Tessian

Tessian is an email security company that focuses on protecting enterprises from threats arising due to human error. It leverages machine learning to build behavioral models for all employees and automatically detect security threats such as business email compromise, data exfiltration, phishing, and accidental data loss. Tessian's platform, referred to as "human layer security," notifies employees of these issues to help improve individual security behaviors.

In May 2021, Tessian had raised a total of USD 123.7 million in funding and was valued at USD 500 million. At that time, the company planned to invest in research and development, expand its product offerings beyond email security, and grow its workforce globally.

Tessian's approach proved effective, as evidenced by a report from July 2022 that found US employees sent an average of four emails to the wrong person each month in the first nine months of 2021. Nearly one-third of employees who reported such incidents indicated their business lost a client or customer due to the error.

In December 2023, Proofpoint, a leading cybersecurity and compliance company, acquired Tessian. The acquisition aimed to combine Proofpoint's threat and data loss protection technology with Tessian's AI-powered behavioral and dynamic detection capabilities. This integration was expected to provide organizations with a comprehensive defense against human-targeted threats and prevent data loss across various collaboration channels.