Company lists · Data refreshed September 2026

Top 23 Managed security service providers based in Dallas, United States

RevenueBase identified 100 managed security service providers headquartered in Dallas, United States as of September 2026 and tracks 1,631 professional contacts across them, including 659 with verified work emails. New York is the largest hub.

This list covers managed security service providers 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 5, 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
100Companies
1,631Contacts tracked
659Verified emails
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The 23 largest managed security service providers based in Dallas, United States

Ranked by team size
Top 23 of 100 managed security service providers based in Dallas, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names managed security service providers: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
LevelblueIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261,001-5,000594
Source: company website · checked Sep 5, 2026
2
At&t CybersecurityPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261,001-5,000156

“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 5, 2026
3
Sq1 SecurityPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 2026201-500154

“SQ1 Security is a global cybersecurity leader offering end-to-end cybersecurity and compliance solution.”

Source: company website · checked Sep 5, 2026
4
Zyston LLCIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 202651-20070

“Zyston is a next‑generation cybersecurity partner dedicated to helping organizations stay one step ahead of threats.”

Source: company website · checked Sep 5, 2026
5
Apollo Information SystemsIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 202651-20064

“Apollo Information Systems delivers intelligence-led cybersecurity solutions for government agencies, educational institutions, and enterprises.”

Source: company website · checked Sep 5, 2026
6
Oaktruss GroupIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 202651-20052

“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 5, 2026
7
SolcyberPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 202651-20025

“SolCyber, a Forgepoint company, is the first modern MSSP to deliver a curated stack of enterprise strength security tools and services that are streamlined, accessible and…”

Source: company website · checked Sep 5, 2026
8
Modo Networks, LLCPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 202611-5023

“As a Managed Service Provider (MSP), we specialize in providing top-notch IT support and solutions to small and medium-sized businesses.”

Source: company website · checked Sep 5, 2026
9
Upstart CyberIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 202611-5015

“At Upstart Cyber, we bring the expertise gained from government and large-scale businesses to organizations of all sizes.”

Source: company website · checked Sep 5, 2026
10
Progressive IT SolutionsIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261-1010

“We are like an “easy button” for your IT Department!”

Source: company website · checked Sep 5, 2026
11Dallas, TX, United StatesHQ checked Sep 5, 20261-109

“Cloudavize, established in 2019, is a trusted Managed Service Provider which provides reliable and secure IT services for small and midsize businesses in the Dallas-Fort Worth…”

Source: company website · checked Sep 5, 2026
12
Bonelli SystemsPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 202611-507

“Bonelli Systems is a dynamic Managed Services Provider (MSP) based in Dallas, TX, specializing in secure, streamlined IT solutions for small to mid-sized businesses and legal…”

Source: company website · checked Sep 5, 2026
13
Phoenix IT Advisors LLCIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 202611-507

“Did you know that the IT Industry is completely unregulated?”

Source: company website · checked Sep 5, 2026
14
Black Belt SecurePartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261-106

“We are security engineers with over 20 years of experience working in the DFW Metroplex.”

Source: company website · checked Sep 5, 2026
15
TTR TechnologyStrong evidence
Dallas, TX, United StatesHQ checked Sep 5, 202611-506

“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 5, 2026
16
Cybase Risk ManagementPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261-106

“CyBase Risk is a catalyst cyber risk management consulting firm, dedicated to empowering small and medium-sized businesses (SMBs) with insight and roadmaps to proactively protect…”

Source: company website · checked Sep 5, 2026
17
Logos SystemsPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261-105

“At Logos Systems we are a security and vCISO services provider.”

Source: company website · checked Sep 5, 2026
18
ASI Security PartnersPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261-104

“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 5, 2026
19
Birch Cline CybersecurityIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 202611-504

“Birch Cline is a Dallas, Texas-based cybersecurity firm that specializes in protecting highly regulated environments and government agencies.”

Source: company website · checked Sep 5, 2026
20
TekzysPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 202611-504

“Since 2012, TEKZYS has protected business infrastructure through security-first governance and disciplined technology oversight.”

Source: company website · checked Sep 5, 2026
21
Strafe CybersecurityIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261-104

“Welcome to Strafe, where cybersecurity steps up to combat emerging threats.”

Source: company website · checked Sep 5, 2026
22
Method Cyber SecurityIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261-103

“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 5, 2026
23
Bolt ResourcesIndirect evidence
Dallas, TX, United StatesHQ checked Sep 5, 20261-103

“At Bolt Resources, we believe cybersecurity leadership is the cornerstone of modern business resilience.”

Source: company website · checked Sep 5, 2026

Showing 23 of 100 managed security service providers based in Dallas, United States

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Managed security service providers based in Dallas, United States at a glance

As of Sep 5, 2026
1-10Median size (employees)
New YorkLargest hub · 200 HQs
Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
50
11-50
35
51-200
12
201-500
1
1,001-5,000
2

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 100 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 managed security service providers, 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 “managed security service providers”. 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 managed security service providers, 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, 659 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 5, 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.

Managed security service providers by metro in the United States

Frequently asked

How many managed security service providers are there based in Dallas, United States?

RevenueBase identified 100 managed security service providers 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?

Levelblue, headquartered in Dallas, tops this list with the largest team on record.

Which city has the most managed security service providers?

New York leads with 200 headquartered companies, followed by Houston (120) and Austin (117).

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 659 verified decision-maker contacts tracked across these 100 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 5, 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.