London - based Tessian has reportedly raised around $ 40 m in a series B funding round led by Silicon Valley 's Sequoia Capital , according to multiple sources . The start - up provides AI - based email security services that use machine learning to study a company ’s email networks and identify unusual behaviours in outgoing email . Tessian is also focused on the security of incoming email . The company raised $ 13 m in series A funding seven months ago , led by angel Capital , with additional investors including Accel , Amadeus Capital partners , Crane , LocalGlobe , Winton Ventures and Walking Ventures .
London-based Tessian has reportedly raised around $40m in a series B funding round led by Silicon Valley's Sequoia Capital, according to multiple sources. The start-up provides AI-based email security services that use machine learning to study a company’s email networks and identify unusual behaviours in outgoing email. Tessian is also working on the security of incoming email. The company raised $13m in series A funding seven months ago, led by Balderton Capital, with additional investors including Accel, Amadeus Capital Partners, Crane, LocalGlobe, Winton Ventures and Walking Ventures.