Company lists · Data refreshed November 2026
Top 25 Software development security startups based in the United Kingdom
RevenueBase identified 75 company matches for software development security startups associated with the United Kingdom as of November 2026 and tracks 1,267 professional contacts across them, including 369 with verified work emails. London is the largest hub.
This list covers company matches for software development security startups 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 November 5, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest software development security startups based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 288 contacts → | ||||
Exact match “PortSwigger is a global leader in the creation of software tools for security testing of web applications.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 2 | 65 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 3 | 63 contacts → | ||||
Exact match “We’re here to provide world-leading vulnerability research and capabilities!” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 4 | 53 contacts → | ||||
Exact match “We deliver services in Cybersecurity, Application Security and DevOps and are trusted by some of the world’s leading brands to maximise the value of their security investments and…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 5 | 46 contacts → | ||||
Exact match “CoreTech is a specialist cyber security company whose people are motivated by the desire to deliver exceptional capabilities coupled with a real sense of mission.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 6 | 45 contacts → | ||||
Exact match “DWS is a global enterprise software services company delivering development, testing, and software supply chain security solutions.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 7 | 43 contacts → | ||||
Exact match “For more than 45 years, LDRA has developed and driven the market for software that automates code analysis and software testing for safety, mission, security- and…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 8 | 38 contacts → | ||||
Exact match “Detect, enforce and measure Since 1985, PRQA has pioneered software coding governance in the automotive, aerospace, transport, finance, medical device and energy industries.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 9 | 23 contacts → | ||||
Exact match “Halo I.S is not just another cybersecurity organization based in the UK; we're a testament to evolution and client-centric innovation.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 10 | 20 contacts → | ||||
Exact match “Cytix is the security decision layer for a world where software development never stops.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 11 | 20 contacts → | ||||
Exact match “CloudSecure delivers secure software and cloud systems for security-critical environments.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 12 | 14 contacts → | ||||
Exact match “CyTAL exists to help developers, manufacturers and their customers to improve the security and resilience of products and systems.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 13 | 10 contacts → | ||||
Exact match “Meterian secures your software supply chain by detecting and fixing open source vulnerabilities before they impact your business.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 14 | 8 contacts → | ||||
Exact match “We’re a Cyber Security consultancy that specialise in DevSecOps, bringing together development and security expertise.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 15 | 7 contacts → | ||||
Exact match “Secure Debug: Your Full-Spectrum Cybersecurity Guardian!” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 16 | 6 contacts → | ||||
Exact match “Rebasoft is a UK based Software and Services company, founded in 2009 and produces software solutions for the Cyber Security market space.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 17 | 3 contacts → | ||||
Exact match “Zeroday Co, Ltd is a company focusing on developing and delivering state-of-art application security testing tools/platforms.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 18 | 3 contacts → | ||||
Exact match “Vulert is a Software Composition Analysis (SCA) platform for monitoring vulnerabilities in open-source dependencies.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 19 | 3 contacts → | ||||
Exact match “At Securityium, we're dedicated to transforming the way you experience security testing for your business.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 20 | 3 contacts → | ||||
Exact match “Datamango is the UK team to bring your software product to life-built fast, engineered for security, and ready to scale.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 21 | 2 contacts → | ||||
Exact match “Clear Loop Security is a Vulnerability Management Solution vendor and a forward-looking cyber and information security consultancy, focused on the real challenges of protecting…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 22 | 2 contacts → | ||||
Exact match “Cyber Legion is the corporate technology and engineering organisation of Cyber Legion Ltd, a UK company designing, building, securing and governing AI systems, software products…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 23 | 1 contacts → | ||||
Exact match “Darklabs is the IT security company that offers powerful testing capabilities affordably to all, allowing our clients to test more, more frequently, for less.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 24 | 1 contacts → | ||||
Exact match “IT Security & Develpment” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 25 | 1 contacts → | ||||
Exact match “At Perimeter, we turn visions into reality for both established enterprises and emerging businesses.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “software development security startups”. 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 75 software development security startups based in the United Kingdom
See the full list, filter by size, metro and specialty, and access 369 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Software development security startups based in the United Kingdom at a glance
As of Nov 5, 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 75 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 “software development security startups” 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 369 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on November 5, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Software development security startups by metro
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “software development security startups”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many software development security startups are there based in the United Kingdom?
RevenueBase identified 75 company matches for software development security startups associated with the United Kingdom as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Portswigger tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most software development security startups?
London leads with 35 company records, followed by Manchester (3) and Basingstoke (2).
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 369 professional contacts with verified work emails tracked across these 75 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 5, 2026.
Ready to reach these companies? Verified emails and direct dials for all 75 software development security startups based in the United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Software development security startups by geography
- Software development security startups based in London, United Kingdom
- Software development security startups based in San Francisco, United States
- Software development security startups based in Australia
- Software development security startups based in Brazil
- Software development security startups based in Canada
- Software development security startups based in France
- Software development security startups based in Germany
- Software development security startups based in India
- Software development security startups based in the Netherlands
- Software development security startups based in the United States
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.
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- Software development security startups based in London, United Kingdom
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- Software development security startups based in Australia
- Software development security startups based in Brazil
- Software development security startups based in Canada
- Software development security startups based in France
Company intelligence · public preview
Top 25 software development security startups 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 75 matching company records for software development security startups based in the United Kingdom, with 1,267 tracked contacts and 369 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: November 5, 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 software development security startups 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 |  Portswiggerportswigger.netHQ: Knutsford, United KingdomReported employees: 51-200 | Knutsford, United Kingdom | 51-200 | Exact match | 288 contacts → |
“PortSwigger is a global leader in the creation of software tools for security testing of web applications.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Secureflagsecureflag.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 65 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 3 |  Interrupt Labsinterruptlabs.co.ukHQ: Basingstoke, United KingdomReported employees: 51-200 | Basingstoke, United Kingdom | 51-200 | Exact match | 63 contacts → |
“We’re here to provide world-leading vulnerability research and capabilities!” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Riversaferiversafe.co.ukHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 53 contacts → |
“We deliver services in Cybersecurity, Application Security and DevOps and are trusted by some of the world’s leading brands to maximise the value of their security investments and…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Coretech Securitycoretechsec.comHQ: Cheltenham, United KingdomReported employees: 51-200 | Cheltenham, United Kingdom | 51-200 | Exact match | 46 contacts → |
“CoreTech is a specialist cyber security company whose people are motivated by the desire to deliver exceptional capabilities coupled with a real sense of mission.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  DWSdws-global.comHQ: Marlow, United KingdomReported employees: 11-50 | Marlow, United Kingdom | 11-50 | Exact match | 45 contacts → |
“DWS is a global enterprise software services company delivering development, testing, and software supply chain security solutions.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Ldra Limitedldra.comHQ: Wirral, United KingdomReported employees: 51-200 | Wirral, United Kingdom | 51-200 | Exact match | 43 contacts → |
“For more than 45 years, LDRA has developed and driven the market for software that automates code analysis and software testing for safety, mission, security- and…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  PRQAprqa.comHQ: Walton On Thames, United KingdomReported employees: 51-200 | Walton On Thames, United Kingdom | 51-200 | Exact match | 38 contacts → |
“Detect, enforce and measure Since 1985, PRQA has pioneered software coding governance in the automotive, aerospace, transport, finance, medical device and energy industries.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Halo I.Shalo-is.co.ukHQ: Leeds, United KingdomReported employees: 11-50 | Leeds, United Kingdom | 11-50 | Exact match | 23 contacts → |
“Halo I.S is not just another cybersecurity organization based in the UK; we're a testament to evolution and client-centric innovation.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  CYTIXcytix.ioHQ: Manchester, United KingdomReported employees: 11-50 | Manchester, United Kingdom | 11-50 | Exact match | 20 contacts → |
“Cytix is the security decision layer for a world where software development never stops.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Cloudsecurecloudsecure.ltdHQ: Cheltenham, United KingdomReported employees: 11-50 | Cheltenham, United Kingdom | 11-50 | Exact match | 20 contacts → |
“CloudSecure delivers secure software and cloud systems for security-critical environments.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  CYTALcytal.co.ukHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 14 contacts → |
“CyTAL exists to help developers, manufacturers and their customers to improve the security and resilience of products and systems.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Meterianmeterian.ioHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 10 contacts → |
“Meterian secures your software supply chain by detecting and fixing open source vulnerabilities before they impact your business.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Punk Securitypunksecurity.co.ukHQ: Northallerton, United KingdomReported employees: 11-50 | Northallerton, United Kingdom | 11-50 | Exact match | 8 contacts → |
“We’re a Cyber Security consultancy that specialise in DevSecOps, bringing together development and security expertise.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Secure Debugsecuredebug.comHQ: Cranfield, United KingdomReported employees: 11-50 | Cranfield, United Kingdom | 11-50 | Exact match | 7 contacts → |
“Secure Debug: Your Full-Spectrum Cybersecurity Guardian!” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Rebasoft Limitedrebasoft.netHQ: Reading, United KingdomReported employees: 11-50 | Reading, United Kingdom | 11-50 | Exact match | 6 contacts → |
“Rebasoft is a UK based Software and Services company, founded in 2009 and produces software solutions for the Cyber Security market space.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Zeroday Co., LTDzeroday.co.ukHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 3 contacts → |
“Zeroday Co, Ltd is a company focusing on developing and delivering state-of-art application security testing tools/platforms.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Vulertvulert.comHQ: Edinburgh, United KingdomReported employees: 1-10 | Edinburgh, United Kingdom | 1-10 | Exact match | 3 contacts → |
“Vulert is a Software Composition Analysis (SCA) platform for monitoring vulnerabilities in open-source dependencies.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Securityiumsecurityium.comHQ: London, United KingdomReported employees: 1-10 | London, United Kingdom | 1-10 | Exact match | 3 contacts → |
“At Securityium, we're dedicated to transforming the way you experience security testing for your business.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Datamangodatamango.ioHQ: Southampton, United KingdomReported employees: 1-10 | Southampton, United Kingdom | 1-10 | Exact match | 3 contacts → |
“Datamango is the UK team to bring your software product to life-built fast, engineered for security, and ready to scale.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Clear Loop Securityclearloopsecurity.comHQ: Leeds, United KingdomReported employees: 1-10 | Leeds, United Kingdom | 1-10 | Exact match | 2 contacts → |
“Clear Loop Security is a Vulnerability Management Solution vendor and a forward-looking cyber and information security consultancy, focused on the real challenges of protecting…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Cyber Legioncyberlegion.ioHQ: London, United KingdomReported employees: 1-10 | London, United Kingdom | 1-10 | Exact match | 2 contacts → |
“Cyber Legion is the corporate technology and engineering organisation of Cyber Legion Ltd, a UK company designing, building, securing and governing AI systems, software products…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Darklabsdark-labs.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 1 contacts → |
“Darklabs is the IT security company that offers powerful testing capabilities affordably to all, allowing our clients to test more, more frequently, for less.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Itkaa LTDitkaa.comHQ: London, United KingdomReported employees: 1-10 | London, United Kingdom | 1-10 | Exact match | 1 contacts → |
“IT Security & Develpment” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Perimeterperimeter.studioHQ: Newcastle Upon Tyne, United KingdomReported employees: 1-10 | Newcastle Upon Tyne, United Kingdom | 1-10 | Exact match | 1 contacts → |
“At Perimeter, we turn visions into reality for both established enterprises and emerging businesses.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 75 company matches
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Software development security startups: dataset insights
November 5, 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
74 records in the displayed employee bands.
1 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 75 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: November 5, 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 ↗
Software development security startups by metro
Questions about this company list
What does Exact match mean for software development security startups?
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 software development security startups did RevenueBase find based in the United Kingdom?
The saved snapshot records 75 matching company records, 1,267 tracked contacts and 369 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: November 5, 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
Software development security startups by geography
- Software development security startups based in London, United Kingdom
- Software development security startups based in San Francisco, United States
- Software development security startups based in Australia
- Software development security startups based in Brazil
- Software development security startups based in Canada
- Software development security startups based in France
- Software development security startups based in Germany
- Software development security startups based in India
- Software development security startups based in the Netherlands
- Software development security startups based in the United States
Cite this list
RevenueBase Data Team. Top 25 software development security startups based in the United Kingdom. Snapshot: November 5, 2026. https://revenuebase.ai/companies/software-development-security-startups/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
- Software development security startups based in London, United Kingdom
- Software development security startups based in San Francisco, United States
- Software development security startups based in Australia
- Software development security startups based in Brazil
- Software development security startups based in Canada
- Software development security startups based in France
Company intelligence · public preview
Top 25 software development security startups based in the United Kingdom
RevenueBase records 75 matching company records for software development security startups based in the United Kingdom, with 1,267 tracked contacts and 369 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: November 5, 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 software development security startups 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 | Portswiggerportswigger.net HQ: Knutsford, United KingdomReported employees: 51-200 | Knutsford, United Kingdom | 51-200 | Exact match | 288 contacts → |
“PortSwigger is a global leader in the creation of software tools for security testing of web applications.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Secureflagsecureflag.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 65 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 3 | Interrupt Labsinterruptlabs.co.uk HQ: Basingstoke, United KingdomReported employees: 51-200 | Basingstoke, United Kingdom | 51-200 | Exact match | 63 contacts → |
“We’re here to provide world-leading vulnerability research and capabilities!” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Riversaferiversafe.co.uk HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 53 contacts → |
“We deliver services in Cybersecurity, Application Security and DevOps and are trusted by some of the world’s leading brands to maximise the value of their security investments and…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Coretech Securitycoretechsec.com HQ: Cheltenham, United KingdomReported employees: 51-200 | Cheltenham, United Kingdom | 51-200 | Exact match | 46 contacts → |
“CoreTech is a specialist cyber security company whose people are motivated by the desire to deliver exceptional capabilities coupled with a real sense of mission.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | DWSdws-global.com HQ: Marlow, United KingdomReported employees: 11-50 | Marlow, United Kingdom | 11-50 | Exact match | 45 contacts → |
“DWS is a global enterprise software services company delivering development, testing, and software supply chain security solutions.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Ldra Limitedldra.com HQ: Wirral, United KingdomReported employees: 51-200 | Wirral, United Kingdom | 51-200 | Exact match | 43 contacts → |
“For more than 45 years, LDRA has developed and driven the market for software that automates code analysis and software testing for safety, mission, security- and…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | PRQAprqa.com HQ: Walton On Thames, United KingdomReported employees: 51-200 | Walton On Thames, United Kingdom | 51-200 | Exact match | 38 contacts → |
“Detect, enforce and measure Since 1985, PRQA has pioneered software coding governance in the automotive, aerospace, transport, finance, medical device and energy industries.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Halo I.Shalo-is.co.uk HQ: Leeds, United KingdomReported employees: 11-50 | Leeds, United Kingdom | 11-50 | Exact match | 23 contacts → |
“Halo I.S is not just another cybersecurity organization based in the UK; we're a testament to evolution and client-centric innovation.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | CYTIXcytix.io HQ: Manchester, United KingdomReported employees: 11-50 | Manchester, United Kingdom | 11-50 | Exact match | 20 contacts → |
“Cytix is the security decision layer for a world where software development never stops.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Cloudsecurecloudsecure.ltd HQ: Cheltenham, United KingdomReported employees: 11-50 | Cheltenham, United Kingdom | 11-50 | Exact match | 20 contacts → |
“CloudSecure delivers secure software and cloud systems for security-critical environments.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | CYTALcytal.co.uk HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 14 contacts → |
“CyTAL exists to help developers, manufacturers and their customers to improve the security and resilience of products and systems.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Meterianmeterian.io HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 10 contacts → |
“Meterian secures your software supply chain by detecting and fixing open source vulnerabilities before they impact your business.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Punk Securitypunksecurity.co.uk HQ: Northallerton, United KingdomReported employees: 11-50 | Northallerton, United Kingdom | 11-50 | Exact match | 8 contacts → |
“We’re a Cyber Security consultancy that specialise in DevSecOps, bringing together development and security expertise.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Secure Debugsecuredebug.com HQ: Cranfield, United KingdomReported employees: 11-50 | Cranfield, United Kingdom | 11-50 | Exact match | 7 contacts → |
“Secure Debug: Your Full-Spectrum Cybersecurity Guardian!” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Rebasoft Limitedrebasoft.net HQ: Reading, United KingdomReported employees: 11-50 | Reading, United Kingdom | 11-50 | Exact match | 6 contacts → |
“Rebasoft is a UK based Software and Services company, founded in 2009 and produces software solutions for the Cyber Security market space.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Zeroday Co., LTDzeroday.co.uk HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 3 contacts → |
“Zeroday Co, Ltd is a company focusing on developing and delivering state-of-art application security testing tools/platforms.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Vulertvulert.com HQ: Edinburgh, United KingdomReported employees: 1-10 | Edinburgh, United Kingdom | 1-10 | Exact match | 3 contacts → |
“Vulert is a Software Composition Analysis (SCA) platform for monitoring vulnerabilities in open-source dependencies.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Securityiumsecurityium.com HQ: London, United KingdomReported employees: 1-10 | London, United Kingdom | 1-10 | Exact match | 3 contacts → |
“At Securityium, we're dedicated to transforming the way you experience security testing for your business.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Datamangodatamango.io HQ: Southampton, United KingdomReported employees: 1-10 | Southampton, United Kingdom | 1-10 | Exact match | 3 contacts → |
“Datamango is the UK team to bring your software product to life-built fast, engineered for security, and ready to scale.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Clear Loop Securityclearloopsecurity.com HQ: Leeds, United KingdomReported employees: 1-10 | Leeds, United Kingdom | 1-10 | Exact match | 2 contacts → |
“Clear Loop Security is a Vulnerability Management Solution vendor and a forward-looking cyber and information security consultancy, focused on the real challenges of protecting…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Cyber Legioncyberlegion.io HQ: London, United KingdomReported employees: 1-10 | London, United Kingdom | 1-10 | Exact match | 2 contacts → |
“Cyber Legion is the corporate technology and engineering organisation of Cyber Legion Ltd, a UK company designing, building, securing and governing AI systems, software products…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Darklabsdark-labs.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 1 contacts → |
“Darklabs is the IT security company that offers powerful testing capabilities affordably to all, allowing our clients to test more, more frequently, for less.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Itkaa LTDitkaa.com HQ: London, United KingdomReported employees: 1-10 | London, United Kingdom | 1-10 | Exact match | 1 contacts → |
“IT Security & Develpment” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Perimeterperimeter.studio HQ: Newcastle Upon Tyne, United KingdomReported employees: 1-10 | Newcastle Upon Tyne, United Kingdom | 1-10 | Exact match | 1 contacts → |
“At Perimeter, we turn visions into reality for both established enterprises and emerging businesses.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Software development security startups: dataset insights
November 5, 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
74 records in the displayed employee bands.
1 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 75 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: November 5, 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 ↗
Software development security startups by metro
Questions about this company list
What does Exact match mean for software development security startups?
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 software development security startups did RevenueBase find based in the United Kingdom?
The saved snapshot records 75 matching company records, 1,267 tracked contacts and 369 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: November 5, 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
Software development security startups by geography
- Software development security startups based in London, United Kingdom
- Software development security startups based in San Francisco, United States
- Software development security startups based in Australia
- Software development security startups based in Brazil
- Software development security startups based in Canada
- Software development security startups based in France
- Software development security startups based in Germany
- Software development security startups based in India
- Software development security startups based in the Netherlands
- Software development security startups based in the United States
Cite this list
RevenueBase Data Team. Top 25 software development security startups based in the United Kingdom. Snapshot: November 5, 2026. https://revenuebase.ai/companies/software-development-security-startups/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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- Software development security startups based in Canada
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