Company lists · Data refreshed September 2026

Top 25 Legacy system modernization companies based in Chicago, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 102 companies tracked

RevenueBase identified 102 legacy system modernization companies headquartered in Chicago, United States as of September 2026 and tracks 6,888 professional contacts across them, including 3,429 with verified work emails. New York is the largest hub.

This list covers legacy system modernization companies headquartered in Chicago, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

102Companies

6,888Contacts tracked

3,429Verified emails

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The 25 largest legacy system modernization companies based in Chicago, United States

Ranked by team size

Top 25 of 102 legacy system modernization companies based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to legacy system modernization companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	AHEAD	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,989 contacts →
	Indirect evidence “AHEAD accelerates strategy into execution by engineering integrated solutions across infrastructure, applications, data, and security.” Source: RevenueBase Database · checked Sep 20, 2026
2	Quinnox	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,917 contacts →
	Indirect evidence “Everforth Quinnox is an AI-first Digital Always organization orchestrating value for forward-looking businesses.” Source: RevenueBase Database · checked Sep 20, 2026
3	Q1 Technologies, INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	1,001-5,000	262 contacts →
	Indirect evidence “Q1 Technologies is a global IT solutions and services provider focused on delivering innovative, scalable, and high-impact technology outcomes for enterprises worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
4	Maven Wave, An Eviden Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	501-1,000	184 contacts →
	Indirect evidence “As of April 2023, Maven Wave is now part of Eviden, at Atos business.” Source: RevenueBase Database · checked Sep 20, 2026
5	RKON	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	163 contacts →
	Indirect evidence “Since 1998, RKON has delivered IT Transformation helping private equity and enterprise firms achieve Quiet IT from vision to execution.” Source: RevenueBase Database · checked Sep 20, 2026
6	Dunn Solutions, A Kaartech Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	1,001-5,000	141 contacts →
	Indirect evidence “Dunn Solutions is a digital commerce and business transformation consultancy focused on delivering velocity to our clients.” Source: RevenueBase Database · checked Sep 20, 2026
7	Aberdeen Advisors LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	85 contacts →
	Indirect evidence “Headquartered in Chicago, with satellite offices in India and Mexico, Aberdeen Advisors LLC is a boutique digital consultancy providing innovative products and services.” Source: RevenueBase Database · checked Sep 20, 2026
8	Adifice Technologies	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	59 contacts →
	Indirect evidence “Adifice Technologies is an IT development, services and products firm.” Source: RevenueBase Database · checked Sep 20, 2026
9	Logicon, LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	56 contacts →
	Indirect evidence “At Logicon, we help businesses streamline operations, reduce manual work, and make technology effortless.” Source: RevenueBase Database · checked Sep 20, 2026
10	Triangu	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	45 contacts →
	Indirect evidence “Triangu delivers end-to-end digital transformation for enterprises that need results, not just recommendations.” Source: RevenueBase Database · checked Sep 20, 2026
11	NPO USA INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	37 contacts →
	Indirect evidence “We are NPO USA!” Source: RevenueBase Database · checked Sep 20, 2026
12	Manifold	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	32 contacts →
	Indirect evidence “Manifold is a dynamic consultancy and technology partner helping organizations across industries unlock innovation, drive digital transformation, and achieve sustainable growth.” Source: RevenueBase Database · checked Sep 20, 2026
13	Revel Labs	Partial evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	31 contacts →
	Partial evidence “Revel Labs was founded from a legacy of leading Fortune 500 companies through technology fueled transformation, from ecommerce to cloud enablement to AI.” Source: RevenueBase Database · checked Sep 20, 2026
14	Origin	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “Origin is a new age consulting company born in the AI era that operates at the intersection of data analytics, AI and automation.” Source: RevenueBase Database · checked Sep 20, 2026
15	Actminds, INC	Indirect evidence	Chicago, United StatesHQ checked Sep 20, 2026	501-1,000	25 contacts →
	Indirect evidence “At Actminds we envision great outcomes in the partnership between our customers, employees, and alliances.” Source: RevenueBase Database · checked Sep 20, 2026
16	Aptlylabs	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	24 contacts →
	Indirect evidence “Empower your startup's vision by partnering with us to craft robust technology infrastructure tailored to your unique needs.” Source: RevenueBase Database · checked Sep 20, 2026
17	Pearl Consulting Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	22 contacts →
	Indirect evidence “Pearl Consulting Group is a global IT consulting firm dedicated to helping businesses navigate the complexities of technology with confidence.” Source: RevenueBase Database · checked Sep 20, 2026
18	Zivra, LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “Zivra is a boutique IT professional services firm founded by highly-experienced IT consulting executives.” Source: RevenueBase Database · checked Sep 20, 2026
19	Programmers US	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	201-500	17 contacts →
	Indirect evidence “A proven software development partner, Programmers Inc.” Source: RevenueBase Database · checked Sep 20, 2026
20	Mdrn Tech	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “At MDRN Tech, we dare to dream big, push boundaries and deliver a more modern way.” Source: RevenueBase Database · checked Sep 20, 2026
21	Next Dynamics	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	13 contacts →
	Indirect evidence “Next Dynamics is a management consulting and technology solutions firm focused on helping organizations navigate and execute meaningful digital transformation.” Source: RevenueBase Database · checked Sep 20, 2026
22	Davis Powers	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	11 contacts →
	Indirect evidence “For over 20 years, Davis Powers has been a trusted technology solutions provider committed to making sure business owners have the most reliable and professional IT services.” Source: RevenueBase Database · checked Sep 20, 2026
23	Spark Equation	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	11-50	11 contacts →
	Indirect evidence “Spark Equation is a full-service software-enabled IT and strategy consulting firm operating at the intersection of strategy, product design, and engineering to optimize solutions…” Source: RevenueBase Database · checked Sep 20, 2026
24	Amtech Analytics LLC	Indirect evidence	Chicago, United StatesHQ checked Sep 20, 2026	51-200	8 contacts →
	Indirect evidence “Amtech Analytics: Empowering Innovation through IT Consulting: Founded in 2023 by Kumarasenthil Muthuvel.” Source: RevenueBase Database · checked Sep 20, 2026
25	Prime TSR	Partial evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	8 contacts →
	Partial evidence “Prime TSR is a technology modernization consultancy.” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: legacy system modernization companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names legacy system modernization companies.
Partial evidence: Its own public description names part of legacy system modernization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name legacy system modernization companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 102 legacy system modernization companies based in Chicago, United States

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Legacy system modernization companies based in Chicago, United States at a glance

As of Sep 20, 2026

49.8%Verified-email coverage

67.5Average contacts per company

11-50Median size (employees)

199.0%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 102 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among legacy system modernization companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Chicago, United States whose own description of what they do matches “legacy system modernization companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names legacy system modernization companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among legacy system modernization companies, and records with no verified work email. Companies headquartered outside Chicago are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 3,429 across the full list. 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.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Legacy system modernization companies by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names legacy system modernization companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many legacy system modernization companies are there based in Chicago, United States?

RevenueBase identified 102 legacy system modernization companies headquartered in Chicago, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

AHEAD, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most legacy system modernization companies?

New York leads with 203 headquartered companies, followed by Austin (148) and Houston (131).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 3,429 verified decision-maker contacts tracked across these 102 companies.

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 Smart Search, 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.