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  1. Bishop Fox250–499

    Offensive security consultancy and Cosmos continuous pentest.

    United StatesPhoenixApplication securitySecurity operationsDFIRCRESTOSCPGPEN
  2. Mandiant1,000+

    Incident response, threat intel, and Mandiant Advantage — now Google Cloud.

    United StatesRestonSecurity operationsThreat & vulnerabilityDFIRISO 27001OSCPGPEN
  3. NCC Group1,000+

    Global pentest, research, and cyber resilience consultancy.

    United KingdomManchesterApplication securitySecurity operationsISO 27001ISO 9001CREST
  4. SANS Institute500–999

    Cybersecurity training, certifications, and research.

    United StatesBethesdaHuman riskSecurity operationsGPENCISSPGCIH