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GreatHorn develops a cyber security platform designed to prevent phishing attacks for cloud-based communication platforms. The Company's platform provides enterprises with comprehensive, cloud-native protection against message-based threats, driven by machine learning and automated response capabilities, enabling organizations to secure their communications across multiple channels.
HQWaltham, US
Employee Ratings5

Latest Updates

Employees (est.) (Nov 2019)45

Key People/Management at GreatHorn

Kevin OBrien

Kevin OBrien

CEO & Co-Founder
Raymond Wallace

Raymond Wallace

CTO & Co-Founder
Ann Sharon

Ann Sharon

Vice President, Operations
Kurt Johnson

Kurt Johnson

Vice President, Business Development
Dave Magnusson

Dave Magnusson

Vice President, Sales
Lorita Ba

Lorita Ba

Vice President, Marketing
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GreatHorn Office Locations

GreatHorn has an office in Waltham
Waltham, US (HQ)
260 Charles St #300
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GreatHorn Financials and Metrics

Summary Metrics

Founding Date


GreatHorn total Funding

$21.8 m

GreatHorn latest funding size

$13 m

Time since last funding

5 months ago

GreatHorn investors

GreatHorn's latest funding round in June 2019 was reported to be $13 m. In total, GreatHorn has raised $21.8 m
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GreatHorn Online and Social Media Presence

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GreatHorn News and Updates

Cloud email cybersecurity startup GreatHorn raises $13M

Cloud email cybersecurity startup GreatHorn Inc. today said it has raised $13 million in new funding to expand its existing services in email security. The Series B round was co-led by RRE Ventures and .406 Ventures and included Techstars Ventures, V1.VC and Uncork Capital. Including the new fundin…

GreatHorn takes in $13 mln

Waltham, Massachusetts-based GreatHorn, an email security platform provider, has secured $13 million in funding. The lead investors were RRE Ventures and .406 Ventures.

GreatHorn nabs $13 million for cloud-hosted email security software

Cloud-hosted email security software provider Greathorn today announced that it has raised $13 million in venture capital.

GreatHorn Swoops In From The Cloud To Stop Phishing Attacks

GreatHorn has raised $10 million in venture capital and is in its third consecutive year of triple digit revenue growth, stopping phishing attacks from the cloud.

GreatHorn Blogs

Why an API approach to securing email in the cloud is better than the secure email gateway method

The term “cloud-native” gets thrown around a lot, but in email security there are very few cloud-native solutions. It’s crucial to understand the difference between “running in the cloud” and a “cloud-native architecture.” While many secure email gateway (SEG) solutions claim to be cloud-based, the …

Phishing Emails – Explained: “Action Required – Mail Sync Error!”

This is the first in a new series of blog posts entitled, “Phishing Emails – Explained,” which breaks down real-world phishing examples and the tactics used to lure victims into interacting with the message. Phishers frequently exploit global brands like Microsoft, Dropbox, and DocuSign in their sca…

Where to Find GreatHorn This Fall

Face-to-face conversations are one of our favorite ways to really understand what’s happening in your world – the challenges at the top of your list, the attacks getting past your email security tools, the security priorities you’ve committed to. We’re doing some traveling this Fall, so it’s a great…

Lessons Learned: Helping the hospitality industry manage information security and fluctuating workforces

I recently had the opportunity to interview the Vice President of IT Jason Shane and Sr. Security Engineer Yoel Alvarez of Hersha Hospitality Management. We discussed some of their biggest challenges when it comes to information security, email security, and the natural fluctuations in a hospitality…

GreatHorn Frequently Asked Questions

  • When was GreatHorn founded?

    GreatHorn was founded in 2015.

  • Who are GreatHorn key executives?

    GreatHorn's key executives are Kevin OBrien, Raymond Wallace and Ann Sharon.

  • How many employees does GreatHorn have?

    GreatHorn has 45 employees.

  • Who are GreatHorn competitors?

    Competitors of GreatHorn include Exabeam, RedLock and Uplevel Security.

  • Where is GreatHorn headquarters?

    GreatHorn headquarters is located at 260 Charles St #300, Waltham.

  • Where are GreatHorn offices?

    GreatHorn has an office in Waltham.

  • How many offices does GreatHorn have?

    GreatHorn has 1 office.