Company lists · Data refreshed September 2026

Top 24 IT security consulting firms based in Chicago, United States

Name: IT security consulting firms based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 113 companies tracked

RevenueBase identified 113 IT security consulting firms headquartered in Chicago, United States as of September 2026 and tracks 2,348 professional contacts across them, including 1,354 with verified work emails. New York is the largest hub.

This list covers IT security consulting firms 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, how directly it supports the match, and when it was last checked. Data refreshed September 4, 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 HQ checked on every row Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

113Companies

2,348Contacts tracked

1,354Verified emails

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The 24 largest IT security consulting firms based in Chicago, United States

Ranked by team size

Top 24 of 113 IT security consulting firms based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names IT security consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	CoalfireIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	1,001-5,000	960
	“Coalfire is the premier Cybersecurity and Compliance Services leader for the tech, healthcare, and finance industries.(This page is maintained by Marketing.” Source: company website · checked Sep 4, 2026
2	VikingcloudIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	1,001-5,000	618
	“VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: company website · checked Sep 4, 2026
3	EntaraPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	68
	“Experiencing a security incident?” Source: company website · checked Sep 4, 2026
4	Evolve SecurityPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	57
	“Evolve Security is an offensive cybersecurity solution, delivering continuous penetration testing with the optimal blend of AI automation and human expertise, providing peace of…” Source: company website · checked Sep 4, 2026
5	Cyber Managed Services Inc. CybermsiIndirect evidence	Chicago, United StatesHQ checked Sep 4, 2026	51-200	39
	“We help mid-sized organizations prevent costly business disruptions from cyberattacks.” Source: company website · checked Sep 4, 2026
6	Hillard Heintze, A Jensen Hughes CompanyIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	31
	“In April, 2019 Hillard Heintze joined Jensen Hughes.” Source: company website · checked Sep 4, 2026
7	SecurionPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	30
	“SECURION was formed by industry problem-solving veterans that came together to bring their vision of a completely security focused, vendor agnostic, secure by design approach.” Source: company website · checked Sep 4, 2026
8	Abira SecurityPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	27
	“In today’s digitally connected world, cyber security plays a crucial role.” Source: company website · checked Sep 4, 2026
9	Ravenswood Technology GroupIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	21
	“At Ravenswood Technology Group, we don’t just offer our customers cybersecurity solutions – we deliver value and expertise you can rely on as needs and risks change.” Source: company website · checked Sep 4, 2026
10	Pearl Consulting GroupStrong evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	19
	“Pearl Consulting Group is a global IT consulting firm dedicated to helping businesses navigate the complexities of technology with confidence.” Source: company website · checked Sep 4, 2026
11	SecuretrustPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	201-500	18
	“SecureTrust™, a Sysnet company, leads the industry in innovation and processes for achieving and maintaining compliance and security.” Source: company website · checked Sep 4, 2026
12	ScalesologyPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	16
	“Scalesology is a data analytics, software development, and cybersecurity consulting company.” Source: company website · checked Sep 4, 2026
13	Skynet Security SystemsPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	11
	“SkyNet Security Systems was founded by a group of highly experienced and innovative security professionals who care about their clients.” Source: company website · checked Sep 4, 2026
14	ImpelixPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	10
	“Cyber threats are relentless, and security teams are overwhelmed.” Source: company website · checked Sep 4, 2026
15	Mccarthy ByrnesStrong evidence	Chicago, United StatesHQ checked Sep 4, 2026	11-50	10
	“Security Consulting \| Private Investigations \| Law Enforcement Consulting \| McCarthy Byrnes is a trusted security, investigations, and public safety advisory firm providing…” Source: company website · checked Sep 4, 2026
16	Harrington Technology & Associates, INCStrong evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	9
	“HTA Technology Security Consulting (HTA) is a certified Woman-Owned, Small, Disadvantaged, Minority business with offices in Chicago, IL, and the Washington DC corridor.” Source: company website · checked Sep 4, 2026
17	AgradaIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	1-10	8
	“Agrada Group provides clear and sustainable solutions to secure and grow your company.” Source: company website · checked Sep 4, 2026
18	Data Defenders, LLCPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	8
	“Data Defenders is at the forefront of Managed Cybersecurity Operations Providers (MCOP), specializing in safeguarding municipalities through our exclusive Regional Security…” Source: company website · checked Sep 4, 2026
19	JMA Consulting LLCStrong evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	1-10	7
	“JMA Consulting, LLC brings secure IT solutions to commercial clients in multiple industries nationwide.” Source: company website · checked Sep 4, 2026
20	Amol SolutionsIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	1-10	7
	“Amol Solutions strives to be a leader in cybersecurity services for organizations of all sizes.” Source: company website · checked Sep 4, 2026
21	Urbane SecurityPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	6
	“Urbane Security is an information security firm that provides specially tailored security and compliance solutions that empower the Fortune 500 to securely focus on their ultimate…” Source: company website · checked Sep 4, 2026
22	Crossrealms Middle EastIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	6
	“CrossRealms is a premier Cybersecurity and Managed Services provider with multiple locations in the United States, Canada, Europe, MENA region, and Asia.” Source: company website · checked Sep 4, 2026
23	ClairosPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	6
	“Clairos is a cybersecurity company that helps organizations build stronger, more manageable security programs through a practical, tailored approach.” Source: company website · checked Sep 4, 2026
24	Hellfire SecurityIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	6
	“Not auditors but real hackers.” Source: company website · checked Sep 4, 2026

Showing 24 of 113 IT security consulting firms based in Chicago, United States

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IT security consulting firms based in Chicago, United States at a glance

As of Sep 4, 2026

1-10Median size (employees)

New YorkLargest hub · 239 HQs

Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 113 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 IT security consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “IT security consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among IT security consulting firms, 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 an evidence 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, 1,354 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 4, 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.

IT security consulting firms by metro in the United States

Frequently asked

How many IT security consulting firms are there based in Chicago, United States?

RevenueBase identified 113 IT security consulting firms 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?

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

Which city has the most IT security consulting firms?

New York leads with 239 headquartered companies, followed by Houston (148) and Atlanta (139).

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 1,354 verified decision-maker contacts tracked across these 113 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 4, 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.