Managed Security Service Providers: 6 Companies compared
Managed Security Service Providers and MDR firms compared on services, EDR-stack neutrality, transparency posture, and delivery model. From vendor-neutral cloud-native MDR to traditional 24/7 SOC outsourcing.
Quick comparison
All managed security service providers companies side by side, alphabetical.
| Company | Founded | Engagement | Specialism | Standards / accreditations |
|---|---|---|---|---|
| Arctic Wolf | 2012 | Per-asset managed service (annual contract) | Organizations without in-house security expertise wanting fully managed vulnerability sca… | — |
| Critical Start | 2012 | Subscription per integrated surface | Mid-market and enterprise teams that already own EDR/XDR and want managed response with s… | SOC 2 Type II |
| eSentire | 2001 | Subscription tiers (Atlas Essentials / Advanced / Complete) | Financial services, legal, and insurance firms that want a mature MDR partner with deep v… | SOC 2 Type IIISO 27001 |
| Expel | 2016 | Subscription per integrated surface | Teams that already own a quality EDR/SIEM/cloud stack and want a transparent, vendor-neut… | SOC 2 Type II |
| Red Canary (a Zscaler company) | 2013 | Subscription per managed surface | Microsoft-centric organisations wanting Defender / Sentinel telemetry analysed by a high-… | SOC 2 Type II |
| Secureworks (a Sophos company) | 1999 | Subscription + project services | Mid-to-large enterprises wanting a vendor-open MDR with strong threat intel and an embedd… | SOC 2 Type IIISO 27001PCI DSS |
Arctic Wolf
Enterprise Vulnerability ManagementOrganizations without in-house security expertise wanting fully managed vulnerability scanning and prioritized remediation guidance
Arctic Wolf is a managed security operations platform that includes managed vulnerability management as part of its Concierge Security approach. Rather than providing a self-service vulnerability scanning tool, Arctic Wolf assigns dedicated security engineers (the Concierge Security Team) who configure, run, and interpret vulnerability scans on the customer's behalf, delivering prioritized remediation guidance. This managed approach targets organizations that lack in-house vulnerability management expertise and want a turnkey service rather than a platform they must operate themselves.
What people say works
- ✓Fully managed service eliminates need for in-house VM expertise
- ✓Dedicated Concierge Security Team provides personalized guidance
- ✓Combined with Arctic Wolf MDR for unified security operations
Common considerations
- ✕Limited control over scanning configuration and scheduling
- ✕Higher cost than self-managed tools for organizations with existing expertise
- ✕Scanning depth depends on Arctic Wolf's tooling, not customer choice
Critical Start
Managed Security Service ProvidersMid-market and enterprise teams that already own EDR/XDR and want managed response with strong noise reduction
Founded in 2012 by Rob Davis to address alert fatigue, Critical Start's Trusted Behavior Registry (TBR) auto-resolves known-good behaviours at scale so analysts focus on true positives. The MOBILESOC iOS/Android app lets customers triage, escalate, and contain incidents from a phone. The firm runs MDR across multiple third-party EDR/XDR/SIEM stacks rather than shipping its own endpoint agent.
What people say works
- ✓Trusted Behavior Registry materially reduces alert noise at scale
- ✓MOBILESOC is one of the more mature mobile SOC apps in the MDR market
- ✓Multi-EDR / multi-XDR coverage gives customers stack optionality
Common considerations
- ✕Smaller scale than Arctic Wolf, Sophos/Secureworks, or eSentire
- ✕Service quality depends on customers having a supported EDR/XDR already licensed
- ✕Limited public pricing
eSentire
Managed Security Service ProvidersFinancial services, legal, and insurance firms that want a mature MDR partner with deep vertical playbooks
eSentire is one of the longest-operating pure-play MDR firms, protecting more than 2,000 organisations across 80+ countries. Its proprietary Atlas platform ingests signals across the customer's vendor stack and powers the firm's 24/7 SOC, threat hunting, and incident response. It runs an in-house Threat Response Unit (TRU) for original research and is well known for deep specialisation in financial services, legal, and insurance verticals.
What people say works
- ✓One of the most established pure-play MDR providers (operating since 2001)
- ✓Strong vertical playbooks for financial services and legal, including hedge fund and law-firm specialisation
- ✓Vendor-broad Atlas platform reduces lock-in to a single EDR
Common considerations
- ✕Premium pricing; not positioned for the very low end of SMB
- ✕Atlas terminology has shifted across MDR / XDR / agentic AI; clarify current taxonomy in contract
- ✕Limited public pricing
Expel
Managed Security Service ProvidersTeams that already own a quality EDR/SIEM/cloud stack and want a transparent, vendor-neutral SOC layered on top
Founded in May 2016 by ex-Mandiant/FireEye veterans Dave Merkel, Justin Bajko, and Yanek Korff, Expel takes a deliberate stance: no proprietary agent, full transparency into SOC activity via the Workbench portal, and integration with whatever security tools the customer already owns. The company reached unicorn status in November 2021 and was named a Leader in The Forrester Wave for MDR Services, Q1 2025. Independent and private.
What people say works
- ✓Genuinely vendor-neutral: no Expel agent, integrates with existing EDR/SIEM/cloud stack
- ✓Transparent operations via Workbench (customers see every analyst action in real time)
- ✓Strong public commitments such as a 13-minute MTTR for critical threats
Common considerations
- ✕'Bring your own tech' means customers must already own (and license) suitable EDR/SIEM/cloud tooling
- ✕Premium pricing relative to bundled MSSP offerings
- ✕Limited public pricing; sales-led
Red Canary (a Zscaler company)
Managed Security Service ProvidersMicrosoft-centric organisations wanting Defender / Sentinel telemetry analysed by a high-fidelity detection-engineering team
Red Canary delivers managed detection and response built on detection engineering rigor and broad telemetry ingestion (Microsoft Defender, CrowdStrike, SentinelOne, Palo Alto, Zscaler, AWS, Google Cloud, 200+ tools). It is widely regarded as a reference partner for organisations standardising on Microsoft Defender for Endpoint and Sentinel. Zscaler closed the $692M acquisition on August 1, 2025; Red Canary operates as a separate business unit within Zscaler.
What people say works
- ✓Reputation as one of the strongest MDR partners for Microsoft-centric security stacks
- ✓Industry-recognised detection engineering and public threat research (annual Threat Detection Report)
- ✓Vendor-broad integrations — does not require ripping out incumbent EDR
Common considerations
- ✕Future roadmap will be shaped by Zscaler's strategy; long-term independence uncertain
- ✕Premium positioning; not the cheapest option in mid-market deals
- ✕Limited public pricing
Secureworks (a Sophos company)
Managed Security Service ProvidersMid-to-large enterprises wanting a vendor-open MDR with strong threat intel and an embedded SIEM, especially in regulated verticals
Secureworks pioneered the modern MSSP model and was majority-owned by Dell before its acquisition by Sophos in an $859M deal that closed February 2025. The Taegis platform (MDR, XDR, NDR, VDR, embedded SIEM) continues as a standalone, vendor-open product line within Sophos with native Sophos Endpoint integration. The Counter Threat Unit (CTU) remains a key differentiator.
What people say works
- ✓Counter Threat Unit is one of the longest-running in-house threat research teams
- ✓Taegis remains vendor-open / BYO-EDR even post-Sophos
- ✓Embedded SIEM removes the need for a separate Splunk-class deployment for many customers
Common considerations
- ✕Ongoing integration risk following the Sophos acquisition
- ✕Heritage SIEM/MSSP roots can mean a heavier deployment than newer cloud-native MDRs
- ✕Limited public list pricing
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About this listing
Managed Security Service Providers companies, listed alphabetically and compared on public information. How we work →