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 cybersecurity contractors headquartered in Chicago, United States as of September 2026 and tracks 5,086 professional contacts across them, including 2,238 with verified work emails. New York is the largest hub.

This list covers cybersecurity contractors 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 21, 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 21, 2026 86% judged on-target in blind review

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 cybersecurity contractors based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity contractors: 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	Titan Security Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,138 contacts →
	Indirect evidence “At Titan Security Group, we understand that each client is unique, with specific security needs shaped by the type of property and its location.” Source: RevenueBase Database · checked Sep 21, 2026
2	Coalfire	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	947 contacts →
	Partial 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 21, 2026
3	Trustwave, A Levelblue Company	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	874 contacts →
	Partial 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 21, 2026
4	Vikingcloud	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	628 contacts →
	Partial evidence “VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: RevenueBase Database · checked Sep 21, 2026
5	AGB Investigative Services	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	240 contacts →
	Indirect evidence “AGB is the largest black-owned, award winning security firm that opened in Chicago in 2001 and has grown to 1300+ employees.” Source: RevenueBase Database · checked Sep 21, 2026
6	Evolve Security Academy	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	n/a	166 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
7	Crossrealms International	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	88 contacts →
	Partial evidence “CrossRealms International is a Cybersecurity-First company operating across the United States, Europe, MENA region, and Asia.” Source: RevenueBase Database · checked Sep 21, 2026
8	Entara	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	69 contacts →
	Indirect evidence “Experiencing a security incident?” Source: RevenueBase Database · checked Sep 21, 2026
9	Prudential Defense Solutions	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	61 contacts →
	Partial evidence “Prudential Defense Solutions is a full‑service security provider offering professional guard services, door staff, and government‑contractor.” Source: RevenueBase Database · checked Sep 21, 2026
10	NCC Group North America	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 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 21, 2026
11	MIS Computer MSP	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	40 contacts →
	Indirect evidence “MIS Computer: More Than An MSP.” Source: RevenueBase Database · checked Sep 21, 2026
12	Onshore Security A Cybermaxx Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	32 contacts →
	Indirect evidence “We’ve moved!” Source: RevenueBase Database · checked Sep 21, 2026
13	Chicago Fire Protection, LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	29 contacts →
	Partial evidence “Chicago Fire Protection LLC is a full service, fire sprinkler/alarm contractor, signatory with Local 281 Sprinkler Fitters and IBEW Local 134 Electricians.” Source: RevenueBase Database · checked Sep 21, 2026
14	Securion	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 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 21, 2026
15	Digitalmint	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	28 contacts →
	Indirect evidence “DigitalMint Cyber is a globally trusted leader in ransomware incident response, providing end-to-end support for organizations facing cyber extortion.” Source: RevenueBase Database · checked Sep 21, 2026
16	Abira Security	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	27 contacts →
	Indirect evidence “In today’s digitally connected world, cyber security plays a crucial role.” Source: RevenueBase Database · checked Sep 21, 2026
17	Ravenswood Technology Group	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	21 contacts →
	Partial 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 21, 2026
18	Kinetic Global	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	20 contacts →
	Indirect evidence “Kinetic Global is a global duty of care and security company operating in more than 175 countries.” Source: RevenueBase Database · checked Sep 21, 2026
19	Inner Valor, INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	12 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026
20	Willjam Ventures	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1-10	11 contacts →
	Partial evidence “WillJam Ventures is a pioneer in the cybersecurity industry with an exceptional track record of investing in and operating world-class security service businesses.” Source: RevenueBase Database · checked Sep 21, 2026
21	Anomalix	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	11 contacts →
	Partial evidence “Anomalix is a cybersecurity company specializing in Third-Party Human, Nonhuman and AI Identity Governance and Risk Management.” Source: RevenueBase Database · checked Sep 21, 2026
22	Skynet Security Systems	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	11 contacts →
	Indirect evidence “SkyNet Security Systems was founded by a group of highly experienced and innovative security professionals who care about their clients.” Source: RevenueBase Database · checked Sep 21, 2026
23	Impelix	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	10 contacts →
	Indirect evidence “Cyber threats are relentless, and security teams are overwhelmed.” Source: RevenueBase Database · checked Sep 21, 2026
24	Arxnimbus	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial 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 21, 2026
25	Hciss, LLC Bsecaenergy	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial 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 21, 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 contractors. 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 contractors.
Partial evidence: Its own public description names part of cybersecurity contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity contractors. 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 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)

210.8%Largest-city concentration · New York

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

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among cybersecurity contractors, 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 contractors”. 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 contractors), 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 contractors, 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, 2,238 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 21, 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 contractors 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 contractors, 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 contractors are there based in Chicago, United States?

RevenueBase identified 139 cybersecurity contractors 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?

Titan Security Group, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most cybersecurity contractors?

New York leads with 293 headquartered companies, followed by Washington (220) and Austin (170).

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 2,238 verified decision-maker contacts tracked across these 139 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 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 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.