What Is a Managed SOC?
A managed SOC (Security Operations Centre) is an outsourced, 24/7 security team that monitors your IT environment, investigates alerts, and contains threats on your behalf. Instead of building an in-house team, tooling, and round-the-clock rota, you subscribe to the capability as a monthly service.
For most UK organisations, running a Security Operations Centre in-house is neither affordable nor practical. A managed SOC gives you the same continuous detection and response capability that large enterprises operate internally, delivered by a specialist provider from around £900 per month.
This guide explains what a SOC is, how a managed SOC works, what it monitors, how it differs from an MSSP, MDR and a SIEM, and how to work out whether you need one.
What Is a SOC (Security Operations Centre)?
A Security Operations Centre (SOC) is the combination of people, process, and technology that continuously monitors an organisation for cyber threats and responds when one is found. The term "SOC" refers both to the physical or virtual facility and to the team of analysts who staff it.
A SOC does three things around the clock:
- Detect: collect and correlate security signals from across the estate to spot suspicious activity.
- Investigate: have human analysts triage those signals, separating real threats from noise.
- Respond: contain confirmed threats before they spread, and guide remediation.
The key word is continuous. Attackers do not keep office hours; a ransomware operator will happily encrypt your network at 2am on a bank holiday. A SOC exists so that someone is always watching.
What Is a Managed SOC?
A managed SOC is a SOC that you outsource to a specialist provider rather than build and staff yourself. The provider supplies the analysts, the monitoring platform (a SIEM), the detection engineering, and the 24/7 rota, and you pay a monthly subscription for the service.
This is sometimes also called SOC as a Service (SOCaaS) or an outsourced SOC. The distinctions are largely commercial: a managed SOC is the capability, SOC as a Service is the per-endpoint subscription model, and an outsourced SOC is the same idea framed against the cost of building in-house.
The reason organisations choose a managed SOC is simple. A credible in-house SOC needs at least five analysts to cover 24/7 shifts, a SIEM platform, threat intelligence feeds, and management, which runs well over £210,000 per year in salaries alone. A managed SOC delivers equivalent coverage from £900 per month and is operational in weeks, not months.
How Does a Managed SOC Work?
A managed SOC follows the same detect, investigate, respond cycle, delivered as a service:
- Log collection: the provider connects to your log sources: endpoints, servers, cloud platforms, identity systems, firewalls, and email. These feed into a SIEM (Security Information and Event Management) platform such as Microsoft Sentinel or Elastic.
- Correlation and detection: the SIEM correlates signals across those sources using detection rules, raising alerts when activity matches a known attack pattern or looks anomalous.
- Human triage: this is what separates a managed SOC from a tool. Analysts investigate each alert, discard false positives, and confirm genuine threats. A SIEM without a SOC just generates alerts nobody is watching.
- Response: when a threat is confirmed, analysts contain it (isolating a device, disabling an account), preserve evidence, and escalate to your team with clear guidance.
- Continuous tuning: detection rules are refined to your environment over time, reducing noise and improving accuracy.
What Does a Managed SOC Monitor?
A good managed SOC correlates signals across your whole estate, not just one layer:
| Layer | What it watches for |
|---|---|
| Endpoints (EDR) | Malware execution, ransomware behaviour, suspicious processes |
| Network | Lateral movement, command-and-control traffic, data exfiltration |
| Identity | Credential abuse, impossible-travel logins, privilege escalation |
| Cloud | Misconfigurations, suspicious API activity, risky sign-ins |
| Email / SaaS | Phishing, business email compromise, account takeover |
Correlating across these layers is what lets a SOC catch multi-stage attacks that single-point tools miss.
Managed SOC vs MSSP vs MDR vs SIEM
These terms are often used interchangeably, but they describe different things:
| Term | What it is |
|---|---|
| SIEM | The technology that collects and correlates logs and raises alerts. A tool, not a team. |
| SOC | The people and process that use the SIEM to detect, investigate, and respond 24/7. |
| MSSP | A Managed Security Service Provider that manages security products (firewalls, antivirus) and typically forwards alerts to you to action. |
| MDR | Managed Detection and Response: an endpoint- and cloud-focused managed service that actively investigates and responds, rather than just forwarding alerts. |
In short: a SIEM is the platform, an MSSP manages tools and forwards alerts, MDR actively responds on endpoints and cloud, and a managed SOC is the broadest of these, correlating across the whole estate with human-led response. For a full side-by-side, see our MDR vs SOC vs SIEM buyer's guide.
Managed SOC vs In-House SOC
| Managed SOC | In-house SOC | |
|---|---|---|
| Typical cost | From £900/month | £210,000+/year (salaries alone) |
| Time to operational | 2 to 3 weeks | 6 to 12 months |
| 24/7 coverage | Included | Needs 5+ analysts on rotation |
| Tooling and licensing | Included in the fee | Separate cost |
| Detection engineering | Provided | Must be recruited |
For most organisations under around 1,000 employees, a managed SOC delivers better security outcomes at a fraction of the cost of building in-house.
How Much Does a Managed SOC Cost?
Managed SOC pricing in the UK is billed as a fixed monthly subscription:
- Small organisations (50 to 100 users): from £900/month.
- Mid-sized (100 to 500 users): typically £3,000 to £4,000/month.
- Large enterprises (500+ users): £8,000 to £12,000+/month.
Pricing scales with the number of users and endpoints, the volume of log sources, and the service tier. For a full breakdown, including what drives the cost and how it compares to an in-house build, see our managed SOC cost guide.
Do You Need a Managed SOC?
A managed SOC is worth considering if any of the following apply:
- You have no 24/7 security monitoring, so threats outside office hours go unseen until Monday.
- Your internal IT team is stretched and cannot keep up with security alerts.
- Your cyber insurer, or a framework such as ISO 27001 or Cyber Essentials Plus, expects continuous monitoring.
- You hold sensitive data or operate in a regulated sector (finance, healthcare, legal, public sector).
- You have suffered a breach or near-miss and want assurance it will be caught next time.
How to Choose a Managed SOC Provider
Not all managed SOC services are equal. Ask any provider:
- Is it staffed 24/7 by human analysts? Some "SOC" offerings are automated alerting with no one investigating.
- Where are the analysts based? UK-based analysts matter for data handling, response times, and regulated sectors.
- Is incident response included? Watch for per-incident fees billed on top of the headline price.
- What is the analyst-to-client ratio and response SLA? Vague answers suggest tooling, not a staffed SOC.
- Are they accredited? CREST SOC accreditation is independent validation of the SOC's people, process, and technology.
Precursor Security operates a CREST-accredited managed SOC from a physical facility in Newcastle, staffed 24/7 by UK-based, DBS-checked analysts, with incident response included as standard.
Frequently Asked Questions
What does SOC stand for? SOC stands for Security Operations Centre: the team and technology that monitors an organisation for cyber threats and responds to them around the clock.
Is a managed SOC the same as SOC as a Service? Effectively yes. SOC as a Service is the subscription model for a managed SOC, usually priced per endpoint. Both mean an outsourced, 24/7 security operations capability.
What is the difference between a managed SOC and an MSSP? An MSSP manages security products and typically forwards alerts to your team. A managed SOC investigates and responds to those alerts 24/7 with human analysts.
How quickly can a managed SOC be set up? Most organisations are fully operational within 2 to 3 weeks, versus 6 to 12 months to build an in-house SOC.
Ready to talk numbers? See the managed SOC cost guide or get in touch for a fixed monthly quote.