Company lists · Data refreshed September 2026

Top 25 Cybersecurity contractors based in Chicago, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 139 companies tracked

RevenueBase identified 139 company matches for cybersecurity contractors associated with Chicago, United States as of September 2026 and tracks 5,086 professional contacts across them, including 2,238 with verified work emails. Across the United States, New York is the largest hub for this category (293 companies); Chicago has 139.

This list covers company matches for cybersecurity contractors 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 September 21, 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 Sep 21, 2026 How this list was built

139Companies

5,086Contacts tracked

2,238Verified emails

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The 25 largest cybersecurity contractors based in Chicago, United States

Ranked by team size

Top 25 of 139 company matches for cybersecurity contractors based in Chicago, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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	Titan Security Group	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,138 contacts →
	Exact match “At Titan Security Group, we understand that each client is unique, with specific security needs shaped by the type of property and its location.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	Coalfire	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1,001-5,000	947 contacts →
	Exact match “Coalfire is the premier Cybersecurity and Compliance Services leader for the tech, healthcare, and finance industries.(This page is maintained by Marketing.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Trustwave, A Levelblue Company	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	501-1,000	874 contacts →
	Exact match “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Vikingcloud	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1,001-5,000	628 contacts →
	Exact match “VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	AGB Investigative Services	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	501-1,000	240 contacts →
	Exact match “AGB is the largest black-owned, award winning security firm that opened in Chicago in 2001 and has grown to 1300+ employees.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Evolve Security Academy	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	n/a	166 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Crossrealms International	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	51-200	88 contacts →
	Exact match “CrossRealms International is a Cybersecurity-First company operating across the United States, Europe, MENA region, and Asia.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Entara	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	51-200	69 contacts →
	Exact match “Experiencing a security incident?” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Prudential Defense Solutions	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1,001-5,000	61 contacts →
	Exact match “Prudential Defense Solutions is a full‑service security provider offering professional guard services, door staff, and government‑contractor.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	NCC Group North America	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1,001-5,000	50 contacts →
	Exact match “Founded in we are NCC Group plc, a global leader in cyber security and business resilience.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	MIS Computer MSP	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	40 contacts →
	Exact match “MIS Computer: More Than An MSP.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Onshore Security A Cybermaxx Company	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	51-200	32 contacts →
	Exact match “We’ve moved!” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Chicago Fire Protection, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	51-200	29 contacts →
	Exact match “Chicago Fire Protection LLC is a full service, fire sprinkler/alarm contractor, signatory with Local 281 Sprinkler Fitters and IBEW Local 134 Electricians.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Securion	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	51-200	29 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Digitalmint	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	28 contacts →
	Exact match “DigitalMint Cyber is a globally trusted leader in ransomware incident response, providing end-to-end support for organizations facing cyber extortion.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	Abira Security	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	51-200	27 contacts →
	Exact match “In today’s digitally connected world, cyber security plays a crucial role.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Ravenswood Technology Group	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	21 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Kinetic Global	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	51-200	20 contacts →
	Exact match “Kinetic Global is a global duty of care and security company operating in more than 175 countries.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	Inner Valor, INC	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	201-500	12 contacts →
	Exact match “Inner Valor is a premier provider of White Glove Security℠ and corporate investigation services, offering elite and personalized solutions to protect your assets, people, and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	Willjam Ventures	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	11 contacts →
	Exact match “WillJam Ventures is a pioneer in the cybersecurity industry with an exceptional track record of investing in and operating world-class security service businesses.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Anomalix	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	11 contacts →
	Exact match “Anomalix is a cybersecurity company specializing in Third-Party Human, Nonhuman and AI Identity Governance and Risk Management.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	Skynet Security Systems	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	11 contacts →
	Exact match “SkyNet Security Systems was founded by a group of highly experienced and innovative security professionals who care about their clients.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Impelix	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	10 contacts →
	Exact match “Cyber threats are relentless, and security teams are overwhelmed.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Arxnimbus	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	10 contacts →
	Exact match “ArxNimbus brings visibility to every organization’s cybersecurity program, radically advancing how businesses understand and optimize for real resilience.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Hciss, LLC Bsecaenergy	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	10 contacts →
	Exact match “HCISS is an AI-Powered Cybersecurity company focused on helping organizations secure digital systems, sensitive data, and critical operations in an increasingly complex threat…” Recorded in the RevenueBase company graph · Sep 21, 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 “cybersecurity contractors”. 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 25 of 139 cybersecurity contractors based in Chicago, United States

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Cybersecurity contractors based in Chicago, United States at a glance

As of Sep 21, 2026

44.0%Verified-email coverage

36.6Average contacts per company

1-10Median size (employees)

Sep 21, 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 139 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 “cybersecurity contractors” 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 2,238 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 September 21, 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.

Cybersecurity contractors 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 “cybersecurity contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity contractors are there based in Chicago, United States?

RevenueBase identified 139 company matches for cybersecurity contractors associated with Chicago, United States as of September 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?

Titan Security Group 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 cybersecurity contractors?

New York leads the United States with 293 company records, followed by Washington (220) and Austin (170). Chicago has 139.

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 2,238 professional contacts with verified work emails tracked across these 139 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 September 21, 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.