Company lists · Data refreshed September 2026
Top 17 Security companies based in Denver, United States
This directory lists 56 security companies based in Denver, United States, with 2,452 contacts and 149 email addresses for business research and outreach. As of September 2026, New York is the single most-represented city among the companies on the list.
Security companies provide services, systems, or products that protect people, property, facilities, data, networks, or other assets from security threats. This list covers companies that provide security products or services, including physical security, cybersecurity, monitoring, access control, risk management, and related protection solutions. Ranked by team size, largest first. Data current as of September 6, 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 17 largest security companies based in Denver, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,727 | ||||
“HSS is now Tarian!” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | Twin City Security, INCStrong evidence | 157 | |||
“Quality armed and unarmed security officer services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | National Fire & SafetyIndirect evidence | 90 | |||
“Fire detection and suppression systems are essential to the safety of lives and property.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 64 | ||||
“Advanced Professional Security (APS) is a national security guard and patrol firm.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | Mathias Lock And KEY And SecurityIndirect evidence | 28 | |||
“There are many things beyond our control in business today; the economy, competition, escalating operating costs.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | ETG Systems INCStrong evidence | 21 | |||
“ETG Systems is a technology company specializing in security integration and fire suppression systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | Scout SecurityStrong evidence | 19 | |||
“Scout Security (SS) is a private security business committed to closing the gap between law enforcement and security by providing targeted patrols and dedicated guards in your…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | MAX Security INCStrong evidence | 15 | |||
“Max Security Inc- We install Burglar, Fire, and Camera Systems for both residential and commercial customers.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | Pontem SecurityStrong evidence | 10 | |||
“Our security experience goes back more than a decade and we have worked all jobs - large and small.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | TRT DefenseStrong evidence | 9 | |||
“TRT Defense provides security professionals who are state licensed, well qualified, experienced and committed to exceptional customer service.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | M. R. Solutions, INCStrong evidence | 6 | |||
“We are an Electronic Security Integrator specializing in CCTV, Intrusion Detection and Acces Control Systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | Gen1 ProtectionIndirect evidence | 4 | |||
“Gen1 Protection is a company based out of 4819 King St, Denver, Colorado, United States.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | Onyx Protection Services LLCIndirect evidence | 3 | |||
“Our accountability is second to none with complete 24/7 transparency, GPS date and time stamping on all incidents, and instant access to all reporting as incidents occur.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 2 | ||||
“At Auctus Security, our mission is to protect and empower our clients through integrity, professionalism, and modern security solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | Mathias Lock And Key, INCIndirect evidence | 2 | |||
Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | Reliable Home TechnologyStrong evidence | 1 | |||
“Our executive team has over 50 years of expertise in the security industry in Colorado.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | Netech Solutions LLCStrong evidence | 1 | |||
“NeTech is a business that can help others while helping to ensure safety and security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 17 of 56 security companies based in Denver, United States
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Security companies based in Denver, United States at a glance
As of Sep 6, 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 Denver, over 56 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 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 Denver, United States whose own description of what they do matches “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 security companies, and records with no verified work email. Companies headquartered outside Denver 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, 149 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 6, 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.
Security companies by metro in the United States
- Security companies in New York224
- Security companies in Los Angeles187
- Security companies in Houston184
- Security companies in Miami154
- Security companies in Chicago102
- Security companies in Atlanta99
- Security companies in Dallas99
- Security companies in Austin84
- Security companies in Phoenix84
- Security companies in Las Vegas67
- Security companies in Orlando66
- Security companies in San Antonio59
- Security companies in Tampa59
- Security companies in Charlotte56
- Security companies in Denver56
- Security companies in San Diego55
- Security companies in Indianapolis46
- Security companies in Sacramento46
- Security companies in San Francisco45
- Security companies in San Jose45
- Security companies in Jacksonville44
- Security companies in Seattle44
- Security companies in Baltimore42
- Security companies in Nashville37
- Security companies in Fort Lauderdale36
- Security companies in Columbus34
- Security companies in Memphis34
- Security companies in Portland34
- Security companies in Washington34
- Security companies in Philadelphia32
- Security companies in Raleigh32
- Security companies in Columbia31
- Security companies in Fort Worth31
- Security companies in Cincinnati30
- Security companies in Brooklyn29
- Security companies in Louisville28
- Security companies in Wilmington28
- Security companies in Albuquerque26
- Security companies in Richmond26
- Security companies in Riverside26
- Security companies in Springfield26
- Security companies in Boca Raton25
- Security companies in Boston25
- Security companies in Colorado Springs25
- Security companies in Irvine25
Frequently asked
How many security companies are based in Denver, United States?
RevenueBase counts 56 security companies based in Denver, United States on this list.
How many contacts and email addresses are available for security companies?
The list includes 2,452 contacts and 149 email addresses for security companies.
Which city has the most security companies on the list?
New York is the single most-represented city among the companies on the list.
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Security companies by geography
- Security companies based in the United States
- Security companies based in the United Kingdom
- Security companies based in Brazil
- Security companies based in France
- Security companies based in Canada
- Security companies based in Germany
- Security companies based in Italy
- Security companies based in Australia
- Security companies based in the Netherlands
- Security companies based in Mexico
- Security companies based in South Africa
- Security companies based in Spain
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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.