Top Managed Security Services (MSS) Companies

The global managed security services (MSS) market is poised for strong growth. It is projected to increase from USD 39.47 billion in 2025 to USD 66.83 billion by 2030, at a CAGR of 11.1% over the forecast period. This growth is underpinned by the rising demand for 24/7 security monitoring and incident response. As cyberattacks escalate in frequency, sophistication, and scale, traditional 9-to-5 security postures are no longer sufficient. Modern threat actors are increasingly launching attacks during off-hours—late at night or early morning—when in-house security teams are least active. This operational vulnerability is compelling organizations to adopt MSS for uninterrupted protection and rapid threat mitigation.

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The surge in zero-day vulnerabilities further fuels the urgency, advanced persistent threats (APTs), and the growing complexity of digital environments. MSS providers bring specialized expertise, real-time threat intelligence, and scalable security operations centers (SOCs) that many enterprises cannot build or maintain internally. As a result, sectors with high stakes in data protection—including healthcare, financial services, government, manufacturing, and critical infrastructure—are accelerating their investments in MSS to ensure business continuity, regulatory compliance, and customer trust.

Top Managed Security Services Companies include:

• IBM (US)
• NTT (Japan)
• LevelBlue (US)
• Accenture (Ireland)
• DXC Technologies (US)

The MSS market is led by some of the globally established players, such as IBM (US), NTT (Japan), LevelBlue (US), Accenture (Ireland), DXC Technologies (US), Secnap (US), Deloitte (UK), Secureworks (US), and Trustwave (US). These market players have adopted various strategies, such as partnerships, contracts, expansions, and acquisitions, to strengthen their position in the MSS market. The organic and inorganic strategies have helped the market players expand globally by providing advanced MSS.

In April 2025, IBM unveiled its Autonomous Threat Operations Machine (ATOM) and X-Force PTI agent, powered by agentic AI, to enhance its managed detection and response services. TOM automates threat triage, investigation, and remediation with minimal human input, while PTI delivers vertical-specific predictive threat insights for proactive security operations.

In March 2025, NTT partnered with Rubrik to launch Ransomware Protection Services, integrating Rubrik’s zero-trust data security with NTT’s managed resilience and rapid recovery capabilities.

IBM (US) is a global technology and consulting leader delivering advanced computing, cloud, and cybersecurity solutions. Headquartered in the US, IBM operates in over 175 countries and serves the BFSI, healthcare, government, telecommunications, energy, and manufacturing industries. The company’s extensive portfolio includes infrastructure services, cloud platforms, AI-powered analytics, and enterprise software. In cybersecurity, IBM delivers end-to-end MSS encompassing identity and access management (IAM), cloud security, data protection, application security, endpoint protection, and threat intelligence.

Its security division enables organizations to strengthen resilience through advanced threat detection, security strategy consulting, and compliance-driven risk management. IBM’s solutions are tailored to address vertical-specific use cases in supply chain, financial services, automotive, and real estate. Leveraging global delivery capabilities and continuous innovation, IBM supports clients with scalable, intelligent, and proactive cybersecurity strategies to navigate an evolving threat landscape.

NTT (Japan) is a global technology and system integration company with decades of experience delivering advanced IT and managed services. Headquartered in Japan, NTT operates in over 50 countries, serving key industries including government, finance, healthcare, manufacturing, and telecommunications. With its origins dating back to 1967 and later privatized in 1985, NTT became a trusted provider of digital transformation and infrastructure solutions. Its core offerings include consulting, digital operations, data intelligence, system development, and IT outsourcing.

In the managed security space, NTT delivers comprehensive services, including threat detection, enterprise security monitoring, vulnerability management, and security device management. Its cybersecurity portfolio covers cloud security, application security, data protection, governance, identity and access management, and managed detection and response.

With over 7,500 cybersecurity professionals and over 80 global delivery centers, NTT enables organizations to safeguard digital assets and maintain compliance. The company continues to drive innovation and secure enterprise operations across diverse sectors through a scalable and intelligent cybersecurity framework.

LevelBlue Formerly known as AT&T Cybersecurity, LevelBlue is a U.S.-based leader in managed security services, offering advanced threat detection, incident response, and compliance management. Leveraging its Open Threat Exchange (OTX) and Unified Security Management (USM) platform, LevelBlue integrates AI and machine learning to provide real-time threat intelligence and proactive defense. It serves enterprises with scalable, cloud-based MSS solutions that align with complex regulatory and cybersecurity requirements.

Accenture is a global powerhouse in professional services and cybersecurity, offering end-to-end Managed Security Services through its Cyber Defense services portfolio. With global security operations centers (SOCs), Accenture provides 24/7 threat monitoring, risk management, and incident response capabilities. The company combines automation, threat intelligence, and AI to deliver proactive protection, especially for large enterprises undergoing digital transformation across industries such as finance, healthcare, and government.

DXC Technology delivers comprehensive Managed Security Services that support enterprises in securing hybrid IT environments, from on-premises infrastructure to cloud ecosystems. Its MSS offerings include threat detection and response, vulnerability management, identity and access management (IAM), and regulatory compliance support. By integrating AI, automation, and deep industry expertise, DXC helps organizations mitigate risks and maintain resilience against evolving cyber threats while ensuring business continuity.

Market Ranking

The MSS market is highly competitive, with leading players such as IBM, NTT, LevelBlue, Accenture, and Fujitsu collectively accounting for approximately 18–22% of the global market share. IBM is a leading global provider offering a broad MSS portfolio with strengths in threat intelligence, security operations, cloud security, and AI-driven automation. NTT provides end-to-end managed security through its global SOC network, serving critical industries with sector-specific threat detection, risk mitigation, and compliance support. LevelBlue (formerly AT&T Cybersecurity) delivers scalable MSS solutions through its Open Threat Exchange platform, specializing in threat detection and response.

Accenture offers deep cybersecurity consulting integrated with MSS delivery, helping global enterprises align security with digital transformation. Fujitsu focuses on managed detection and response (MDR), incident management, regulatory compliance, and supporting clients with localized services and global expertise. The remaining market consists of regional and niche MSSPs gaining momentum through innovation, regulatory shifts, and rising enterprise security demand across sectors.

Related Reports:

Managed Security Services (MSS) Market by Service Type (Security Operations & Monitoring (SOCaaS, SIEM-as-a-Service), Advanced Threat Detection (MDR, MXDR), Identity & Data Protection), Type (Fully Managed, Co-Managed) - Global Forecast to 2030

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