Company lists · Data refreshed September 2026
Top 25 Biggest security companies based in Chicago, United States
RevenueBase identified 116 biggest security companies headquartered in Chicago, United States as of September 2026 and tracks 4,932 professional contacts across them, including 2,167 with verified work emails. New York is the largest hub.
This list covers biggest 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, 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.
The 25 largest biggest security companies based in Chicago, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,138 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 2 | 947 contacts → | ||||
Indirect 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, 2026Thanks. The Data Team will review it. | |||||
| 3 | 874 contacts → | ||||
Indirect 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 628 contacts → | ||||
Indirect evidence “VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 319 contacts → | ||||
Indirect evidence “We're an award-winning Technology Solution Provider dedicated to safeguarding organizations across the United States.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 88 contacts → | ||||
Indirect evidence “CrossRealms International is a Cybersecurity-First company operating across the United States, Europe, MENA region, and Asia.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 69 contacts → | ||||
Partial evidence “Experiencing a security incident?” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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, 2026Thanks. The Data Team will review it. | |||||
| 9 | 59 contacts → | ||||
Partial evidence “Evolve Security is an offensive cybersecurity solution, delivering continuous penetration testing with the optimal blend of AI automation and human expertise, providing peace of…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 40 contacts → | ||||
Indirect evidence “MIS Computer: More Than An MSP.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 32 contacts → | ||||
Indirect evidence “We’ve moved!” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 29 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 13 | 27 contacts → | ||||
Partial evidence “In today’s digitally connected world, cyber security plays a crucial role.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 27 contacts → | ||||
Indirect evidence “Trusted protection and investigative services with a commitment to excellence.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 21 contacts → | ||||
Indirect 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, 2026Thanks. The Data Team will review it. | |||||
| 16 | 20 contacts → | ||||
Partial evidence “Kinetic Global is a global duty of care and security company operating in more than 175 countries.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 13 contacts → | ||||
Partial evidence “Universal Security, founded by retired Chicago Police Officer Mark Lundgren in August 1992, proudly carries a legacy of security excellence.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 12 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 19 | 11 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 20 | 10 contacts → | ||||
Partial evidence “Cyber threats are relentless, and security teams are overwhelmed.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 10 contacts → | ||||
Partial evidence “Security Consulting | Private Investigations | Law Enforcement Consulting | McCarthy Byrnes is a trusted security, investigations, and public safety advisory firm providing…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 10 contacts → | ||||
Partial evidence “Head of Security is a Chicago-based security risk management consulting firm that utilizes behavioral-science and protective-intelligence to help people, organizations, and…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 9 contacts → | ||||
Partial evidence “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: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 9 contacts → | ||||
Partial evidence “Data Defenders is at the forefront of Managed Cybersecurity Operations Providers (MCOP), specializing in safeguarding municipalities through our exclusive Regional Security…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 8 contacts → | ||||
Partial evidence “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: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
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: biggest security companies. 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 biggest security companies.
- Partial evidence
- Its own public description names part of biggest security companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name biggest security companies. 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 116 biggest security companies based in Chicago, United States
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Biggest security companies based in Chicago, United States at a glance
As of Sep 21, 2026Companies by employee count
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 116 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 biggest security companies, 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 “biggest security companies”. 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 biggest security companies), 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 biggest 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 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, 2,167 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.
Biggest security companies by metro in the United States
- Biggest security companies in New York214
- Biggest security companies in Houston149
- Biggest security companies in Washington143
- Biggest security companies in Miami126
- Biggest security companies in Atlanta125
- Biggest security companies in Dallas118
- Biggest security companies in Chicago116
- Biggest security companies in Austin115
- Biggest security companies in Los Angeles90
- Biggest security companies in Tampa90
- Biggest security companies in San Francisco75
- Biggest security companies in Arlington72
- Biggest security companies in Columbia66
- Biggest security companies in Reston63
- Biggest security companies in Charlotte62
- Biggest security companies in Denver61
- Biggest security companies in San Diego61
- Biggest security companies in Mclean58
- Biggest security companies in San Antonio58
- Biggest security companies in Orlando56
- Biggest security companies in Alexandria55
- Biggest security companies in Las Vegas55
- Biggest security companies in Baltimore52
- Biggest security companies in Boston52
- Biggest security companies in Phoenix51
- Biggest security companies in Seattle46
- Biggest security companies in Ashburn44
- Biggest security companies in Raleigh44
- Biggest security companies in Herndon43
- Biggest security companies in Fairfax41
- Biggest security companies in Huntsville41
- Biggest security companies in Vienna36
- Biggest security companies in San Jose35
- Biggest security companies in Wilmington35
- Biggest security companies in Pittsburgh34
- Biggest security companies in Portland33
- Biggest security companies in Scottsdale33
- Biggest security companies in Sheridan33
- Biggest security companies in Chantilly32
- Biggest security companies in Colorado Springs31
- Biggest security companies in Minneapolis30
- Biggest security companies in Indianapolis29
- Biggest security companies in Richmond29
- Biggest security companies in Columbus28
- Biggest security companies in Fort Lauderdale27
- Biggest security companies in Irvine27
- Biggest security companies in Nashville27
- Biggest security companies in Plano27
- Biggest security companies in Springfield26
- Biggest security companies in Dover25
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 biggest security companies, 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 biggest security companies are there based in Chicago, United States?
RevenueBase identified 116 biggest 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?
Titan Security Group, headquartered in Chicago, tops this list with the largest team on record.
Which city has the most biggest security companies?
New York leads with 214 headquartered companies, followed by Houston (149) and Washington (143).
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 2,167 verified decision-maker contacts tracked across these 116 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.
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