Founded in 2014, Source Defense offers client-side security for websites, providing real-time threat detection, protection and prevention of vulnerabilities originating in JavaScript. The company’s security platform provides a comprehensive and complete solution addressing threats and risks from the increased usage of JavaScript, libraries and open source in today’s websites.

Source Defense is seeking to address a major concern related to third-party supply chain risk, which has led to material adverse impacts on thousands of companies. One of the largest and least quantified business vulnerabilities lies in the website use of client-side JavaScript.

AllegisCyber originally partnered with Jerusalem Venture Partners and NightDragon to lead Source Defense's Series A financing.