Company lists · Data refreshed September 2026

Top 25 Cybersecurity service providers based in Chicago, United States

Name: Cybersecurity service providers based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 121 companies tracked

RevenueBase identified 121 cybersecurity service providers headquartered in Chicago, United States as of September 2026 and tracks 3,373 professional contacts across them, including 1,783 with verified work emails. New York is the largest hub.

This list covers cybersecurity service providers 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 14, 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 14, 2026 86% judged on-target in blind review

121Companies

3,373Contacts tracked

1,783Verified emails

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The 25 largest cybersecurity service providers based in Chicago, United States

Ranked by team size

Top 25 of 121 cybersecurity service providers based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity service providers: 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	Coalfire	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	1,001-5,000	947 contacts →
	Strong evidence “Coalfire is the premier Cybersecurity and Compliance Services leader for the tech, healthcare, and finance industries.(This page is maintained by Marketing.” Source: RevenueBase Database · checked Sep 14, 2026
2	Trustwave, A Levelblue Company	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	501-1,000	874 contacts →
	Strong evidence “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: RevenueBase Database · checked Sep 14, 2026
3	Vikingcloud	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	1,001-5,000	628 contacts →
	Strong evidence “VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: RevenueBase Database · checked Sep 14, 2026
4	Empist	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	89 contacts →
	Indirect evidence “At EMPIST, our mission is to fuel businesses with the technology they need to succeed.” Source: RevenueBase Database · checked Sep 14, 2026
5	Crossrealms International	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	88 contacts →
	Strong evidence “CrossRealms International is a Cybersecurity-First company operating across the United States, Europe, MENA region, and Asia.” Source: RevenueBase Database · checked Sep 14, 2026
6	Entara	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	69 contacts →
	Indirect evidence “Experiencing a security incident?” Source: RevenueBase Database · checked Sep 14, 2026
7	Evolve Security	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	59 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 14, 2026
8	NCC Group North America	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	1,001-5,000	50 contacts →
	Indirect evidence “Founded in we are NCC Group plc, a global leader in cyber security and business resilience.” Source: RevenueBase Database · checked Sep 14, 2026
9	MIS Computer MSP	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	40 contacts →
	Indirect evidence “MIS Computer: More Than An MSP.” Source: RevenueBase Database · checked Sep 14, 2026
10	Onshore Security A Cybermaxx Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	32 contacts →
	Indirect evidence “We’ve moved!” Source: RevenueBase Database · checked Sep 14, 2026
11	Securion	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	29 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 14, 2026
12	Abira Security	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	27 contacts →
	Indirect evidence “In today’s digitally connected world, cyber security plays a crucial role.” Source: RevenueBase Database · checked Sep 14, 2026
13	Ravenswood Technology Group	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	21 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 14, 2026
14	Impelix	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	10 contacts →
	Indirect evidence “Cyber threats are relentless, and security teams are overwhelmed.” Source: RevenueBase Database · checked Sep 14, 2026
15	Arxnimbus	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	10 contacts →
	Strong evidence “ArxNimbus brings visibility to every organization’s cybersecurity program, radically advancing how businesses understand and optimize for real resilience.” Source: RevenueBase Database · checked Sep 14, 2026
16	Hciss, LLC Bsecaenergy	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	10 contacts →
	Strong evidence “HCISS is an AI-Powered Cybersecurity company focused on helping organizations secure digital systems, sensitive data, and critical operations in an increasingly complex threat…” Source: RevenueBase Database · checked Sep 14, 2026
17	Agrada	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	1-10	9 contacts →
	Indirect evidence “Agrada Group provides clear and sustainable solutions to secure and grow your company.” Source: RevenueBase Database · checked Sep 14, 2026
18	Harrington Technology & Associates, INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	9 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 14, 2026
19	Data Defenders, LLC	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	9 contacts →
	Strong evidence “Data Defenders is at the forefront of Managed Cybersecurity Operations Providers (MCOP), specializing in safeguarding municipalities through our exclusive Regional Security…” Source: RevenueBase Database · checked Sep 14, 2026
20	Dataguard	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	8 contacts →
	Strong evidence “DataGuard Cybersecurity Without The Complexity DataGuard uses state-of-the-art industry resources to implement a multi-layer defense for each client’s unique cyber security needs.” Source: RevenueBase Database · checked Sep 14, 2026
21	Cyber Bark LLC	Indirect evidence	Chicago, United StatesHQ checked Sep 14, 2026	51-200	7 contacts →
	Indirect evidence “At Cyber Bark, we bring 100 years of collective experience to the table, serving businesses across the US from our base in Illinois.” Source: RevenueBase Database · checked Sep 14, 2026
22	JMA Consulting LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	1-10	7 contacts →
	Indirect evidence “JMA Consulting, LLC brings secure IT solutions to commercial clients in multiple industries nationwide.” Source: RevenueBase Database · checked Sep 14, 2026
23	Microtech Leaders	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	1-10	7 contacts →
	Indirect evidence “OUR COMPANY Microtech Leaders is a full spectrum global technology solution partner and managed service provider committed to helping small & medium size businesses build and…” Source: RevenueBase Database · checked Sep 14, 2026
24	Amol Solutions	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	1-10	7 contacts →
	Strong evidence “Amol Solutions strives to be a leader in cybersecurity services for organizations of all sizes.” Source: RevenueBase Database · checked Sep 14, 2026
25	Clairos	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	6 contacts →
	Strong evidence “Clairos is a cybersecurity company that helps organizations build stronger, more manageable security programs through a practical, tailored approach.” Source: RevenueBase Database · checked Sep 14, 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: cybersecurity service providers. 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 cybersecurity service providers.
Partial evidence: Its own public description names part of cybersecurity service providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity service providers. 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 121 cybersecurity service providers based in Chicago, United States

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Cybersecurity service providers based in Chicago, United States at a glance

As of Sep 14, 2026

52.9%Verified-email coverage

27.9Average contacts per company

1-10Median size (employees)

224.0%Largest-city concentration · New York

Sep 14, 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 121 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 cybersecurity service providers, 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 “cybersecurity service providers”. 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 cybersecurity service providers), 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 cybersecurity service providers, 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, 1,783 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 14, 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.

Cybersecurity service providers 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 cybersecurity service providers, 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 cybersecurity service providers are there based in Chicago, United States?

RevenueBase identified 121 cybersecurity service providers 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 cybersecurity service providers?

New York leads with 271 headquartered companies, followed by Houston (160) and Atlanta (148).

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 1,783 verified decision-maker contacts tracked across these 121 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 14, 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.