Dionach
Global enterprise cybersecurity consultancy founded in 1999 in Oxford, holding rare CREST STAR-FS accreditation and delivering penetration testing, red and purple teaming, and PCI QSA services across five international offices.
Featured in: Best CREST Pen Testing Companies
About
Dionach is an enterprise-focused cybersecurity consultancy founded in 1999 and headquartered in Oxford, United Kingdom, with over 25 years of experience delivering expert security services around the world. The firm employs over 50 cybersecurity professionals across offices in Oxford, Manchester, Glasgow, New York, and Tokyo. Dionach was acquired by Nomios Group in 2024. The company holds CREST, CHECK, CREST STAR-FS, ISO 27001, ISO 9001, and PCI QSA accreditations.
Dionach's CREST STAR-FS accreditation places them among only seventeen companies in the United Kingdom to hold this distinguished status, specifically designed to meet the stringent demands of the financial services sector. Their service portfolio encompasses network and web application penetration testing, red team and purple team engagements, SCADA and OT testing, incident response, vulnerability research, and governance risk and compliance services.
Dionach's consultants hold qualifications including CREST, PCI QSA, ISO 27001 Lead Auditor, CISA, CISSP, and Certified Incident Handler certifications. The firm serves clients across finance, aviation, energy, healthcare, retail, technology, and government sectors.
Services
+ Also offers 5 more services
Accreditations
Compliance Expertise
Best For
Methodologies
No reviews yet. Share your experience →
Is this your company?
Claim Dionach to verify the listing, update your services and pricing, respond to leads, and add the Verified badge to your profile. Free for companies, we just need to confirm your business email.
Claim This ProfileRelated Providers
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
Pen Test Partners
The UK's largest independent security testing firm, renowned for IoT/OT research, CBEST red teaming, and CHECK/CREST-accredited penetration testing across all sectors.
PwC Cyber Security
Global Big Four professional services firm delivering CREST, CHECK, and CBEST-accredited penetration testing and red teaming services from London, serving the UK's largest enterprises and regulated organisations.
Aristi
CHECK and CREST-accredited Birmingham-based cyber security consultancy with over 15 years of experience delivering penetration testing, red teaming, and OT security assessments for government and private sector clients.