Top Managed Security Service Providers (MSSP) In 2026
Daria Pohrebniak
Marketing Director - Reverb
07.23.2026
This list compares ten managed security service providers (MSSPs) in 2026, from global consultancies to specialist detection and response firms, for organizations that want to outsource security monitoring, threat detection and incident response.
IBM’s 2026 X-Force Threat Intelligence Index revealed a 49% year-over-year increase in ransomware groups and a 44% increase in the exploitation of public-facing software and system applications.
The growing integration of AI in social engineering scams is bolstering their effectiveness, and generative AI helps scammers scale their attacks like never before.
Organizations are lucky to have MSSPs in their corner. They can monitor an enterprise’s entire digital ecosystem for cyber threats 24/7, quickly detect and respond to incidents, provide cyber threat intelligence and consulting, implement security technology, and more.
While the vendor handles your security needs in the cloud or on-site, through staff augmentation or consulting, you can focus on your core business while saving time and money. If you are looking for one, here’s ReVerb’s short list of the top managed security service providers in 2026.
Managed Security Service Providers At A Glance
Provider
Focus
Services
1. Accenture
End-to-end and industry-specific cyber services
Managed detection and response, analytics, automation, consulting
2. Deloitte
Managed security through its Cyber Operate practice
MXDR, cloud and application security, threat intelligence, compliance
3. Eviden
European sovereignty and compliance needs
Identity and access management, data protection, HSMs, digital identity
4. EY
Resilience aligned with business goals
Supply chain cyber risk, threat detection and response, identity services
5. Fortra
Offensive and defensive security technologies
Managed DLP, digital risk protection, integrity monitoring, awareness training
6. IBM
Modernizing security operations
Full-lifecycle security services, threat prevention, OT security, penetration testing
Accenture, which helps corporations, governments, and organizations in 120+ countries build their digital core, also provides end-to-end and industry-specific cyber services. With 30,000+ cybersecurity professionals and 38 cybersecurity centers worldwide, and positioned by Gartner as one of the largest security services providers for several consecutive years, Accenture is sure to remain among the top managed security service providers in 2026.
It focuses on cybersecurity as a service, implying flexible delivery, elastic pricing, automation, and modernization. Its cybersecurity delivery centers enable collaboration with an extensive ecosystem to provide managed security services (MSS), advanced analytics, and intelligent automation technologies.
Accenture consolidates managed detection and response services, delivery, and centers of excellence to monitor, detect, and investigate issues and manage risks 24/7. The protection is improved by mySecurity, a suite of strategic assets and accelerators enhanced by AI.
Services & expertise: cybersecurity managed services, cybersecurity consulting, business process & other managed services, AI & data services, cloud consulting & solutions, customer service solutions, digital engineering & manufacturing services, emerging technology consulting, finance consulting & risk management, infrastructure & capital projects, marketing, metaverse consulting & solutions, strategy consulting, supply chain consulting & solutions, sustainability consulting & solutions, technology transformation services
Team size: 30,000+ experts
Locations: San Antonio, Houston, Cincinnati & Herndon, USA; Toronto, Canada; Mexico City, Mexico; São Paulo & Fortaleza, Brazil; Buenos Aires, Argentina; Milan & Naples, Italy; Tel Aviv, Israel; Riyadh, Saudi Arabia; New Delhi, Kolkata, Hyderabad, Mumbai, Chennai & Bangalore, India; Tokyo, Japan
Portfolio: National Cyber Security Centre, Mitsubishi Motors, Vodafone
Deloitte serves nearly 90% of the Fortune Global 500 and thousands of companies in 150+ countries. With 35,000+ cybersecurity practitioners supporting more than 2,700 clients, it is the largest firm on our list of the best managed security service providers in 2026. Gartner’s Market Share: Security Services, Worldwide report has ranked it No. 1 by revenue for 3 consecutive years across security consulting, security professional services, and MSS.
Deloitte delivers comprehensive MSS through the Cyber Operate practice. It combines deep industry expertise, proprietary technologies, and a global delivery model built around 5 regional delivery centers and 30+ local cyber centers, enabling 24/7 monitoring and incident response and a local approach to each client’s needs.
The core services include managed extended detection and response (MXDR), digital identity, cloud, and application security, cyber threat intelligence, continuous compliance, attack surface management, operational technology security, and cyber-as-a-service (CaaS).
Deloitte’s MXDR platform enables Microsoft Defender and Sentinel users to protect their extended enterprises through AI-driven 24/7 threat hunting, endpoint, identity, cloud, and OT protection, and incident response.
Services & expertise: managed cybersecurity services, cyber defense & resilience, cyber strategy & transformation, enterprise security services, digital trust & privacy services, assurance & advisory services, audits, customer-related services, business process solutions, engineering, AI & data services, enterprise technology & performance services, global employer services, human capital services, legal services, risk, regulatory & forensic services, strategy & transactions services, tax services
Since 2023, Eviden has been committed to providing top-notch managed security services and solutions that meet European sovereignty and compliance requirements. For example, it is a launch partner for the AWS European Sovereign Cloud and is encrypting 95% of national banking transactions in France. Gartner lists it among the best MSSP providers in 2026.
Eviden helps protect data, identities, and critical infrastructure across cloud, on-premises, OT/IoT, and industrial environments. Its services span identity and access management (IAM), digital identity, data protection, hardware security modules (HSM), key management systems, data and network encryption, post-quantum cryptography, and digital sovereignty.
Eviden’s modular, interoperable solutions integrate AI, post-quantum cryptography, and mission-critical security capabilities to support government agencies, enterprises, healthcare and financial institutions, telecommunications, energy companies, and operators of essential services in compliance with the highest European security standards. Its products include the ANSSI-certified Proteccio HSM and Crypt2Pay HSM, certified to FIPS 140-2 Level 3+.
Services & expertise: software & hardware cybersecurity products, mission-critical systems, AI video analytics, defence & homeland security solutions
Team size: 6,500+ experts
Locations: Paris, France; London, UK; Chicago & Plano, USA; Toronto, Laval & Montréal, Canada; Sydney, Australia; Beijing & Hangzhou, China; 59 more worldwide
Portfolio: Paris 2024 Olympic and Paralympic Games, DO & CO Aktiengesellschaft, Ørsted, Accor, Hôpital Privé de l’Est Lyonnais
Like Deloitte, EY draws on extensive experience supporting Fortune 500 companies, federal agencies, government organizations, and non-profits across 150+ countries. As a managed security service provider, it combines deep industry expertise with AI and alliances with Microsoft, CrowdStrike, and other tech leaders.
EY facilitates future-ready resilience aligned with clients’ business goals through technology, innovation, and regulatory expertise, streamlined operations using agentic AI, modular solutions forming a “multi-tower” cybersecurity framework, enterprise-wide visibility, and innovation supported by proprietary cyber accelerators.
For example, EY’s supply chain cyber risk managed services help mitigate data breaches and improve overall security across the supplier and third-party lifecycle. Continuous monitoring, automated threat hunting, advanced analytics, and intelligence-based guidance prevent and remediate attacks promptly. Executive reporting and custom integration and automation capabilities support ongoing discovery of vulnerabilities and internet-facing risks. Digital identity technologies and processes streamline access management and governance.
EY’s delivery model is supported by 60 cybersecurity operations centers providing 24/7 monitoring and response according to local regulatory and business requirements and a global team of 11,000 cyber and risk experts, including 1,600+ with U.S. security clearances.
Fortra rebranded from HelpSystems in 2022 to reflect its focus on cybersecurity. Now, the company employs more than 2,000 security professionals, including 400+ threat researchers and data scientists, across 15 countries and serves more than 7,200 organizations.
The MSSP combines offensive and defensive security technologies with proprietary machine learning and large language model capabilities to help organizations securely adopt AI while improving cyber resilience, including protection against AI-driven threats.
Fortra’s digital risk protection solution delivers data collection across the surface, deep, and dark web, expertly curated intelligence, and complete mitigation of digital risks. Data loss prevention capabilities include granular control of all data movement, network traffic monitoring, support for Windows, macOS, and Linux, and accelerated compliance efforts. File integrity monitoring and security configuration and vulnerability management protect data from cyberattacks while maintaining regulatory compliance.
Fortra’s IBM i security services include annual risk analyses for each licensed partition and monitoring of the key security indicators.
Services & expertise: managed data loss prevention, managed digital risk protection, managed integrity monitoring, managed security awareness training, IBM i security services, IT infrastructure protection, email security & anti-phishing solutions, data protection solutions, compliance solutions, managed file transfer solutions, IBM Power solutions
Team size: 2,000+ experts
Locations: Eden Prairie, USA; Altrincham, UK; Barcelona, Spain; Buenos Aires, Argentina; Melbourne, Australia
Portfolio: Jabil, Broadway Bank, Investors Bank, Tulane University, Austin Travis County Integral Care, Michigan Catholic Conference
Backed by global expertise, IBM helps organizations modernize and streamline cybersecurity operations through continuous monitoring, management, and threat intelligence. IBM Security specialists, technology, facilities, and processes are in place to provide some of the best managed security service edge (SSE) and fully managed security services.
IBM’s MSSP portfolio covers full-lifecycle security services, from threat prevention to technology management. For example, its global security intelligence experts, AI-powered threat detection, fast response, incident response, exposure management, and OT services and penetration testing for apps, networks, hardware, and staff allow clients to anticipate and prevent modern threats, respond to attacks effectively, and minimize their impact.
X-Force is IBM’s elite team of hackers, responders, and researchers. The X-Force Protection Platform, using AI to handle up to 85% of alerts, can support existing tools and services to create a managed 24/7 solution for the hybrid cloud environment. IBM protects hybrid cloud and multicloud environments through continuous visibility, management, and remediation.
IBM also provides ongoing behavior-aware monitoring, expert-led threat hunting, identity threat operations, and workforce, consumer, and non-human identity and access management, backed by unified visibility across all providers and endpoints.
Services & expertise:cyberthreat management services, TDR managed services, IAM services, cloud security services, IBM X-Force Cyber Range training, endpoint security services, IBM Autonomous Security, IBM CyberDefend services, governance, risk & compliance services
Team size: 8,000+ experts
Locations: Bangalore, India; Costa Rica; Hortolandia, Brazil; Wroclaw, Poland; Budapest, Hungary; Madrid, Spain; Hursley, UK; Riyadh, Saudi Arabia; Sydney, Australia; Tokyo, Japan; Markham, Canada; Bogota, Colombia
Portfolio: Doosan Corporation Digital Innovation BU, Unisys, Belfius, Finastra
The largest provider of IT infrastructure services is also a top MSSP with more than 30 years of experience in transformative IT security and infrastructure solutions, specialized programs, and platform integrations. Kyndryl specializes in MSS on AWS.
For example, this includes a centralized vulnerability-scanning system with remediation guidance covering EC2 Compute and Containers. It provides real-time notifications about security vulnerabilities and a comprehensive view of a client’s security posture across the AWS environment. Utilizing AWS’ native and third-party capabilities, Kyndryl MSS also provides a consolidated view into security events and incidents.
Its IAM services provide risk-adjusted controls, IAM maturity consulting, and managed services for secure IT access. Kyndryl also offers services to secure end-user devices, on-premises, cloud, and hybrid networks, and mainframe environments.
Its 24/7 security incident management includes end-to-end incident detection, alerting, management processes, and automated remediation. TDR services facilitate incident management through incident triage, threat intelligence, and compliance monitoring. The solution includes managed detection and response, SIEM, offensive testing, and AI.
Services & expertise: governance, risk & compliance services, zero trust services, security operations & response services, application services, network & edge solutions, cloud services, AI & data services, digital workplace services, mainframe modernization, technology consulting
Team size:7,500+ experts
Locations: New York, USA; Toronto, Canada; London, UK; Dubai, UAE; Riyadh, Saudi Arabia; Sydney, Australia; Tokyo, Japan; Hong Kong; Bangalore, Mumbai, Hyderabad, Chennai, and 5 more in India; 60+ more worldwide
Portfolio: Krungsri, Compass Group Spain, DPD, Aptiv, Broadridge
Frost & Sullivan’s 2026 Frost Radar report on the best managed security services in the Americas named LevelBlue the Growth and Innovation leader, highlighting its extensive MSS portfolio, unified platform approach, and proficiency.
With SpiderLabs’ intelligence and a global team of 1,000+ security consultants, threat hunters, incident responders, forensic investigators, and researchers, the MSSP alleviates clients’ teams and proactively protects them against advanced threats 24/7.
For example, LevelBlue provides AI-driven threat detection, investigation, and response and helps thwart complex attacks with 24/7 co-managed detection and response across endpoints, identities, and apps. It also protects web apps and APIs from zero-day threats, bots, API abuse, and DDoS attacks with expert-led, always-on security.
Its managed cloud security helps safeguard cloud assets, enforce policies, and optimize operations across hybrid environments, and SSE enables secure cloud access and remote work with advanced controls enforcing policies, reducing risks, and ensuring compliance. Managed secure access service edge (SASE) helps enforce zero trust everywhere and optimize performance.
LevelBlue’s managed DDoS defense and Next-Gen Firewall include 24/7 monitoring, rapid response, and expert mitigation, and the content delivery network (CDN) services protect organizations from bots, phishing, malware, and ransomware while ensuring a seamless content experience for their customers.
Gartner also lists Proficio among the best MSSP providers in 2026. The smallest company on our list, it still helps other organizations “overcome the cybersecurity talent shortage through Managed Detection and Response and Agentic AI SOC capabilities.”
Agentic AI SOC bridges security and resource gaps with autonomous threat detection, AI-driven SOC automation, and hosted SIEM/XDR solutions. This ensures proactive defense, monitoring, and intelligent response 24/7. Proficio’s managed detection and response (MDR) services are tailored to unique business needs and available as a fully hosted cloud-based platform or as a co-managed platform leveraging existing infrastructure.
Integrating with client-owned Microsoft Sentinel SIEM, ProSOC MDR for Microsoft delivers 24/7 security monitoring, advanced threat detection, automated response, and expertly managed SIEM services. ProSOC MDR for Splunk works in a similar way with Splunk Cloud and Splunk Enterprise SIEM. Managed SIEM for both tools helps ensure seamless platform management and maintenance and optimizes ROI.
Managed endpoint detection and response helps prevent unauthorized access to corporate devices. Proficio’s value-added services, ranging from enhanced visibility to proactive defense measures, are designed to bolster an enterprise’s cybersecurity posture.
It’s no surprise that the second-largest telecommunications company has a top MSSP offering under the Verizon Business umbrella. One of the largest global IP networks enables unprecedented insight into security threats. Now, Verizon counts 16 years of market-leading analysis of cyber threats and trends and 12 years of forensic investigations, with nearly 1 million incidents analyzed in its annual Data Breach Investigations Reports.
The company runs 9 SOCs and 6 digital forensics labs around the world and has a 500,000-strong security portfolio of security, network, and hosting devices under management. A global team of 200+ investigators, forensics lab technicians, intelligence analysts, and support personnel conducts around 700 engagements annually.
Verizon’s security and protection services portfolio includes DDoS protection and mitigation, SASE solutions, Internet security tools for small businesses using Verizon Fios, advanced SOC services, and services for mobile security. Cyber risk management products and services range from assessment to threat intelligence.
The fully managed Secure Gateway services enable enterprises’ remote locations and mobile users to securely access their private IP networks and the Internet, the connectors to which are also configured, hosted, and managed by Verizon.
Locations: New York, Basking Ridge, Irving, Boston, and 13 more in the USA; Chennai, Hyderabad & Bangalore, India; Singapore; Canberra, Australia; Manila, Philippines; Tokyo, Japan; London, UK; Dublin, Ireland; Prague, Czech Republic; 10+ more
Portfolio: ICASA, Fujifilm, Atos, Nucor, Cintas, the Commonwealth of Virginia
Managed Security Service Providers By Region
Most MSSPs on this list operate across several continents, so the grouping below is based on the office and delivery locations each entry lists, not on headquarters. Use it to shortlist providers with a stated presence where your teams, data and regulators sit, then confirm local coverage with each provider.
United States And The Americas
Accenture (San Antonio, Houston, Cincinnati, Herndon, plus Toronto, Mexico City, Sao Paulo and Buenos Aires), Eviden (Chicago, Plano, Toronto, Montreal), Fortra (Eden Prairie, Buenos Aires), IBM (Costa Rica, Brazil, Canada, Colombia), Kyndryl (New York, Toronto), LevelBlue (Plano, Chicago, Denver, Reston), Proficio (Irvine) and Verizon (New York, Basking Ridge, Irving, Boston and more in the USA).
Europe And The UK
Eviden (Paris, London), EY (Malaga, Stockholm, Goteborg), Fortra (Altrincham, Barcelona), IBM (Wroclaw, Budapest, Madrid, Hursley), Kyndryl (London), LevelBlue (London, Dublin, Madrid, Frankfurt, Warsaw), Proficio (Barcelona), Verizon (London, Dublin, Prague) and Accenture (Milan, Naples).
India And Asia Pacific
Accenture, Deloitte, EY, IBM, Kyndryl and Verizon all list Indian locations. For wider APAC coverage, Eviden lists Sydney, Beijing and Hangzhou, Kyndryl lists Sydney, Tokyo and Hong Kong, LevelBlue lists four Australian cities and Auckland, Proficio and Verizon list Singapore, and Fortra lists Melbourne.
What An MSSP Includes
A managed security service provider runs some or all of your security operations under contract. Services vary, but most MSSP agreements cover a core set:
24/7 monitoring: a security operations center (SOC) watches logs and alerts from your network, endpoints and cloud.
Threat detection and response: investigating alerts, containing threats and guiding remediation, often through MDR or XDR services.
Managed security tools: operating firewalls, SIEM, endpoint protection, data loss prevention and identity tools.
Vulnerability management: scanning, prioritizing and tracking fixes, sometimes with penetration testing.
Compliance support: reporting and controls that help meet frameworks and regulations.
Incident response: expert help during a breach, plus post-incident reviews.
How To Choose An MSSP
Define what you want to outsource. Decide whether you need full management, co-managed support for an internal team, or a specific service such as MDR.
Check coverage of your environment. Confirm the provider supports your cloud platforms, OT systems and existing security tools.
Ask about response, not just alerts. Find out whether the MSSP will contain threats directly or only notify you.
Review SLAs and reporting. Look for clear detection and response times and readable reports for leadership.
Consider regulation and data location. Regulated or European organizations may need providers with specific compliance or sovereignty capabilities.
Match scale. Global firms suit complex enterprises, while specialists can be more responsive for mid-sized organizations.
An MSSP, or managed security service provider, is a company that monitors and manages an organization’s cybersecurity on its behalf. Typical services include round-the-clock monitoring, threat detection and response, managed firewalls and security tools, vulnerability management and compliance reporting. It lets organizations get expert security coverage without building a full in-house security operations center.
What is the difference between an MSSP and an MDR provider?
An MSSP usually manages a broad range of security tools and services, such as firewalls, SIEM and compliance reporting, and focuses on monitoring and alerting. An MDR (managed detection and response) provider focuses specifically on finding and actively responding to threats, often with its own endpoint tools and threat hunting. Many MSSPs, including several on this list, now offer MDR as part of their services.
Who are the largest managed security service providers?
Large global providers include IBM, Accenture, Deloitte, EY, Verizon and Kyndryl, all of which appear on this list. Their scale lets them serve multinational enterprises across many regions and industries. Specialist providers such as Proficio and LevelBlue focus more narrowly on detection and response.
Besides proactive prevention and early detection of threats, prompt and effective responses to attacks and incidents, minimized damage, faster recovery, peace of mind, and cost savings, modern AI-enabled MSS bring about improved cost certainty and flexibility, ongoing efficiency gains, higher productivity, and increased investor confidence.
We hope this article helps you find the best managed security services for your company!
If you wish to see your own MSSP on ReVerb’s list, please email us or submit a form in the Top Choices section. After a thorough assessment, we’ll decide whether it’s a valuable addition.
