Visibility beyond traditional security.
Big Four Security delivers resilience and operational visibility across industrial and critical infrastructure environments through expert services and intelligent tool integration — connecting OT systems with supply chain intelligence across substations, factories, ports, and data centers.
Security and intelligence engineered for operational reality.
A unified approach across IT, OT and the physical layer — built by operators, researchers and infrastructure engineers.
OT & ICS Security
Device Heritage
Automated Validation
Infrastructure Visibility
Technical Consulting
Cyber Financial Services
A platform built for physical and digital infrastructure.
GridHound
Automated OT/ICS penetration testing and security validation for power, manufacturing and critical infrastructure.
- Asset discovery and policy validation
- RF awareness and facility mapping
- Unknown device detection
- Continuous posture monitoring
Device Heritage
Device origin intelligence and digital heritage analysis across hardware, supply chain and provenance.
- Hardware origin and component mapping
- Supply-chain intelligence
- Compliance and risk identification
- Device genealogy reporting
Technical Consulting
Architecture, red teaming, product security and resilience strategy for industrial and high-stakes environments.
- OT security architecture
- Industrial assessments & red teaming
- AI / security integration
- Strategic technical advisory
Cyber Financial Services
Technical due diligence and cyber risk evaluation for investors, acquirers and corporate development.
- Cyber risk evaluation
- Technical due diligence
- M&A security review
- Operational cyber maturity
Built for the environments that matter.
Latest from Big Four Security.
Publications, research and field notes on OT security, device identity and non-human entities.
Robot IDs Are Coming. The Real Problem Is Bigger Than Robots.
China is moving to assign identity numbers to humanoid robots — an early signal of a much larger problem: identifying, tracing and controlling non-human entities in the physical world.
Publications and perspectives from the Big Four Security team.
Operators, not vendors.
We bring deep expertise across IT, OT and the physical layer — combined with intelligence-driven methodology and rapid deployment.
- Deep technical expertise across IT and OT
- Intelligence-driven, operationally mature
- Real-world security & infrastructure experience
- Fast deployment without disrupting operations
When you're sure you're under attack — it's too late.
If you suspect a cyber security incident or need immediate operational support, our emergency response team is available for rapid engagement.