Best managed security service providers: types, examples and how to choose
Group COO & CISO
Operational excellence, governance, and information security. Aligns technology, risk, and business outcomes in complex IT environments
The best managed security service provider is the one whose SOC covers your actual estate, responds within contracted times and proves it with reports. Shortlists usually mix global MDR specialists (CrowdStrike, Arctic Wolf, Sophos), large MSSPs (LevelBlue, Orange Cyberdefense, IBM), IT service firms and regional cloud-focused providers.
Key takeaways
- There is no single best MSSP. Choose by fit: your cloud and endpoint stack, regulation, language and time zone, and how much response you want the provider to take on.
- Separate three things that are often sold under one name: MSSP (broad security operations), MDR (detection and hands-on response) and SOC as a service (a monitoring team on your tools).
- Ask for contracted response times, a sample monthly report and the RACI for containment actions before you compare prices.
- Your MSSP is part of your supply chain. Under NIS2 Article 21(2)(d), in-scope EU companies must manage security in relationships with direct suppliers and service providers.
- Check independent evidence: SOC 2 Type II or ISO/IEC 27001 certification for the SOC itself, customer references in your sector, and how they performed in your own proof of concept.
What is a managed security service provider?
A managed security service provider (MSSP) runs part or all of your security operations under contract. The core is a security operations centre (SOC) that monitors logs and alerts around the clock, investigates them and responds or escalates.
Around that core, MSSPs offer some mix of the following: firewall and network security management, endpoint detection and response (EDR), SIEM operation, vulnerability management, cloud security posture management, identity protection, incident response retainers and compliance reporting.
MSSP, MDR and SOC as a service: what's the difference?
| Model | What you get | Who acts on a threat | Good fit when |
|---|---|---|---|
| MSSP | Broad managed security: devices, SIEM, monitoring, reporting, often compliance | Varies; often alert and escalate, with response as an add-on | You want one partner for many security functions |
| MDR | 24/7 detection, threat hunting and hands-on response, usually on the provider's EDR/XDR platform | The provider contains threats (isolates hosts, disables accounts) within agreed rules | You need response at night and weekends, not just alerts |
| SOC as a service / managed SIEM | A SOC team working on your SIEM and tools | Shared; the provider investigates, your team or MSP often acts | You have invested in tools (for example Microsoft Sentinel) and want people to run them |
| Co-managed | Provider and in-house team share the SOC work | Split by a written RACI | You have a small security team that needs 24/7 cover |
Well-known managed security providers, by type
This list is not a ranking and is not based on scores. It groups widely known providers by the way they deliver service, to help you build a shortlist. Products and ownership change often, so check each provider's current offer.
Global MDR specialists
- CrowdStrike (Falcon Complete): MDR built on CrowdStrike's own Falcon endpoint and XDR platform. A natural option if you already run Falcon.
- Arctic Wolf: a security operations service widely used by mid-sized companies, delivered through an assigned concierge security team.
- Sophos MDR: MDR on Sophos and third-party telemetry. Sophos completed its acquisition of Secureworks in February 2025, bringing in the Taegis XDR platform and Counter Threat Unit research.
- Microsoft Defender Experts: Microsoft's own managed detection and response for organisations standardised on Microsoft Defender and Microsoft 365.
- Mandiant (Google Cloud): best known for incident response and threat intelligence, with managed defence services alongside.
Large MSSPs and telecom-backed providers
- LevelBlue: the former AT&T Cybersecurity business, which added Trustwave in 2025. Broad managed security with network heritage.
- Orange Cyberdefense: the Orange Group's cybersecurity business, with SOCs and CERT teams across Europe, including the Nordics.
- IBM: managed security services backed by X-Force threat intelligence and incident response, typically for large and complex enterprises.
IT services firms with security operations
Large Indian IT services firms such as TCS, Infosys, Wipro and HCLTech run managed security services from global security operations centres, often bundled with infrastructure and application outsourcing. They suit enterprises that want security inside a wider outsourcing contract.
Regional and cloud-focused providers
Regional specialists, such as Truesec in Sweden, offer local-language SOCs, incident response and knowledge of national regulation. Cloud-focused managed service providers combine security monitoring with operation of the cloud platform itself, so the team that sees an alert can also change the AWS or Azure configuration. Opsio, the publisher of this article, is in this group.
Which type fits which buyer?
| Provider type | Typical strengths | Watch-outs |
|---|---|---|
| Global MDR specialist | Mature detection on their own platform, fast containment, large threat data | Platform lock-in; less help with cloud configuration and compliance work |
| Large MSSP / telecom | Breadth of services, global coverage, network and firewall management | Can feel standardised; check who your analysts actually are |
| IT services firm | Scale, bundling with outsourcing, offshore cost model | Response authority and escalation can be slow across contract layers |
| Regional or cloud-focused provider | Local language and law, closer relationship, can fix cloud issues directly | Smaller teams; confirm 24/7 staffing and depth in incident response |
How to choose a managed security service provider
1. Map coverage to your estate
List your log sources: endpoints, identity (Microsoft Entra ID, Okta), email, firewalls, AWS, Azure, Google Cloud, Kubernetes and key SaaS. Ask each provider which sources they ingest natively, which need custom work, and which they cannot cover. Cloud and identity gaps are the most common.
2. Define response, not only monitoring
"24/7 monitoring" can mean an analyst wakes up your on-call engineer, or it can mean the provider isolates a laptop and disables an account within minutes. Agree in writing which containment actions the provider may take without asking, and the contracted time to triage and to respond for each severity level.
3. Check people and process
- Where is the SOC, who works nights and weekends, and what languages do they speak?
- How are analysts tiered, and how fast does an alert reach a senior analyst?
- Will you have a named service manager and regular reviews?
- Is incident response included, or a separate retainer?
4. Verify credentials yourself
Ask for the SOC's own SOC 2 Type II report or ISO/IEC 27001 certificate and check its scope covers the service you are buying. Ask for two or three references in your sector and size, and talk to them about response times and communication, not just tools.
5. Align with your framework and regulation
Ask the provider to map the service to a recognised framework. The NIST Cybersecurity Framework 2.0 works well for this: which Detect, Respond and Recover outcomes does the provider own, and which remain yours? For EU companies in scope of NIS2, check that the provider can support the 24-hour early warning and 72-hour incident notification in Article 23, and that its contract reflects your supply chain duties.
6. Run a proof of concept
A 30-day pilot on a representative slice of your estate shows more than any demo. Measure alert quality, time to triage and the clarity of reports. Run a simulated attack, such as a test credential theft, and see what happens.
7. Read the exit terms
Make sure you keep your logs, detections and documentation if you leave, and that the provider's agents can be removed cleanly. Proprietary platforms make switching harder.
A simple evaluation scorecard
Score each shortlisted provider from 1 to 5 on the criteria below and weight them to your priorities. Base scores on evidence from the pilot and references, not on sales material.
| Criterion | Evidence to ask for | Suggested weight |
|---|---|---|
| Coverage of your log sources | Integration list mapped to your inventory | High |
| Response authority and speed | Contracted triage and response times; containment RACI | High |
| Detection quality | Pilot results, false positive rate, simulated attack outcome | High |
| Cloud and identity depth | Named runbooks for AWS, Azure and Entra ID incidents | Medium to high |
| Compliance support | Sample NIS2, ISO/IEC 27001 or SOC 2 evidence reports | Medium |
| Service management | Named contact, review cadence, escalation path | Medium |
| Commercials and exit | Full price for your volumes, data return terms | Medium |
Red flags when evaluating MSSPs
- No contracted response times, or SLAs that only cover "acknowledgement".
- Vague answers on which log sources are included in the price.
- No sample report, or reports that only count alerts.
- Certifications that cover the company's head office but not the SOC service.
- Pressure to replace every tool you own with theirs before they can start.
- No clear answer on who is accountable during a major incident.
Third parties are a growing attack path in their own right: Verizon's 2025 Data Breach Investigations Report found third-party involvement in breaches doubled to 30%. Treat your security provider's own security as part of the evaluation.
What does an MSSP cost?
Pricing depends on the number of users, endpoints and log sources, the volume of data ingested, the level of response and the compliance reporting you need. Common models are per user, per device, per GB of logs and tiered packages. Our guide to managed security services pricing explains each model and the hidden costs to check.
How Opsio helps
Opsio provides managed security services, a 24/7 SOC and managed detection and response for companies running on AWS and Azure, from Karlstad in Sweden and Bangalore in India. Because we also operate cloud platforms, the same team can investigate an alert and fix the misconfiguration behind it.
For coffee roaster Löfbergs, which falls under NIS2, Opsio acts as end-to-end compliance partner in four phases: a gap analysis against NIS2, a prioritised roadmap, implementation of controls such as incident handling, access control, logging and monitoring, and ongoing compliance support. Read the Löfbergs NIS2 case (in Swedish).
Frequently asked questions
Who is the best managed security service provider?
No provider is best for everyone. Global MDR specialists suit companies that want fast, hands-on response on one platform; large MSSPs suit broad outsourcing; regional and cloud-focused providers suit companies that want local language, regulation knowledge and cloud operations in one team.
What is the difference between an MSSP and MDR?
An MSSP manages a broad set of security functions and often alerts you to threats. An MDR provider focuses on detection and hands-on response, containing threats itself within agreed rules. Many providers now offer both.
What is a managed SOC or SOC as a service?
It is a security operations centre run by a provider that monitors and investigates alerts from your tools around the clock. You get the analysts and processes of a SOC without hiring and staffing one yourself.
Do we still need internal security staff if we use an MSSP?
Yes, at least someone who owns security risk, manages the provider and makes decisions during incidents. In a co-managed model your team also handles parts of the investigation and remediation.
Can an MSSP monitor AWS, Azure and Google Cloud?
Most can ingest cloud audit logs and native threat findings, but depth varies. Ask how they handle CloudTrail, Microsoft Entra ID and Defender for Cloud alerts, and whether they can act on cloud resources or only notify you.
How long does it take to onboard an MSSP?
Plan for several weeks to a few months, depending on the number of log sources, agent rollout and tuning. Start with the highest-risk sources, such as identity, endpoints and cloud control planes, and add the rest in phases.
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About the Author
Group COO & CISO
Fredrik is the Group Chief Operating Officer and Chief Information Security Officer at Opsio. He focuses on operational excellence, governance, and information security, working closely with delivery and leadership teams to align technology, risk, and business outcomes in complex IT environments. He leads Opsio's security practice including SOC services, penetration testing, and compliance frameworks.
Editorial standards: This article was written by a certified practitioner, named in the byline above. We revise it when the technology or regulation it covers changes; the dates above show the latest update. Opsio maintains editorial independence — we recommend solutions on technical merit, not commercial relationships.
