A Security emerges from stealth with $32M Series A led by Lightspeed

What's the deal? A Security, an Israeli startup focused on autonomous offensive cybersecurity, emerged from stealth on Monday after raising $37M across two rounds. The company closed a $5M seed led by CyberStarts and a $32M Series A led by Lightspeed, with additional backing from Wiz founder Assaf Rappaport, Cyera founder Yotam Segev, and Cerca PartnersDealroom has a profile for this one. Try Dealroom →.

Founded in early 2025, A Security was built by alumni of SygniaDealroom has a profile for this one. Try Dealroom → and Hunters — two well-known Israeli cyber firms.

Why now? AI is rapidly changing the threat landscape. As attackers increasingly use AI to automate and scale cyberattacks, defenders need equally autonomous tools to keep pace. A Security aims to fill that gap with offensive security capabilities that can proactively identify and neutralise AI-driven threats.

What could go wrong? The offensive security space is crowded and fast-moving. Competing against established players while building trust around autonomous attack-simulation tools — which operate in sensitive environments — is no small challenge. The company will also need to prove it can move quickly enough to stay ahead of the very AI threats it aims to counter.

The signal: CyberStarts, a fund dedicated exclusively to backing cybersecurity founders, leading the seed underscores the pedigree investors see in A Security's team. With angel participation from the founders of Wiz and Cyera — two of Israel's fastest-scaling cyber companies — the round reads as a vote of confidence from operators who have built category-defining businesses themselves, suggesting the autonomous offensive-security niche is attracting the sharpest domain-expert capital available.