CISO Tribune

Vendor comparison · 2 companies

eSentire vs Nucleus Security

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. Nucleus Security sells vulnerability and exposure management software for enterprise organizations and government agencies. CISO Tribune files both under Exposure prioritisation and CTEM. 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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Up to four companies side by side.

  • eSentire
  • Nucleus Security
eSentire vs Nucleus Security: 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.comNucleus SecurityNucleus Security sells vulnerability and exposure management software for enterprise organizations and government agencies.nucleussec.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.
  • Nucleus Data Core[5]A system of record for assets, exposures, and threats.
  • Nucleus ServiceNow App connector[7]A connector that integrates with ServiceNow through the Nucleus Security for Vulnerability Response app.
Categories
Headquarters
Canada[2]Not stated on its pages
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]
Not stated on its pages
G2 and Gartner Peer Insights
  • G2: listed, seen November 3, 2026[4]
  • Gartner Peer Insights: Not stated on its pages
  • G2: listed, seen November 10, 2026[12]
  • 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, 2026November 8, 2026

Where they overlap

  • eSentire and Nucleus Security are both filed under Exposure prioritisation and CTEM.

Where they differ, field by field

  • eSentire's primary category is MDR and managed SOC; Nucleus Security's is Vulnerability management.
  • eSentire is also filed under Incident response and forensics. Nucleus Security is also filed under Threat intelligence.
  • eSentire lists Atlas Preempt, Atlas MDR and 24/7 SOC-as-a-Service. Nucleus Security lists Nucleus Data Core and Nucleus ServiceNow App connector.
  • eSentire is headquartered in Canada.
  • eSentire was founded in 2001.

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.

What it sells: Nucleus Security

What Nucleus Data Core does[5]
The Nucleus Data Core is a system of record for assets, exposures, and threats. The Nucleus Data Core transforms fragmented data into unified, live exposure context. Nucleus says every AI decision and action is grounded in the Nucleus Data Core.
What Nucleus ServiceNow App connector does[7]
The Nucleus ServiceNow App connector integrates directly with ServiceNow through the Nucleus Security for Vulnerability Response app. The app runs directly on a customer's ServiceNow environment and enables integration with Vulnerability Response. The app has several different integrations, including assets and vulnerable items.

Questions about eSentire and Nucleus Security

What do eSentire and Nucleus Security sell?
eSentire sells Atlas Preempt, Atlas MDR and 24/7 SOC-as-a-Service. Nucleus Security sells Nucleus Data Core and Nucleus ServiceNow App connector.
Are eSentire and Nucleus Security in the same category?
They share Exposure prioritisation and CTEM. eSentire's primary category is MDR and managed SOC and Nucleus Security's is Vulnerability management.
Where are eSentire and Nucleus Security headquartered?
eSentire is headquartered in Canada.
When were eSentire and Nucleus Security founded?
eSentire was founded in 2001.
Who are eSentire and Nucleus Security 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 Nucleus Security 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.

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

Nucleus Security full record

  1. [1]nucleussec.comNucleus Security · nucleussec.com · undated page, accessed November 8, 2026 · Tier A
  2. [2]PlatformNucleus Security · nucleussec.com · undated page, accessed November 8, 2026 · Tier A
  3. [3]Nucleus Vulnerability & Exposure Management SolutionsNucleus Security · undated page, accessed November 10, 2026 · Tier A
  4. [4]Nucleus Security | Vulnerability and Exposure ManagementNucleus Security · undated page, accessed November 10, 2026 · Tier A
  5. [5]Nucleus Vulnerability Management PlatformNucleus Security · undated page, accessed November 10, 2026 · Tier A
  6. [6]Vulnerability Remediation with NucleusNucleus Security · undated page, accessed November 10, 2026 · Tier A
  7. [7]ServiceNow App for Vulnerability ResponseNucleus Security · undated page, accessed November 10, 2026 · Tier A
  8. [8]Operationalize CMMC 2.0 Compliance with NucleusNucleus Security · undated page, accessed November 10, 2026 · Tier A
  9. [9]Get Started Nucleus POAMNucleus Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Nucleus PricingNucleus Security · undated page, accessed November 10, 2026 · Tier A
  11. [11]Risk-based Vulnerability Management | Nucleus SecurityNucleus Security · undated page, accessed November 10, 2026 · Tier A
  12. [12]Nucleus Reviews 2026: Details, Pricing, & FeaturesG2 · undated page, accessed November 10, 2026 · Tier C

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