Top 50 Cybersecurity Services Agencies in the USA (2026)

#26Trail of Bits

New York·Boutique·14+ yrs·Score: 96

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Security research and consulting firm specializing in software assurance, cryptography, and blockchain security.

#27EY Cybersecurity

New York·Enterprise·37+ yrs·Score: 95

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Cybersecurity services and consulting from Big Four firm delivering strategic advisory and managed security.

#28GuidePoint Security

Virginia·Mid-Size·15+ yrs·Score: 93

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Cybersecurity solutions and services provider specializing in architecture, implementation, and managed security.

#29KPMG Cyber Security

New York·Enterprise·39+ yrs·Score: 93

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Cybersecurity consulting and managed services from Big Four firm focusing on risk and resilience.

#30Rapid7

Massachusetts·Large Team·26+ yrs·Score: 93

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Cloud-native cybersecurity platform providing vulnerability management, detection and response, and security analytics.

#31Secureworks

Georgia·Enterprise·27+ yrs·Score: 93

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Dell Technologies subsidiary providing managed security and threat intelligence services through Taegis XDR platform.

#32Tenable

Maryland·Large Team·24+ yrs·Score: 93

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Cyber exposure management platform provider specializing in vulnerability assessment and management.

#33Coalfire

Colorado·Mid-Size·25+ yrs·Score: 90

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Cybersecurity advisory and assessment firm specializing in compliance, risk management, and security testing.

#34Cyderes

Georgia·Large Team·4+ yrs·Score: 90

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Managed detection and response provider formed from merger of Herjavec Group and Fishtech Group.

#35Securonix

Texas·Mid-Size·17+ yrs·Score: 90

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Security analytics and operations platform provider specializing in SIEM, UEBA, and SOAR capabilities.

#36Trellix

California·Enterprise·4+ yrs·Score: 90

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Enterprise cybersecurity platform combining FireEye and McAfee Enterprise capabilities for XDR and threat intelligence.

#37Vectra AI

California·Mid-Size·15+ yrs·Score: 90

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AI-driven network detection and response platform for hybrid and multi-cloud threat detection.

#38Carbon Black (VMware)

Massachusetts·Enterprise·24+ yrs·Score: 88

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Endpoint security platform provider, now integrated into VMware's security portfolio.

#39Sophos

Massachusetts·Large Team·41+ yrs·Score: 85

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Cybersecurity solutions provider offering endpoint, network, email, and cloud security for businesses.

#40RSA Security

Massachusetts·Large Team·44+ yrs·Score: 83

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Enterprise security solutions provider focusing on identity, risk, and fraud management.

#41Lumifi Cyber

Arizona·Small Team·10+ yrs·Score: 82

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Managed detection and response provider delivering 24/7 SOC services with platform-agnostic approach.

#42Ntiva

Virginia·Mid-Size·22+ yrs·Score: 82

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Managed IT and cybersecurity services provider delivering comprehensive security solutions for businesses.

#43Barracuda Networks

California·Large Team·27+ yrs·Score: 80

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Cloud-enabled security and data protection solutions provider specializing in email, application, and network security.

#44Cipher (Prosegur)

Florida·Mid-Size·26+ yrs·Score: 80

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International cybersecurity company specializing in threat management and security consulting.

#45DXC Technology

Virginia·Enterprise·9+ yrs·Score: 80

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Fortune 500 IT services company providing enterprise-scale cloud migration and modernization services across hybrid and multi-cloud environments.

#46LevelBlue (AT&T Cybersecurity)

Texas·Enterprise·7+ yrs·Score: 80

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Managed security services provider with telecommunications heritage, recently rebranded from AT&T Cybersecurity.

#47NTT Security

Nebraska·Enterprise·10+ yrs·Score: 80

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Global managed security services provider operating as part of NTT Group.

#48Rackspace Technology

Texas·Enterprise·28+ yrs·Score: 80

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Multi-cloud managed services provider with 25+ years experience, offering migration and management across AWS, Azure, Google Cloud, and VMware.

#49Trustwave

Illinois·Mid-Size·31+ yrs·Score: 80

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Managed security services provider specializing in threat detection, incident response, and compliance-focused security.

#50WatchGuard Technologies

Washington·Mid-Size·30+ yrs·Score: 80

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Network security platform provider delivering unified threat management, secure Wi-Fi, and multi-factor authentication.