Company lists · Data refreshed November 2026

Top 25 Managed security service providers based in the United States

Name: Managed security service providers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 5, 2026 3,939 companies tracked

RevenueBase identified 3,939 company matches for managed security service providers associated with the United States as of November 2026 and tracks 81,489 professional contacts across them, including 30,186 with verified work emails. New York is the largest hub.

This list covers company matches for managed security service providers associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 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 RevenueBase SmartSearch · Exact Recorded Nov 5, 2026 How this list was built

3,939Companies

81,489Contacts tracked

30,186Verified emails

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The 25 largest managed security service providers based in the United States

Ranked by team size

Top 25 of 3,939 company matches for managed security service providers based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 5, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Symantec	Exact match	San Jose, CA, United StatesHQ recorded Nov 5, 2026	10001+	11,878 contacts →
	Exact match “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2	OPTIV	Exact match	Leawood, KS, United StatesHQ recorded Nov 5, 2026	1,001-5,000	2,171 contacts →
	Exact match “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
3	Guidepoint Security	Exact match	Reston, VA, United StatesHQ recorded Nov 5, 2026	1,001-5,000	1,346 contacts →
	Exact match “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4	Watchguard Technologies	Exact match	Seattle, WA, United StatesHQ recorded Nov 5, 2026	1,001-5,000	1,174 contacts →
	Exact match “WatchGuard® Technologies, Inc.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
5	Cyderes	Exact match	Kansas City, MO, United StatesHQ recorded Nov 5, 2026	1,001-5,000	909 contacts →
	Exact match “Cyderes is a global managed cybersecurity services partner dedicated to defending against today’s relentless threatscape.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6	Zerofox	Exact match	Baltimore, VA, United StatesHQ recorded Nov 5, 2026	501-1,000	905 contacts →
	Exact match “ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7	Netenrich	Exact match	San Jose, CA, United StatesHQ recorded Nov 5, 2026	501-1,000	883 contacts →
	Exact match “Netenrich is redefining security operations by shifting the focus from "efficiency"(speed) to "efficacy"(comprehensive coverage).” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8	Huntress	Exact match	Columbia, MD, United StatesHQ recorded Nov 5, 2026	501-1,000	831 contacts →
	Exact match “Protect Your Endpoints, Identities, Logs, and Employees.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9	Levelblue	Exact match	Dallas, TX, United StatesHQ recorded Nov 5, 2026	1,001-5,000	829 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10	Bitsight	Exact match	Boston, MA, United StatesHQ recorded Nov 5, 2026	501-1,000	748 contacts →
	Exact match “Bitsight is the global leader in cyber risk intelligence, leveraging advanced AI to empower organizations with precise insights derived from the industry’s most extensive external…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11	Telos Corporation	Exact match	Ashburn, VA, United StatesHQ recorded Nov 5, 2026	501-1,000	676 contacts →
	Exact match “Telos Corporation (NASDAQ: TLS) empowers and protects the world’s most security-conscious organizations with efficient, adaptable, and secure solutions that safeguard people…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12	Bluevoyant	Exact match	New York, NY, United StatesHQ recorded Nov 5, 2026	501-1,000	668 contacts →
	Exact match “BlueVoyant’s Cyber Defense Platform (CDP) integrates MDR, TPRM, and DRP into a seamless, scalable solution.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13	Vikingcloud	Exact match	Chicago, IL, United StatesHQ recorded Nov 5, 2026	1,001-5,000	665 contacts →
	Exact match “VikingCloud delivers cybersecurity and compliance solutions that simply work.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14	Network Intelligence	Exact match	Plano, TX, United StatesHQ recorded Nov 5, 2026	501-1,000	658 contacts →
	Exact match “At Network Intelligence, we combine our team of 500+ security professionals with Transilience – our cutting-edge AI platform.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15	Ultraviolet Cyber	Exact match	Mclean, AZ, United StatesHQ recorded Nov 5, 2026	501-1,000	623 contacts →
	Exact match “UltraViolet Cyber is the only security operations partner that unifies red, blue, and purple team capabilities into one integrated program, finding what's vulnerable, stopping…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16	NIC	Exact match	Los Angeles, CA, United StatesHQ recorded Nov 5, 2026	n/a	596 contacts →
	Exact match “NIC has been providing IT Solutions, Cybersecurity, and Cloud Services for businesses and organizations for the past two decades.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17	Palo Alto Networks Unit 42	Exact match	Santa Clara, CA, United StatesHQ recorded Nov 5, 2026	5,001-10,000	510 contacts →
	Exact match “Palo Alto Networks Unit 42 brings together world-renowned threat researchers with an elite team of incident responders and security consultants to create an intelligence-driven…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18	Vc3	Exact match	Columbia, SC, United StatesHQ recorded Nov 5, 2026	501-1,000	501 contacts →
	Exact match “VC3 is a managed IT and cybersecurity services provider serving organizations throughout the US and Canada.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19	Meriplex	Exact match	Houston, TX, United StatesHQ recorded Nov 5, 2026	501-1,000	476 contacts →
	Exact match “If you’re a midsize enterprise with employees (i.e, an “MSE” according to Gartner), we know what you’re going through.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20	United Security, Inc. USI	Exact match	Red Bank, MD, United StatesHQ recorded Nov 5, 2026	1,001-5,000	426 contacts →
	Exact match “United Security Inc.(USI) provides personalized security solutions enhanced by advanced technology and cyber services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
21	IBN Technologies	Exact match	Miami, FL, United StatesHQ recorded Nov 5, 2026	51-200	417 contacts →
	Exact match “Welcome to IBN Technologies, LLC, Your Trusted Partner in Cybersecurity, Cloud, and Finance Solutions With 26+ years of expertise, IBN Technologies leads in delivering integrated…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22	Dyopath	Exact match	Houston, DC, United StatesHQ recorded Nov 5, 2026	501-1,000	414 contacts →
	Exact match “DYOPATH, a leading Managed Service Provider (MSP) was founded to empower organizations by delivering trusted IT solutions that are grounded in accountability resulting in…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23	Computer Solutions	Exact match	San Antonio, TX, United StatesHQ recorded Nov 5, 2026	51-200	408 contacts →
	Exact match “Computer Solutions: Trusted Managed IT Services and Cybersecurity Partner in San Antonio, Texas For more than 46 years, Computer Solutions has helped businesses, schools…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
24	Kudelski Security	Exact match	Cheseaux, TX, United StatesHQ recorded Nov 5, 2026	201-500	392 contacts →
	Exact match “Kudelski Security is a premier cybersecurity solutions provider, working with the most security-conscious organizations in Europe and across the United States.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
25	Intelligent Technical Solutions	Exact match	Las Vegas, NV, United StatesHQ recorded Nov 5, 2026	201-500	372 contacts →
	Exact match “Intelligent Technical Solutions (ITS) is a Managed Security Service Provider (MSSP) helping growing and mid-market organizations improve IT performance, strengthen cybersecurity…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “managed security service providers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 3,939 managed security service providers based in the United States

See the full list, filter by size, metro and specialty, and access 30,186 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Managed security service providers based in the United States at a glance

As of Nov 5, 2026

37.0%Verified-email coverage

20.7Average contacts per company

1-10Median size (employees)

3.3%Largest-city concentration · New York

Nov 5, 2026Page data refreshed

Companies by employee count

1-10

2,081

11-50

1,310

51-200

391

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 3,939 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with the United States whose business descriptions match “managed security service providers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 30,186 professional contacts with verified work emails across the full matched dataset. 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 November 5, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Managed security service providers by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “managed security service providers”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 3,939 company matches for managed security service providers associated with the United States as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Symantec tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most managed security service providers?

New York leads with 129 company records, followed by Atlanta (70) and Austin (68).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 30,186 professional contacts with verified work emails tracked across these 3,939 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 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.