Hack The Box
Category: AI in Cybersecurity
Cyber readiness platform that trains and measures both human cybersecurity professionals and AI security agents through hands-on labs, live-fire simulations and an AI cyber range. Hack The Box was founded in 2017. The company is led by Haris Pylarinos. Based in United Kingdom (Hack The Box Ltd); major operations in Greece. Team size: 101-500. Total funding raised: $66.9M. Latest round: Series B. Key investors include Carlyle, Paladin Capital Group, Osage University Partners, Marathon Venture Capital, Brighteye Ventures, Endeavor Catalyst.
- Founded
- 2017
- Headquarters
- United Kingdom (Hack The Box Ltd); major operations in Greece
- Team size
- 101-500
- Total funding
- $66.9M
Value proposition
Helps organizations build, assess and prove the capabilities of their human-AI cyber workforce. It offers threat-informed learning paths, real-world hacking labs, CTFs, crisis simulations, and AI Range environments for benchmarking AI security agents.
Products and solutions
HTB Enterprise Platform, HTB Academy, Hacking Labs and Pro Labs (1,500+ labs), Capture The Flag, Threat Range, Crisis Control, Talent Search and Job Board, AI Range (launched Dec 2025) and AI Range Enterprise Edition (Oct 2026), AI-augmented Pentester/SOC Analyst roles with Agentic Operator Competence Scoring, LetsDefend (blue team), Parrot OS.
Unique value
The largest gamified hacking community (4M+ members) combined with a controlled AI cyber range. Organizations can appraise AI agents against defined security job roles and score whether human operators can effectively oversee AI-driven work.
Target customer
Enterprise security teams and CISOs, SOC managers, MSSPs, government and public sector agencies, universities, frontier AI labs and hyperscalers, plus individual cybersecurity professionals.
Industries served
Cybersecurity training, Public Sector/Government, Finance, Technology, Healthcare, MSSPs, Education
Technology advantage
Large proprietary library of realistic offensive and defensive lab environments, continuously refreshed with new vulnerabilities and attack patterns. A community-driven content flywheel, plus a role-based, repeatable appraisal methodology for AI agents (Agentic Worker Competence).
How they differentiate
Gamer-first, highly realistic adversarial content backed by a 4M+ member community. It unifies red and blue team training (via the LetsDefend acquisition) and extends workforce readiness to AI agents through AI Range, which competitors largely lack.
Main competitors
TryHackMe, Immersive Labs, RangeForce (also OffSec, INE, Cyberbit)
Key partnerships
AI Range pressure-tested with AI labs, government customers and hyperscalers, recognized as a Leader in a Forrester Wave report, Parrot OS project
Notable customers
Fortune 500 companies, government agencies, MSSPs and frontier AI labs (unnamed)
Major milestones
2017 platform launch. 2019 $1.3M seed (Marathon VC). 2021 $10.6M Series A led by Paladin. 2023 $55M Series B led by Carlyle. Sep 2025 acquired LetsDefend. Dec 2025 launched AI Range. Oct 2026 launched AI Range Enterprise Edition and AI-augmented roles.
Growth metrics
4.3M platform members; 800+ enterprise customers (1.5k+ organizations trained); 300+ employees; 742 training labs; 1.2K CTFs and events supported. Grew from 1.7M members at the 2023 Series B.
Market positioning
Leading global cyber workforce development / cyber readiness platform, repositioning as the benchmark for human-AI cyber workforce competence.
Geographic focus
Global; strong traction in US, Europe and APAC
About Haris Pylarinos
Founder of Hack The Box (launched 2017); led its global expansion to 300+ employees and 4M+ platform members.
Latest news about Hack The Box
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Official website: https://www.hackthebox.com