Tessian Limited

Founded in 2013 and based in London, the UK, Tessian Limited, formerly known as CheckRecipient, operates a security platform that uses machine learning to analyze historical email data and identify anomalies on outgoing emails. Edward Bishop, Thomas Adams, Tim Sadler are the co-founders of the company. In August 2021, the firm raised approximately USD 9 million in Series C funding from Citi Ventures, Okta Ventures, and Sozo Ventures. The company's products include Tessian Defender, Guardian, Enforcer, and Constructor.

Tessian Defender is a comprehensive inbound email security solution that automatically prevents a wide range of attacks that bypass secure email gateways while providing in-the-moment training to drive employees toward secure email behavior. Tessian Guardian automatically prevents accidental data loss caused by misdirected emails and misattached files on email. Tessian Enforcer automatically prevents data exfiltration over email. In 2020, the firm generated GBP 8.

9 million in revenue. Tessian will use the August 2021 funding to expand its platform’s capabilities beyond email, securing other interfaces like messaging, web, and collaboration platforms from incidents of human error.