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GreatHorn
Cybersecurity · Waltham, United States · Founded 2015
Cybersecurity platform that detects and prevents spear phishing attacks and credential theft in cloud and on-premise infrastructure. Techstars '15. MoreLess
GreatHorn operates in the cybersecurity market, focusing on advanced email security solutions. The company serves mid to large-sized enterprises, particularly those with over 250 users, providing tools to detect and respond to Business Email Compromise (BEC) and sophisticated phishing attacks. GreatHorn's business model revolves around a subscription-based service, offering a risk-free trial period to attract new clients. The platform uses machine vision to analyze URLs for anomalous content and provides educational smart banners and links to help users understand and mitigate risks. Revenue is generated through subscription fees for its API-based solution, which combines powerful threat analysis with user-friendly features. The company aims to reduce remediation time and improve overall email security for its clients. Keywords: email security, BEC detection, phishing prevention, machine vision, enterprise solutions, API-based, threat analysis, educational tools, subscription model, cybersecurity.
Company overview
GreatHorn company information
The essential company record, classifications and operating signals in one place.
- Status
- Operational
- Founded
- 2015
- Headquarters
- Waltham, United States
- Employees
- 7
- Open positions
- None listed
- Dealroom signal
- 65.5
Valuation & funding
GreatHorn funding history
Company financing events and reported valuations.
| Deal type | Date | Amount | Valuation | Investors | Source |
|---|---|---|---|---|---|
| EARLY VC✓Equity / VC | Jun 2019 | $13M | $52M | Uncork Capital · V1.vc · .406 Ventures · Techstars | — |
| SERIES A✓Equity / VC | Jun 2017 | $6.3M | $25M | ff Venture Capital · Uncork Capital · RRE Ventures · .406 Ventures | — |
| SEED✓Equity / VC | Mar 2016 | $2.3M | $9M | Techstars · ff Venture Capital · RRE Ventures · Zelkova Ventures | — |
| CONVERTIBLE✓Equity / VC | Sep 2015 | $280K | — | Undisclosed | — |
Financials
Workforce over time
Available workforce history. Financial fields without reported data are omitted.
| Year | Employees |
|---|---|
| 2026 | 7 |
| 2025 | 9 |
| 2024 | 11 |
| 2023 | 25 |
| 2022 | 39 |
| 2021 | 41 |
| 2020 | 54 |
Growth signals
GreatHorn website traffic
Latest recorded traffic for GreatHorn is 3.4K monthly website visits, down 5.6% over the last three months. GreatHorn's team declined 22.2% over the past year.
Comparisons
GreatHorn compared with similar companies
Dealroom’s weighted taxonomy model identifies the closest operating peers. Company identity and context stay open; selected comparison metrics preview what is available in the platform.
| Company | Headquarters | Status | Employees | Total funding | Valuation |
|---|---|---|---|---|---|
 GreyCortexAdvanced network traffic analysis |
Brno, Czechia | Operational | 49 | $1.3M | $5.3M |
 AmpliphaeSaaS management and encryption intelligence platform |
Belfast, United Kingdom | Operational | |||
 IntersetEnterprise Threat Detection Through Behavioral Analytics |
Ottawa, Canada | Acquired | |||
 Recorded FutureA complete threat intelligence solution powered by patented machine learning to lower risk |
Somerville, United States | Acquired | |||
 FortscaleThe innovator in machine learning-based User and entity behavior analytics (UEBA) for security |
Tel Aviv-Yafo, Israel | Acquired | |||
 CyberliticaCyberlitica’s new Dark Web Workforce-Threat Intelligence Audit identifies employee risk from where it originates… on the Dark Web |
New York City, United States | Operational | |||
 Rapid7Provider of cyber security solutions |
Boston, United States | Operational | |||
 Venari SecurityMaking today's encrypted world more secure and compliant | Venari Security |
London, United Kingdom | Operational |
Talent graph
GreatHorn's talent
Source: Dealroom Talent Intelligence.
Global footprint
Where GreatHorn has talent and traffic
team presence
In the news
Latest news about GreatHorn
Recent press, funding announcements, and product moves mentioning GreatHorn — open to read from the original sources.
Market sentiment
What the market is saying about GreatHorn
An AI-synthesized read of the highest-engagement posts about GreatHorn on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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