Managed security service providers in the United States

NETSCOUT provides real-time network visibility, observability, cybersecurity, and DDoS protection solutions.

Fastly provides an edge cloud platform that helps businesses deliver, secure, and deploy applications and AI workloads.

IBM is a technology company that sells software, infrastructure, and consulting services.

Managed security provider that now runs Trustwave's SpiderLabs penetration testing team, with CREST-accredited testing, red and purple teaming, and deep PCI DSS expertise.

Miami-based cybersecurity firm with 300+ employees and deep healthcare/HIPAA expertise. Delivering pen testing since 2000.

Community-driven penetration testing firm known for free security education, open-source tools, Wild West Hackin' Fest, and practical offensive security services.

Potenza Services is a veteran-owned firm based in Tampa, Florida, founded in 2012.

7AI provides AI agents that automate security operations centre tasks for enterprises.

Provides cloud security, compliance and managed detection and response services to regulated industries.

AT&T Cybersecurity provides network security services to businesses of all sizes.

BARR Advisory helps organisations establish, manage, and audit cybersecurity and compliance programmes.

Critical Start provides managed detection and response services to monitor, investigate, and resolve security threats for organisations.

CyberSheath provides cybersecurity compliance services for DOD contractors, focusing on CMMC, DFARS, and NIST standards.

Cyderes provides managed cybersecurity services including identity, threat detection, and exposure management.

Computer and IT infrastructure maker whose PowerProtect Data Manager software and Data Domain appliances back up data, detect ransomware and speed recovery.

Druva provides a fully managed SaaS platform for data backup, recovery, and cyber resilience.

EC-Council is a cybersecurity certification and training body.

Expel provides managed detection and response security services using AI and human analysts.

Foresite provides managed detection and response services using agentic AI for security operations.

Ontinue provides managed detection and response services for Microsoft security customers.

PowerDMARC provides a cloud-based platform for email authentication and domain security.

Quzara provides FedRAMP compliance advisory and managed detection and response services.

Swimlane provides agentic AI automation for security operations, vulnerability management, and compliance.

Team Cymru provides global threat intelligence from internet traffic for proactive defence.

UnderDefense provides managed detection and response, incident response, and compliance automation services.

Cybersecurity consulting and engineering for US government and industry, including threat hunting, zero trust, incident response and defence of critical infrastructure and weapon systems.

Provides penetration testing, PCI ASV scanning, and managed security services for compliance and threat detection.

IntelliGRC provides software that helps managed service providers automate cybersecurity compliance and audit readiness.