Company lists · Data refreshed September 2026
Top 21 IT security companies based in Dallas, United States
RevenueBase identified 80 IT security companies headquartered in Dallas, United States as of September 2026 and tracks 1,097 professional contacts across them, including 266 with verified work emails. New York is the largest hub.
This list covers IT security companies headquartered in Dallas, 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 21 largest IT security companies based in Dallas, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | At&t CybersecurityPartial evidence | 158 | |||
“AT & T Cybersecurity’s Edge-to-Edge technologies provide phenomenal threat intelligence, collaborative defense, security without the seams, and solutions that fit your business.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 2 | 69 | ||||
“Zyston is a next‑generation cybersecurity partner dedicated to helping organizations stay one step ahead of threats.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 63 | ||||
“Apollo Information Systems delivers intelligence-led cybersecurity solutions for government agencies, educational institutions, and enterprises.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 4 | 52 | ||||
“OakTruss Group is an advisory firm focused on helping organizations operate securely at the intersection of cybersecurity, AI, and data.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 5 | 32 | ||||
“With a vision to become one of the foremost leaders, partner and trailblazer in the cyber security industry, Miller Jones Inc, features a rich portfolio of information security…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | Mainwins INCPartial evidence | 30 | |||
“Mainwins Inc- Empowering Your Business Through Comprehensive IT Solutions Company Overview: Mainwins Inc.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 7 | 16 | ||||
“At Upstart Cyber, we bring the expertise gained from government and large-scale businesses to organizations of all sizes.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | Progressive IT SolutionsPartial evidence | 10 | |||
“We are like an “easy button” for your IT Department!” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | Phoenix IT Advisors LLCPartial evidence | 7 | |||
“Did you know that the IT Industry is completely unregulated?” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 10 | 6 | ||||
“We are security engineers with over 20 years of experience working in the DFW Metroplex.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | Logos SystemsPartial evidence | 6 | |||
“At Logos Systems we are a security and vCISO services provider.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 12 | TTR TechnologyStrong evidence | 6 | |||
“TTR Technology Provides Complete Managed IT support and Cyber Security Solution to businesses Nationwide, our Mission is to efficiently manage, monitor, and optimize IT…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 13 | 4 | ||||
“ASI Security Partners, a leading network and internet security company, delivers a comprehensive set of best-of-breed solutions that help customers protect their critical…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 14 | 4 | ||||
“Birch Cline is a Dallas, Texas-based cybersecurity firm that specializes in protecting highly regulated environments and government agencies.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 15 | 4 | ||||
“Welcome to Strafe, where cybersecurity steps up to combat emerging threats.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 16 | 3 | ||||
“Method is here to assist its clients in protecting their vital information from the plethora of cyber-attacks occurring within all business segments.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | 3 | ||||
“Jemurai is a small security company built around developers that specialize in security.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 18 | 3 | ||||
“With decades of combined experience in system and application architecture, Black Arc Security's team of veteran certified security experts can quickly evaluate and mitigate risks…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 19 | 2 | ||||
“Dallas-based firm delivering strategic cybersecurity solutions that close critical security gaps and enable business growth.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 20 | Cyber Defense LabsPartial evidence | 2 | |||
“Cyber Defense Labs is a full life-cycle information security service provider helping companies manage, detect and respond to today’s cyber risks.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | 2 | ||||
“For nearly 20 years, Hawk Network Defense has helped organizations detect threats, reduce exposure, and respond to security incidents faster.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 21 of 80 IT security companies based in Dallas, United States
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IT security companies based in Dallas, 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 Dallas, over 80 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 Dallas, 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 Dallas 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, 266 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 Dallas, United States?
RevenueBase identified 80 IT security companies headquartered in Dallas, 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?
At&t Cybersecurity, headquartered in Dallas, 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 266 verified decision-maker contacts tracked across these 80 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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