
	Exact match “NTT DATA – a part of NTT Group – IT and business services headquartered in Tokyo.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7	Telus Digital	Exact match	Vancouver, BC, CanadaHQ recorded Sep 20, 2026	10001+	38,300 contacts →
	Exact match “TELUS Digital crafts unique and enduring experiences for customers and employees, and creates future-focused digital transformations that stand the test of time.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8	Sopra Steria	Exact match	Paris, FranceHQ recorded Sep 20, 2026	10001+	36,960 contacts →
	Exact match “Sopra Steria, a major Tech player in Europe with employees in nearly 30 countries, is recognised for its consulting, digital services and solutions.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	UST	Exact match	Aliso Viejo, CA, United StatesHQ recorded Sep 20, 2026	10001+	34,875 contacts →
	Exact match “UST is a global digital transformation solutions provider.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10	Persistent Systems	Exact match	Pune, IndiaHQ recorded Sep 20, 2026	10001+	27,154 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 · Sep 20, 2026 · View company records in RevenueBase
11	Teksystems	Exact match	Hanover, MD, United StatesHQ recorded Sep 20, 2026	10001+	24,693 contacts →
	Exact match “We’re TEKsystems and TEKsystems Global Services.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12	LTI	Exact match	Mumbai, IndiaHQ recorded Sep 20, 2026	10001+	21,036 contacts →
	Exact match “LTI is now LTIMindtree, and we are getting businesses to the future, faster.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	Nagarro	Exact match	Munich, GermanyHQ recorded Sep 20, 2026	10001+	18,676 contacts →
	Exact match “Nagarro helps future-proof your business through a forward-thinking, fluidic, and CARING mindset.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14	Birlasoft	Exact match	Pune, IndiaHQ recorded Sep 20, 2026	10001+	13,983 contacts →
	Exact match “Navigating Change.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	Insight	Exact match	Chandler, AZ, United StatesHQ recorded Sep 20, 2026	10001+	12,899 contacts →
	Exact match “Insight Enterprises, Inc.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	Luxoft	Exact match	Zug, SwitzerlandHQ recorded Sep 20, 2026	10001+	11,471 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 · Sep 20, 2026 · View company records in RevenueBase
17	T-Systems International	Exact match	Frankfurt Am Main, GermanyHQ recorded Sep 20, 2026	10001+	10,154 contacts →
	Exact match “Your digitalization partner with industry expertise With locations in more than 26 countries and over employees (2024), T-Systems is one of the leading providers of digital…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18	Endava	Exact match	London, United KingdomHQ recorded Sep 20, 2026	10001+	9,653 contacts →
	Exact match “For over two decades, we have been harnessing technology to drive meaningful change.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19	Cybage Software	Exact match	Pune, IndiaHQ recorded Sep 20, 2026	5,001-10,000	8,806 contacts →
	Exact match “Cybage is an information technology company specializing in outsourced product engineering and IT consulting services.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	Conneqt Business Solutions	Exact match	Bangalore, IndiaHQ recorded Sep 20, 2026	10001+	7,980 contacts →
	Exact match “Conneqt Business Solutions, now Digitide Solutions Ltd, was established in 2004.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	Systems Limited	Exact match	Lahore, PakistanHQ recorded Sep 20, 2026	5,001-10,000	7,672 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 · Sep 20, 2026 · View company records in RevenueBase
22	Sonata Software	Exact match	Bangalore, IndiaHQ recorded Sep 20, 2026	5,001-10,000	7,508 contacts →
	Exact match “Sonata Software Limited is a leading Modernization engineering company, headquartered in Bangalore.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23	R Systems	Exact match	El Dorado Hills, CA, United StatesHQ recorded Sep 20, 2026	5,001-10,000	7,360 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 · Sep 20, 2026 · View company records in RevenueBase
24	Netcompany	Exact match	Copenhagen, DenmarkHQ recorded Sep 20, 2026	5,001-10,000	6,240 contacts →
	Exact match “Netcompany is the fastest growing and most successful IT service company in Northern Europe.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25	Wavestone	Exact match	100-101 Terrasse Boieldieu, FranceHQ recorded Sep 20, 2026	1,001-5,000	6,190 contacts →
	Exact match “Wavestone is a leading consulting firm operating at the intersection of business and technology.” Recorded in the RevenueBase company graph · Sep 20, 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 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 34,638 legacy system modernization firms worldwide

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Legacy system modernization firms worldwide at a glance

As of Sep 20, 2026

25.2%Verified-email coverage

71.5Average contacts per company

11-50Median size (employees)

1.6%Largest-city concentration · Hyderabad

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

15,107

11-50

12,330

51-200

4,882

201-500

1,219

501-1,000

468

1,001-5,000

374

5,001-10,000

10001+

148

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 firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “legacy system modernization 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 624,690 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.

Legacy system modernization firms by location

193 lists · largest first

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

How many legacy system modernization firms are there worldwide?

RevenueBase identified 34,638 company matches for legacy system modernization firms worldwide 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?

Tata Consultancy Services 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 firms?

India leads with 6,318 companies, followed by the United States (5,213) and Germany (1,320). Every legacy system modernization firms list by country and city is linked on this page.

Which city has the most legacy system modernization firms?

Hyderabad leads with 570 company records, followed by London (561) and Pune (510).

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 624,690 professional contacts with verified work emails tracked across these 34,638 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.