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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, MA, US
Employee Ratings4.8

Latest Updates

Employees (est.) (Jan 2021)53(+9%)
Cybersecurity ratingCMore

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, MA, US (HQ)
260 Charles St #300
Waltham, MA, 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

2 years 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

Wrap-Up: Preventing Phishing Scams in the New Perimeter-Less World

In Case You Missed It Paul Asadoorian, Matt Alderman and Kevin O’Brien discuss how phishing scams have hit the healthcare industry. People have learned to live differently during this pandemic, which causes more users to become vulnerable. The problem with data breaches nowadays is that it can prey …

Webinar Wrap-up: 5 Cyber Threats to Prepare for in 2021

When the COVID-19 pandemic hit in early 2020, life changed for a long time, especially in the way we work. Though working from home is not a new practice, it has become the new normal. The increase in remote work has led to increased cyber threats against businesses of all sizes and industries. Remo…

Top 4 Cybersecurity Risks for Remote Education

Remote learning, communication, and collaboration solutions have emerged as the key drivers of the now quarantine economy. With solutions such as Zoom witnessing rapid adoption across the board – from educational institutions, to organizations, and government agencies – cyber risks associated with v…

Best Practices for Securing PII in Ecommerce and Delivery Services

The last thing that customers ever want to experience is an order error from Postmates. Meal delivery services such as DoorDash, Postmates and Uber Eats are  easy targets for spoofing attacks. They consist of an immense amount of personally identifiable information (PII) and payment information. Bas…

Panel Wrap Up: Building and Managing an Effective Incident Response Process

When it comes to cybersecurity, it is not a question of if there will be an attack but of when. An incident response plan is a vital part of successful business operations as it helps to decrease risks and mitigate damages. In this panel recording by Dark Reading, you will hear from some experts in …

Phishing Attack Impersonating AMEX’s Using Google Forms: What Is It and What You Should Know

With the holidays just around the corner, more impersonation attacks are targeting users. In fact, brand impersonations are 83% of spear phishing attacks. Cyberattacks have become more subtle. As we embark on the holiday season, the GreatHorn Threat Intelligence Team found a clear example of a phish…
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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 53 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.