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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.) (Sept 2021)50
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, 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

Google and Open Redirects: Preventing Your Users from Becoming a Victim of Attacks

The GreatHorn Intelligence Team has identified an increase of 84% in phishing attacks leveraging Google’s open redirects using Google Meet and Google DoubleClick between Q1 2021 and Q2 2021. The use of the open redirects on these platforms allows for threat actors to evade detection by most email se…

Supply Chain Attacks: How to Defend Against Vendor Email Compromise

The GreatHorn Threat Intelligence Team, alongside hundreds of responses from IT security professionals, report 58% of organizations have experienced an attempted Supply Chain Attack in the past year. One of the largest attack techniques used in Supply Chain Attacks is a form of man-in-the-middle (Mi…

Bitcoin and Cryptocurrency: 2021 Email Extortion Trends

What are cryptocurrencies? Cryptocurrencies move over decentralized networks, with each computer (or “node”) that plugs into the network acting to validate transactions. That gives them the ability to facilitate transfers of money without a bank or money transmitter in between to say who gets to use…

OnlyScams: New GreatHorn Phishing Data Shows a Surge in X-Rated Attacks

Phishers exploit human nature, taking advantage of individuals, combining social psychology, technical systems, security subjects and politics. Call it what you will: business email compromise (BEC), phishing, spearphishing or whaling, all email-based cyberattacks have one thing in common: they use …

How Much Risk Is Already in Your Email Environment?

Today, most IT professionals understand that it’s impossible to stop every attack. That’s led to a more nuanced understanding of diagnosing and mitigating attacks at points inside and outside an organization’s security defenses. Email is no different. Roughly 306.4 billion emails are sent each day, …

Microsoft 365: You’ve Migrated, So What Can You Optimize?

Over the years, Microsoft has made its cloud offerings more attractive, motivating more and more businesses to make the migration from on-premise Microsoft Exchange email servers to cloud-hosted Microsoft 365. This includes improvements to email security functionality: features not available with Mi…
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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 50 employees.

  • Who are GreatHorn competitors?

    Competitors of GreatHorn include Anjuna, Phylum and Exabeam.

  • 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.