Incident Response Firms Directory

Alexandria, Virginia

Industry pioneer in incident response with expertise dating back to 2004. Known for investigating high-profile nation-state attacks and advanced persistent threats. Part of Google Cloud since 2022, operating in over 30 countries with frontline threat intelligence.

Austin, Texas

Global cybersecurity leader providing cloud-native endpoint protection and incident response services. Investigated major breaches including Sony Pictures and DNC incidents. Combines threat intelligence with rapid response capabilities.

Armonk, New York

Enterprise-grade incident response backed by IBM's global infrastructure and threat intelligence network. CREST-accredited with specialized expertise in hybrid cloud environments and AWS security. Provides integrated threat management aligned with NIST CSF.

New York, New York

World leader in incident response handling over 3,000 security events annually. Combines digital forensics expertise with risk advisory services across 35+ offices in 20 countries. Known for complex, high-profile breach investigations.

Atlanta, Georgia

Cybersecurity company with over 15 years of incident response experience, supporting thousands of global engagements since 2007. Performs 3,000+ incident response and adversarial tests annually. Recently acquired by Sophos in 2025.

Santa Clara, California

Elite threat intelligence and incident response team combining world-renowned researchers with seasoned IR consultants. Named a Leader in Forrester Wave for Cybersecurity Incident Response Services. Available 24/7 globally with deep expertise in complex ransomware and insider threats.

Manchester, United Kingdom

Global information assurance firm with over 2,000 employees across 35+ offices worldwide. Listed on London Stock Exchange as FTSE 250 constituent. Trusted advisor to 15,000 clients providing end-to-end incident response and recovery guidance.

Boston, Massachusetts

Cybersecurity company serving over 9,000 customers across 120+ countries. Founded by computer scientists with mission to revolutionize cyber security management and threat detection. Provides comprehensive attack surface management and incident detection services.

San Jose, California

One of the largest commercial threat intelligence teams in the world, backed by Cisco's global infrastructure. Provides emergency incident response services available 24/7/365 globally. Combines deep threat research with hands-on incident response capabilities.

Dublin, Ireland

Global professional services company serving clients in 120+ countries with around-the-clock IT, OT, and cloud incident response. Completed 20+ security acquisitions since 2015. Operates global 24/7 operations center for continuous incident response through FusionX division.

Hanover, Maryland

Leader in industrial cybersecurity founded by former ICS/OT practitioners from U.S. government and ally nations. Specializes in operational technology environments with hands-on training facilities and multiple ICS cyber ranges. Valued at $1.7B with global presence across Washington DC area.

Eden Prairie, Minnesota

Global security operations leader completing over 1,000 incident response engagements annually. Preferred partner with 30+ major cyber insurance carriers globally. Acquired Tetra Defense in 2022 to enhance incident response capabilities with 3,200+ employees.

New York, New York

Specialized risk management firm with leading experts in digital forensics, incident response, and investigations. Named a Leader in Forrester Wave for Cybersecurity Incident Response Services 2024. Acquired by Aon in 2016 with offices in US, London, Zurich, Dubai and Hong Kong.

Stow, Ohio

Founded by renowned security expert David Kennedy with mission to change the security industry. Provides advanced managed detection and response trusted by hundreds of enterprise customers. Combines threat hunting with comprehensive incident response services.

Tel Aviv, Israel

Elite cyber consulting firm founded by veterans of Israel's Unit 8200. Acquired by Temasek for $250M in 2018. Draws top talent from elite military technology units with expertise spanning APAC, Europe, and Americas. Part of Team8 cybersecurity foundry.

McLean, Virginia

Only company holding all three elite Federal Government cybersecurity accreditations: NSA CIRA, NSA VAS, and GSA HACS. Supports approximately 1,000 independent incident response engagements annually. Handles complex breaches for Fortune 500 and Global 2,000 companies with 80+ global offices.

New York, New York

Ranked #1 for security consulting by Gartner for 12 of last 13 years. Provides Cyber Incident Readiness, Response, and Recovery services through 24/7 Cyber Intelligence Centres worldwide. UK team is NCSC-accredited with scalable global forensic lab capabilities.

London, United Kingdom

NCSC-accredited Cyber Incident Response Level 1 provider supporting organizations since 1998. Named Leader in Forrester Wave for Digital Forensics and Incident Response. Provides global 24/7/365 incident response retainers across 13+ countries with specialized teams.

New York, New York

Named global leader in IDC MarketScape for Worldwide Incident Readiness Services 2021. Ranked #1 by clients for quality of security services in Source Global Research. Provides 24/7 Cyber Hotline with experienced investigators specializing in digital forensics and recovery.

Guildford, United Kingdom

Part of BAE Systems with 4,700+ digital, cyber and intelligence experts across 16 countries. Founding and certified member of NCSC Certified Incident Response Scheme and CREST certified. Provides remote support within hours from centres of excellence in UK, US and Australia.