Company lists · Data refreshed September 2026

Top 25 Infrastructure security companies based in Chicago, United States

Name: Infrastructure security 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 3, 2026 76 companies tracked

RevenueBase identified 76 infrastructure security companies headquartered in Chicago, United States as of September 2026 and tracks 2,309 professional contacts across them, including 1,271 with verified work emails. New York is the largest hub.

This list covers infrastructure security 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 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 3, 2026 86% judged on-target in blind review

76Companies

2,309Contacts tracked

1,271Verified emails

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The 25 largest infrastructure security companies based in Chicago, United States

Ranked by team size

Top 25 of 76 infrastructure security companies based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names infrastructure security companies: 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 3, 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 3, 2026
2	VikingcloudIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	1,001-5,000	618
	“VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: company website · checked Sep 3, 2026
3	Evolve Security AcademyPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	n/a	162
	“Evolve Security is a technical cybersecurity firm and the home of Evolve Academy, offering holistic and advanced cybersecurity training and continuously ranked #1 in the U.S.” Source: company website · checked Sep 3, 2026
4	EntaraPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	51-200	68
	“Experiencing a security incident?” Source: company website · checked Sep 3, 2026
5	Cyber Managed Services Inc. CybermsiIndirect evidence	Chicago, United StatesHQ checked Sep 3, 2026	51-200	39
	“We help mid-sized organizations prevent costly business disruptions from cyberattacks.” Source: company website · checked Sep 3, 2026
6	SecurionPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 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 3, 2026
7	Abira SecurityPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	51-200	27
	“In today’s digitally connected world, cyber security plays a crucial role.” Source: company website · checked Sep 3, 2026
8	Ravenswood Technology GroupIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 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 3, 2026
9	ImpelixPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	11-50	10
	“Cyber threats are relentless, and security teams are overwhelmed.” Source: company website · checked Sep 3, 2026
10	Hciss, LLC BsecaenergyIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	11-50	10
	“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: company website · checked Sep 3, 2026
11	Harrington Technology & Associates, INCPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 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 3, 2026
12	Data Defenders, LLCPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 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 3, 2026
13	Amol SolutionsIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	1-10	7
	“Amol Solutions strives to be a leader in cybersecurity services for organizations of all sizes.” Source: company website · checked Sep 3, 2026
14	Urbane SecurityPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 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 3, 2026
15	Crossrealms Middle EastIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 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 3, 2026
16	ClairosPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 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 3, 2026
17	Hellfire SecurityIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	11-50	6
	“Not auditors but real hackers.” Source: company website · checked Sep 3, 2026
18	Network AegisIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	1-10	5
	“Welcome to Network Aegis!” Source: company website · checked Sep 3, 2026
19	Clear Loss Prevention, INCPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	11-50	4
	“ClearLP is a woman owned business specializing in digital security and network technology.” Source: company website · checked Sep 3, 2026
20	Cyber Pop-UpIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	1-10	4
	“Cybersecurity for small businesses.” Source: company website · checked Sep 3, 2026
21	Apex IT And Cybersecurity SolutionsIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	51-200	4
	“Apex IT and Cybersecurity Solutions Inc is a leading Technology and Cybersecurity services firm based in Chicago, IL.” Source: company website · checked Sep 3, 2026
22	CybermetisIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	11-50	4
	“CyberMetis has collected some of the industry’s best minds and tools.” Source: company website · checked Sep 3, 2026
23	Wolf Point SecurityPartial evidence	Chicago, United StatesHQ checked Sep 3, 2026	1-10	4
	“Wolf Point Security is a cyber security consulting firm, plain and simple.” Source: company website · checked Sep 3, 2026
24	ApolloguardPartial evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	11-50	3
	“ApolloGuard provides offensive security services to help organizations stay ahead of threats.” Source: company website · checked Sep 3, 2026
25	GratitechIndirect evidence	Chicago, IL, United StatesHQ checked Sep 3, 2026	1-10	3
	“Gratitech works with large and mid-sized B2B and B2C organizations making technology and software more secure through NextGen full-stack cybersecurity.” Source: company website · checked Sep 3, 2026

Showing 25 of 76 infrastructure security companies based in Chicago, United States

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Infrastructure security companies based in Chicago, United States at a glance

As of Sep 3, 2026

1-10Median size (employees)

New YorkLargest hub · 141 HQs

Contacts with mobile numbers

Sep 3, 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 76 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 infrastructure security companies, 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 “infrastructure security companies”. 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 infrastructure security 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 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, 1,271 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 3, 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.

Infrastructure security companies by metro in the United States

Frequently asked

How many infrastructure security companies are there based in Chicago, United States?

RevenueBase identified 76 infrastructure security 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?

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

Which city has the most infrastructure security companies?

New York leads with 141 headquartered companies, followed by Washington (105) and Houston (98).

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 1,271 verified decision-maker contacts tracked across these 76 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 3, 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.