Callsign raises USD35m Series A led by Accel and PTB Ventures
Callsign, an artificial intelligence-based authentication platform, has raised USD35 million in a Series A investment round led by global venture capital firm Accel and early-stage investor PTB Ventures. Allegis Capital and cybersecurity industry veteran David DeWalt’s NightDragon Security also participated in the round. With the proliferation of data breaches,
