Company lists · Data refreshed September 2026
Top 25 Enterprise security services based in the United Kingdom
RevenueBase identified 890 company matches for enterprise security services associated with the United Kingdom as of September 2026 and tracks 100,826 professional contacts across them, including 6,772 with verified work emails. London is the largest hub.
This list covers company matches for enterprise security services associated with the United Kingdom, 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.
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.
The 25 largest enterprise security services based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 79,699 contacts → | ||||
Exact match “G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 2 | 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 | 919 contacts → | ||||
Exact match “CIS Security is an independent security company equipped to help customers to solve the complex challenges in today’s digital, connected and regulated business world.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 4 | 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 | |||||
| 5 | 502 contacts → | ||||
Exact match “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 6 | 422 contacts → | ||||
Exact match “Unlike traditional security providers, we're redefining what protection means in today's world.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 7 | 326 contacts → | ||||
Exact match “Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 8 | 297 contacts → | ||||
Exact match “At Quorum Cyber, we're on a mission to help good people win.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 9 | 242 contacts → | ||||
Exact match “Obrela Security Industries is a global provider of cyber security services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 10 | 205 contacts → | ||||
Exact match “Pilgrims are a global security, risk management and service support company that identifies and manages risks for clients across all sectors, including oil & gas, telecoms…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 11 | 190 contacts → | ||||
Exact match “Intragen is a cyber security business focused on managed Identity solutions and services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 12 | 170 contacts → | ||||
Exact match “Looking after the things people care about, wherever they are’.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 13 | 168 contacts → | ||||
Exact match “Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 14 | 166 contacts → | ||||
Exact match “Trigion Security Services is the UK provider of Security Guarding and Technical Solutions for Facilicom UK.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 15 | 159 contacts → | ||||
Exact match “At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 16 | 125 contacts → | ||||
Exact match “KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 17 | 123 contacts → | ||||
Exact match “Bulletproof is now part of WorkNest Secure.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 18 | 116 contacts → | ||||
Exact match “TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 19 | 102 contacts → | ||||
Exact match “We create secure digital worlds for our customers, so you can look ahead with absolute confidence - helping you to to make a real, positive impact on the world.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 20 | 99 contacts → | ||||
Exact match “At Redline, we deliver a wide range of security solutions spanning training, quality assurance, auditing and risk management software.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 21 | 97 contacts → | ||||
Exact match “As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 22 | 87 contacts → | ||||
Exact match “Croma Security Solutions Group (CSSG) began in 1970 as a family-run business in Shirley, Southampton, known as County Locksmiths.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 23 | 86 contacts → | ||||
Exact match “CyberGuard Technologies is the security division of Wavenet.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 24 | 79 contacts → | ||||
Exact match “Control Center is trusted by the best-informed security operations around the world to provide proactive physical security management for mission-critical command and control.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 25 | 77 contacts → | ||||
Exact match “At OSL, our mission is to deliver adaptive security solutions that protect high-value, risk-prone areas by integrating innovative technologies designed to manage both aerial and…” 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 “enterprise security services”. 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 890 enterprise security services based in the United Kingdom
See the full list, filter by size, metro and specialty, and access 6,772 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Enterprise security services based in the United Kingdom at a glance
As of Sep 21, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 890 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 Kingdom whose business descriptions match “enterprise security services” 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 6,772 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.
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 “enterprise security services”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many enterprise security services are there based in the United Kingdom?
RevenueBase identified 890 company matches for enterprise security services associated with the United Kingdom 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?
G4s tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most enterprise security services?
London leads with 275 company records, followed by Manchester (24) and Birmingham (18).
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 6,772 professional contacts with verified work emails tracked across these 890 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.
Ready to reach these companies? Verified emails and direct dials for all 890 enterprise security services based in the United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Enterprise security services by geography
- Enterprise security services based in Belo Horizonte, Brazil
- Enterprise security services based in Brasilia, Brazil
- Enterprise security services based in Curitiba, Brazil
- Enterprise security services based in Rio De Janeiro, Brazil
- Enterprise security services based in Sao Paulo, Brazil
- Enterprise security services based in Calgary, Canada
- Enterprise security services based in Mississauga, Canada
- Enterprise security services based in Montreal, Canada
- Enterprise security services based in Ottawa, Canada
- Enterprise security services based in Toronto, Canada
- Enterprise security services based in Vancouver, Canada
- Enterprise security services based in Ahmedabad, India
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Enterprise security services based in Belo Horizonte, Brazil
- Enterprise security services based in Brasilia, Brazil
- Enterprise security services based in Curitiba, Brazil
- Enterprise security services based in Rio De Janeiro, Brazil
- Enterprise security services based in Sao Paulo, Brazil
- Enterprise security services based in Calgary, Canada
Company intelligence · public preview
Top 25 enterprise security services based in the United Kingdom
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 890 matching company records for enterprise security services based in the United Kingdom, with 100,826 tracked contacts and 6,772 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 21, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 enterprise security services based in the United Kingdom
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  G4sg4s.comHQ: London, United KingdomReported employees: 10001+ | London, United Kingdom | 10001+ | Exact match | 79,699 contacts → |
“G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Sophossophos.comHQ: Abingdon, United KingdomReported employees: 5,001-10,000 | Abingdon, United Kingdom | 5,001-10,000 | Exact match | 4,925 contacts → |
“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  CIS Security Limitedcis-security.co.ukHQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 919 contacts → |
“CIS Security is an independent security company equipped to help customers to solve the complex challenges in today’s digital, connected and regulated business world.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  MTImti.comHQ: Staines-upon-thames, United KingdomReported employees: 201-500 | Staines-upon-thames, United Kingdom | 201-500 | Exact match | 764 contacts → |
“MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Securityhqsecurityhq.comHQ: London, United KingdomReported employees: 501-1,000 | London, United Kingdom | 501-1,000 | Exact match | 502 contacts → |
“SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Lodge Securitylodge-security.comHQ: Cirencester, United KingdomReported employees: 1,001-5,000 | Cirencester, United Kingdom | 1,001-5,000 | Exact match | 422 contacts → |
“Unlike traditional security providers, we're redefining what protection means in today's world.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Kings Secure Technologieskingsltd.co.ukHQ: Bradford, United KingdomReported employees: 501-1,000 | Bradford, United Kingdom | 501-1,000 | Exact match | 326 contacts → |
“Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Quorum Cyberquorumcyber.comHQ: Edinburgh, United KingdomReported employees: 201-500 | Edinburgh, United Kingdom | 201-500 | Exact match | 297 contacts → |
“At Quorum Cyber, we're on a mission to help good people win.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Obrelaobrela.comHQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 242 contacts → |
“Obrela Security Industries is a global provider of cyber security services.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Pilgrims Risk Management Grouppilgrims-rmg.comHQ: Woking, United KingdomReported employees: 201-500 | Woking, United Kingdom | 201-500 | Exact match | 205 contacts → |
“Pilgrims are a global security, risk management and service support company that identifies and manages risks for clients across all sectors, including oil & gas, telecoms…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Intragenintragen.comHQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 190 contacts → |
“Intragen is a cyber security business focused on managed Identity solutions and services.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Texecom LTDtexe.comHQ: Haslingden, United KingdomReported employees: 201-500 | Haslingden, United Kingdom | 201-500 | Exact match | 170 contacts → |
“Looking after the things people care about, wherever they are’.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Sapphiresapphire.netHQ: Newcastle Upon Tyne, United KingdomReported employees: 51-200 | Newcastle Upon Tyne, United Kingdom | 51-200 | Exact match | 168 contacts → |
“Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Trigion Security Services LTDtrigion.co.ukHQ: Sidcup, United KingdomReported employees: 201-500 | Sidcup, United Kingdom | 201-500 | Exact match | 166 contacts → |
“Trigion Security Services is the UK provider of Security Guarding and Technical Solutions for Facilicom UK.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Cyberfortcyberfortgroup.comHQ: Thatcham, United KingdomReported employees: 51-200 | Thatcham, United Kingdom | 51-200 | Exact match | 159 contacts → |
“At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Khipu Networkskhipu-networks.comHQ: Fleet, United KingdomReported employees: 51-200 | Fleet, United Kingdom | 51-200 | Exact match | 125 contacts → |
“KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Bulletproof Cyber Securityworknest.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 123 contacts → |
“Bulletproof is now part of WorkNest Secure.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Total Security Protection LTDtsp.co.ukHQ: Watford, United KingdomReported employees: 51-200 | Watford, United Kingdom | 51-200 | Exact match | 116 contacts → |
“TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Celerity Limitedcelerity-uk.comHQ: Manchester, United KingdomReported employees: 51-200 | Manchester, United Kingdom | 51-200 | Exact match | 102 contacts → |
“We create secure digital worlds for our customers, so you can look ahead with absolute confidence - helping you to to make a real, positive impact on the world.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Redline Assured Securitytrustredline.co.ukHQ: Doncaster, United KingdomReported employees: 51-200 | Doncaster, United Kingdom | 51-200 | Exact match | 99 contacts → |
“At Redline, we deliver a wide range of security solutions spanning training, quality assurance, auditing and risk management software.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Caretower An Integrity360 Companyintegrity360.comHQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 97 contacts → |
“As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Croma Security Solutions Group PLC Cssgcssgplc.comHQ: Whiteley, United KingdomReported employees: 501-1,000 | Whiteley, United Kingdom | 501-1,000 | Exact match | 87 contacts → |
“Croma Security Solutions Group (CSSG) began in 1970 as a family-run business in Shirley, Southampton, known as County Locksmiths.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Wavenet Cyberguardwavenetuk.comHQ: Stourport-on-severn, United KingdomReported employees: 201-500 | Stourport-on-severn, United Kingdom | 201-500 | Exact match | 86 contacts → |
“CyberGuard Technologies is the security division of Wavenet.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  CNLcnlsoftware.comHQ: Camberley, United KingdomReported employees: 51-200 | Camberley, United Kingdom | 51-200 | Exact match | 79 contacts → |
“Control Center is trusted by the best-informed security operations around the world to provide proactive physical security management for mission-critical command and control.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  OSL Technologyosltechnology.comHQ: Reading, United KingdomReported employees: 51-200 | Reading, United Kingdom | 51-200 | Exact match | 77 contacts → |
“At OSL, our mission is to deliver adaptive security solutions that protect high-value, risk-prone areas by integrating innovative technologies designed to manage both aerial and…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 890 company matches
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Enterprise security services: dataset insights
September 21, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
888 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 890 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 21, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for enterprise security services?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many enterprise security services did RevenueBase find based in the United Kingdom?
The saved snapshot records 890 matching company records, 100,826 tracked contacts and 6,772 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 21, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Enterprise security services by geography
- Enterprise security services based in Belo Horizonte, Brazil
- Enterprise security services based in Brasilia, Brazil
- Enterprise security services based in Curitiba, Brazil
- Enterprise security services based in Rio De Janeiro, Brazil
- Enterprise security services based in Sao Paulo, Brazil
- Enterprise security services based in Calgary, Canada
- Enterprise security services based in Mississauga, Canada
- Enterprise security services based in Montreal, Canada
- Enterprise security services based in Ottawa, Canada
- Enterprise security services based in Toronto, Canada
- Enterprise security services based in Vancouver, Canada
- Enterprise security services based in Ahmedabad, India
Cite this list
RevenueBase Data Team. Top 25 enterprise security services based in the United Kingdom. Snapshot: September 21, 2026. https://revenuebase.ai/companies/enterprise-security-services/united-kingdom.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Enterprise security services based in Belo Horizonte, Brazil
- Enterprise security services based in Brasilia, Brazil
- Enterprise security services based in Curitiba, Brazil
- Enterprise security services based in Rio De Janeiro, Brazil
- Enterprise security services based in Sao Paulo, Brazil
- Enterprise security services based in Calgary, Canada
Company intelligence · public preview
Top 25 enterprise security services based in the United Kingdom
RevenueBase records 890 matching company records for enterprise security services based in the United Kingdom, with 100,826 tracked contacts and 6,772 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 21, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 enterprise security services based in the United Kingdom
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | G4sg4s.com HQ: London, United KingdomReported employees: 10001+ | London, United Kingdom | 10001+ | Exact match | 79,699 contacts → |
“G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Sophossophos.com HQ: Abingdon, United KingdomReported employees: 5,001-10,000 | Abingdon, United Kingdom | 5,001-10,000 | Exact match | 4,925 contacts → |
“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | CIS Security Limitedcis-security.co.uk HQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 919 contacts → |
“CIS Security is an independent security company equipped to help customers to solve the complex challenges in today’s digital, connected and regulated business world.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | MTImti.com HQ: Staines-upon-thames, United KingdomReported employees: 201-500 | Staines-upon-thames, United Kingdom | 201-500 | Exact match | 764 contacts → |
“MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Securityhqsecurityhq.com HQ: London, United KingdomReported employees: 501-1,000 | London, United Kingdom | 501-1,000 | Exact match | 502 contacts → |
“SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Lodge Securitylodge-security.com HQ: Cirencester, United KingdomReported employees: 1,001-5,000 | Cirencester, United Kingdom | 1,001-5,000 | Exact match | 422 contacts → |
“Unlike traditional security providers, we're redefining what protection means in today's world.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Kings Secure Technologieskingsltd.co.uk HQ: Bradford, United KingdomReported employees: 501-1,000 | Bradford, United Kingdom | 501-1,000 | Exact match | 326 contacts → |
“Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Quorum Cyberquorumcyber.com HQ: Edinburgh, United KingdomReported employees: 201-500 | Edinburgh, United Kingdom | 201-500 | Exact match | 297 contacts → |
“At Quorum Cyber, we're on a mission to help good people win.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Obrelaobrela.com HQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 242 contacts → |
“Obrela Security Industries is a global provider of cyber security services.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Pilgrims Risk Management Grouppilgrims-rmg.com HQ: Woking, United KingdomReported employees: 201-500 | Woking, United Kingdom | 201-500 | Exact match | 205 contacts → |
“Pilgrims are a global security, risk management and service support company that identifies and manages risks for clients across all sectors, including oil & gas, telecoms…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Intragenintragen.com HQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 190 contacts → |
“Intragen is a cyber security business focused on managed Identity solutions and services.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Texecom LTDtexe.com HQ: Haslingden, United KingdomReported employees: 201-500 | Haslingden, United Kingdom | 201-500 | Exact match | 170 contacts → |
“Looking after the things people care about, wherever they are’.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Sapphiresapphire.net HQ: Newcastle Upon Tyne, United KingdomReported employees: 51-200 | Newcastle Upon Tyne, United Kingdom | 51-200 | Exact match | 168 contacts → |
“Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Trigion Security Services LTDtrigion.co.uk HQ: Sidcup, United KingdomReported employees: 201-500 | Sidcup, United Kingdom | 201-500 | Exact match | 166 contacts → |
“Trigion Security Services is the UK provider of Security Guarding and Technical Solutions for Facilicom UK.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Cyberfortcyberfortgroup.com HQ: Thatcham, United KingdomReported employees: 51-200 | Thatcham, United Kingdom | 51-200 | Exact match | 159 contacts → |
“At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Khipu Networkskhipu-networks.com HQ: Fleet, United KingdomReported employees: 51-200 | Fleet, United Kingdom | 51-200 | Exact match | 125 contacts → |
“KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Bulletproof Cyber Securityworknest.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 123 contacts → |
“Bulletproof is now part of WorkNest Secure.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Total Security Protection LTDtsp.co.uk HQ: Watford, United KingdomReported employees: 51-200 | Watford, United Kingdom | 51-200 | Exact match | 116 contacts → |
“TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Celerity Limitedcelerity-uk.com HQ: Manchester, United KingdomReported employees: 51-200 | Manchester, United Kingdom | 51-200 | Exact match | 102 contacts → |
“We create secure digital worlds for our customers, so you can look ahead with absolute confidence - helping you to to make a real, positive impact on the world.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Redline Assured Securitytrustredline.co.uk HQ: Doncaster, United KingdomReported employees: 51-200 | Doncaster, United Kingdom | 51-200 | Exact match | 99 contacts → |
“At Redline, we deliver a wide range of security solutions spanning training, quality assurance, auditing and risk management software.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Caretower An Integrity360 Companyintegrity360.com HQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 97 contacts → |
“As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Croma Security Solutions Group PLC Cssgcssgplc.com HQ: Whiteley, United KingdomReported employees: 501-1,000 | Whiteley, United Kingdom | 501-1,000 | Exact match | 87 contacts → |
“Croma Security Solutions Group (CSSG) began in 1970 as a family-run business in Shirley, Southampton, known as County Locksmiths.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Wavenet Cyberguardwavenetuk.com HQ: Stourport-on-severn, United KingdomReported employees: 201-500 | Stourport-on-severn, United Kingdom | 201-500 | Exact match | 86 contacts → |
“CyberGuard Technologies is the security division of Wavenet.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | CNLcnlsoftware.com HQ: Camberley, United KingdomReported employees: 51-200 | Camberley, United Kingdom | 51-200 | Exact match | 79 contacts → |
“Control Center is trusted by the best-informed security operations around the world to provide proactive physical security management for mission-critical command and control.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | OSL Technologyosltechnology.com HQ: Reading, United KingdomReported employees: 51-200 | Reading, United Kingdom | 51-200 | Exact match | 77 contacts → |
“At OSL, our mission is to deliver adaptive security solutions that protect high-value, risk-prone areas by integrating innovative technologies designed to manage both aerial and…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Enterprise security services: dataset insights
September 21, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
888 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 890 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 21, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for enterprise security services?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many enterprise security services did RevenueBase find based in the United Kingdom?
The saved snapshot records 890 matching company records, 100,826 tracked contacts and 6,772 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 21, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
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Cite this list
RevenueBase Data Team. Top 25 enterprise security services based in the United Kingdom. Snapshot: September 21, 2026. https://revenuebase.ai/companies/enterprise-security-services/united-kingdom.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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- Enterprise security services based in Belo Horizonte, Brazil
- Enterprise security services based in Brasilia, Brazil
- Enterprise security services based in Curitiba, Brazil
- Enterprise security services based in Rio De Janeiro, Brazil
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