OnSecurity
2 known investors
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.
Founders & leadership
Investors · 2
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
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.