GreatHorn is a new kind of security platform that prevents email-based attacks by automatically helping recipients understand whether an email they just received is safe. The Company plugs directly into today's major email providers like Google Apps and Office 365, and in real-time, analyzes every message for both externally observable indicators of a threat as well as indicators that only GreatHorn can see. GreatHorn’s Policy Engine protects against common message-based attacks immediately upon deployment. 

Belmont, US
Size (employees)
23 (est)
Greathorn was founded in 2015 and is headquartered in Belmont, US
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Key People/Management at Greathorn

Kevin O’Brien

Kevin O’Brien

CEO and Co-Founder
Raymond Wallace

Raymond Wallace

CTO and Co-Founder
Christopher Fraser

Christopher Fraser

Vice President, Strategic Accounts

Greathorn Office Locations

Greathorn has an office in Belmont
Belmont, US (HQ)
116 Beech St
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Greathorn Financials and Metrics

Summary Metrics

Founding Date


Total Funding

$8.8 m

Latest funding size

$6.30 m

Time since last funding

10 months ago


Greathorn's latest funding round in June 2017 was reported to be $6.3 m. In total, Greathorn has raised $8.8 m
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