Hack The Box

Hack The Box is the leading cyber readiness platform for the agentic era, battle-testing and upskilling both humans & AI agents to enhance organizational cyber resilience.

AI agents Cybersecurity Developer tools and cloud

Latest funding

$55M Series B+ · February 19, 2023

Led by The Carlyle Group · Source: fundraisingfox.com

Total raised: $66.95M across 3 sourced rounds

All 3 rounds ↓

Website: hackthebox.com.

X: @hackthebox_eu · 253,600 followers.

LinkedIn: linkedin.com.

Categories: AI agents Cybersecurity Developer tools and cloud.

Sectors: Artificial Intelligence (AI), Cyber Security, Information Technology, Penetration Testing, Skill Assessment.

Stage: Series B+.

Based in: Folkestone, United Kingdom.

Founded: 2017.

Total raised: $66.95M in 3 sourced rounds.

Last round: Feb 19, 2023 · 1,362 days ago.

Headcount: 101–250 employees.

On Recent Funding since: Nov 8, 2026.

Signals

X account@hackthebox_eu · created May 2, 2017 (9 years old) · 253,600 followers

Website registeredMar 18, 2010 (16 years old)

TIMELINE · MONEY RAISED

Hack The Box | 699 days from X account to first raise on record

@hackthebox_eu·Raised $67M in 3 sourced rounds·1 signal before the first raise

Money raised, round by round (amounts linked to their source). Pins are dated signals; hover the icons for dates.

Funding rounds

February 19, 2023
Series B+ · $55M
TThe Carlyle Group (lead), BBrighteye Ventures, EEndeavor Catalyst, MMarathon Venture Capital, OOUP (Osage University Partners), PPaladin
Source: fundraisingfox.com
April 12, 2021
Series A · $10.59M
PPaladin (lead), BBrighteye Ventures, MMarathon Venture Capital, OOUP (Osage University Partners)
Source: UK Tech Investment News
April 1, 2019
Seed · $1.35M
Source: UK Tech Investment News
May 2, 2017
X account created
March 18, 2010
Website created

Founders and team

HP
Haris Pylarinos Founder & CEO

@hpylarinos · LinkedIn · source: hackthebox.com
AZ
Aris Zikopoulos Founder

LinkedIn
JH
James Hooker Founder

LinkedIn
GW
Gibb Witham President

Acquisitions

Acquired company	Price	Announced
LLetsDefend	Not disclosed publicly	Sep 17, 2025

Investors

Companies like Hack The Box

CCymulate$70M Series B+ · Sep 2022
FFiligran$58M Series B+ · Oct 2025
DDetectify$1.64M Series A · Mar 2015
CControl Monkey$7M Seed · Jan 2025
SSeldon$20M Series B+ · Mar 2023
BBlackpanda$6.7M Series A · Sep 2024

Other companies backed by The Carlyle Group

CCAIS$170M Series B+ · Jul 2026
CChronograph$140M Series A · Jun 2026
SSESAMm$37M Series B+ · Mar 2023
CCohesitySeries B+ · May 2026
99finSeries B+ · Apr 2026

The Carlyle Group portfolio →

Sources and API

Every amount links to the page it came from. * Estimated from an accelerator's published standard deal, not a company-specific disclosure. How Recent Funding sources and verifies funding data. The same data as JSON: /api/v1/companies/hack-the-box (get a free API key).