Company lists · Data refreshed September 2026
Top 16 Network security testing firms based in Denver, United States
RevenueBase identified 26 network security testing firms headquartered in Denver, United States as of September 2026 and tracks 212 professional contacts across them, including 124 with verified work emails. Across the United States, New York is the largest hub for this category (79 companies); Denver has 26.
This list covers network security testing firms 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 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 16 largest network security testing firms based in Denver, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 111 contacts → | ||||
Strong evidence “DirectDefense provides enterprise risk assessments, penetration testing, ICS/SCADA security services, and 24/7 managed security services for companies of all sizes.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 13 contacts → | ||||
Partial evidence “Point Solutions Security was born from a belief that anything is possible when you step outside your comfort zone and push boundaries.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 7 contacts → | ||||
Partial evidence “Securing Critical Data and Systems.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 5 contacts → | ||||
Partial evidence “Colorado Cyber Security Consulting Firm We cater our consultative services to companies that want to verify the effectiveness of their information system security measures.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 5 contacts → | ||||
Partial evidence “DevilDog specializes in making cybersecurity easy with complete customized security solutions from start to finish.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 5 contacts → | ||||
Partial evidence “Lost Rabbit Labs offers in-depth and comprehensive security assessments tailored specifically to meet any clients security needs.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 4 contacts → | ||||
Partial evidence “Culture of Awareness Security is more than the sum of its parts Some MSP’s work hard with the technical: Firewalls, patches, anti-virus, web filtering, Zero Trust, SEIM…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 4 contacts → | ||||
Partial evidence “TechnologyWest is a Colorado-based IT services provider delivering cybersecurity solutions, managed IT services, cloud infrastructure, networking, unified communications, and…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 3 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 3 contacts → | ||||
Indirect evidence “At Brush Cyber, we understand that in today's digital landscape, cybersecurity isn't just an afterthought-it's a strategic imperative.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 3 contacts → | ||||
Partial evidence “RockCyber, a premier cybersecurity firm, is laser-focused on providing cutting-edge security services that protect businesses from dynamic cyber threats.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 3 contacts → | ||||
Partial evidence “Security Pursuit provides computer security services to help organizations protect their business-critical information systems.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 2 contacts → | ||||
Partial evidence “SpyderSec is an information security consulting organization with a straightforward mission: To enhance the security posture of our clients.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 2 contacts → | ||||
Indirect evidence “Delivering full service small business IT support and protecting Colorado small businesses from malware and cyber-related risk.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 2 contacts → | ||||
Strong evidence “Artifice Security simulates real-world cyberattacks on your network, applications, infrastructure, and personnel to uncover hidden security risks and deliver clear, actionable…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 1 contacts → | ||||
Strong evidence “Welcome to Darkthorn Security, the leading provider of cutting-edge penetration testing services fortified by the Threat Intelligence Driven Engagement (TIDE) methodology.” Source: RevenueBase Database · checked Sep 29, 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: network security testing firms. 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 network security testing firms.
- Partial evidence
- Its own public description names part of network security testing firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name network security testing firms. 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 16 of 26 network security testing firms based in Denver, United States
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Network security testing firms based in Denver, United States at a glance
As of Sep 29, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Denver, so it is reported there. Company counts and contact totals on this page are exact for Denver, over 26 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 network security testing firms, 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 Denver, United States whose own description of what they do matches “network security testing firms”. 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 network security testing firms), 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 network security testing firms, 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 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, 124 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 29, 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.
Network security testing firms by metro in the United States
- Network security testing firms in New York79
- Network security testing firms in Austin52
- Network security testing firms in San Francisco52
- Network security testing firms in Atlanta49
- Network security testing firms in Miami44
- Network security testing firms in Chicago43
- Network security testing firms in Dallas41
- Network security testing firms in Washington40
- Network security testing firms in Houston39
- Network security testing firms in Tampa33
- Network security testing firms in Arlington28
- Network security testing firms in Los Angeles28
- Network security testing firms in San Diego27
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 network security testing firms, 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 network security testing firms are there based in Denver, United States?
RevenueBase identified 26 network security testing firms 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?
Directdefense, headquartered in Denver, tops this list with the largest team on record.
Which city in the United States has the most network security testing firms?
New York leads the United States with 79 headquartered companies, followed by Austin (52) and San Francisco (52). Denver has 26.
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 124 verified decision-maker contacts tracked across these 26 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 29, 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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