Company lists · Data refreshed September 2026

Top 25 Managed IT security services providers worldwide

Name: Managed IT security services providers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 19,751 companies tracked

RevenueBase identified 19,751 company matches for managed IT security services providers worldwide as of September 2026 and tracks 296,289 professional contacts across them, including 99,623 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for managed IT security services providers worldwide, 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 September 21, 2026. Country and city lists for managed IT security services providers follow the table.

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 Sep 21, 2026 How this list was built

19,751Companies

296,289Contacts tracked

99,623Verified emails

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The 25 largest managed IT security services providers worldwide

Ranked by team size

Top 25 of 19,751 company matches for managed IT security services providers worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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	Private Sector	Exact match	United StatesHQ recorded Sep 21, 2026	n/a	12,771 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	Sophos	Exact match	Abingdon, United KingdomHQ recorded Sep 21, 2026	5,001-10,000	4,925 contacts →
	Exact match “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	CMS IT Services	Exact match	Bengaluru, IndiaHQ recorded Sep 21, 2026	5,001-10,000	4,328 contacts →
	Exact match “CMS IT is a leading India-focused, tier-1 preferred IT provider with a legacy of four decades.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Arctic Wolf	Exact match	Eden Prairie, MN, United StatesHQ recorded Sep 21, 2026	1,001-5,000	3,145 contacts →
	Exact match “Every year new technologies, vendors, and solutions emerge-yet despite this constant innovation, high-profile breaches are all over the headlines.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Qualys	Exact match	Foster City, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	3,058 contacts →
	Exact match “Qualys, Inc.(NASDAQ: QLYS) is a leading provider of disruptive cloud-based security, compliance and IT solutions with more than subscription customers worldwide, including a…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	OPTIV	Exact match	Leawood, KS, United StatesHQ recorded Sep 21, 2026	1,001-5,000	2,222 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 · Sep 21, 2026 · View company records in RevenueBase
7	GURU	Exact match	Rockville, MD, United StatesHQ recorded Sep 21, 2026	n/a	1,906 contacts →
	Exact match “Established in 1995, GURU is an IT managed service provider that specializes in infrastructure support, systems integration, data architecture, data hosting, and cloud services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Eplus INC	Exact match	Herndon, VA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,749 contacts →
	Exact match “ePlus is a customer-first, services-led, results-driven and trusted industry leader that helps organizations secure, modernize, optimize, and scale every aspect of their IT…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	CMS	Exact match	Meudon La Foret, FranceHQ recorded Sep 21, 2026	n/a	1,519 contacts →
	Exact match “Société d'infogérance” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	Logicalis	Exact match	Maidenhead, United KingdomHQ recorded Sep 21, 2026	5,001-10,000	1,372 contacts →
	Exact match “We are Architects of Change™.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Guidepoint Security	Exact match	Reston, VA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,232 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 · Sep 21, 2026 · View company records in RevenueBase
12	Forescout Technologies INC	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,181 contacts →
	Exact match “As AI-driven vulnerability and exploitation accelerate attack velocity to machine speed, Forescout is a foundational cyber defense layer that allows organizations to segment and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Watchguard Technologies	Exact match	Seattle, WA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,059 contacts →
	Exact match “WatchGuard® Technologies, Inc.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Synoptek	Exact match	Costa Mesa, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,037 contacts →
	Exact match “Synoptek is a leading global managed services provider and technology consulting firm that delivers transformative business results.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Zerofox	Exact match	Baltimore, MD, United StatesHQ recorded Sep 21, 2026	501-1,000	904 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 · Sep 21, 2026 · View company records in RevenueBase
16	Ensign Infosecurity	Exact match	SingaporeHQ recorded Sep 21, 2026	501-1,000	888 contacts →
	Exact match “Ensign InfoSecurity is the largest pure-play end-to-end cybersecurity service provider in Asia.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Trustwave, A Levelblue Company	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	501-1,000	874 contacts →
	Exact match “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Cyderes	Exact match	Kansas City, MO, United StatesHQ recorded Sep 21, 2026	1,001-5,000	844 contacts →
	Exact match “Today’s threatscape is relentless.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	MTI	Exact match	Staines-upon-thames, United KingdomHQ recorded Sep 21, 2026	201-500	764 contacts →
	Exact match “MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	Softcell Technologies Global Pvt. LTD	Exact match	Mumbai, IndiaHQ recorded Sep 21, 2026	501-1,000	763 contacts →
	Exact match “With 35 years of experience, Softcell Technologies Global is a trusted IT services provider specialising in (i) IT security and cybersecurity solutions,(ii) cloud / on-premise…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Claranet Portugal	Exact match	Lisbon, PortugalHQ recorded Sep 21, 2026	1,001-5,000	753 contacts →
	Exact match “Claranet Portugal is the Portuguese market leader in Information Technologies and a specialist in Cloud, Workplace, Applications, Data & AI and Security solutions and managed…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	TPX	Exact match	Austin, TX, United StatesHQ recorded Sep 21, 2026	1,001-5,000	751 contacts →
	Exact match “TPx is the reliable sidekick every growing business deserves, powering your tech while you take the lead.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	DATTO	Exact match	Norwalk, CT, United StatesHQ recorded Sep 21, 2026	1,001-5,000	731 contacts →
	Exact match “As a leading global provider of security and cloud-based software solutions purpose-built for MSPs, Datto, a Kaseya company, believes there is no limit to what SMBs can achieve…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Huntress	Exact match	Columbia, MD, United StatesHQ recorded Sep 21, 2026	501-1,000	696 contacts →
	Exact match “Protect Your Endpoints, Identities, Logs, and Employees.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	IC Consult	Exact match	München, GermanyHQ recorded Sep 21, 2026	501-1,000	692 contacts →
	Exact match “Identity Excellence Delivered.” Recorded in the RevenueBase company graph · Sep 21, 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 IT security services 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 19,751 managed IT security services providers worldwide

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Managed IT security services providers worldwide at a glance

As of Sep 21, 2026

33.6%Verified-email coverage

15.0Average contacts per company

1-10Median size (employees)

2.1%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

10,725

11-50

6,739

51-200

1,664

201-500

363

501-1,000

114

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for managed IT security services providers are linked below.
What qualifies: Company records worldwide whose business descriptions match “managed IT security services 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. 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 99,623 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 September 21, 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 IT security services providers by location

101 lists · largest first

Every Managed IT security services providers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 IT security services providers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many managed IT security services providers are there worldwide?

RevenueBase identified 19,751 company matches for managed IT security services providers worldwide as of September 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?

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

Which country has the most managed IT security services providers?

The United States leads with 6,736 companies, followed by the United Kingdom (1,458) and India (1,157). Every managed IT security services providers list by country and city is linked on this page.

Which city has the most managed IT security services providers?

London leads with 408 company records, followed by New York (198) and Toronto (171).

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 99,623 professional contacts with verified work emails tracked across these 19,751 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 September 21, 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.