Company lists · Data refreshed September 2026
Top 25 Managed security services companies based in Chicago, United States
RevenueBase identified 64 managed security services companies headquartered in Chicago, United States as of September 2026 and tracks 2,557 professional contacts across them, including 810 with verified work emails. New York is the largest hub.
This list covers managed security services 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 5, 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 25 largest managed security services companies based in Chicago, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,138 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 874 | ||||
“Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | EntaraPartial evidence | 69 | |||
“Experiencing a security incident?” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | MIS Computer MSPIndirect evidence | 40 | |||
“MIS Computer: More Than An MSP.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Onshore Security A Cybermaxx CompanyIndirect evidence | 32 | |||
“We’ve moved!” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | SecurionPartial evidence | 29 | |||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 27 | ||||
“In today’s digitally connected world, cyber security plays a crucial role.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 19 | ||||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 18 | ||||
“Halo Security Group is a Chicago-based professional security services company providing comprehensive and reliable protection for businesses, residential communities, and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 10 | ||||
“Cyber threats are relentless, and security teams are overwhelmed.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 9 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 8 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 7 | ||||
“At Cyber Bark, we bring 100 years of collective experience to the table, serving businesses across the US from our base in Illinois.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 7 | ||||
“Full Service Security Provider, Alarm Response, Patrol, Armed Security, Unarmed Security, Off Duty Police, Alarm Installation and Monitoring, CCTV Cameras, Access Control.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 7 | ||||
“Amol Solutions strives to be a leader in cybersecurity services for organizations of all sizes.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 6 | ||||
“Not auditors but real hackers.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 5 | ||||
“Welcome to Network Aegis!” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | Urbane SecurityPartial evidence | 4 | |||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 4 | ||||
“Apex IT and Cybersecurity Solutions Inc is a leading Technology and Cybersecurity services firm based in Chicago, IL.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 4 | ||||
“CyberMetis has collected some of the industry’s best minds and tools.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | RED Door TechnologiesIndirect evidence | 3 | |||
“Red Door Technologies has protected Chicago small businesses since 2009.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | ProtecteditStrong evidence | 2 | |||
“Founded 2019 in Chicago by a team with industry expertise, ProtectedIT is a Managed Security Services Provider delivering remote infrastructure management, cloud adoption…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 64 managed security services companies based in Chicago, United States
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Managed security services companies based in Chicago, United States at a glance
As of Sep 5, 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 64 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 managed security services 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 “managed security services 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 managed security services 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, 810 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 5, 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.
Managed security services companies by metro in the United States
- Managed security services companies in New York103
- Managed security services companies in Houston85
- Managed security services companies in Miami81
- Managed security services companies in Austin65
- Managed security services companies in Chicago64
- Managed security services companies in Dallas63
- Managed security services companies in Atlanta60
- Managed security services companies in Los Angeles57
- Managed security services companies in Tampa47
- Managed security services companies in San Francisco43
- Managed security services companies in Washington43
- Managed security services companies in Charlotte39
- Managed security services companies in Las Vegas38
- Managed security services companies in San Diego37
- Managed security services companies in Denver35
- Managed security services companies in Phoenix34
- Managed security services companies in Irvine30
- Managed security services companies in Arlington26
- Managed security services companies in Columbia26
- Managed security services companies in Orlando26
- Managed security services companies in Scottsdale25
- Managed security services companies in Wilmington25
Frequently asked
How many managed security services companies are there based in Chicago, United States?
RevenueBase identified 64 managed security services 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?
Titan Security Group, headquartered in Chicago, tops this list with the largest team on record.
Which city has the most managed security services companies?
New York leads with 103 headquartered companies, followed by Houston (85) and Miami (81).
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 810 verified decision-maker contacts tracked across these 64 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 5, 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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