Top Cyber Security Startups in United Kingdom (2025 Update)
Explore the best Cyber Security companies in United Kingdom. Discover high-growth startups and investment opportunities in our 2025 updated list.
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Explore Top Cyber Security Startups in United Kingdom featuring 670 Companies
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Cyber Heals | - | Redefining Cyber Prediction with AI Intelligence. | In the ever-evolving landscape of cyber threats, Cyber Heals stands out. Combini... | - |
United Kingdom
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London | United Kingdom (HQ) + 4 | 2021 | Cyber Security, Information Technology +1 | [email protected] |
1
Low
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29
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6.3K | 7 months ago | Pre Seed | 2 | 400.0K | 6170 | 1 year ago | |
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seedata.io | - | Force attackers into revealing themselves | Seedata.io detect attackers by luring them to disclose their presence, turning t... | - |
United Kingdom
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London | United Kingdom (HQ) | 2021 | Cyber Security, Information Technology +2 | [email protected] |
1
Low
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7
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2.8K (75%) | 3 years ago | Pre Seed | 2 | 760.0K | 1835 | 5 months ago | |
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MyDocSafe | - | Lower your compliance risk and improve customer experience through faster and mo... |
We are hiring! https://www.indeedjobs.com/docsafe-limited/ MyDocSafe helps comp... |
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United Kingdom
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Bedford | United Kingdom (HQ) | 2013 | Analytics, Cloud Infrastructure +3 | [email protected] |
1
Low
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6
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13.2K (-23%) | 7 years ago | Seed | 3 | 290.0K | 381 | 1 year ago | |
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IOTech | - | The Leader in Open Edge Computing | IOTech makes industrial data easily accessible, actionable, and manageable for t... | - |
United Kingdom
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Newcastle Upon Tyne | United Kingdom (HQ) + 2 | 2017 | Cyber Security, Information Technology +1 | [email protected] |
1
Low
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48
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6.9K (30%) | 1 year ago | Series Unknown | 5 | 10.6M | 3651 | 11 months ago | |
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OwlGaze | - | Next-Gen AI SIEM Designed by Security Experts for Proactive Security Teams |
OwlGaze is the cybersecurity software company behind Blacklight AI SIEM. Blackl... |
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United Kingdom
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London | United Kingdom (HQ) + 4 | 2020 | AI, Cyber Security +1 | [email protected] |
1
Low
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11
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558 (-100%) | 1 year ago | Non Equity Assistance | 3 | 4.0M | 2921 | 1 year ago | |
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RankedRight | - | Automated vulnerability management defined by YOU | Acquired by Lansweeper. Follow Lansweeper here: https://www.linkedin.com/company... | - |
United Kingdom
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London | United Kingdom (HQ) | 2020 | Cyber Security, SaaS | [email protected] |
1
Low
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22
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665 (-40%) | 4 years ago | Seed | 1 | 500.0K | 1049 | 1 year ago | |
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Traced Mobile Security | - | Mobile cybersecurity for individuals and businesses. Protect against malicious a... | Traced are a team of mobile privacy and security experts who developed the Trust... | - |
United Kingdom
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Oxford | United Kingdom (HQ) | 2020 | Cyber Security, IT +2 | [email protected] |
1
Low
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5
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59.6K | 3 years ago | Seed | 3 | 450.0K | 4334 | 5 months ago | |
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SOC.OS | - | SOC.OS automates alert correlation and triage, enriching, correlating, and prior... |
SOC.OS has joined the Sophos family! Learn more about Sophos’ acquisition of SO... |
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United Kingdom
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London | United Kingdom (HQ) | 2020 | Cyber Security, SaaS | [email protected] |
1
Low
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3
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886 | 4 years ago | Seed | 1 | 2.0M | 1652 | 2 years ago | |
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Phoenix Security | ASPM | - | Fix Vulnerabilities that matter most, via actionable Risk-based Contextual Prior... | The Phoenix Security solution enables you to prioritize vulnerabilities from cod... | - |
United Kingdom
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London | United Kingdom (HQ) + 4 | 2021 | Cloud Infrastructure, Cyber Security +1 | [email protected] |
1
Low
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21
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7.5K | 1 year ago | Pre Seed | 5 | 1.2M | 2293 | 9 months ago | |
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Bamboo Systems Group | Not active anymore | Dedicated to changing the future of data center server design. | Bamboo Systems provides a new-generation of ARM based server-class platform that... | - |
United Kingdom
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Cambridge | United Kingdom (HQ) + 1 | 2015 | Computing, Content Creators +2 | - |
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N/A
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912
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471 | 4 years ago | Series Unknown | 3 | 11.5M | 514 | 3 years ago | |
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Zeetta Networks | - | Making network connectivity consumable by application DevOps |
Enabling enterprises to deploy applications at scale. Zeetta Networks Ltd is a... |
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United Kingdom
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Bristol | United Kingdom (HQ) | 2015 | Creator Economy, Cyber Security +5 | [email protected] |
1
Low
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5
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1.3K (30%) | 4 years ago | Convertible Note | 5 | 6.6M | 1686 | 1 year ago | |
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CyberQ Group | - | Award Winning Global Cyber Security Services & Consultancy. CyberQ Group - We M... | CyberQ Group is an award winning UK-based cyber security services provider with... | - |
United Kingdom
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Birmingham | United Kingdom (HQ) + 2 | 2017 | AI, Cyber Security +1 | [email protected] |
1
Low
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44
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588 (2995%) | 1 year ago | Series Unknown | 2 | 3.8M | 6123 | 5 months ago | |
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Crypto Quantique | - | Crypto Quantique is a quantum driven cybersecurity company addressing the growin... | Crypto Quantique is building the most secure end-to-end IoT security platform. W... | - |
United Kingdom
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London | United Kingdom (HQ) | 2016 | Cyber Security, Hardware +1 | [email protected] |
1
Low
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47
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3.4K | 1 year ago | Non Equity Assistance | 8 | 15.2M | 7326 | 5 months ago | |
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eCora | - | Cybersecurity, Security Container, Data Centric Security | eCora Security Container | - |
United Kingdom
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Leicester | United Kingdom (HQ) | 2017 | Blockchain, Cyber Security +1 | - |
1
Low
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3
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852 (-100%) | 4 years ago | Pre Seed | 1 | 190.0K | 70235 | 1 year ago | |
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Mindera | - | We craft software with people we love. | Software Engineering Applications, including Web and Mobile, are at the core of... | - |
United Kingdom
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Leicester | United Kingdom (HQ) + 10 | 2014 | Big Data, Cloud Infrastructure +4 | [email protected] |
1
Low
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952
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559 (-100%) | 3 years ago | Debt Financing | 2 | 2.1M | 96961 | 5 months ago | |
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Quorum Cyber | - | We help good people win. Defending customers against cyber security attacks wi... |
At Quorum Cyber, we're on a mission to help good people win. Founded in Edinbu... |
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United Kingdom
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Edinburgh | United Kingdom (HQ) + 2 | 2016 | Cyber Security, Information Technology | [email protected] |
1
Low
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258
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9.1K (17%) | 1 year ago | Private Equity | 2 | 2.7M | 8429 | 5 months ago | |
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DynaRisk | - | Identify & Manage Cyber Risks At Scale, with DynaRisk. |
Identify & Manage Cyber Risks At Scale, with DynaRisk. Our mission at DynaRisk... |
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United Kingdom
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London | United Kingdom (HQ) | 2015 | Cyber Security, Information Technology +2 | [email protected] |
1
Low
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16
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684 (-100%) | 3 years ago | Seed | 3 | 4.0M | 1217 | 5 months ago | |
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CyberOwl | - | Helping fleet operators gain visibility, cybersecurity and cyber compliance of s... | CyberOwl helps asset operators in the maritime and critical national infrastruct... | - |
United Kingdom
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London | United Kingdom (HQ) + 3 | 2016 | Analytics, Cyber Security +2 | [email protected] |
1
Low
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53
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1.3K (-32%) | 1 year ago | Undisclosed | 9 | 8.6M | 7416 | 5 months ago | |
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Idenprotect | - | Idenprotect. Security Simplified. Productivity Elevated | Idenprotect is a leading cybersecurity company specialising in a range of phishi... | - |
United Kingdom
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Guildford | United Kingdom (HQ) | 2014 | Analytics, Cyber Security +2 | [email protected] |
1
Low
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20
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874 (7%) | 5 years ago | Series A | 2 | 3.8M | 1162 | 5 months ago | |
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Gospel Technology | - | Trust, protect and retain control of your sensitive data in the cloud. | Gospel Technology was founded from the belief that the control, privacy and owne... | - |
United Kingdom
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London | United Kingdom (HQ) + 1 | 2016 | Cyber Security | [email protected] |
1
Low
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8
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810 | 6 years ago | Non Equity Assistance | 6 | 6.4M | 1225 | 2 years ago | |
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KYND | - | Cyber risk management for every business. Simple to understand, quick to monitor... | Organisations of all sizes have or will be impacted by cyber risks and whilst th... | - |
United Kingdom
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London | United Kingdom (HQ) | 2018 | Cyber Security, Insurtech | [email protected] |
1
Low
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66
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954 (-100%) | 1 year ago | Secondary Market | 3 | 7.1M | 2272 | 5 months ago | |
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BlackDice | - | BlackDice offers AI cybersecurity solutions for telecoms operators, reducing chu... | BlackDice, a graduate of the NCSC/GCHQ accelerator program's 2019 cohort, offers... | - |
United Kingdom
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Leeds | United Kingdom (HQ) + 1 | 2021 | AI, Cyber Security +1 | [email protected] |
1
Low
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672
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960 | 5 years ago | Seed | 1 | 500.0K | 1213 | 11 months ago | |
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Messagenius | - | Secure enterprise messaging for smart, secure and integrated communication among... | Messagenius is the secure enterprise messaging for smart, secure and integrated... | - |
United Kingdom
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London | United Kingdom (HQ) + 1 | 2012 | AI, Cyber Security +3 | [email protected] |
1
Low
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10
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1.5K (-32%) | 9 years ago | Pre Seed | 2 | 150.0K | 1397 | 5 months ago | |
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RapidSpike | - | Making websites faster, safer & more reliable. Improve conversions with our next... | RapidSpike believes everyone expects & has the right to, fast, safe & reliable o... | - |
United Kingdom
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Leeds | United Kingdom (HQ) | 2015 | Cyber Security, Information Technology +1 | [email protected] |
1
Low
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10
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3.7K (-26%) | 4 years ago | Series Unknown | 2 | 1.5M | 1824 | 5 months ago | |
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Crypta Labs | - | Compact, low power and affordable hardware quantum random number generator desig... | Crypta Labs is a cyber security company developing Quantum seeded random number... | - |
United Kingdom
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London | United Kingdom (HQ) | 2014 | Cyber Security, IoT +2 | [email protected] |
1
Low
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12
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899 | 5 years ago | Debt Financing | 4 | 4.4M | 1349 | 8 months ago | |
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Garrison | Now a part of... | - | Protecting government and enterprises against the world’s most complex cyber cha... | Garrison is a London-based cybersecurity company founded in 2014 by David Garfie... | - |
United Kingdom
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London | United Kingdom (HQ) | 2014 | Cyber Security | [email protected] |
1
Low
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106
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134 (-100%) | 6 years ago | Non Equity Assistance | 5 | 34.9M | 13647 | 5 months ago | |
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Keyless | - | Simple, secure, private biometric authentication. |
The biometric authentication company that does not store biometric data. Keyle... |
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United Kingdom
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London | United Kingdom (HQ) + 2 | 2019 | Analytics, Cyber Security +3 | [email protected] |
1
Low
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69
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117.2K (157%) | 4 months ago | Select | 9 | 26.0M | 10155 | 5 months ago | |
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Ravelin Technology | - | Make smarter decisions on fraud and payments. | AI-native fraud prevention company Ravelin provides sophisticated technology and... | - |
United Kingdom
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London | United Kingdom (HQ) | 2014 | Big Data, Cyber Security +2 | [email protected] |
1
Low
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142
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947 (-100%) | 4 years ago | Series C | 5 | 28.7M | 27313 | 3 months ago | |
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Intruder | - | Use Intruder for real-time discovery and prioritization of attack surface weakne... | Intruder was founded in 2015 to help solve the information overload crisis in vu... | - |
United Kingdom
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London | United Kingdom (HQ) | 2015 | Cyber Security | [email protected] |
1
Low
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77
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60.0K | 4 years ago | Seed | 5 | 915.0K | 4135 | 3 months ago | |
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CultureAI | - | An innovative Human Risk Management Platform enabling security teams to identify... | CultureAI’s innovative Human Risk Management Platform empowers you to identify w... | - |
United Kingdom
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Manchester | United Kingdom (HQ) + 1 | 2015 | Cyber Security, Information Technology +1 | [email protected] |
1
Low
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47
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14.3K | 10 months ago | Series A | 5 | 23.5M | 4435 | 3 months ago | |
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Red Sift | - | Red Sift helps the best security teams understand and remediate cybersecurity ri... | Red Sift enables organizations to anticipate, respond to, and recover from cyber... | - |
United Kingdom
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London | United Kingdom (HQ) + 3 | 2015 | Big Data, Cyber Security +2 | [email protected] |
1
Low
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113
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49.2K | 3 years ago | Series B | 7 | 64.8M | 10092 | 4 months ago | |
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SenseOn | - | SenseOn hyperautomates threat detection and response, giving you unparalleled vi... | SenseOn, founded in 2017, revolutionises cybersecurity with AI-driven NDR, EDR,... | - |
United Kingdom
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London | United Kingdom (HQ) | 2017 | AI, Cyber Security +2 | [email protected] |
1
Low
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68
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4.8K | 3 years ago | Series A | 3 | 26.4M | 19295 | 7 months ago | |
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Venari Security | - | Cryptographic Discovery Tool | Cryptographic Visibility | Internal and Regulator... | Venari Security provides organisations with advanced visibility into their encry... | - |
United Kingdom
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London | United Kingdom (HQ) + 1 | 2021 | Cyber Security | [email protected] |
1
Low
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47
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967 | 3 years ago | Series A | 1 | 6.0M | 7624 | 3 months ago | |
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PQShield | - | Leading Experts in Post-Quantum Cryptography For Software and Hardware "Think... | Our team is shaping the way our digital world is protected against the threats o... | - |
United Kingdom
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Oxford | United Kingdom (HQ) + 2 | 2018 | Cyber Security, Quantum | [email protected] |
1
Low
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77
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34.4K | 11 months ago | Series B | 5 | 63.9M | 13556 | 3 months ago | |
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Risk Ledger | - | Be confident in your supply chain security | Over 60% of organisations have experienced a cyber incident caused by a compromi... | - |
United Kingdom
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London | United Kingdom (HQ) + 1 | 2018 | Cyber Security, Supply Chain | [email protected] |
1
Low
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65
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17.3K | 1 year ago | Series A | 4 | 9.8M | 4927 | 3 months ago | |
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Immersive | - | The leader in people-centric cyber resilience. | The leader in people-centric cyber resilience. We envision a world in which ever... | - |
United Kingdom
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Bristol | United Kingdom (HQ) + 2 | 2017 | Cyber Security, Developer Tools +1 | [email protected] |
1
Low
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344
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97.7K | 2 years ago | Series C | 6 | 189.0M | 28171 | 3 months ago | |
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Envelop Risk | - | Progress Secured | Envelop Risk is a global specialty cyber underwriting firm, combining decades of... | - |
United Kingdom
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Bristol | United Kingdom (HQ) + 1 | 2016 | Cyber Security, Information Technology | - |
1
Low
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56
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3.0K | 3 years ago | Series B | 3 | 135.8M | 2060 | 3 months ago | |
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CAPSLOCK | - | Award-winning online cyber security courses that help adults change careers and... | CAPSLOCK is a revolutionary training company which delivers career-changing cybe... | - |
United Kingdom
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Manchester | United Kingdom (HQ) + 1 | 2019 | Cloud Infrastructure, Cyber Security +3 | [email protected] |
1
Low
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359
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5.8K (-50%) | 3 years ago | Pre Seed | 4 | 1.0M | 19170 | 3 months ago | |
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CyberSmart | - | Cybersecurity should be simple. Protect your business with CyberSmart. #BeCyberS... | Stop cyber attacks dead in their tracks with CyberSmart: an all-in-one cybersecu... | - |
United Kingdom
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London | United Kingdom (HQ) | 2016 | B2B, Cyber Security +2 | [email protected] |
1
Low
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75
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15.7K | 2 years ago | Series B | 8 | 26.9M | 11302 | 5 months ago | |
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CybSafe | - | The human risk management platform | CybSafe measures and tracks security behaviour to improve security controls and... | - |
United Kingdom
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London | United Kingdom (HQ) | 2017 | Analytics, Cyber Security | [email protected] |
1
Low
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66
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31.6K | 3 years ago | Series B | 4 | 40.2M | 13733 | 4 months ago |