London and San Francisco-based Asymmetric Security has raised $4.2 million in an oversubscribed pre-seed round to accelerate how organisations investigate cyberattacks.

The funding was led by Susa Ventures, with participation from Halcyon Ventures and Overlook Ventures, alongside angels including Charlie Songhurst, Matt Clifford and Geoff Ralston.

Founded by Zainab Ali Majid, Pippa Thompson and Alexis Carlier, the startup is building an AI-native cyber forensics platform designed to speed up threat hunting and incident response using secure automation and expert validation.

It plans to use the funding to grow its engineering and incident response teams while expanding into areas such as ransomware, insider threats and nation-state incidents.