How much funding has Theori raised?

Theori has raised $17.3M in total funding. Their latest funding round was Series A. Key investors include K2G Fund (Asia2G Capital); Dunamu (두나무); NAVER D2 Startup Factory.

Where is Theori headquartered?

Theori is headquartered in Austin, Texas, United States (HQ); Seoul, South Korea (R&D). The company has a team of 51-200 people.

Theori operates in the AI in Cybersecurity sector. Offensive cybersecurity company building AI-powered security testing solutions, founded by world-class white-hat hackers with record DEF CON wins AI-powered offensive security that combines world-class hacker expertise with autonomous AI agents (Xint, Xint Code) to find vulnerabilities faster and more accurately than traditional pentesting or scanners

When was Theori founded?

Theori was founded in 2016. It is based in Austin, Texas, United States (HQ); Seoul, South Korea (R&D).

How much funding has Theori raised?

Theori has raised $17.3M in total funding. Key investors include K2G Fund (Asia2G Capital); Dunamu (두나무); NAVER D2 Startup Factory.

Who is the CEO of Theori?

Brian (Se-jun) Pak is the CEO of Theori. The company was founded in 2016.

Where is Theori located?

Theori is headquartered in Austin, Texas, United States (HQ); Seoul, South Korea (R&D).

What funding stage is Theori at?

Theori is currently at the Growth Stage stage.

How many employees does Theori have?

Theori has approximately 51-200 employees.

Theori

Category: AI in Cybersecurity

Offensive cybersecurity company building AI-powered security testing solutions, founded by world-class white-hat hackers with record DEF CON wins Theori was founded in 2016. The company is led by Brian (Se-jun) Pak. Based in Austin, Texas, United States (HQ); Seoul, South Korea (R&D). Team size: 51-200. Total funding raised: $17.3M. Latest round: Series A. Key investors include K2G Fund (Asia2G Capital); Dunamu (두나무); NAVER D2 Startup Factory.

Founded: 2016
Headquarters: Austin, Texas, United States (HQ); Seoul, South Korea (R&D)
Team size: 51-200
Total funding: $17.3M

Value proposition

AI-powered offensive security that combines world-class hacker expertise with autonomous AI agents (Xint, Xint Code) to find vulnerabilities faster and more accurately than traditional pentesting or scanners

Products and solutions

Xint (AI-powered application security testing / AI hacker SaaS); Xint Code (LLM-native SAST for large-scale code analysis); αprism (LLM Guard & Monitoring); Dreamhack (cybersecurity education platform, 60K+ members); Dreamhack Enterprise (corporate training); Offensive Security Consulting; AI Red Teaming; ChainLight (blockchain security); Fermium-252 (threat intelligence); PatchDay (bug bounty platform)

Unique value

Only company combining 9x DEF CON winning hacker expertise with proprietary AI agents (Xint/Xint Code) that autonomously discover zero-day vulnerabilities — proven by discovering CVE-2026-31431 (Copy Fail) Linux kernel vulnerability in ~1 hour using AI

Target customer

Global enterprises, technology companies, financial institutions, blockchain/crypto firms, government agencies, and defense organizations needing advanced security testing and vulnerability discovery

Industries served

Cybersecurity, Technology, Finance/Fintech, Blockchain/Crypto, Telecommunications, Government/Defense, Cloud Infrastructure

Technology advantage

World's most decorated competitive hacking team (9x DEF CON wins, 70+ international CTF wins); AI models trained on elite hacker knowledge; Xint Code can analyze millions of lines of code in <12 hours; Top-3 in DARPA AIxCC (AI Cyber Challenge); autonomous vulnerability discovery with human-level business logic understanding

How they differentiate

Unlike traditional pentesting firms or bug bounty platforms, Theori combines elite hacker talent (9x DEF CON winners) with proprietary AI agents that autonomously discover vulnerabilities at scale. Xint Code is an LLM-native SAST that analyzes millions of lines of code in hours, not weeks, and finds business logic flaws that traditional scanners miss. The company has proven its AI can discover critical zero-days like CVE-2026-31431 (Copy Fail) in the Linux kernel.

Main competitors

HackerOne; Bugcrowd; Pentera; CrowdStrike; Synack

Key partnerships

Okta (strategic cybersecurity partnership); POSCO DX (AI-driven security framework); Samsung Electronics (Xint customer); Microsoft (Windows OS security verification); Google (Chrome vulnerability discovery); NAVER; Dunamu (두나무); LucentBloc; LG Electronics; Toss (토스)

Notable customers

Samsung Electronics; Microsoft; Google; Okta; NAVER; Dunamu; Toss; LG Electronics; POSCO DX; Hyundai Mobis; Ministry of National Defense (South Korea); US Defense research institutes

Major milestones

2016: Company founded in Austin, TX; 2017: Theori Korea established; 2018: NAVER D2 Startup Factory investment; 2020: Dreamhack cybersecurity education platform launched; 2022: $15.5M seed round led by K2G Fund; 2024: DARPA AIxCC semifinal winner; Presidential Commendation from South Korea; 2025: Xint AI hacker launched; αprism beta; Okta partnership; 2026: Xint Code launched; CVE-2026-31431 'Copy Fail' Linux kernel zero-day discovered using Xint Code

Growth metrics

87 employees (2026-03, Korea entity); 100+ total (2025); 60K+ Dreamhack members; 100+ enterprise clients globally; 150+ vulnerabilities found by Xint in beta

Market positioning

Premium offensive security provider bridging elite human hacking expertise with AI automation; positioned as a high-end alternative to both traditional pentesting consultancies and automated scanners; expanding from consulting to SaaS product model with Xint and Xint Code

Geographic focus

Global (HQ in Austin, TX; major R&D in Seoul, Korea); targeting North American and Asian enterprise markets; 2026 focus on North America expansion

Patents and IP

1 patent filed (2025-06-09, Korea); ISO/IEC 27001:2022 certified

About Brian (Se-jun) Pak

Ex-Kaprica Security Co-founder; Ex-Lockheed Martin Intern; Carnegie Mellon University BS/MS Computer Science; DEF CON record 9x winner; Founded PPP (Plaid Parliament of Pwning) hacking team at CMU

Official website: https://theori.io