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OnSecurity

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OnSecurity provides AI red teaming and penetration testing services to identify vulnerabilities in large language models and AI-powered applications. The company combines manual expert testing with automation to uncover prompt injection attacks, data leaks, API weaknesses, and unsafe model behaviors in AI systems.

AI & Machine LearningCybersecurityDeveloper ToolsEnterprise SoftwareSaaS

Founders & leadership

COConor O'Neill
Conor O'NeillChief Executive Officer
DBDuncan Butchart
Duncan ButchartChief Revenue OfficerDuncan Butchart serves as Chief Revenue Officer at OnSecurity, a company providing AI red teaming and penetration testing services to identify vulnerabilities in large language models and AI-powered applications.
ALAdam Luxford
Adam LuxfordChief Operating OfficerAdam Luxford is a security consultant with fifteen years of experience in penetration testing, vulnerability assessments, and security audits, including roles as a CESG CHECK Team Leader and head of penetration testing at Logica. He has provided IT security assessments and testing services to organizations including McAfee, Visa Europe, and others before co-founding OnSecurity.

Investors · 2

Osney Capitallisted by Osney CapitalUK · $6.3M

How we know: Osney Capital's portfolio page · open dataset · 5k.vc investor directory · Not right? Tell us

Companies House · registry record

View on Companies House ↗
Registered name
ONSECURITY LLP
Company number
OC394445
Status
Dissolved
Company type
Limited liability partnership
Incorporated
24 Jul 2014
Dissolved
1 Jul 2025
Registered office
1 Victoria Street, Bristol, BS1 6AA
Accounts
last made up to 30 Sept 2023
Confirmation statement
last made up to 22 Jul 2024

Current officers

  • David Robert Hewson — llp designated member, appointed 24 Jul 2014
  • Adam Luxford — llp designated member, appointed 24 Jul 2014
  • Thomas Alexander Lindley — llp member, appointed 28 Apr 2016
  • Conor O'Neill — llp member, appointed 28 Apr 2016

Source: Companies House public register · retrieved 6 Sept 2026. Contains public sector information licensed under the Open Government Licence v3.0.

In the news

UK's cybersecurity provider OnSecurity raises £5.5M to scale penetration testing platform — TFNtechfundingnews.com · Jun 2024UK-based OnSecurity raises £5.5m to fuel pentest platform growthfintech.global · Jun 2024OnSecurity Technology Raises £5.5M in Seed Fundingfinsmes.com · Jun 2024OnSecurity Wins South West Business of the Year Awards for Investment - OnSecurityonsecurity.io

Frequently asked questions

What does OnSecurity do?
OnSecurity provides AI red teaming and penetration testing services to identify vulnerabilities in large language models and AI-powered applications. The company combines manual expert testing with automation to uncover prompt injection attacks, data leaks, API weaknesses, and unsafe model behaviors in AI systems.
Who founded OnSecurity?
OnSecurity was founded by Conor O'Neill.
Who are OnSecurity's investors?
OnSecurity's investors include Gresham House Ventures, Osney Capital.