Dionach

Dionach is a cybersecurity consultancy and assurance provider that helps organisations identify risk, strengthen resilience, and meet security and regulatory requirements. As part of the Nomios Group ecosystem, the company serves sectors including aviation, defence, education, energy, finance, government, healthcare, oil and gas, retail, and technology. Its services combine practical security testing with compliance guidance, strategic advice, and incident support.

Dionach’s assurance work includes penetration testing, threat-led testing, red and purple teaming, social engineering, cloud security assessments, and testing for industrial control systems. It also audits security controls, assesses cyber maturity, and evaluates readiness for ransomware and other threats. For compliance, the company supports standards and frameworks such as ISO 27001, ISO 22301, ISO 42001, NIST CSF, PCI DSS, DORA, NIS2, and Cyber Essentials, alongside sector-specific requirements.

Dionach also provides cybersecurity strategy and consultancy, virtual CISO leadership, AI governance and risk management, and AI application testing. Its response services include incident preparation, immediate or ongoing support, and forensic investigations to help clients contain incidents, understand their impact, and recover.