CISO Tribune

Vendor comparison · 2 companies

eSentire vs Quorum Cyber

eSentire sells MDR with multi-signal attack surface coverage and 24/7 Elite threat hunters working as one continuous security program across any vendor stack. eSentire offers 24/7 SOC-as-a-Service with unlimited threat hunting and incident handling. eSentire describes Multi-Signal MDR with 300+ technology integrations to support existing investments. Quorum Cyber delivers Microsoft-first, threat-led cyber security services. CISO Tribune files both under MDR and managed SOC and Incident response and forensics. 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.

Change the companies

Up to four companies side by side.

  • eSentire
  • Quorum Cyber
eSentire vs Quorum Cyber: Products, Customers and Funding Compared
eSentireeSentire sells MDR with multi-signal attack surface coverage and 24/7 Elite threat hunters working as one continuous security program across any vendor stack. eSentire offers 24/7 SOC-as-a-Service with unlimited threat hunting and incident handling. eSentire describes Multi-Signal MDR with 300+ technology integrations to support existing investments.esentire.comQuorum CyberQuorum Cyber delivers Microsoft-first, threat-led cyber security services.quorumcyber.com
What it sells
  • Atlas Preempt[3][5]Deploys AI Operatives to continuously validate attack paths.
  • Atlas MDR[5]MDR sold in Professional, Enhanced and Elite packages.
  • 24/7 SOC-as-a-Service[5]24/7 SOC-as-a-Service with unlimited threat hunting and incident handling.
  • 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
Canada[2]Edinburgh, United Kingdom[1]
Founded
2001[2][5]Not 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
  • September 15, 2026eSentire announced it acquired a stealth-mode AI security startup and incorporated its product and technology into the Atlas Platform as Atlas AIDR.[6]
  • 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
From its own pages, the company sells mainly to organisations that want to extend their own team with a 24/7 Security Operations Center. Its industry pages speak of protecting insurance operations, defending financial services, defending patient data and clinical operations, protecting portfolio companies, and stopping threats before they disrupt production. The pages also say Atlas connects to any signal across your current security tools, which reads as a fit for teams that already run security tools. The security operations center entry names boards, regulators, and cyber insurers as parties that require a human accountability layer.Not written yet
Last verified
November 2, 2026October 7, 2026

Where they overlap

  • MDR and managed SOC is the primary category of both eSentire and Quorum Cyber; both are also filed under Incident response and forensics.

Where they differ, field by field

  • eSentire is also filed under Exposure prioritisation and CTEM. Quorum Cyber is also filed under Security consulting and advisory and OT and ICS security.
  • eSentire lists Atlas Preempt, Atlas MDR and 24/7 SOC-as-a-Service. Quorum Cyber lists Clarity Defend, Clarity Extend, Clarity Protect, Clarity Data & AI, Clarity OT and 1 more.
  • eSentire is headquartered in Canada. Quorum Cyber is headquartered in Edinburgh, United Kingdom.
  • eSentire was founded in 2001.

How they differ

CISO Tribune files both Quorum Cyber and eSentire primarily under MDR and managed SOC, and also under incident response and forensics. In that filing, eSentire also sits under exposure prioritisation and CTEM, while Quorum Cyber also sits under OT and ICS security. The eSentire lineup includes Atlas MDR in Professional, Enhanced and Elite packages, a 24/7 SOC-as-a-Service, and Atlas Preempt, which deploys AI Operatives to continuously validate attack paths. Quorum Cyber describes its services as Microsoft-first and sells Clarity Defend for managed detection and response, Clarity OT for operational technology environments, and Clarity Data & AI for data governance. Quorum Cyber also sells Incident Response Services with retainer agreements and emergency MDR for breach investigation and containment.

Based in Canada, eSentire was founded in 2001 and says it protects thousands of organizations across 35+ industries. The eSentire industry pages cover insurance, financial services, patient data and clinical operations, portfolio companies, dealerships, and public sector and education. Quorum Cyber was founded in Edinburgh in 2016, is headquartered in Edinburgh, United Kingdom, has over 350 employees across the UK, US, Canada and UAE, and states that it protects 400+ organisations across four continents.

On September 15, 2026, eSentire announced it acquired a stealth-mode AI security startup and incorporated its technology into the Atlas Platform as Atlas AIDR. On September 16, 2026, Quorum Cyber announced a definitive agreement to acquire Ontinue, a managed extended detection and response provider, following two acquisitions in 2024.

What it sells: eSentire

What Atlas MDR does[5]
Atlas MDR comes in three packages, Professional, Enhanced and Elite, so a customer can choose the level of 24/7 coverage, log retention, threat hunting and offensive testing. One package adds log detection, Atlas SIEM with 90-day retention, round-the-clock threat hunting, automated response, and quarterly offensive testing.

Questions about eSentire and Quorum Cyber

What do eSentire and Quorum Cyber sell?
eSentire sells Atlas Preempt, Atlas MDR and 24/7 SOC-as-a-Service. Quorum Cyber sells Clarity Defend, Clarity Extend, Clarity Protect, Clarity Data & AI, Clarity OT and 1 more.
Are eSentire and Quorum Cyber in the same category?
Yes. MDR and managed SOC is the primary category of both on CISO Tribune.
Where are eSentire and Quorum Cyber headquartered?
eSentire is headquartered in Canada. Quorum Cyber is headquartered in Edinburgh, United Kingdom.
When were eSentire and Quorum Cyber founded?
eSentire was founded in 2001.
Who are eSentire and Quorum Cyber sold to?
From its own pages, the company sells mainly to organisations that want to extend their own team with a 24/7 Security Operations Center.
What have eSentire and Quorum Cyber announced recently?
September 15, 2026: eSentire announced it acquired a stealth-mode AI security startup and incorporated its product and technology into the Atlas Platform as Atlas AIDR. September 16, 2026: Quorum Cyber announced that it has signed a definitive agreement to acquire Ontinue, a managed extended detection and response provider.

About eSentire

eSentire sells MDR with multi-signal attack surface coverage and 24/7 Elite threat hunters working as one continuous security program across any vendor stack. eSentire offers 24/7 SOC-as-a-Service with unlimited threat hunting and incident handling. eSentire describes Multi-Signal MDR with 300+ technology integrations to support existing investments.[1]

Atlas connects to any signal across any vendor stack and powers adaptive AI Operatives that expose, detect, and neutralize cyberattacks. Atlas connects to any signal across a customer's current security tools, and eSentire says that whatever a customer is running, eSentire is running with them. Atlas Preempt deploys AI Operatives to continuously validate attack paths exposing attacker targets of opportunity before they take advantage.

eSentire says its SOC extends a customer's team with immediate expertise, hands-on remediation, and the human accountability layer that boards, regulators, and cyber insurers require. eSentire says customers can see what its SOC sees, review investigations, and see how eSentire is protecting their business. Response and Remediation pairs machine-speed containment with human judgment, delivering full threat response that is policy-bounded, reversible, and explainable. eSentire offers unlimited Incident Response with a threat suppression guarantee, anytime, anywhere.

Atlas MDR comes in three packages, Professional, Enhanced and Elite, so a customer can choose the level of 24/7 coverage, log retention, threat hunting and offensive testing. In that package, eSentire analysts watch the customer's environment around the clock.

eSentire says it protects thousands of organizations across 35+ industries around the world. eSentire was founded in 2001, and its Controlled Autonomy SecOps operating model pairs agentic AI operatives with engineered human-judgment controls. eSentire provides cybersecurity solutions for Managed Security Service Providers (MSSPs), Managed Service Providers (MSPs), and Value-Added Resellers (VARs). eSentire is the official cybersecurity partner of AVFC.

eSentire sets out to protect insurance operations from cyber attacks. eSentire sets out to defend financial services from cyber disruption. eSentire sets out to protect portfolio companies from cyber risk. eSentire sets out to defend patient data and clinical operations. eSentire sets out to secure dealership operations and customer data. eSentire sets out to protect public sector and education systems.

eSentire on the record

Sources

eSentire full record

  1. [1]Esentire managed detection and responseeSentire · esentire.com · undated page, accessed September 27, 2026 · Tier A
  2. [2]Security You Can Trust. Protecting Organizations Worldwide. | eSentireeSentire · undated page, accessed September 27, 2026 · Tier A
  3. [3]Company | eSentireeSentire · undated page, accessed October 24, 2026 · Tier A
  4. [4]eSentire Reviews 2026: Details, Pricing, & Features | G2G2 · undated page, accessed October 24, 2026 · Tier C
  5. [5]Managed Detection and Response Pricing and Packaging | eSentireeSentire · undated page, accessed November 3, 2026 · Tier A
  6. [6]eSentire Acquires Stealth-Mode AI Security Startup, Bringing New AI Observability and Control to the Atlas PlatformBusiness Wire · published September 15, 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

Spot a factual error? Request a correction.