Company lists · Data refreshed September 2026
Top 10 IT security managed services based in Hong Kong
RevenueBase identified 25 IT security managed services headquartered in Hong Kong as of September 2026 and tracks 186 professional contacts across them, including 79 with verified work emails. Hong Kong is the largest hub.
This list covers IT security managed services headquartered in Hong Kong, 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.
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 10 largest IT security managed services based in Hong Kong
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 30 contacts → | ||||
Strong evidence “Who is Function One?== Function One International Limited, established in provides a wide range of IT related services from its group member companies, including IT Managed…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 29 contacts → | ||||
Partial evidence “Founded by a group of devoted IT veterans from Hong Kong and Asia, the outstanding track record of our founders includes a number of winning projects with various public and…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 22 contacts → | ||||
Partial evidence “MXC Security deliver the best possible information security experience and advice to protect our client’s business and information.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 22 contacts → | ||||
Indirect evidence “Green Radar is a next generation cybersecurity company which combines technologies and services together to deliver- Threat Detection for Emails - Deep Threat Analytics and…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 11 contacts → | ||||
Indirect evidence “ESH is the cybersecurity services arm of a leading cybersecurity company in Hong Kong - Edvance International Holdings Limited (Stock code: 1410.HK) and is formed from edvance’s…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 6 contacts → | ||||
Strong evidence “Century Technology & Consultant Limited is an award-winning IT solutions firm that specializes in IT equipment, Managed Services, cybersecurity services and strategic IT…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 4 contacts → | ||||
Indirect evidence “We are a young and energetic cybersecurity consulting firm, aiming to universalize easily-adoptable cybersecurity service for all small and medium-sized enterprises in the Greater…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 2 contacts → | ||||
Strong evidence “Accurate IT provides a range of Information / Cyber Security and IT Services for small to medium sized businesses.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 2 contacts → | ||||
Strong evidence “AdvisseTeq, based in Hong Kong, specializes in providing tailored managed IT services, designed to enhance the efficiency, reliability, and security of your business's technology…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 2 contacts → | ||||
Strong evidence “HK Base IT Managed Security Services Provider” 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: IT security managed services. 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 IT security managed services.
- Partial evidence
- Its own public description names part of IT security managed services, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name IT security managed services. 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 10 of 25 IT security managed services based in Hong Kong
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IT security managed services based in Hong Kong at a glance
As of Sep 21, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for Hong Kong, so it is reported there. Company counts and contact totals on this page are exact for Hong Kong, over 25 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 managed services, 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.
- What qualifies
- Companies headquartered in Hong Kong whose own description of what they do matches “IT security managed services”. 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 IT security managed services), 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 IT security managed services, and records with no verified work email. Companies headquartered outside Hong Kong 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 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, 79 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.
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 IT security managed services, 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 IT security managed services are there based in Hong Kong?
RevenueBase identified 25 IT security managed services headquartered in Hong Kong 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?
Function ONE Computer Services, headquartered in Hong Kong, tops this list with the largest team on record.
Which city has the most IT security managed services?
Hong Kong leads with 10 headquartered companies, followed by Hong (3) and Kowloon (2).
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 79 verified decision-maker contacts tracked across these 25 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.
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