CISO Tribune

Vendor comparison · 2 companies

Expel vs Quorum Cyber

Expel sells managed detection and response (MDR) delivered through its Workbench platform, with 24x7 human analysts working in the security tools a customer already has. Quorum Cyber delivers Microsoft-first, threat-led cyber security services. CISO Tribune files both under MDR and managed SOC. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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  • Expel
  • Quorum Cyber
Expel vs Quorum Cyber: Products, Customers and Funding Compared
ExpelExpel sells managed detection and response (MDR) delivered through its Workbench platform, with 24x7 human analysts working in the security tools a customer already has.expel.comQuorum CyberQuorum Cyber delivers Microsoft-first, threat-led cyber security services.quorumcyber.com
What it sells
  • Expel MDR[5][7]A managed detection and response service that works with the security tools a customer already has.
  • Ruxie[3][5]Expel's AI and automation engine used in its MDR service.
  • Clarity Defend[1][3][6]Managed detection and response service providing 24/7 monitoring, detection and response to attacks.
  • Clarity Extend[1][3]Enhanced security coverage extending monitoring to Microsoft Cloud and third-party technologies across an organization's IT ecosystem.
  • Clarity Protect[1][3]Service that detects and stops threats, reduces cyber risk, and strengthens security across Microsoft and AI environments, including a CTEM offering.
  • Clarity Data & AI[1][3]Service that helps organizations understand, protect and govern data, reducing exposure to insider threats and AI-related risks.
  • Clarity OT[3]Managed detection and response service for operational technology environments.
  • Incident Response Services[3]Services including incident response preparedness, retainer agreements, and emergency MDR for breach investigation and containment.
Categories
Headquarters
Not stated on its pagesEdinburgh, United Kingdom[1]
Founded
Not stated on its pagesNot stated on its pages
Ownership and funding
Not stated on its pagesNot stated on its pages
Named customers
Not stated on its pagesNot stated on its pages
Recent news
Not stated on its pages
  • September 16, 2026Quorum Cyber announced that it has signed a definitive agreement to acquire Ontinue, a managed extended detection and response provider.[12]
G2 and Gartner Peer Insights
  • G2: listed, seen November 3, 2026[4]
  • Gartner Peer Insights: Not stated on its pages
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
Who it fits
Not written yetNot written yet
Last verified
September 27, 2026October 7, 2026

Where they overlap

  • MDR and managed SOC is the primary category of both Expel and Quorum Cyber.

Where they differ, field by field

  • Quorum Cyber is also filed under Incident response and forensics, Security consulting and advisory and OT and ICS security.
  • Expel lists Expel MDR and Ruxie. Quorum Cyber lists Clarity Defend, Clarity Extend, Clarity Protect, Clarity Data & AI, Clarity OT and 1 more.
  • Quorum Cyber is headquartered in Edinburgh, United Kingdom.

How they differ

CISO Tribune files both Expel and Quorum Cyber under MDR and managed SOC as the primary category. Expel sells Expel MDR, a managed detection and response service that works with the security tools a customer already has, delivered through its Workbench platform with 24x7 analysts. Expel also sells Ruxie, its AI and automation engine, and offers email threat detection and response. Expel states a 14-minute mean time to remediate and more than 160 technology integrations, naming Microsoft, AWS, Google Cloud, CrowdStrike, Okta and Wiz among them.

Quorum Cyber is headquartered in Edinburgh, United Kingdom, and CISO Tribune also files it under incident response and forensics, security consulting and advisory, and OT and ICS security. Its products include Clarity Defend, a managed detection and response service, Clarity Extend, which extends monitoring to Microsoft Cloud and third-party technologies, and Clarity OT, for operational technology environments. It also sells Clarity Protect, Clarity Data & AI and Incident Response Services that include retainer agreements. Quorum Cyber describes its services as Microsoft-first and is a Microsoft Solutions Partner for Security.

Both companies sell MDR, but Expel's records center on that service with email detection and AI attack surface coverage, while Quorum Cyber's span MDR, data security, OT and incident response. Quorum Cyber states that it protects 400+ organisations across four continents. On September 16, 2026, Quorum Cyber announced a definitive agreement to acquire Ontinue, a managed extended detection and response provider.

What it sells: Expel

What Expel MDR does[5][7]
Expel MDR provides 24x7 SOC monitoring, with analysts who investigate and respond. Expel says it connects to an existing stack and correlates threats across endpoint, identity, cloud, network, SaaS and more. Expel states a 14-minute mean time to remediate.
What Ruxie does[3][5]
Expel says Ruxie gathers evidence, enriches alerts and matches patterns in seconds. Expel analysts then investigate and make the critical calls.

Questions about Expel and Quorum Cyber

What do Expel and Quorum Cyber sell?
Expel sells Expel MDR and Ruxie. Quorum Cyber sells Clarity Defend, Clarity Extend, Clarity Protect, Clarity Data & AI, Clarity OT and 1 more.
Are Expel and Quorum Cyber in the same category?
Yes. MDR and managed SOC is the primary category of both on CISO Tribune.
Where are Expel and Quorum Cyber headquartered?
Quorum Cyber is headquartered in Edinburgh, United Kingdom.
What have Expel and Quorum Cyber announced recently?
September 16, 2026: Quorum Cyber announced that it has signed a definitive agreement to acquire Ontinue, a managed extended detection and response provider.

About Expel

Expel sells managed detection and response (MDR) delivered through its Workbench platform, with 24x7 human analysts working in the security tools a customer already has. Expel says its service is built so that technology makes it fast and humans make it accurate.[5]

Expel describes the service as managed detection and response with analysts who can be reached directly over Slack or Teams. Expel says customers connect Workbench to their existing stack, and Expel then correlates threats across endpoint, identity, cloud, network, SaaS and more. Expel says no agents need to be deployed and no rip-and-replace is required.[5]

Ruxie is the name Expel gives its AI and automation engine. Expel says Ruxie gathers evidence, enriches alerts and matches patterns so that Expel analysts can investigate and make the critical calls. Expel states a 14-minute mean time to remediate for its MDR service.[5]

Expel Workbench is the platform through which customers see Expel's work. Expel says customers can see every investigation and response in real time inside Workbench.[5]

Expel says its MDR covers cloud, endpoint, identity, network, SaaS, email and more, across more than 160 technology integrations. Expel names Microsoft, AWS, Google Cloud, CrowdStrike, Okta and Wiz among those integrations.[5][10]

Expel also offers email threat detection and response, in which Expel says it monitors the email environment 24x7. Expel says this works alongside Proofpoint, Mimecast, Abnormal Security and Sublime. Expel also describes MDR coverage of the AI attack surface, covering attacker use of AI, employee misuse of AI tools and attacks on customer-built AI systems, with detections mapped to MITRE ATLAS.[6][7]

Expel was started by practitioners. Dave Merkel is co-founder and Chief Executive Officer, Justin Bajko is a co-founder and Chief Strategy Officer, and Yanek Korff is a co-founder and Chief Operating Officer. Greg Notch is Chief Technology Officer.[8]

2. Expel says Workbench infrastructure runs on GCP and AWS in the U.S, and that alert data is retained up to 15 months, configurable per contract.[1][2][5][9]

Expel on the record

Sources

Expel full record

  1. [1]Workbench operations platformExpel · expel.com · published August 5, 2026 · Tier A
  2. [2]Expel announces 20 million in series b fundingExpel · expel.com · undated page, accessed September 27, 2026 · Tier A
  3. [3]Leading managed detection and response (MDR) provider | ExpelExpel · undated page, accessed October 24, 2026 · Tier A
  4. [4]Expel Reviews 2026: Details, Pricing, & Features - G2G2 · undated page, accessed October 24, 2026 · Tier C
  5. [5]Managed Detection and Response Services | Expel MDRExpel · undated page, accessed November 3, 2026 · Tier A
  6. [6]Email threat detection | ExpelExpel · undated page, accessed November 3, 2026 · Tier A
  7. [7]AI attack surface coverage | ExpelExpel · undated page, accessed November 3, 2026 · Tier A
  8. [8]Company | ExpelExpel · undated page, accessed November 3, 2026 · Tier A
  9. [9]Security and compliance support from your MDR | ExpelExpel · undated page, accessed November 3, 2026 · Tier A
  10. [10]Managed Security Solutions | ExpelExpel · undated page, accessed November 3, 2026 · Tier A

Quorum Cyber full record

  1. [1]quorumcyber.comQuorum Cyber · quorumcyber.com · undated page, accessed October 7, 2026 · Tier A
  2. [2]Difenda will rebrand as quorum cyberQuorum Cyber · quorumcyber.com · undated page, accessed October 7, 2026 · Tier A
  3. [3]Microsoft Cyber Security Services Provider | Quorum CyberQuorum Cyber · undated page, accessed October 31, 2026 · Tier A
  4. [4]About Quorum | Cyber Security CompanyQuorum Cyber · undated page, accessed November 10, 2026 · Tier A
  5. [5]Why I’m Passionate about Protecting British Organisations from Cybercrime - Quorum CyberQuorum Cyber · undated page, accessed November 10, 2026 · Tier A
  6. [6]Managed Security Services | Quorum CyberQuorum Cyber · undated page, accessed November 10, 2026 · Tier A
  7. [7]Cyber Resilience Assessment | Quorum CyberQuorum Cyber · undated page, accessed November 10, 2026 · Tier A
  8. [8]Quorum Cyber Managed XDR integrates with Microsoft Security Technology - Quorum CyberQuorum Cyber · undated page, accessed November 10, 2026 · Tier A
  9. [9]Quorum Cyber is leveraging Copilot for Security at scale - Quorum CyberQuorum Cyber · undated page, accessed November 10, 2026 · Tier A
  10. [10]Customers Informed of Microsoft Data Breach - Quorum CyberQuorum Cyber · undated page, accessed November 10, 2026 · Tier A
  11. [11]Quorum Cyber appoints Chief Information Security OfficerQuorum Cyber · undated page, accessed November 10, 2026 · Tier A
  12. [12]Quorum Cyber Announces Intent to Acquire Ontinue, Building an Unrivaled Microsoft-First Agentic SOC for the Autonomous Threat EraPRNewswire · published September 16, 2026 · Tier A

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