10 Leading OT Security Vendors to Watch

Selecting the right OT security vendor is one of the highest-stakes procurement decisions a plant CISO or OT program manager makes. This guide profiles 10 leading OT security vendors, covering product focus, strengths, deployment models, buyer caveats, and suggested RFP questions, giving procurement teams a practical shortlist framework and the right questions to ask before a POC.

Why Vendor Selection Has Never Been More Consequential

The OT security market has matured considerably since the first generation of passive monitoring tools appeared in the mid-2010s. By 2026, buyers are no longer choosing between “doing OT security” and not , they are choosing which vendor architecture best fits their environment, risk profile, and operational constraints.

Several forces are converging to raise the stakes of that decision.

Threat intensity is increasing. Nation-state actors and ransomware groups have demonstrated sustained capability and intent to target industrial infrastructure. CISA advisories for ICS-specific vulnerabilities have grown consistently year over year (check source, verify current CISA ICS advisory volume). The Dragos Year in Review and Claroty’s State of OT Security reports (check source for current editions) consistently document new threat groups with OT-specific tooling.

Regulatory pressure is real and expanding. NIS2 in Europe, updated NERC CIP standards in North America, and emerging sector-specific guidance in Asia-Pacific are creating audit obligations that require documented, vendor-supported security controls, not just internal policies.

IT/OT convergence is accelerating the attack surface. Cloud-connected historians, remote access proliferation, and digital twin deployments have created network adjacencies that legacy perimeter models do not address. Vendors who understand both the IT integration layer and the OT process layer are increasingly differentiated from those who cover only one.

Buyer priorities have shifted. The 2026 buyer is not just asking “what can this tool see?” They are asking “what does it do to our safety systems, what can it detect that we cannot detect ourselves, and can the vendor support our 15-year device lifecycle?”

Selection Criteria

The ten vendors profiled below were selected based on: OT-native telemetry and passive deployment options, breadth of industrial protocol support (Modbus, DNP3, IEC 61850, EtherNet/IP, PROFINET, and others), integration with IT SIEM and ticketing systems, verifiable customer deployments in at-risk verticals, active R&D roadmap and threat research investment, compliance alignment with IEC 62443 and NIST SP 800-82, and availability of managed service options for teams with limited in-house OT security capacity.

This selection is based on market research, public analyst citations, vendor documentation, and publicly reported customer deployments. All specific capability claims are marked (check source) where confirmation against current vendor documentation is recommended.

1. Dragos

Snapshot: OT-native threat detection, threat intelligence, and incident response platform purpose-built for industrial environments.

Product suite: Dragos Platform (asset visibility, network monitoring, threat detection), WorldView threat intelligence, managed services (Dragos OT-Watch), and incident response retainer.

Best-fit use cases: Electric utilities, oil and gas, manufacturing, water/wastewater. Particularly strong in brownfield environments with complex legacy protocol mixes.

Strengths:

• Deepest OT threat intelligence team in the market, tracks named OT-specific threat groups (check source, verify current group count via Dragos annual report)
• Playbook-driven detection with OT-specific investigation workflows
• Strong incident response bench with OT forensics capability

Buyer caveats:

• Premium pricing positions it toward enterprise and critical infrastructure, may be cost-prohibitive for mid-market
• Managed service model requires operational trust; review SLA terms carefully

Buying signal: Request a live demonstration of detection against your specific protocol mix; ask how many of their named threat groups have targeted your sector in the past 24 months.

Proof points: Publicly cited deployments in North American electric utilities and global energy companies (check source).

Deployment: On-premises sensor with cloud portal option; managed OT-Watch service available.

RFP question: “How does your platform handle detection in an environment with both Modbus RTU serial and EtherNet/IP , what is the specific coverage difference?”

2 , Claroty

Snapshot: Extended Industrial IoT (XIoT) security platform covering OT, IoT, and BMS (Building Management Systems) asset visibility and risk management.

Product suite: Continuous Threat Detection (CTD), Secure Remote Access (SRA), asset inventory, risk scoring, and integration ecosystem.

Best-fit use cases: Manufacturing, pharmaceuticals, healthcare OT environments, and facilities with converged OT/IoT/BMS infrastructure. Strong in regulated industries requiring compliance reporting.

Strengths:

• Broad protocol coverage across OT, IoT, and IT, suited to converged environments
• Strong SIEM and IT security ecosystem integrations (Splunk, Microsoft Sentinel, ServiceNow) (check source for current integration list)
• Risk quantification framework aligned to compliance requirements

Buyer caveats:

• Breadth of coverage can mean shallower OT-specific detection compared to OT-only platforms in some environments
• Review data handling practices for any cloud-connected telemetry

Buying signal: Test the integration path with your existing SIEM and ticketing system before committing, Clarity’s ecosystem integrations are a primary value driver.

Deployment: On-premises, cloud-connected, and hybrid; managed service options available (check source for current MSP partner program).

RFP question: “Show us your risk scoring methodology and how it maps to IEC 62443 zone and conduit requirements.”

3. Nozomi Networks

Snapshot: AI-driven OT and IoT asset visibility, anomaly detection, and threat monitoring.

Product suite: Guardian (network sensor), Vantage (cloud management platform), Arc (endpoint agent for supported devices), and Remote Support option.

Best-fit use cases: Energy, utilities, manufacturing, transportation. Strong for organizations requiring multi-site visibility from a centralized cloud dashboard.

Strengths:

• AI/ML-based anomaly detection with strong behavioral baseline capability
• Vantage cloud platform enables centralized multi-site management
• Arc agent provides deeper endpoint telemetry where supported devices allow it

Buyer caveats:

• AI/ML detection requires a meaningful baselining period before producing high-fidelity alerts, plan for a 4–8 week baseline window in POC scoping
• Arc agent deployment requires vendor and safety team sign-off per device

Buying signal: Ask for a false-positive rate metric from comparable customer environments during the POC, baselining quality is the primary differentiator.

Deployment: On-premises sensor, cloud-managed via Vantage, hybrid; MSP program available (check source).

RFP question: “What is your typical false-positive rate during the first 30 days post-deployment, and what baseline tuning support is included?”

4. Fortinet (FortiGate OT / FortiNAC / OT Security Platform)

Snapshot: Integrated IT/OT security platform leveraging Fortinet’s enterprise security architecture extended to industrial environments.

Product suite: FortiGate ruggedized firewalls, FortiNAC for OT network access control, FortiSIEM, and OT-specific threat intelligence feeds.

Best-fit use cases: Organizations with existing Fortinet IT security investment seeking to extend to OT with a unified vendor. Manufacturing, utilities, and critical infrastructure with IT/OT convergence requirements.

Strengths:

• Native IT/OT integration for organizations already running FortiGate infrastructure
• Ruggedized hardware options suitable for harsh industrial environments
• OT protocol inspection at the firewall layer, not just passive monitoring

Buyer caveats:

• OT-specific threat intelligence depth is not as extensive as OT-native platforms
• Best value realized by organizations with existing Fortinet stack, standalone OT value is narrower

Deployment: On-premises hardware (including ruggedized), cloud management via FortiCloud (check source for current platform options).

RFP question: “How do your OT-specific threat detection rules differ from generic IT rules, and who maintains the OT rule set?”

5. Tenable OT Security (formerly Tenable.ot / Industrial Security)

Snapshot: Asset discovery, vulnerability management, and risk prioritization for OT environments, drawing on Tenable’s enterprise vulnerability management heritage.

Product suite: OT asset discovery (active + passive), vulnerability assessment, risk scoring, and integration with Tenable.sc and Tenable One.

Best-fit use cases: Organizations prioritizing vulnerability management and compliance reporting over behavioral threat detection. Manufacturing, oil and gas, regulated critical infrastructure.

Strengths:

• Deep vulnerability database extending IT CVE coverage into OT firmware and device-specific vulnerabilities
• Strong integration with Tenable’s broader vulnerability management platform for unified IT/OT risk view
• Active querying option provides deeper asset detail (with appropriate safety caveats)

Buyer caveats:

• Active query features require careful configuration in safety-critical environments, passive-only mode reduces asset detail depth
• Threat detection capability is narrower than OT-native monitoring platforms

Deployment: On-premises and cloud-connected; part of Tenable One unified exposure management platform (check source for current packaging).

RFP question: “What is the difference in asset detail between your active and passive discovery modes, and what safety checks are required before enabling active queries?”

6. Honeywell Forge Cybersecurity Suite

Snapshot: OT security platform from a major industrial automation OEM, integrating cybersecurity into operational technology lifecycle management.

Product suite: Asset discovery, network monitoring, endpoint security for OT, secure remote access, and managed security services via Honeywell’s OT cybersecurity team.

Best-fit use cases: Process industries, oil and gas, chemicals, refining, and Honeywell automation environments. Particularly suited to customers with Honeywell DCS/PLC installed base.

Strengths:

• OEM depth in Honeywell-native environments, device-level integration not available from third-party-only vendors
• Managed security services with process industry-experienced analysts
• Safety and cybersecurity integration designed to meet functional safety standards

Buyer caveats:

• Primary value in Honeywell automation environments; multi-vendor environments may experience reduced integration depth
• Managed service model requires review of data handling and incident response SLAs

Deployment: On-premises and managed service; cloud connectivity options available (check source for current platform architecture).

RFP question: “How does your platform handle mixed-vendor environments where Honeywell DCS coexists with third-party PLCs and RTUs?”

7. Cisco Cyber Vision

Snapshot: OT asset visibility and threat detection embedded in Cisco network infrastructure, enabling security without dedicated OT sensors on every segment.

Product suite: Cyber Vision (embedded in Cisco IE switches, ISR routers, IC3000), integration with Cisco SecureX/Cisco XDR, and connection to Cisco’s broader security architecture.

Best-fit use cases: Organizations with significant existing Cisco networking investment in OT environments. Manufacturing, utilities, and transportation with Cisco-based OT network infrastructure.

Strengths:

• Sensor embedded in existing Cisco network hardware, reduces deployment cost and complexity in Cisco environments
• Native integration with Cisco’s IT security ecosystem (SecureX, Stealthwatch) for IT/OT correlation
• Scalable architecture suitable for large, distributed OT networks

Buyer caveats:

• Value is strongly correlated to Cisco network infrastructure presence, limited benefit in non-Cisco environments
• OT threat intelligence depth is narrower than dedicated OT security platforms

Deployment: Embedded in Cisco network hardware; cloud and on-premises management (check source for current Cisco XDR integration status).

RFP question: “What is the Cyber Vision coverage gap in a segment running non-Cisco switches, how do you handle those segments?”

8. Armis (OT/ICS Security Module)

Snapshot: Agentless device security platform extending from enterprise IoT into OT environments, asset discovery, vulnerability management, and threat detection without active scanning.

Product suite: Armis Centrix platform, OT/ICS module, asset intelligence, network monitoring, and integration with IT security tools.

Best-fit use cases: Converged IT/OT/IoT environments where unified asset visibility across all three domains is a priority. Healthcare OT, manufacturing, building infrastructure.

Strengths:

• Single platform spanning IoT, OT, and IT, reduces vendor proliferation for converged environments
• Extensive device classification database for automated asset identification
• Strong cloud-native architecture for centralized multi-site management

Buyer caveats:

• OT protocol depth and OT-specific threat detection are less mature than dedicated OT platforms
• Cloud-native architecture requires careful review of data egress and residency for air-gapped or sensitive environments

Deployment: Cloud-native SaaS with on-premises collector options (check source for current air-gap support options).

RFP question: “How does your OT-specific detection differ from your IoT detection, show us a side-by-side protocol coverage comparison.”

9. Kaspersky Industrial CyberSecurity (KICS)

Snapshot: OT-native security platform from Kaspersky covering network monitoring, endpoint protection for industrial workstations, and industrial threat intelligence.

Product suite: KICS for Networks (passive OT monitoring), KICS for Nodes (endpoint protection for OT workstations and servers), and Kaspersky ICS CERT threat intelligence.

Best-fit use cases: Manufacturing, energy, and industrial environments where endpoint protection for OT workstations is a priority alongside network monitoring. Particularly noted in European and Asian industrial markets.

Strengths:

• Combined network + endpoint coverage in a single OT-native platform
• Kaspersky ICS CERT is a respected OT threat research team with public vulnerability disclosures (check source)
• Established presence in industrial verticals across multiple geographies

Buyer caveats:

• Geopolitical considerations have led some organizations, particularly in North America and Western Europe, to pause or review Kaspersky deployments; buyers should evaluate against their own risk and regulatory context (check source, verify current governmental guidance in your jurisdiction)
• Procurement teams should review their organization’s third-party risk policy before evaluation

Deployment: On-premises; check source for current cloud and managed service options.

RFP question: “What data, if any, leaves the plant network, and where is it processed and stored?”

10. Otorio

Snapshot: OT risk management and security operations platform focused on risk quantification, attack path analysis, and continuous compliance for industrial environments.

Product suite: RAM² platform, OT asset inventory, risk scoring, attack path visualization, compliance gap analysis, and remediation prioritization.

Best-fit use cases: Organizations that need structured OT risk quantification and board-ready reporting alongside detection. Manufacturing, energy, and critical infrastructure teams building formal OT security programs.

Strengths:

• Attack path analysis capability maps potential adversary routes through OT network, differentiator for risk-prioritization use cases
• Compliance mapping to IEC 62443 and sector-specific standards
• Strong mid-market positioning relative to larger platform vendors

Buyer caveats:

• Newer market entrant relative to Dragos/Claroty/Nozomi, fewer large-scale deployment proof points in the public domain (check source)
• Detection breadth may require supplementation with dedicated OT IDS for high-complexity protocol environments

Deployment: SaaS and on-premises options (check source for current deployment architecture).

RFP question: “Walk us through a live attack path analysis on our network topology , how does your platform prioritize remediation steps?”

How to Run a Defensible OT Vendor Evaluation

A structured evaluation process protects both the procurement outcome and the operational environment.

Phase 1, Scope definition (weeks 1–2): Define the pilot scope in writing: specific network segments, device types, protocol mix, and integration requirements. Obtain safety team sign-off on what a vendor sensor can do, and cannot do, on the target segment.

Phase 2, Proof of Concept (weeks 3–8): Run a minimum 6-week passive monitoring POC. Success criteria should be agreed in writing before day one: asset discovery completeness, protocol parsing accuracy, false-positive rate, and SIEM integration latency.

Phase 3, Integration validation: Test your SIEM, ticketing (ServiceNow, Jira), and asset inventory integration before the POC closes. Integration failures discovered post-purchase are costly.

Phase 4, Governance and SLA review: Review data handling agreements, incident notification SLAs, and what happens to your OT data if you terminate the contract. Insist on contractual clarity on non-disruptive mode guarantees.

Red flags: Any vendor who cannot demonstrate passive-only deployment, refuses to provide a reference customer in your vertical, or cannot quantify their protocol coverage on your specific device types.

Implementation Traps and Vendor Governance

The most common procurement mistakes in OT security vendor selection are not technical, they are procedural.

Testing only in lab environments: A lab POC using replicated traffic does not reflect production network behavior. Insist on a production segment pilot (in passive mode) for at least part of the evaluation.

Ignoring change control: Deploying a new sensor to an OT network segment is a change that requires engineering and safety sign-off. Vendors who minimize this requirement are understating operational risk.

Not validating non-disruptive claims: “Passive monitoring” is not a uniform specification. Ask specifically: does the sensor generate any traffic? Does it respond to broadcast traffic? Does it perform any active queries? Get the answers in writing.

Skipping vendor maintenance SLA review: What happens when the vendor’s sensor software needs updating? Who schedules the maintenance window? What is the rollback procedure if an update causes a fault?

Over-relying on analyst rankings: Analyst quadrant positions reflect marketing investment and analyst relationship management as well as product quality. Weight POC results and reference customer conversations above analyst positioning.

Conclusion

The leading OT security vendors profiled here represent the strongest current options across detection, visibility, risk management, and IT/OT integration, but no single vendor is the right choice for every environment. Match vendor strengths to your specific protocol mix, your team’s operational capacity, your integration requirements, and your regulatory obligations.