Company lists · Data refreshed September 2026
Top 23 IT security companies based in Denver, United States
RevenueBase identified 48 IT security companies headquartered in Denver, United States as of September 2026 and tracks 886 professional contacts across them, including 518 with verified work emails. New York is the largest hub.
This list covers IT security companies headquartered in Denver, 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 Denver, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 402 | ||||
“Red Canary stops cyber threats no one else does, so organizations can fearlessly pursue their missions.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 2 | TODYLIndirect evidence | 134 | |||
“Our platform empowers businesses with comprehensive cybersecurity delivered through a single-agent platform.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 112 | ||||
“DirectDefense provides enterprise risk assessments, penetration testing, ICS/SCADA security services, and 24/7 managed security services for companies of all sizes.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 4 | 48 | ||||
“Accuvant is a leading provider of information security services and solutions serving enterprise-class organizations across North America.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 5 | 19 | ||||
“Cyber Sainik protects organizations from contemporary, sophisticated threats by delivering enterprise-level tools, methods, procedures, and profound expertise, alongside…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | 18 | ||||
“Alchemy Security is a boutique cybersecurity firm dedicated to giving organizations a Defender's Advantage through a suite of innovative products and services.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 7 | 13 | ||||
“Point Solutions Security was born from a belief that anything is possible when you step outside your comfort zone and push boundaries.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | Redbot SecurityPartial evidence | 7 | |||
“Securing Critical Data and Systems.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | Teamlogic IT Of West DenverPartial evidence | 7 | |||
“How do you feel about your organization's IT and cybersecurity?” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 10 | Lost Rabbit LabsPartial evidence | 5 | |||
“Lost Rabbit Labs offers in-depth and comprehensive security assessments tailored specifically to meet any clients security needs.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | 4 | ||||
“DevilDog specializes in making cybersecurity easy with complete customized security solutions from start to finish.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 12 | Thunder Rock TechnologiesIndirect evidence | 4 | |||
“Thunder Rock is a technology company that is dedicated to making sure your business can function optimally and efficiently while reducing waste.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 13 | LibertyidIndirect evidence | 4 | |||
“Why LibertyID?” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 14 | 4 | ||||
“At Cypress Data Defense, our goal is to help organizations secure their IT and Application Development Operations using a pragmatic, risk-based approach.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 15 | Galileo Systems GroupIndirect evidence | 3 | |||
“Galileo Systems Group is a premiere technology solutions provider (TSP) focusing on small to medium sized businesses (SMBs).” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 16 | 3 | ||||
“At Brush Cyber, we understand that in today's digital landscape, cybersecurity isn't just an afterthought-it's a strategic imperative.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | 3 | ||||
Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 18 | Security Pursuit, LLCPartial evidence | 3 | |||
“Security Pursuit provides computer security services to help organizations protect their business-critical information systems.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 19 | RockcyberPartial evidence | 2 | |||
“RockCyber, a premier cybersecurity firm, is laser-focused on providing cutting-edge security services that protect businesses from dynamic cyber threats.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 20 | ZEN Technology SolutionsPartial evidence | 2 | |||
“Delivering full service small business IT support and protecting Colorado small businesses from malware and cyber-related risk.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | Whiteorc Systems, INCPartial evidence | 2 | |||
“Cyber Security has become an ongoing battle to defend against an ever-evolving group of adversaries & threat actors, in a world increasingly dependent on information and…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 22 | 2 | ||||
“Artifice Security simulates real-world cyberattacks on your network, applications, infrastructure, and personnel to uncover hidden security risks and deliver clear, actionable…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 23 | KI Security And Compliance GroupPartial evidence | 1 | |||
“For over twenty years, one of Ki Security and Compliance Group’s primary focuses has been combating ever expanding threats on enterprise networks and across the internet.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 23 of 48 IT security companies based in Denver, United States
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IT security companies based in Denver, 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 Denver, over 48 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 Denver, 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 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, 518 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 Denver, United States?
RevenueBase identified 48 IT security companies headquartered in Denver, 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?
RED Canary, A Zscaler Company, headquartered in Denver, 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 518 verified decision-maker contacts tracked across these 48 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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