Company lists · Data refreshed November 2026

Top 21 Legacy system migration services based in Chicago, United States

Name: Legacy system migration services based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 78 companies tracked

RevenueBase identified 78 company matches for legacy system migration services associated with Chicago, United States as of November 2026 and tracks 5,647 professional contacts across them, including 2,904 with verified work emails. Across the United States, New York is the largest hub for this category (142 companies); Chicago has 78.

This list covers company matches for legacy system migration services associated with Chicago, 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 November 6, 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 Nov 6, 2026 How this list was built

78Companies

5,647Contacts tracked

2,904Verified emails

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The 21 largest legacy system migration services based in Chicago, United States

Ranked by team size

Top 21 of 78 company matches for legacy system migration services based in Chicago, United States, 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	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
2	Celsior	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	286 contacts →
	Exact match “Celsior provides innovative, outcome-based technology solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	RKON	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	51-200	164 contacts →
	Exact match “Since 1998, RKON has delivered IT Transformation helping private equity and enterprise firms achieve Quiet IT from vision to execution.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Aberdeen Advisors LLC	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	51-200	95 contacts →
	Exact match “Headquartered in Chicago, with satellite offices in India and Mexico, Aberdeen Advisors LLC is a boutique digital consultancy providing innovative products and services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Soliant Consulting	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	51-200	80 contacts →
	Exact match “At Soliant, we build custom software solutions that break down growth barriers and open doors to new opportunities.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	10th Magnitude NOW Cognizant Microsoft Business Group	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	51-200	76 contacts →
	Exact match “10th Magnitude helps businesses transform with innovative, cloud-based solutions that harness the power of Microsoft Azure.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Logicon, LLC	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	51-200	56 contacts →
	Exact match “At Logicon, we help businesses streamline operations, reduce manual work, and make technology effortless.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Triangu	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	11-50	55 contacts →
	Exact match “Triangu delivers end-to-end digital transformation for enterprises that need results, not just recommendations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	US Software Professionals INC	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	11-50	35 contacts →
	Exact match “USSP (US Software Professionals Inc) is a best in class IT consulting firm offering end to end service and implementation solutions to clients worldwide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Revel Labs	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	11-50	34 contacts →
	Exact match “Revel Labs was founded from a legacy of leading Fortune 500 companies through technology fueled transformation, from ecommerce to cloud enablement to AI.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Manifold	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	51-200	29 contacts →
	Exact match “Manifold is a dynamic consultancy and technology partner helping organizations across industries unlock innovation, drive digital transformation, and achieve sustainable growth.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Zivra, LLC	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	11-50	22 contacts →
	Exact match “Zivra is a boutique IT professional services firm founded by highly-experienced IT consulting executives.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Pearl Consulting Group	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	11-50	15 contacts →
	Exact match “Pearl Consulting Group is a global IT consulting firm dedicated to helping businesses navigate the complexities of technology with confidence.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Mdrn Tech	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	11-50	14 contacts →
	Exact match “At MDRN Tech, we dare to dream big, push boundaries and deliver a more modern way.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Next Dynamics	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	11-50	13 contacts →
	Exact match “Next Dynamics is a management consulting and technology solutions firm focused on helping organizations navigate and execute meaningful digital transformation.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Programmers US	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	201-500	12 contacts →
	Exact match “A proven software development partner, Programmers Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Prime TSR	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	51-200	10 contacts →
	Exact match “Prime TSR is a technology modernization consultancy.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Alidade Strategy & Communications, INC	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	1-10	8 contacts →
	Exact match “The Alidade Strategy & Communications team specializes in guiding global enterprises through technology and organizational transformation.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Amtech Analytics LLC	Exact match	Chicago, United StatesHQ recorded Nov 6, 2026	51-200	8 contacts →
	Exact match “Amtech Analytics: Empowering Innovation through IT Consulting: Founded in 2023 by Kumarasenthil Muthuvel.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Work AS A Service	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	11-50	5 contacts →
	Exact match “We Make You Efficient and Cost Effective We are technology and Cloud transformation specialists that take a holistic approach to transform your business to be more efficient and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Yayo Interactive	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	1-10	5 contacts →
	Exact match “Yayo Interactive is a technology and digital solutions firm helping organizations modernize systems, strengthen security, and improve business performance through scalable…” 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 migration services”. 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 21 of 78 legacy system migration services based in Chicago, United States

See the full list, filter by size, metro and specialty, and access 2,904 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Legacy system migration services based in Chicago, United States at a glance

As of Nov 6, 2026

51.4%Verified-email coverage

72.4Average contacts per company

11-50Median size (employees)

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Chicago, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 78 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 Chicago, United States whose business descriptions match “legacy system migration services” 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 2,904 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 migration services by metro in the United States

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

How many legacy system migration services are there based in Chicago, United States?

RevenueBase identified 78 company matches for legacy system migration services associated with Chicago, United States 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?

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

Which city in the United States has the most legacy system migration services?

New York leads the United States with 142 company records, followed by Dallas (99) and Austin (97). Chicago has 78.

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 2,904 professional contacts with verified work emails tracked across these 78 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.