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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 Ratings4.8

Latest Updates

Employees (est.) (Sept 2020)51
Cybersecurity ratingBMore

Key People/Management at GreatHorn

Kevin O'Brien

Kevin O'Brien

CEO & Co-Founder
Raymond Wallace

Raymond Wallace

CTO and Co-Founder
James Luciani

James Luciani

Vice President, Engineering
Michael Mayer

Michael Mayer

Vice President, Sales
Ann Sharon

Ann Sharon

Vice President, Operations
Matt Petrosky

Matt Petrosky

Vice President, Customer Experience
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GreatHorn Office Locations

GreatHorn has an office in Waltham
Waltham, US (HQ)
260 Charles St #300
Waltham, US
1075 Main St #210
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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

a year 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 Cybersecurity Score

Cybersecurity ratingPremium dataset



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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

GreatHorn Strengthens Email Security Offering With Fully Integrated Platform Capabilities

Enhancements to leading platform allow for greater visibility to detect and respond to increasingly sophisticated threats WALTHAM, MA– August 11, 2020 – Today, cloud-native email security solution GreatHorn announced the launch of the company’s most substantial and comprehensive platform update yet.…

2020 Email Security Benchmark Report: Response Phishing Attacks

2020 Email Security Benchmark: How Organizations Are Responding to More Frequent and Sophisticated Phishing Attacks At GreatHorn, we have a 30,000-foot view of the email phishing threat landscape. That enables us to see hotspots like a recent spate of coronavirus-themed phishing emails hitting inbox…

GreatHorn Annual Survey Report, 2020

Email Impersonations Are Bombarding Inboxes, Targeting an Increasingly Distracted and Dispersed Workforce New research from GreatHorn details a sharp spike in the need for remediation, with over a third of respondents seeing email-based attacks land in their inbox on a daily basis Waltham, MA – July…

Phishing Attacks: How a COVID-19 Attack is Interconnected to Other Attacks

Times of change are also times of opportunity. This is true for most businesses, and it is also true for cyber criminals.We’ve written previously about how the good habits built up by people in your organization–opening urgent-seeming attachments, responding quickly with information requested by a s…

Discussing Corporate Maturity to Evaluate Security Vendors

This is the fifth in our five-part series evaluating anti-phishing tools. To start at the beginning, read Automated phishing response tools: 4 things to consider” In previous blogs we highlighted the 4 things to consider when assessing automated phishing response tools. And, discussed in-depth, the …

How to Detect Risky URLs in Your Email: Top 3 Things to Check

The post How to Detect Risky URLs in Your Email: Top 3 Things to Check appeared first on GreatHorn.
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GreatHorn Frequently Asked Questions

  • When was GreatHorn founded?

    GreatHorn was founded in 2015.

  • Who are GreatHorn key executives?

    GreatHorn's key executives are Kevin O'Brien, Raymond Wallace and James Luciani.

  • How many employees does GreatHorn have?

    GreatHorn has 51 employees.

  • Who are GreatHorn competitors?

    Competitors of GreatHorn include Exabeam, Uplevel Security and Claroty.

  • 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 2 offices.