Company lists · Data refreshed September 2026
Top 23 IT security companies based in Chicago, United States
RevenueBase identified 98 IT security companies headquartered in Chicago, United States as of September 2026 and tracks 2,854 professional contacts across them, including 1,581 with verified work emails. New York is the largest hub.
This list covers IT 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 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.
The 23 largest IT security companies based in Chicago, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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, 2026Thanks. The Data Team will review it. | |||||
| 2 | 618 | ||||
“VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 262 | ||||
“Coro, the leading cybersecurity platform for small and mid-size businesses, empowers organizations to easily defend against malware, ransomware, phishing, data leakage, network…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 4 | 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 4, 2026Thanks. The Data Team will review it. | |||||
| 5 | EntaraPartial evidence | 68 | |||
“Experiencing a security incident?” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | MIS Computer MSPIndirect evidence | 40 | |||
“MIS Computer: More Than An MSP.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 7 | 39 | ||||
“We help mid-sized organizations prevent costly business disruptions from cyberattacks.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | Onshore Security A Cybermaxx CompanyIndirect evidence | 33 | |||
“We’ve moved!” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | SecurionPartial evidence | 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, 2026Thanks. The Data Team will review it. | |||||
| 10 | 27 | ||||
“In today’s digitally connected world, cyber security plays a crucial role.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | Ravenswood Technology GroupIndirect evidence | 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, 2026Thanks. The Data Team will review it. | |||||
| 12 | 10 | ||||
“Cyber threats are relentless, and security teams are overwhelmed.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 4, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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, 2026Thanks. The Data Team will review it. | |||||
| 15 | 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, 2026Thanks. The Data Team will review it. | |||||
| 16 | 7 | ||||
“Amol Solutions strives to be a leader in cybersecurity services for organizations of all sizes.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | Urbane SecurityPartial evidence | 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, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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, 2026Thanks. The Data Team will review it. | |||||
| 19 | 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, 2026Thanks. The Data Team will review it. | |||||
| 20 | 6 | ||||
“Not auditors but real hackers.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | 5 | ||||
“Welcome to Network Aegis!” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 22 | Triforma TechStrong evidence | 5 | |||
“From server maintenance to disaster recovery, cloud solutions, IT network cyber security, asset management and more, TriForma Tech is in the business of making your business…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 23 | 4 | ||||
“ClearLP is a woman owned business specializing in digital security and network technology.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 23 of 98 IT security companies based in Chicago, United States
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IT security companies based in Chicago, United States at a glance
As of Sep 4, 2026Companies by employee count
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 98 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 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 “IT 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 IT 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, 1,581 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 companies by metro in the United States
- IT security companies in New York163
- IT security companies in Miami102
- IT security companies in Houston99
- IT security companies in Chicago98
- IT security companies in Atlanta95
- IT security companies in Austin93
- IT security companies in Washington90
- IT security companies in San Francisco81
- IT security companies in Dallas80
- IT security companies in Tampa75
- IT security companies in Los Angeles59
- IT security companies in San Diego57
- IT security companies in Charlotte51
- IT security companies in Orlando50
- IT security companies in Boston48
- IT security companies in Columbia48
- IT security companies in Denver48
- IT security companies in Arlington45
- IT security companies in Las Vegas44
- IT security companies in Phoenix43
- IT security companies in San Antonio41
- IT security companies in Seattle36
- IT security companies in Reston33
- IT security companies in Baltimore32
- IT security companies in Scottsdale32
- IT security companies in Fairfax31
- IT security companies in Pittsburgh30
- IT security companies in Raleigh30
- IT security companies in Wilmington29
- IT security companies in Alexandria28
- IT security companies in Huntsville28
- IT security companies in Sheridan28
- IT security companies in Mclean27
Frequently asked
How many IT security companies are there based in Chicago, United States?
RevenueBase identified 98 IT 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 IT security companies?
New York leads with 163 headquartered companies, followed by Miami (102) and Houston (99).
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 1,581 verified decision-maker contacts tracked across these 98 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.
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