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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.) (Apr 2021)51(+5%)
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

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…

Millions of BEC Phishing Attacks Using Return Path

Many organizations, across many supply chains, use Amazon’s Simple Email Service as an inexpensive and high-scale cloud email service provider. Now, cybercriminals are using return-path features provided by this popular service in order to quickly and effectively bypass traditional email security ch…

Tax Season Is Phishing Season for Email Scammers

U.S. taxpayers will again get a reprieve on their April 15 tax filing deadline, this year. If historical trends are any indication, there will be no let-up on the pressure that cybercriminals put on email users each year at tax time. As if the demands of tax season weren’t enough, at this time of ye…

Malicious Payloads: Defending Your Organization Beyond “Known Bad” Lists

They’re the worst fear of IT professionals. Literally. According to a recent survey, 52% of cybersecurity pros are most concerned with malicious payloads being delivered via email, and 47% are most concerned with malicious payloads being delivered by a hyperlink within an email. There’s a good reaso…

Phishing Phails: When Cybercriminals Don’t Get It “Right”

At GreatHorn, we spend most of our time and effort on the most sophisticated email attacks that are threatening organizations and end users. We’re constantly dealing with new attacks and layering defense strategies to combat them. In our 2021 Email Security Benchmark Report, we detail how mimicking …

Phishing Attacks Trends Using ‘Vaccine’ Keyword

Nobody expects scruples from an email phishing attacker. So, it should come as no surprise that these cybercriminals are using the COVID-19 vaccine, a source of hope and maybe even desperate need for millions, as a hook to worm their way into organizations’ systems. Cybercriminals often prey on the …
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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.