Company lists · Data refreshed September 2026

Top 25 Legacy system modernization firms based in the United States

Name: Legacy system modernization firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 5,213 companies tracked

RevenueBase identified 5,213 company matches for legacy system modernization firms associated with the United States as of September 2026 and tracks 461,488 professional contacts across them, including 124,276 with verified work emails. New York is the largest hub.

This list covers company matches for legacy system modernization firms associated with the United States, 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

5,213Companies

461,488Contacts tracked

124,276Verified emails

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The 25 largest legacy system modernization firms based in the United States

Ranked by team size

Top 25 of 5,213 company matches for legacy system modernization firms based in the United States, 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	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
2	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
3	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
4	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
5	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
6	Innova Solutions	Exact match	Atlanta, GA, United StatesHQ recorded Sep 20, 2026	10001+	4,799 contacts →
	Exact match “Innova Solutions is a global technology and talent partner specializing in transformative digital solutions.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7	Presidio	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	1,001-5,000	3,798 contacts →
	Exact match “At Presidio, speed and quality meet technology and innovation.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8	CES	Exact match	Bolingbrook, IL, United StatesHQ recorded Sep 20, 2026	1,001-5,000	3,502 contacts →
	Exact match “CES is a trusted global provider of Technology and Business Process Modernization (BPM) services, serving enterprise clients for over three decades.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	Ensono	Exact match	Downers Grove, IL, United StatesHQ recorded Sep 20, 2026	1,001-5,000	3,247 contacts →
	Exact match “Ensono is an expert technology adviser and managed service provider.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10	Visionet Systems INC	Exact match	Cranbury, NJ, United StatesHQ recorded Sep 20, 2026	10001+	3,119 contacts →
	Exact match “Visionet is a premier digital technology solutions company built on the premise of disruptive innovation.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11	AHEAD	Exact match	Chicago, IL, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,989 contacts →
	Exact match “AHEAD accelerates strategy into execution by engineering integrated solutions across infrastructure, applications, data, and security.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12	Rocket Software	Exact match	Waltham, MA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,703 contacts →
	Exact match “As a global technology leader, Rocket Software is the partner of choice for organizations transforming their IT from core systems to the cloud.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	Speridian Technologies	Exact match	Albuquerque, NM, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,619 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 · Sep 20, 2026 · View company records in RevenueBase
14	People Tech Group INC	Exact match	Redmond, WA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,434 contacts →
	Exact match “People Tech Group is a leading Enterprise Solutions, Digital Transformation, Data Intelligence, and Modern Operation services provider.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	Accion Labs	Exact match	Bridgeville, PA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,417 contacts →
	Exact match “Accion Labs is an - headquartered in Pittsburgh.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	Trianz	Exact match	Herndon, VA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,331 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 · Sep 20, 2026 · View company records in RevenueBase
17	IDC Technologies, INC	Exact match	Milpitas, CA, United StatesHQ recorded Sep 20, 2026	5,001-10,000	2,269 contacts →
	Exact match “We are IDC Technologies - where people and digital innovation come together to create measurable impact.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18	CTG	Exact match	Amherst, NY, United StatesHQ recorded Sep 20, 2026	5,001-10,000	2,264 contacts →
	Exact match “CTG, a Cegeka company, is at the forefront of digital transformation, offering innovative IT solutions and services that accelerate your strategy and project momentum.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19	CBTS	Exact match	Cincinnati, OH, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,211 contacts →
	Exact match “CBTS serves enterprise and midmarket clients in all industries across North America.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	Techwave	Exact match	Houston, TX, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,140 contacts →
	Exact match “Techwave is a leading global IT and engineering services and solutions company revolutionizing digital transformation.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	Thoughtfocus	Exact match	Mckinney, TX, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,097 contacts →
	Exact match “ThoughtFocus, headquartered in the U.S.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22	Marlabs	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,000 contacts →
	Exact match “Marlabs is your trusted AI transformation partner with 30 years of experience solving modern challenges, with a proven track record of delivering complex technology solutions to…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23	Nous Infosystems	Exact match	Edison, NJ, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,926 contacts →
	Exact match “Nous Infosystems is now.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24	Quinnox	Exact match	Chicago, IL, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,917 contacts →
	Exact match “Everforth Quinnox is an AI-first Digital Always organization orchestrating value for forward-looking businesses.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25	Jade Global	Exact match	San Jose, CA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,872 contacts →
	Exact match “Jade Global is a premier consulting, integration, and managed services partner helping enterprises modernize, innovate, and scale.” 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 5,213 legacy system modernization firms based in the United States

See the full list, filter by size, metro and specialty, and access 124,276 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Legacy system modernization firms based in the United States at a glance

As of Sep 20, 2026

26.9%Verified-email coverage

88.5Average contacts per company

11-50Median size (employees)

3.6%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

1,755

11-50

1,730

51-200

1,110

201-500

311

501-1,000

137

1,001-5,000

115

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 5,213 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 States 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. 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 124,276 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 metro

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 based in the United States?

RevenueBase identified 5,213 company matches for legacy system modernization firms associated with the United States 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?

DXC Technology 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 firms?

New York leads with 189 company records, followed by Austin (150) and Houston (135).

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 124,276 professional contacts with verified work emails tracked across these 5,213 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.