Browse MSSP Providers
Compare managed security service providers. Use filters to narrow your search. The directory covers providers across all major service categories (MDR, SIEM management, vulnerability scanning, incident response, and more) as well as a wide range of industries and security platforms. Use the filter sidebar to narrow results by the criteria that matter most to your organization, and combine multiple filters to zero in on the right shortlist. Each provider profile includes service details, certifications, platform expertise, and key operational facts so you can compare options without leaving the page. New to MSSPs? Read our guide on what managed security service providers do or see the top MSSPs in 2026.
Ingalls Information Security
Best for: SMB to Enterprise orgs, Government & Public Sector, Defense & Aerospace
Ingalls Information Security provides managed detection and response and incident response services, with deep roots in military and government cybersecurity ex...
Kyndryl
Best for: Enterprise orgs, Government & Public Sector, Manufacturing
Kyndryl is the world's largest IT infrastructure services company, spun off from IBM in 2021, operating a global cybersecurity practice with 4,000+ security pra...
Leidos Cybersecurity
Best for: Enterprise orgs, Government & Public Sector, Defense & Aerospace
Leidos is a Reston, VA-based defense and technology company with a major cybersecurity practice, delivering managed security and continuous monitoring for US fe...
MAD Security
Best for: SMB to Mid-Market orgs, Defense & Aerospace, Government & Public Sector
MAD Security provides managed cybersecurity services to defense contractors and government organizations, specializing in CMMC compliance and threat monitoring.
Mandiant (Google Cloud)
Best for: Enterprise orgs, Government & Public Sector, Technology
Mandiant, now part of Google Cloud, delivers elite MDR and incident response services backed by 500+ threat intelligence analysts from 30+ countries with decade...
ManTech
Best for: Enterprise orgs, Government & Public Sector, Defense & Aerospace
ManTech International is a Herndon, VA-based technology and cybersecurity services company founded in 1968, delivering managed cyber defense, threat intelligenc...
Marlink Cyber
Best for: Mid-Market to Enterprise orgs, Transportation & Shipping, Energy & Utilities
Marlink provides managed cybersecurity services for the maritime and offshore energy industries, combining satellite connectivity expertise with specialized mar...
Mnemonic
Best for: Mid-Market to Enterprise orgs, Government & Public Sector, Energy & Utilities
Mnemonic is a Norwegian cybersecurity services company providing managed detection and response, threat intelligence, and security consulting, with strong posit...
Nightwing
Best for: Enterprise orgs, Defense & Aerospace, Government & Public Sector
Nightwing provides advanced cybersecurity and intelligence solutions to the U.S. government, offering managed cyber defense, threat intelligence, and digital mo...
OpenText
Best for: Mid-Market to Enterprise orgs, Government & Public Sector, Defense & Aerospace
OpenText provides managed security services built on its ArcSight and EnCase platforms, serving large enterprises with mature security programs that need operat...
Optiv Security
Best for: Mid-Market to Enterprise orgs, Government & Public Sector, Manufacturing
Optiv is one of the largest pure-play cybersecurity companies in North America, founded in 2015 in Denver with 2,000+ employees and offering managed security, c...
Orange Cyberdefense
Best for: Mid-Market to Enterprise orgs, Government & Public Sector, Telecommunications
Orange Cyberdefense is the cybersecurity arm of Orange Group, employing 3,000+ security experts across Europe and Asia and operating 18 SOCs to defend organizat...