Company lists · Data refreshed September 2026
Top 25 Managed IT security services providers worldwide
RevenueBase identified 19,751 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 managed IT security services providers worldwide, 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 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 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 25 largest managed IT security services providers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 12,771 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 4,925 contacts → | ||||
Indirect evidence “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 4,328 contacts → | ||||
Partial evidence “CMS IT is a leading India-focused, tier-1 preferred IT provider with a legacy of four decades.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 3,145 contacts → | ||||
Indirect evidence “Every year new technologies, vendors, and solutions emerge-yet despite this constant innovation, high-profile breaches are all over the headlines.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 3,058 contacts → | ||||
Strong evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 2,222 contacts → | ||||
Indirect evidence “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,906 contacts → | ||||
Strong evidence “Established in 1995, GURU is an IT managed service provider that specializes in infrastructure support, systems integration, data architecture, data hosting, and cloud services.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,749 contacts → | ||||
Partial evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,519 contacts → | ||||
Indirect evidence “Société d'infogérance” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,372 contacts → | ||||
Indirect evidence “We are Architects of Change™.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 1,232 contacts → | ||||
Partial evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,181 contacts → | ||||
Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,059 contacts → | ||||
Indirect evidence “WatchGuard® Technologies, Inc.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1,037 contacts → | ||||
Partial evidence “Synoptek is a leading global managed services provider and technology consulting firm that delivers transformative business results.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 904 contacts → | ||||
Indirect evidence “ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 888 contacts → | ||||
Indirect evidence “Ensign InfoSecurity is the largest pure-play end-to-end cybersecurity service provider in Asia.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 874 contacts → | ||||
Indirect evidence “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 844 contacts → | ||||
Indirect evidence “Today’s threatscape is relentless.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 764 contacts → | ||||
Partial evidence “MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 763 contacts → | ||||
Strong evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 753 contacts → | ||||
Strong evidence “Claranet Portugal is the Portuguese market leader in Information Technologies and a specialist in Cloud, Workplace, Applications, Data & AI and Security solutions and managed…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 751 contacts → | ||||
Indirect evidence “TPx is the reliable sidekick every growing business deserves, powering your tech while you take the lead.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 731 contacts → | ||||
Partial evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 696 contacts → | ||||
Indirect evidence “Protect Your Endpoints, Identities, Logs, and Employees.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 692 contacts → | ||||
Indirect evidence “Identity Excellence Delivered.” Source: RevenueBase Database · checked Sep 21, 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: managed IT security services providers. 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 managed IT security services providers.
- Partial evidence
- Its own public description names part of managed IT security services providers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name managed IT security services providers. 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 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, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 IT security services providers, 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.
- Coverage
- Every country. Country and city lists for managed IT security services providers are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “managed IT security services providers”. 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 managed IT security services providers), 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 managed IT security services providers, and records with no verified work email.
- 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, 99,623 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 21, 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 IT security services providers by location
101 lists · largest firstEvery 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
- Managed IT security services providers based in the United States6,736
- Managed IT security services providers based in the United Kingdom1,458
- Managed IT security services providers based in India1,157
- Managed IT security services providers based in Canada889
- Managed IT security services providers based in Australia820
- Managed IT security services providers based in Brazil599
- Managed IT security services providers based in Germany596
- Managed IT security services providers based in France541
- Managed IT security services providers based in South Africa268
- Managed IT security services providers based in the Netherlands267
- Managed IT security services providers based in the United Arab Emirates243
- Managed IT security services providers based in Italy228
- Managed IT security services providers based in Spain219
- Managed IT security services providers based in Mexico163
- Managed IT security services providers based in Belgium138
- Managed IT security services providers based in Switzerland134
- Managed IT security services providers based in Türkiye126
- Managed IT security services providers based in Pakistan125
- Managed IT security services providers based in Israel118
- Managed IT security services providers based in Poland112
- Managed IT security services providers based in Ireland96
- Managed IT security services providers based in New Zealand95
- Managed IT security services providers based in Singapore91
- Managed IT security services providers based in Saudi Arabia88
- Managed IT security services providers based in Colombia86
- Managed IT security services providers based in Sweden85
- Managed IT security services providers based in Indonesia84
- Managed IT security services providers based in Nigeria76
- Managed IT security services providers based in Argentina75
- Managed IT security services providers based in Chile70
- Managed IT security services providers based in Malaysia70
- Managed IT security services providers based in Austria69
- Managed IT security services providers based in Romania63
- Managed IT security services providers based in Kenya54
- Managed IT security services providers based in the Philippines48
- Managed IT security services providers based in Portugal45
- Managed IT security services providers based in Egypt44
- Managed IT security services providers based in Denmark43
- Managed IT security services providers based in Greece42
- Managed IT security services providers based in Sri Lanka35
- Managed IT security services providers based in Hungary31
- Managed IT security services providers based in Finland29
- Managed IT security services providers based in Thailand29
- Managed IT security services providers based in Cyprus28
- Managed IT security services providers based in Peru28
- Managed IT security services providers based in Slovakia26
- Managed IT security services providers based in Ukraine26
Cities
- Managed IT security services providers based in New York, United States198
- Managed IT security services providers based in Toronto, Canada171
- Managed IT security services providers based in Sao Paulo, Brazil166
- Managed IT security services providers based in Houston, United States147
- Managed IT security services providers based in Melbourne, Australia120
- Managed IT security services providers based in Sydney, Australia111
- Managed IT security services providers based in Miami, United States96
- Managed IT security services providers based in Austin, United States95
- Managed IT security services providers based in Pune, India95
- Managed IT security services providers based in Hyderabad, India91
- Managed IT security services providers based in Dallas, United States89
- Managed IT security services providers based in New Delhi, India88
- Managed IT security services providers based in Atlanta, United States85
- Managed IT security services providers based in Chicago, United States81
- Managed IT security services providers based in Tampa, United States79
- Managed IT security services providers based in Calgary, Canada77
- Managed IT security services providers based in Bangalore, India76
- Managed IT security services providers based in Bengaluru, India65
- Managed IT security services providers based in Mumbai, India65
- Managed IT security services providers based in Montreal, Canada63
- Managed IT security services providers based in Chennai, India61
- Managed IT security services providers based in Los Angeles, United States61
- Managed IT security services providers based in Charlotte, United States58
- Managed IT security services providers based in Phoenix, United States57
- Managed IT security services providers based in Ahmedabad, India53
- Managed IT security services providers based in Noida, India52
- Managed IT security services providers based in San Diego, United States52
- Managed IT security services providers based in San Francisco, United States52
- Managed IT security services providers based in Washington, United States52
- Managed IT security services providers based in Ottawa, Canada51
- Managed IT security services providers based in Las Vegas, United States49
- Managed IT security services providers based in Denver, United States48
- Managed IT security services providers based in Irvine, United States48
- Managed IT security services providers based in San Antonio, United States43
- Managed IT security services providers based in Rio De Janeiro, Brazil42
- Managed IT security services providers based in Brisbane, Australia39
- Managed IT security services providers based in Mississauga, Canada37
- Managed IT security services providers based in Columbia, United States35
- Managed IT security services providers based in Vancouver, Canada35
- Managed IT security services providers based in Wilmington, United States35
- Managed IT security services providers based in Boston, United States34
- Managed IT security services providers based in Alexandria, United States32
- Managed IT security services providers based in Orlando, United States32
- Managed IT security services providers based in Portland, United States32
- Managed IT security services providers based in Scottsdale, United States32
- Managed IT security services providers based in Delhi, India31
- Managed IT security services providers based in Edmonton, Canada29
- Managed IT security services providers based in Plano, United States29
- Managed IT security services providers based in Arlington, United States28
- Managed IT security services providers based in San Jose, United States28
- Managed IT security services providers based in Belo Horizonte, Brazil26
- Managed IT security services providers based in Fort Lauderdale, United States26
- Managed IT security services providers based in Cincinnati, United States25
- Managed IT security services providers based in Seattle, United States25
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 managed IT security services providers, 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 managed IT security services providers are there worldwide?
RevenueBase identified 19,751 managed IT security services providers worldwide 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?
Private Sector, headquartered in Worldwide, tops this list with the largest team on record.
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 headquartered companies, 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 the top results, verified emails and direct dials included. Upgrading unlocks all 99,623 verified decision-maker contacts tracked across these 19,751 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 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 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.