Provides services for security, investigation, web security and ICT awareness. Specializes in penetration testing.

Provides product independent digital security services, specialising in penetration testing, technical training and core security consulting. Located in London, England.

Provides ethical hacking, assessments and security services.

Providers of penetration testing, vulnerability assessment, consulting, and educational services.

Provides penetration and wireless security testing, vulnerability assessments, social engineering and full security audits. Based in South England.

Specializes in penetration testing, vulnerability assessments, network, commerce and business security, intrusion detection and response, risk mitigation, and consulting services.

RVASI provides services and solutions globally. Specializes in web application vulnerability assessments.

Offers several security auditing packages include risk assessment and penetration testing. Based in Washington, DC, USA