Horizon3.ai
Horizon3.ai sells AI-powered cybersecurity testing tools that simulate attacks to find vulnerabilities, with 526 employees and $429M in total funding. Its NodeZero platform has run over 225,000 security tests.
The growth story
Horizon3.ai grew from 42 to 526 employees between 2021 and 2026, raising $429M along the way, most recently a Series E in August 2026.
About
Horizon3.ai makes software that automatically probes corporate defenses by mimicking hacker tactics, helping security teams find and fix weaknesses before real attackers exploit them. Customers use it to validate their resilience against AI-driven threats.
The company reached Series E funding in 2026 and draws talent heavily from cybersecurity firms like Palo Alto Networks (30 hires) and SentinelOne (24). Its 526-person workforce suggests rapid scaling, though median tenure is just one year.
Founders and leadership
Sales is the largest department with 153 staff, indicating a product-led growth strategy. Leadership includes U.S. cyber veterans who built the NodeZero platform.
The Horizon3.ai org chart
Snehal Antani (Co-Founder & CEO) leads 59 mapped leaders with 8 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Sales 183 (+115% YoY), Engineering 109 (+98% YoY), Information Technology 30 (+88% YoY), Human Resources 26 (+136% YoY), Business Development 25 (+32% YoY), Marketing 25 (+127% YoY).
Talent flow
One-third of analyzed hires came from six cybersecurity vendors, led by Palo Alto Networks. Alumni frequently join smaller security startups like Finite State (5) and Axonius (2).
Most common previous employers of Horizon3.ai staff: Palo Alto Networks (30), SentinelOne (24), Cisco (17), Exabeam (14), Forescout Technologies (13), FireEye (12). Former Horizon3.ai employees most often moved to Finite State (5), Suzu Labs (2), Axonius (2), Terra Security (2), TrendAI (2), Lema AI (2).
Alumni worth knowing
The Horizon3.ai mafia
Five alumni-founded companies exist, including Cosmonic (9 staff) and Cadence Talent. All are early-stage with single-digit headcounts.
5Liam Randall, was Seed Investor until 2020Tyler Leone, was Talent until 2025Alex Cannon, was Global Manager, SDR Program until 2022Ricardo Madan, was Business Development until 2025Pearse Swail, was Attack Engineer until 2026Hiring now
Web traffic
Traffic mix: 62% direct, 20% search, 11% social, 1% paid.
What this company is made of
Most common skills at Horizon3.ai: Leadership (237), Sales (187), Management (186), Microsoft Office (173), Customer Service (153), Communication (144), Software as a Service (SaaS) (140), Cybersecurity (140).
Where the team actually sits
Horizon3.ai people are concentrated in California, United States (37), Illinois, United States (27), Texas, United States (27), North Carolina, United States (23).
Search footprint
Horizon3.ai attracts about 1,171 organic search visits a month, traffic worth roughly $32K a month if bought through ads. It gained 403 ranking keywords and lost 342 in the last period.
What employees say
- Compensation
- 4.70 / 5
- Career opportunities
- 4.80 / 5
- Senior management
- 4.90 / 5
- Work-life balance
- 4.60 / 5
Frequently asked
Horizon3.ai has 526 employees as of September 2026.
Horizon3.ai has raised $429M in total, most recently a Series E round in August 2026.
Horizon3.ai was founded in 2019 by Snehal Antani, Anthony Pillitiere.
Snehal Antani (Co-Founder & CEO) sits at the top of Horizon3.ai's reporting structure, with 8 direct reports.
The most common previous employers of current Horizon3.ai staff are Palo Alto Networks (30 people), SentinelOne (24 people), Cisco (17 people).
Former Horizon3.ai employees most often move to Finite State (5), Suzu Labs (2), Axonius (2).
At least 5 companies have a founder who previously worked at Horizon3.ai, including Cosmonic, Cadence Talent, ToFA Publications.
Horizon3.ai attracts about 1,171 organic search visits a month, worth roughly $32K a month in equivalent ad spend.
The most common skills among Horizon3.ai staff are Leadership, Sales, Management, Microsoft Office, Customer Service.
Horizon3.ai staff are concentrated in California, United States (37), Illinois, United States (27), Texas, United States (27).
Horizon3.ai has about 183 people in Sales, up 115% over the past year, as of September 2026.
Horizon3.ai has about 109 people in Engineering, up 98% over the past year, as of September 2026.
Computed from 482 current and 162 former Horizon3.ai profiles, as of September 2026. Source: Crustdata.
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