Top 250 MSSPs: Managed Security Services Company List and Research for 2021


A few reminders for you:


140. Steel Root
Salem, Massachusetts, USA
Steel Root helps companies in the U.S. Defense Industrial Base meet cybersecurity and compliance requirements under CMMC, DFARS, and other federal standards. The company specializes in the implementation and management of cloud-native, zero trust systems purpose built for meeting DoD compliance requirements. Steel Root provides managed security and compliance services to help U.S. government and defense contractors build cybersecurity maturity.


139. Castra Managed Services
Durham, North Carolina, USA
Castra is a team of Information Security Experts. We know that the #1 problem in Information Security is resources. Our 15,000 square-foot, 24×7, SOC2-Certified Security Operation Center is second-to-none and is filled with well-trained, US-Based, diligent analysts and some of the top technology on the planet. Our service includes human experts and technology with an integrated approach. We’ve mastered several different Information security technologies, and you can choose which one is best for you and your organization.


138. Difenda
Oakville, Ontario, Canada
Difenda is a privately held SecOps-As-A-Service company founded in 2008. We deliver 24x7x365 security operations backed by our modernized PCI, SOC 2 Type 2, and ISO27001 certified Cyber Command Centers. Difenda’s MDR (IT and IoT) and AVM practice is powered solely on the Microsoft security product stack. We are a Microsoft Security Gold partner and hold the Advanced Specialization Threat Protection certification. We are an outcome-driven security services company with a fully integrated and modular platform that leverages an agile, innovative and collaborative approach with our Difenda Shield, along with advisory and offensive security services.


137. JMARK Business Solutions, Inc.
Springfield, Missouri, USA
JMARK is a managed service provider that focuses on the SMB marketplace, company sizes between 25 and 200 users. We have dedicated teams supporting industries such as banking, healthcare, hospitality, manufacturing, legal and education. Our motto is People First, Technology Second and we partner with our clients and vendors for mutual success. We will deliver consistently awesome service while being a refreshingly honest and trusted partner.


136. Kyber Security
Fairfield, Connecticut, USA
To deliver enterprise grade cyber security and secure support services to the SMB market from a hacker’s point of view.


135. Decypher Technologies
Glenwood Springs, Colorado, USA
Decypher Technologies is an award-winning IT Solutions Company, possessing over 100 years of combined IT experience and nearly two dozen certifications. Decypher specializes in Managed IT Services, Cybersecurity and Cellular DAS. We’re also very proud that we consistently earn 5-star Glassdoor ratings from our staff.


134. Datasixth Security Consulting
Victoria Island, Lagos, Nigeria
DataSixth is an MSSP service provider, that delivers Cybersecurity Intelligence. With our unique capabilities, we’re able to deliver value, deliver answers, and deliver actionable security intelligence.


133. Nclose (Pty) LTD
Cape Town, South Africa
In a world with ever-changing threat landscape, Nclose continues to evolve its services to meet the requirements of securing your business. We partner with you to deliver managed security solutions that evolve with your business and become an extension of your operational delivery teams. The Nclose approach is collaborative, we value your business and offer you best of breed solutions that are capable of handling your needs. We strive to automate, integrate and correlate your security technology. Invest into passion and in-depth industry experience. Experience next-generation security services that proactively protect your business today, and tomorrow.


132. inSOC Inc.
Los Angeles, California, USA
We offer a turnkey MSP cybersecurity solution with wraparound SOC monitoring. Our enterprise-level Open XDR platform detects security breaches 24/7 with vulnerability management built-in. We are designed for MSPs and MSSPs from the ground up. Our solution is based on the NIST Cybersecurity Framework, and supported by our 24/7/365 security operations center monitoring.


131. NRD Cyber Security
Vilnius, Vilnius, Lithuania
CyberSOC is a cyber threat monitoring service developed and maintained by NRD Cyber Security. The primary objective of CyberSOC is to assure proactive detection of emerging threats and incidents in a client’s infrastructure and information systems, empowering the client to effectively mitigate cyber incidents or attacks in the early stages and minimise or prevent damages caused by cyber-attacks. CyberSOC experts do not only register and handle cyber incidents, but also monitor the client’s IT infrastructure, identify potential vulnerabilities and suggest how they can be resolved, enhancing the organisation’s cyber resilience as a result. The processes that are monitored include, but are not limited to: User logs; data logs and leakage; actions performed by administrators; and any other parameters that may be posing threats to business.

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