OnSecurity

Productised, CREST-accredited pentest-as-a-service for the UK mid-market

Bristol, United KingdomFounded 201850-200 peopleEnglishonsecurity.io

L2Cross-referenced, highest level reached

1 cross-referenced

Verified against independent sources

marketplace.crest.org2026-07-04

No customer ratings yet. How L3 ratings work →

Request verified quotes Visit website ↗

Routing your brief is free, providers fund the channel. Capped at three recipients.

OnSecurity is a L2-verified AI-implementation provider based in Bristol, United Kingdom, delivering red-team, appsec, vulnerability-mgmt. Ranked on proof, 1 verified records on the Trustgent index.

What they build

OnSecurity is a Bristol-headquartered penetration testing provider founded in 2018 by career ethical hackers, delivering CREST-accredited web, mobile, cloud, infrastructure, physical and social-engineering testing through a productised PTaaS model with two SaaS platforms: Scan (continuous vulnerability scanning) and Radar (attack-surface and threat intel). Now serving 400+ customers across UK SaaS, fintech and retail with LLM/AI red-teaming capability added in 2024, backed by a £5.5M Series A.

Quick facts

HQ: Bristol, United Kingdom
Founded: 2018
Team: 50-200
Languages: English
Stack

Capabilities

Red teaming
Application security
Vulnerability management
Penetration testing

Industries served

Financial services
Healthcare
Retail & e-commerce
SaaS & technology

Regulatory readiness

Cross-referenced against public registries where a public source exists (L2+). The check mark marks an attribute we have a source for, see the proof page.

About OnSecurity

What does OnSecurity build?

OnSecurity is a L2-verified AI-implementation provider on Trustgent, delivering Red teaming, Application security, Vulnerability management.

Where is OnSecurity based?

OnSecurity is headquartered in Bristol, United Kingdom.

How is OnSecurity verified on Trustgent?

OnSecurity has an EARNED verification level of L2 on Trustgent, with 1 contributing verified records (most recent verification: 2026-07-05). Verification is independent of any subscription, plan tier is never a ranking input.

How is OnSecurity ranked?

Rank is a pure function of three EARNED signals: verification level (dominant), record count, and recency. No plan, fee, spend, or paid placement is ever an input. See https://trustgent.com/how-we-rank.