# Top 50 Security Startups in the United Kingdom by Funding (2026)

> The 50 best-funded security startups in the United Kingdom, ranked by total funding raised: $3.9B combined.

Source: https://millionrounds.com/top-lists/security-startups-united-kingdom (Millionrounds; every figure on the page links to its filing or article)

- 1 [**TEKEVER**](https://millionrounds.com/company/tekever) *Founded* 2013 United Kingdom **$654M** last round Sept 2026
- 2 [**Quantexa** Quantexa is a UK-based software company founded in 2016, specializing in Contextual Decision Intelligence (CDI).](https://millionrounds.com/company/quantexa) Quantexa is a UK-based software company founded in 2016, specializing in Contextual Decision Intelligence (CDI). *Founded* 2016 London, United Kingdom **$471M** last round Mar 2026
- 3 [**Darktrace** Darktrace is an AI company that uses cybersecurity solutions to identify, prevent, and eliminate insider threats.](https://millionrounds.com/company/darktrace) Darktrace is an AI company that uses cybersecurity solutions to identify, prevent, and eliminate insider threats. *Founded* 2013 Cambridge, United Kingdom **$425M** last round May 2021
- 4 [**Blackwall** Blackwall is an AI-enabled security infrastructure company based in Tallinn, Estonia.](https://millionrounds.com/company/blackwall) Blackwall is an AI-enabled security infrastructure company based in Tallinn, Estonia. *Founded* 2019 Tallinn, United Kingdom **$162M** last round Oct 2026
- 5 [**Tessian** Tessian creates a Human Layer Security that helps people work without security disruptions getting in the way.](https://millionrounds.com/company/tessian) Tessian creates a Human Layer Security that helps people work without security disruptions getting in the way. *Founded* 2013 Boston, United Kingdom **$127M** last round Dec 2023
- 6 [**Featurespace** Featurespace provides an adaptive behavioral analytics technology and automated deep behavioral networks for risk management.](https://millionrounds.com/company/featurespace) Featurespace provides an adaptive behavioral analytics technology and automated deep behavioral networks for risk management. *Founded* 2008 Cambridge, United Kingdom **$125M** last round Dec 2024
- 7 [**Snyk**](https://millionrounds.com/company/snyk) *Founded* 2015 United Kingdom **$117M** last round Jan 2023
- 8 [**Inforcer** inforcer is a London-based cybersecurity and software company founded in 2022.](https://millionrounds.com/company/inforcer) inforcer is a London-based cybersecurity and software company founded in 2022. *Founded* 2022 Richmond, United Kingdom **$113M** last round Jul 2026
- 9 [**Callsign** Callsign is a global technology company based in London, UK, that focuses on digital identity, fraud prevention, and behavioral authentication.](https://millionrounds.com/company/callsign) Callsign is a global technology company based in London, UK, that focuses on digital identity, fraud prevention, and behavioral authentication. *Founded* 2011 London, United Kingdom **$109M** last round Jun 2023
- 10 [**Immersive Labs** Immersive Labs develops a platform that measures and improves cybersecurity skills across businesses.](https://millionrounds.com/company/immersive-labs) Immersive Labs develops a platform that measures and improves cybersecurity skills across businesses. *Founded* 2017 Bristol, United Kingdom **$104M** last round Jun 2025
- 11 [**Mypinpad** Mypinpad is a global leader in mobile card payments acceptance and identity authentication software solutions.](https://millionrounds.com/company/mypinpad) Mypinpad is a global leader in mobile card payments acceptance and identity authentication software solutions. *Founded* 2012 Cardiff, United Kingdom **$94M** last round Jun 2026
- 12 [**Mimecast** Mimecast is a SaaS-based email management platform enabling companies to administer business communications and data.](https://millionrounds.com/company/mimecast) Mimecast is a SaaS-based email management platform enabling companies to administer business communications and data. *Founded* 2003 London, United Kingdom **$90M** last round Sept 2012
- 13 [**Onfido** Onfido is a provider of automated digital identity verification.](https://millionrounds.com/company/onfido) Onfido is a provider of automated digital identity verification. *Founded* 2012 London, United Kingdom **$85M** last round Apr 2019
- 14 [**iProov** iProov is a London-based technology company founded in 2011, specializing in biometric face verification.](https://millionrounds.com/company/iproov) iProov is a London-based technology company founded in 2011, specializing in biometric face verification. *Founded* 2011 London, United Kingdom **$77M** last round Nov 2023
- 15 [**Feedzai**](https://millionrounds.com/company/feedzai) *Founded* - United Kingdom **$76M** last round Oct 2017
- 16 [**Immersive** We grow your talent acquisition team with professional On-Demand in-house recruiters.](https://millionrounds.com/company/immersive) We grow your talent acquisition team with professional On-Demand in-house recruiters. *Founded* 2020 United Kingdom **$66M** last round Oct 2022
- 17 [**Privitar** Privitar is a data privacy platform that protects its customer's sensitive personal data and delivers comprehensive data privacy.](https://millionrounds.com/company/privitar) Privitar is a data privacy platform that protects its customer's sensitive personal data and delivers comprehensive data privacy. *Founded* 2014 United Kingdom **$64M** last round Jun 2020
- 18 [**PQShield** PQShield is a post-quantum cryptography company founded in 2018 as a spin-out from the University of Oxford’s Mathematical Institute.](https://millionrounds.com/company/pqshield) PQShield is a post-quantum cryptography company founded in 2018 as a spin-out from the University of Oxford’s Mathematical Institute. *Founded* 2018 Oxford, United Kingdom **$57M** last round Mar 2026
- 19 [**Hack The Box** Hack The Box (HTB) is a leading platform for cybersecurity education, certification, and talent assessment, founded in 2017.](https://millionrounds.com/company/hack-the-box) Hack The Box (HTB) is a leading platform for cybersecurity education, certification, and talent assessment, founded in 2017. *Founded* 2017 Folkestone, United Kingdom **$56M** last round Jan 2023
- 20 [**Panaseer** Panaseer is an enterprise cybersecurity company founded in 2014, headquartered in Godalming, United Kingdom, with an office in New York, USA.](https://millionrounds.com/company/panaseer) Panaseer is an enterprise cybersecurity company founded in 2014, headquartered in Godalming, United Kingdom, with an office in New York, USA. *Founded* 2014 Godalming, United Kingdom **$48M** last round Mar 2026
- 21 [**Yoti** Yoti is a digital identity platform that provides secure identity verification, online and in person.](https://millionrounds.com/company/yoti) Yoti is a digital identity platform that provides secure identity verification, online and in person. *Founded* 2014 London, United Kingdom **$47M** last round Dec 2023
- 22 [**Digital Shadows** Digital Shadows identifies unwanted exposure, protect against external threats, and minimize digital risk.](https://millionrounds.com/company/digital-shadows) Digital Shadows identifies unwanted exposure, protect against external threats, and minimize digital risk. *Founded* 2011 London, United Kingdom **$44M** last round Jul 2019
- 23 [**Risk Ledger** Risk Ledger is a London-based cybersecurity company founded in 2018, specializing in third-party risk management (TPRM).](https://millionrounds.com/company/risk-ledger) Risk Ledger is a London-based cybersecurity company founded in 2018, specializing in third-party risk management (TPRM). *Founded* 2018 London, United Kingdom **$43M** last round Jul 2026
- 24 [**Lazarus AI** Lazarus builds AI systems that help people solve the world’s toughest problems.](https://millionrounds.com/company/lazarus-ai) Lazarus builds AI systems that help people solve the world’s toughest problems. *Founded* 2017 Boston, United Kingdom **$43M** last round Nov 2026
- 25 [**Geordie AI** Geordie AI is a London-based cybersecurity startup founded in 2025.](https://millionrounds.com/company/geordie-ai) Geordie AI is a London-based cybersecurity startup founded in 2025. *Founded* 2025 London, United Kingdom **$42M** last round May 2026
- 26 [**Netsparker** Netsparker is an easy to use and highly accurate web application security solution for all types of web applications.](https://millionrounds.com/company/netsparker) Netsparker is an easy to use and highly accurate web application security solution for all types of web applications. *Founded* 2009 United Kingdom **$40M** last round Mar 2018
- 27 [**Coincover** CoinCover is a UK-based digital asset security and risk management company founded in May 2018 in Cardiff, Wales.](https://millionrounds.com/company/coincover) CoinCover is a UK-based digital asset security and risk management company founded in May 2018 in Cardiff, Wales. *Founded* 2018 London, United Kingdom **$39M** last round Feb 2026
- 28 [**TurinTech** Turin Tech is an engineering service company that specializes in designing and developing industrial automation solutions.](https://millionrounds.com/company/turintech) Turin Tech is an engineering service company that specializes in designing and developing industrial automation solutions. *Founded* 2000 Moncalieri, United Kingdom **$35M** last round Mar 2025
- 29 [**Preservica**](https://millionrounds.com/company/preservica) *Founded* 2012 United Kingdom **$32M** last round Nov 2023
- 30 [**Garrison**](https://millionrounds.com/company/garrison) *Founded* - United Kingdom **$30M** last round Oct 2018
- 31 [**Mimiro** Mimiro is in developing digital solutions for the food growth and production process.](https://millionrounds.com/company/mimiro) Mimiro is in developing digital solutions for the food growth and production process. *Founded* 2018 United Kingdom **$30M** last round Jan 2019
- 32 [**SenseOn** SenseOn is an AI-driven cybersecurity company based in London, United Kingdom, founded in 2017.](https://millionrounds.com/company/senseon) SenseOn is an AI-driven cybersecurity company based in London, United Kingdom, founded in 2017. *Founded* 2017 London, United Kingdom **$26M** last round Sept 2021
- 33 [**CyberSmart** CyberSmart is a UK-based cybersecurity and compliance technology company founded in 2016 and headquartered in London.](https://millionrounds.com/company/cybersmart) CyberSmart is a UK-based cybersecurity and compliance technology company founded in 2016 and headquartered in London. *Founded* 2016 London, United Kingdom **$26M** last round Feb 2023
- 34 [**Bitfount** Bitfount is a London-based technology company founded in 2020 that offers a federated AI and data science platform.](https://millionrounds.com/company/bitfount) Bitfount is a London-based technology company founded in 2020 that offers a federated AI and data science platform. *Founded* 2020 London, United Kingdom **$26M** last round Jul 2025
- 35 [**Tracebit** Tracebit provides a cloud threat detection and deception platform that employs decoy systems to attract and capture attackers.](https://millionrounds.com/company/tracebit) Tracebit provides a cloud threat detection and deception platform that employs decoy systems to attract and capture attackers. *Founded* 2022 Manhattan, United Kingdom **$26M** last round Mar 2026
- 36 [**ThreatAware** ThreatAware is a London-based cybersecurity startup that specializes in Cyber Asset Attack Surface Management (CAASM) and Cyber Hygiene.](https://millionrounds.com/company/threataware) ThreatAware is a London-based cybersecurity startup that specializes in Cyber Asset Attack Surface Management (CAASM) and Cyber Hygiene. *Founded* 2019 London, United Kingdom **$25M** last round Feb 2026
- 37 [**SafeToNet** SafeToNet makes the digital world safer for children to explore and enjoy.](https://millionrounds.com/company/safetonet) SafeToNet makes the digital world safer for children to explore and enjoy. *Founded* 2013 Reading, United Kingdom **$23M** last round Sept 2026
- 38 [**Ravelin** Ravelin is a smart fraud detection and prevention platform that helps companies stop online payment fraud.](https://millionrounds.com/company/ravelin) Ravelin is a smart fraud detection and prevention platform that helps companies stop online payment fraud. *Founded* 2014 London, United Kingdom **$23M** last round Jul 2020
- 39 [**Prevalent AI** Prevalent AI is a London-based cybersecurity company founded in 2017 by former GCHQ and UK government officials, including CEO Paul Stokes and COO Arun Raj.](https://millionrounds.com/company/prevalent-ai) Prevalent AI is a London-based cybersecurity company founded in 2017 by former GCHQ and UK government officials, including CEO Paul Stokes and COO Arun Raj. *Founded* 2017 London, United Kingdom **$22M** last round Aug 2026
- 40 [**Cado Security** Cado Security provides the cloud investigation platform that empowers security teams to respond to threats at cloud speed.](https://millionrounds.com/company/cado-security) Cado Security provides the cloud investigation platform that empowers security teams to respond to threats at cloud speed. *Founded* 2020 London, United Kingdom **$21M** last round Jun 2025
- 41 [**INCOPRO** Incopro is an online brand and intellectual property protection company.](https://millionrounds.com/company/incopro) Incopro is an online brand and intellectual property protection company. *Founded* 2011 United Kingdom **$21M** last round May 2018
- 42 [**watchTowr** watchTowr is a global cybersecurity technology company founded in 2021 and headquartered in Singapore, with additional offices in New York and London.](https://millionrounds.com/company/watchtowr) watchTowr is a global cybersecurity technology company founded in 2021 and headquartered in Singapore, with additional offices in New York and London. *Founded* 2021 Singapore, United Kingdom **$19M** last round Oct 2024
- 43 [**Sitehop** Sitehop develops cutting-edge networking and cyber-security solutions.](https://millionrounds.com/company/sitehop) Sitehop develops cutting-edge networking and cyber-security solutions. *Founded* 2021 Sheffield, United Kingdom **$18M** last round Oct 2025
- 44 [**CyberOwl** CyberOwl offers an early warning system for cyber attacks through real-time monitoring of high value targets for malicious behavior.](https://millionrounds.com/company/cyberowl) CyberOwl offers an early warning system for cyber attacks through real-time monitoring of high value targets for malicious behavior. *Founded* 2016 London, United Kingdom **$17M** last round Dec 2024
- 45 [**Yope**](https://millionrounds.com/company/yope) *Founded* - United Kingdom **$17M** last round Jul 2026
- 46 [**Outerlimit** Outerlimit provides AI security and governance for agentic AI systems, with controls for identity, access, risk assessment, and activity.](https://millionrounds.com/company/outerlimit) Outerlimit provides AI security and governance for agentic AI systems, with controls for identity, access, risk assessment, and activity. *Founded* - London, United Kingdom **$16M** last round Sept 2026
- 47 [**Augur** Augur is the next-generation perception engine that turns legacy sensor infrastructure into real‐time operational intelligence.](https://millionrounds.com/company/augur) Augur is the next-generation perception engine that turns legacy sensor infrastructure into real‐time operational intelligence. *Founded* 2023 London, United Kingdom **$15M** last round Mar 2026
- 48 [**RevEng.AI** RevEng.AI is a London-based cybersecurity and AI company that specializes in building an AI-powered binary intelligence platform for reverse engineering and mal](https://millionrounds.com/company/reveng-ai) RevEng.AI is a London-based cybersecurity and AI company that specializes in building an AI-powered binary intelligence platform for reverse engineering and mal *Founded* 2022 London, United Kingdom **$15M** last round May 2026
- 49 [**Bron Labs**](https://millionrounds.com/company/bron-labs) *Founded* 2024 United Kingdom **$15M** last round Oct 2025
- 50 [**Garrison Technology** Garrison designs and develops cyber-security based technology for enterprises.](https://millionrounds.com/company/garrison-technology) Garrison designs and develops cyber-security based technology for enterprises. *Founded* 2014 United Kingdom **$15M** last round Aug 2024

**Total funding** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: Millionrounds

Companies whose funding rounds we classed as this sector, ranked by the total they have raised in rounds we hold. Nobody pays to be on a list.

## Who backed them?

Open any company for its rounds and investors, or search the investors who back security startups in the United Kingdom in the app, with filters, lists and exports.

[Find their investors](https://millionrounds.com/login?join=1&next=/app/investors)[All top lists](https://millionrounds.com/top-lists)

## More security lists

[See all](https://millionrounds.com/top-lists?t=Security)

[*H* *K* *V* **Security startups worldwide** 1,740 companies · $30B](https://millionrounds.com/top-lists/security-startups)[*H* *K* *V* **Security startups in the United States** 1,085 companies · $29B](https://millionrounds.com/top-lists/security-startups-united-states)[*F* *VS* *G* **Security startups in France** 59 companies · $854M](https://millionrounds.com/top-lists/security-startups-france)[*V* *1* *T* **Security startups in Canada** 41 companies · $1.4B](https://millionrounds.com/top-lists/security-startups-canada)[*I* *S* *ML* **Security startups in Germany** 27 companies · $448M](https://millionrounds.com/top-lists/security-startups-germany)[*FC* *RP* *I* **Security startups in Spain** 26 companies · $293M](https://millionrounds.com/top-lists/security-startups-spain)[*A* *S* *E* **Security startups in Switzerland** 17 companies · $294M](https://millionrounds.com/top-lists/security-startups-switzerland)

## More lists for United Kingdom

[See all](https://millionrounds.com/top-lists?r=United%20Kingdom)

[*SC* *N* *F* **Startups in the United Kingdom** 8,355 companies · $79B](https://millionrounds.com/top-lists/startups-united-kingdom)[*IL* *CS* *ON* **Health startups in the United Kingdom** 1,094 companies · $17B](https://millionrounds.com/top-lists/health-startups-united-kingdom)[*N* *AA* *IL* **AI startups in the United Kingdom** 835 companies · $32B](https://millionrounds.com/top-lists/ai-startups-united-kingdom)[*C* *T* *K* **IT Services startups in the United Kingdom** 816 companies · $5.3B](https://millionrounds.com/top-lists/it-services-startups-united-kingdom)[*IL* *CS* *ON* **Healthcare startups in the United Kingdom** 608 companies · $14B](https://millionrounds.com/top-lists/healthcare-startups-united-kingdom)[*IL* *CS* *ON* **Biotech startups in the United Kingdom** 588 companies · $15B](https://millionrounds.com/top-lists/biotech-startups-united-kingdom)[*F* *FC* *R* **Financial Services startups in the United Kingdom** 472 companies · $26B](https://millionrounds.com/top-lists/financial-services-startups-united-kingdom)[*FC* *R* *C* **Fintech startups in the United Kingdom** 342 companies · $23B](https://millionrounds.com/top-lists/fintech-startups-united-kingdom)