GreatHorn
Track on RadarAcquired by SF2 GH Holdings · 2022 · news
Cloud-native email security for Office 365 and G Suite environments
- Total raised
- $21.93M
- Employees
- 7
- Founded
- 2015
- Momentum
- 26
Stalling
Data updated July 2026
About
About GreatHorn
At a glance
GreatHorn is a cybersecurity company specializing in Email & Messaging Security, founded in 2015 and headquartered in Waltham, United States. It has raised $21.93M in total funding, employs about 7 people, and was acquired by SF2 GH Holdings in 2022.
GreatHorn provides cloud-native email security solutions designed specifically for organizations using Office 365 and G Suite (Google Workspace). The company's platform protects against targeted phishing attacks, business email compromise (BEC), malware, and ransomware through a combination of machine learning, automation, and behavioral analysis. The platform operates without requiring mail routing or network-level changes, using OAuth-based access provisioning to integrate with cloud email systems. GreatHorn analyzes email content in memory within containerized cloud environments, evaluating hundreds of risk factors including relationships, communication patterns, and technical fingerprints. The system automatically adapts to each organization's unique environment and communication behaviors. GreatHorn's approach encompasses protection at three stages: before attacks reach users (perimeter), during user engagement (point of interaction), and after incidents occur (remediation). The platform includes threat detection capabilities, user engagement tools, and integrated email remediation features. The company emphasizes empowering employees to identify threats by providing contextual information alongside automated protection. The company was founded by cybersecurity veterans with backgrounds at organizations including @stake, CloudLock, Conjur, and Courion. GreatHorn maintains SOC 2 Type 2 certification and Cloud Security Alliance STAR certification. The platform's threat intelligence is built from analysis of hundreds of millions of email threats, with all end-user data anonymized and client-identifiable metadata stored in single-tenant databases.
Momentum
How GreatHorn is trending
Momentum score
Score history appears once we have at least two monthly snapshots.
Pillar breakdown
Pillar breakdown locked
Growth, Market & Financial sub-scores
Valuation
What GreatHorn is worth
Estimated valuation
Funding
Funding history
See every round, lead investor, and the full capital stack.
Open the full profile on Mandos to see funding history.
Public markets
Stock performance
Privately held
This company isn't publicly traded. Stock performance will appear here after an IPO.
Headcount
Headcount growth
Track hiring velocity, department mix, and seniority shifts.
Open the full profile on Mandos to see headcount growth.
Jobs
Open jobs
Every live posting, hiring pace, and role-level signal.
Open the full profile on Mandos to see open jobs.
Web traffic
Digital presence
Visits trend, bounce rate, engagement, and top countries.
Open the full profile on Mandos to see digital presence.
Tech stack
Technologies
The full stack behind the product — frameworks, clouds, security.
Open the full profile on Mandos to see technologies.
M&A
Acquisitions
Every acquisition this company has made, with dates and amounts.
Open the full profile on Mandos to see acquisitions.
Reviews & sentiment
Employee & product reviews
CEO approval, culture, comp, and detailed product ratings.
Open the full profile on Mandos to see employee & product reviews.
Leadership
Full leadership team
CEO, CxOs, VPs, and every exec with roles.
Open the full profile on Mandos to see full leadership team.
Competitors
Competitive landscape
The complete competitor set with overlap and positioning.
Open the full profile on Mandos to see competitive landscape.
News
Press & news coverage
The most recent mentions, announcements, and media coverage.
Open the full profile on Mandos to see press & news coverage.
Full profile
This public profile is a snapshot
The full Mandos profile of GreatHornadds funding rounds & investors, valuation estimates, headcount & hiring trends, technology stack, executive moves, and real-time monitoring.
FAQ
Frequently asked questions about GreatHorn
When was GreatHorn founded?▾
GreatHorn was founded in 2015.
Where is GreatHorn headquartered?▾
GreatHorn is headquartered in Waltham, United States.
How much funding has GreatHorn raised?▾
GreatHorn has raised a total of $21.93M in total funding.
Is GreatHorn public or private?▾
GreatHorn is a privately-held company.
How many employees does GreatHorn have?▾
GreatHorn has approximately 7 employees.