Updated Apr 23, 2026
Score 32
Tessian logo

Tessian

Ranked #369 of 1,000+ cybersecurity companies
Profile
░
INITIALIZING DATA STREAM...

Overview

Acquired By
Proofpoint
Legal Name
Tessian Limited
Founded
2013
Crunchbase Rank
#80029
Also Known As
Quiver, Quiver Software, Quiver Software Limited, CheckRecipient, CheckRecipient Limited, Tessian Inc

Cloud Email Security that intelligently prevents advanced email threats and protects against data loss

Tessian, acquired by Proofpoint, is a human-layer cloud email security platform that uses machine learning and behavioral data science to automatically prevent phishing, business email compromise, insider/exfiltration, and accidental data loss, coaching users in the moment to strengthen security with minimal disruption.

Industries
Computer and Network Security
Type
Privately Held

Company Size

Employees
 
42
Range11–50 employees
110K+

Affiliated Organizations

ProofpointAffiliate

Headquarters

Boston, MA

Followers

 
21,204

Press Coverage

DateArticlePublisher
May 22, 2025These 12 NYC Cybersecurity Companies Are Protecting the World’s DataBuilt In
Jan 11, 2024Proofpoint acquires Tessian to bolster AI-driven cybersecurity defencesSecurityBrief New Zealand
Jan 11, 2024Proofpoint acquires Tessian to bolster AI-driven cybersecurity defencesSecurityBrief New Zealand
Dec 20, 2023Proofpoint closes acquisition of Tessian FeaturedITWire
Dec 19, 2023Proofpoint Closes Acquisition of TessianTradingView
Nov 22, 2023Proofpoint To Acquire Email Security Company TessianCRN
Oct 30, 2023Proofpoint to Acquire Tessian for AI-Powered Email Security TechSecurity Week
Oct 30, 2023Proofpoint To Acquire Email Security Company TessianCRN
Oct 30, 2023Cyber consolidation: SailPoint closes Osirium acquisition as Proofpoint to buy TessianSilicon Angle
—Cybersecurity Companies—

1–10 of 14

Specialties

Cyber SecurityData Loss PreventionInformation SecurityMachine LearningArtificial IntelligenceSpear Phishing

Categories

Artificial Intelligence (AI)Cyber SecurityEmailMachine LearningProfessional Services

Event Appearances

8 events · 4 sponsor · 4 exhibitor
RSA Conference 2023
Apr 24, 2023·Exhibitor
RSA Conference 2023
Apr 24, 2023·Sponsor
RSA Conference 2022
Jun 6, 2022·Sponsor
RSA Conference 2020
Feb 24, 2020·Exhibitor
SecurIT Chicago
Nov 6, 2019·Sponsor
Digital Transformation EXPO Europe 2019
Oct 9, 2019·Exhibitor
ILTACON 2019
Aug 18, 2019·Exhibitor
Black Hat USA 2019
Aug 3, 2019·Sponsor

Product

NameDescription
Email Threat DefenseAI-based email security that detects and prevents advanced phishing attacks and email threats such as BEC, ATO, and impersonation.
Email Exfiltration ProtectionAI-driven detection and prevention of unauthorized data exfiltration via email using behavioral and content analysis.
Email Misdelivery ProtectionMachine learning-based detection and prevention of accidental or misdirected email data loss through recipient and content analysis.
Investigation and Response (I&R)A platform for fast search, investigation, and automated remediation of email threats and incidents.
In-the-Moment CoachingContextual user warnings that educate employees on email risks to improve security decision-making in real time.