Virsec

Virsec, founded in 2015 and headquartered in San Jose, California, builds a runtime workload-protection platform that maps the expected control flow and memory behavior of an application at the process level, then blocks any deviation in real time. The company positions this as detecting and stopping exploitation, including zero-day and fileless attacks, without relying on signatures, behavioral baselines that require training periods, or network-perimeter visibility.

The company has raised approximately $137 million total, including a $100 million Series C in 2021 led by BlueIO with participation from a roster of investors that includes former Cisco CEO John Chambers and former EMC CEO Mike Ruettgers, alongside several former US government and intelligence officials, a notable investor base for a company targeting critical-infrastructure and OT-adjacent IT environments where legacy systems can’t easily be patched or replaced. Virsec’s core differentiator versus conventional EDR is that its protection operates at the application-process level rather than relying purely on endpoint telemetry and known-bad indicators, which the company argues makes it effective against attacks that exploit legitimate application logic, such as memory corruption or deserialization attacks, that signature- or anomaly-based tools can miss.

Independent, third-party validation of Virsec’s specific detection claims is limited; most performance figures circulating publicly originate from Virsec’s own marketing and analyst-briefing materials rather than audited third-party testing.