Fastest-growing Offensive Security companies, Q3 2026

Twenty develops offensive cyber capabilities for U.S. government and allied military and intelligence customers. The company builds software platforms intended to support cyber operations at scale, automating tradecraft that was previously performed manually by cyber operators across large numbers of targets.

The founding team previously worked at Palo Alto Networks, including on the Cortex business and on the company's cyber operations capability now used by U.S. Government, Five Eyes, and NATO customers. Team members also include former U.S. Cyber Command and U.S.

Armadin is a cybersecurity company building an AI-driven platform focused on offensive security and red teaming. The company was founded by a team that includes Kevin Mandia (formerly of Mandiant/FireEye), Travis Lanham as CTO, Evan Peña as Chief Offensive Security Officer, and David Slater as Chief Architect.

• AI-driven offensive security and red teaming
• Scalable enterprise security product development
• AI-powered architecture for cybersecurity platforms

FAZE Security (formerly Cytrix) develops an offensive security orchestration platform that performs agentic, continuous red teaming across an organization's attack surface.

The platform is designed to operate across internal, external, cloud, development, staging, and production environments, and can be integrated into CI/CD pipelines.

Novee is a cybersecurity company that provides an AI-powered penetration testing platform. The platform is designed to continuously assess applications and environments by simulating real attacker behavior, uncovering vulnerabilities, exploit chains, and business logic flaws that traditional scanners and periodic manual penetration tests typically miss.

• Discover: Continuously maps the live environment by interacting with real flows, endpoints, and behaviors to identify exposed attack surfaces.
• Detect: Actively attacks applications to uncover real exploit chains, business logic flaws, and vulnerabilities beyond known CVEs.
• Validate: Confirms each finding with replication steps and real-world impact assessment to eliminate false positives.

a.security is an autonomous offensive security and remediation platform designed to help organizations identify and fix exploitable attack paths in their systems.

• Discover: Identifies and validates complete attack paths that impact the business
• Plan: Builds a prioritized attack plan targeting the most critical paths to valuable assets, with user review and approval before execution
• Exploit: Executes real-world attacks simulating adversary behavior, linking exploits into a validated kill-chain with full visibility
• Remediate: Outlines findings, applies fixes, retests, and documents results, integrating with ITSM workflows to close the loop automatically

XBOW provides AI-powered continuous offensive security testing for applications. The company was founded by the creators of GitHub Copilot and GitHub Advanced Security, bringing expertise in AI and security tooling to the penetration testing space.

The company offers automated penetration testing services that leverage artificial intelligence to continuously assess application security posture. Their approach focuses on offensive security techniques, using AI to identify and validate exploitable vulnerabilities in applications.

Terra Security provides continuous penetration testing services powered by agentic AI technology. The platform combines human security experts with AI agents to perform offensive security testing on web applications and infrastructure. Their approach involves creating custom test plans tailored to each organization's risk profile, with dedicated expert testers working alongside AI agents to conduct assessments.

RunSybil is an AI-powered offensive security platform designed to continuously test applications and infrastructure for exploitable vulnerabilities. Rather than relying on signature-based scanning, the platform uses adversarial reasoning to simulate how an attacker would approach a target system, chaining vulnerabilities across code, APIs, cloud, and infrastructure layers to surface real, exploitable attack paths.

• High-risk application security testing for systems handling customer data and transactions
• Continuous attack surface monitoring tied to deployment cycles
• Multi-tenant and business logic testing (e.g., cross-tenant data access, privilege escalation, broken authorization)
• Replacement or augmentation of bug bounty and pentesting programs

Tenzai is a cybersecurity company that develops an agentic, AI-driven penetration testing platform designed to continuously identify, exploit, and remediate vulnerabilities in enterprise applications. The platform is built around autonomous AI "hackers" that are intended to replicate the offensive reasoning and techniques of skilled human penetration testers, operating at machine speed and scale.

• Continuous, autonomous penetration testing of enterprise applications
• AI agents that operate with adversarial reasoning
• Targets defined and authorized by the customer
• Available as SaaS or on-premises deployment
• Remediation guidance included alongside vulnerability discovery