Company lists · Data refreshed September 2026
Top 25 Managed security service providers based in Chicago, United States
RevenueBase identified 100 managed security service providers headquartered in Chicago, United States as of September 2026 and tracks 3,376 professional contacts across them, including 1,764 with verified work emails. New York is the largest hub.
This list covers managed security service providers 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 service providers based in Chicago, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 947 | ||||
“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 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 | 628 | ||||
“VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 166 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 88 | ||||
“CrossRealms International is a Cybersecurity-First company operating across the United States, Europe, MENA region, and Asia.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | EntaraPartial evidence | 69 | |||
“Experiencing a security incident?” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 50 | ||||
“Founded in we are NCC Group plc, a global leader in cyber security and business resilience.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | MIS Computer MSPIndirect evidence | 40 | |||
“MIS Computer: More Than An MSP.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | Onshore Security A Cybermaxx CompanyIndirect evidence | 32 | |||
“We’ve moved!” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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. | |||||
| 11 | 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. | |||||
| 12 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 10 | ||||
“Cyber threats are relentless, and security teams are overwhelmed.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 10 | ||||
“ArxNimbus brings visibility to every organization’s cybersecurity program, radically advancing how businesses understand and optimize for real resilience.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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. | |||||
| 18 | 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. | |||||
| 19 | 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. | |||||
| 20 | 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. | |||||
| 21 | 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. | |||||
| 22 | 6 | ||||
“Not auditors but real hackers.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 5 | ||||
“Welcome to Network Aegis!” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | TeamwerksIndirect evidence | 5 | |||
“TeamWerks is an IT company based in the United States.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | 5 | ||||
“Havoc Shield helps insurance brokers and agencies write more cyber policies through a proactive Risk Assessment Scorecard, aligned to insurance carrier app questions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 100 managed security service providers based in Chicago, United States
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Managed security service providers 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 100 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 service providers, 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 service providers”. 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 service providers, 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, 1,764 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 service providers by metro in the United States
- Managed security service providers in New York200
- Managed security service providers in Houston120
- Managed security service providers in Austin117
- Managed security service providers in Atlanta114
- Managed security service providers in Washington107
- Managed security service providers in Miami106
- Managed security service providers in Chicago100
- Managed security service providers in Dallas100
- Managed security service providers in Tampa94
- Managed security service providers in San Francisco86
- Managed security service providers in Charlotte61
- Managed security service providers in Los Angeles60
- Managed security service providers in Columbia56
- Managed security service providers in Arlington54
- Managed security service providers in San Diego53
- Managed security service providers in Denver52
- Managed security service providers in Orlando52
- Managed security service providers in Boston51
- Managed security service providers in Las Vegas51
- Managed security service providers in San Antonio48
- Managed security service providers in Phoenix47
- Managed security service providers in Seattle39
- Managed security service providers in Reston38
- Managed security service providers in Wilmington38
- Managed security service providers in Alexandria37
- Managed security service providers in Irvine36
- Managed security service providers in Mclean36
- Managed security service providers in Sheridan36
- Managed security service providers in Fairfax34
- Managed security service providers in Raleigh33
- Managed security service providers in Huntsville32
- Managed security service providers in Portland32
- Managed security service providers in San Jose31
- Managed security service providers in Baltimore30
- Managed security service providers in Pittsburgh30
- Managed security service providers in Scottsdale30
- Managed security service providers in Plano29
- Managed security service providers in Fort Lauderdale28
- Managed security service providers in Colorado Springs27
- Managed security service providers in Ashburn26
- Managed security service providers in Dover26
- Managed security service providers in Richmond25
Frequently asked
How many managed security service providers are there based in Chicago, United States?
RevenueBase identified 100 managed security service providers 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 managed security service providers?
New York leads with 200 headquartered companies, followed by Houston (120) and Austin (117).
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 1,764 verified decision-maker contacts tracked across these 100 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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