PerimeterX Raises $43M In Series C Funding To Fuel Expansion into New Markets and Accelerate Product Development The round will allow PerimeterX to expand its platform beyond bot protection to broader and complementary products protecting from other cloud security threats, as well as expansion into new verticals and new markets. SAN MATEO, Calif., February 11, 2019-- PerimeterX has secured $43 million in Series C funding to expand its product portfolio beyond its PX Bot Defender™ offering to address the growing variety of information security risks facing enterprises on their web and mobile properties and their APIs.