Best Industrial Cybersecurity Platforms (OT/ICS Security) 2026

By the editors at Reliable. Last updated October 26, 2026.

Updated October 2026: ServiceNow bought Armis, Accenture took majority control of Dragos, and Mitsubishi Electric completed its Nozomi Networks purchase.

The short version: Industrial cybersecurity platforms (also called OT security, ICS security, or cyber-physical systems protection platforms) protect the industrial control systems that operate physical processes: SCADA, DCS, PLCs, and related equipment. The seven platforms covered here (Claroty, Dragos, Nozomi Networks, Armis, Microsoft Defender for IoT, Tenable One OT Exposure, and TXOne Networks) represent the current operational state of the category, and 2026 reshaped its ownership: Mitsubishi Electric completed its purchase of Nozomi Networks in January, ServiceNow completed its $7.75 billion purchase of Armis in April, and Accenture took a majority stake in Dragos (which then bought runZero and NetRise) by September. Claroty raised $150 million in January and says it may be ready for an IPO as early as 2027.

Three regulatory drivers create procurement urgency: NERC CIP for the electric sector (including CIP-015, the internal network security monitoring standard enforceable from October 1, 2028), the ISA/IEC 62443 international standards for industrial control system security, and TSA security directives for pipelines and rail, renewed again in May 2026.

The category divides into capability layers (visibility and detection, protection and enforcement, vulnerability management, asset intelligence), and most critical infrastructure operators deploy two or three platforms in place of a single vendor. OT security is a distinct discipline from IT security, with different priorities, constraints, and consequences.

How We Evaluated

This guide is independent editorial analysis based on publicly available product documentation, the Gartner Magic Quadrant and Critical Capabilities reports for CPS Protection Platforms, verified customer references across Gartner Peer Insights and other review platforms, and conversations with OT security practitioners, plant engineers, and critical infrastructure operators across electric utilities, oil and gas, water, manufacturing, and transportation. Reliable Magazine does not sell OT security software and has no commercial interest in routing buyers toward any particular platform. Reliable does not accept payment for rankings. Read our editorial policy.

Industrial cybersecurity is under-covered by independent editorial media. The category is well-served by analyst firms (Gartner, Forrester, Verdantix) and by vendor-published content, but independent comparison content written for the operations and reliability audience (plant engineers, facility managers, reliability professionals who increasingly sit adjacent to OT security decisions) is thin. What Reliable Magazine adds is the operations lens: how OT security platforms interact with the asset management, maintenance, and reliability systems already running in industrial facilities, and how the regulatory drivers map to operational reality.

Why OT Security Is a Distinct Discipline

The single most important concept for anyone evaluating industrial cybersecurity platforms: OT security is a different discipline from IT security extended into the plant. The two have different priorities, different constraints, and different consequences, and platforms built for one handle the other poorly.

Inverted priorities. IT security traditionally prioritizes the CIA triad in order: confidentiality, then integrity, then availability. OT security inverts this. Availability and safety come first because an OT system failure is a physical event before it is a data event. A compromised or crashed control system can cause equipment damage, environmental release, grid instability, or threats to human safety. The security tooling that protects OT must respect that an outage is itself a serious consequence.

Extended equipment lifecycles. OT environments run equipment with operational lifecycles measured in decades, compared with a few years for typical IT hardware. A control system installed in 2005 may still be running in 2030. This means OT environments contain large populations of legacy equipment that cannot be patched, cannot run modern endpoint agents, and were designed before cybersecurity was an operational consideration. TXOne, for one, states that its endpoint product covers Windows 2000 through Windows 11 and will support legacy systems through 2031.

Patching constraints. OT uptime requirements often preclude routine patching. A continuous process plant or a transmission operator cannot take systems offline on a monthly patch cycle. Patches are frequently deployed only during planned maintenance windows, which means OT systems run with known vulnerabilities for extended periods as a matter of operational necessity. Dragos's vulnerability management model, "Now, Next, Never," exists for this reason: its page says a small share of OT vulnerabilities (3 to 6 percent, by Dragos's count) warrant immediate action.

Proprietary protocols. OT systems communicate using industrial protocols (Modbus, DNP3, IEC 61850, Profinet, EtherNet/IP, OPC, and many others) that traditional IT security tools do not understand. Detecting a malicious command in industrial protocol traffic requires deep protocol inspection capability that general-purpose network security tools lack; TXOne's network product, for example, claims awareness of more than 180 OT protocols.

Fragile devices. Active scanning that is routine in IT security can crash fragile OT devices. A vulnerability scanner probing a PLC can cause the PLC to fault, which in a production environment is a process upset. This is why OT security platforms emphasize passive network monitoring and carefully controlled, OT-aware active discovery: Claroty calls its method Safe Queries, Tenable calls its Safe Active Query "do-no-harm," Nozomi calls its Smart Polling, and Armis sells Smart Active Querying.

The Purdue Model, the reference architecture that organized industrial networks into hierarchical levels with the control systems isolated at the bottom, was the traditional foundation of OT security. That foundation has eroded. Industrial environments are increasingly connected to enterprise networks, cloud services, and remote access paths, and the vendors in this guide now sell cloud consoles (Claroty xDome, Nozomi Vantage Cloud, Armis Centrix SaaS, Microsoft's Azure portal) as the default management plane. The result is that OT environments now need active security monitoring and defense in place of isolation, and that is the operational problem the platforms in this guide address.

The Regulatory Drivers Creating Urgency

Three regulatory frameworks create procurement urgency for OT security platforms in 2026.

NERC CIP for the electric sector. The North American Electric Reliability Corporation Critical Infrastructure Protection standards impose mandatory cybersecurity requirements on entities operating the Bulk Electric System. CIP-015-1 requires Internal Network Security Monitoring (INSM), meaning east-west traffic monitoring inside Electronic Security Perimeters, for high-impact BES Cyber Systems and medium-impact BES Cyber Systems with External Routable Connectivity. FERC approved CIP-015-1 in Order No. 907 on June 26, 2025, and the Texas Reliability Entity's standards calendar lists its enforcement date as October 1, 2028. FERC had also directed NERC to extend INSM to the access control and physical access systems that sit outside the perimeter; the resulting CIP-015-2 was approved by FERC letter order on August 10, 2026, takes effect October 1, 2029, and retires CIP-015-1 the day before. CIP-015 effectively requires the network monitoring capability that OT security platforms provide, which is why electric utilities are a major buyer segment. Our NERC CIP compliance guide covers the full standard set in detail.

ISA/IEC 62443 for industrial control systems generally. The IEC 62443 series (developed jointly with the International Society of Automation, hence ISA/IEC 62443) is the international standard for industrial automation and control systems security. Unlike NERC CIP, IEC 62443 is voluntary and applies across all industrial sectors. The standard introduces the zones and conduits model for network segmentation, security levels (SL 1 through SL 4) defining the strength of required protections, and maturity levels for security programs. IEC 62443 is increasingly referenced in procurement requirements, insurance underwriting, and regulations worldwide, and TXOne and Tenable name it on their product pages; the other vendors publish separate compliance material.

TSA security directives for pipelines and rail. Following the May 2021 Colonial Pipeline ransomware attack, the U.S. Transportation Security Administration issued mandatory cybersecurity directives for critical pipeline operators, later extended to freight rail, passenger rail, and rail transit. The directives are renewed annually: TSA's directive listing shows Security Directives Pipeline-2021-01E and Pipeline-2021-02F and the rail directive 1580/82-2022-01D dated May 3, 2025, and the signed Pipeline-2021-02G renewal is posted on tsa.gov for the May 2026 cycle. The pipeline series requires covered operators to establish and implement a TSA-approved Cybersecurity Implementation Plan, maintain and exercise a Cybersecurity Incident Response Plan, and run an annual Cybersecurity Assessment Plan with architecture reviews and penetration testing. TSA published a proposed rule on November 7, 2024 to codify cyber risk management program requirements for higher-risk pipeline and rail operators; as of mid-2026 it had not been finalized.

Beyond these three, additional drivers include the EU NIS2 Directive, sector-specific requirements in water and chemicals, cyber insurance underwriting requirements, and the general escalation of ransomware and nation-state threats against industrial targets. The regulatory environment is moving toward mandatory OT security across critical infrastructure sectors, and that trajectory is the structural reason the OT security market is drawing the acquirers it drew in 2026.

7 Best Industrial Cybersecurity Platforms for 2026, Ranked by Use Case

Capability statements in each entry are limited to what the vendor's own product pages and announcements named as of October 2026. Analyst rankings that the May version of this guide quoted have been removed, per house rules; ownership changes since May are recorded in each entry.

1. Claroty — Best for Breadth Across Cyber-Physical Systems

Claroty is the most broadly capable platform in the category by its own module list. The Claroty Platform spans Asset Inventory, Exposure Management, Network Protection, Secure Access, Threat Detection, and Operational Efficiency, and is deployable as Claroty xDome (cloud, in industrial, commercial, healthcare, and government variants), Claroty Continuous Threat Detection (CTD, on-premises), and xDome Secure Access, giving operations flexibility on deployment architecture. Claroty says 24 of the Fortune 100 and more than 1,300 customers run it across more than 22,000 sites in more than 60 countries.

Claroty's asset discovery uses several methods its pages name: passive monitoring, Safe Queries active discovery, project file analysis, and ecosystem enrichment, plus Claroty Edge. The platform's coverage extends across IT, OT, IoT, and IIoT devices, and Claroty has expanded beyond traditional industrial OT into healthcare (where its Medigate acquisition added medical device security) and commercial building systems, which is the basis of its cyber-physical systems positioning. Two 2026 additions are Claire, which Claroty calls the industry's first CPS-native AI security agent, and the CPS Library, an AI-powered asset catalog developed with Schneider Electric and Rockwell Automation.

Claroty's threat research team, Team82, provides the vulnerability research that informs the platform's detection capabilities and publishes a vulnerability disclosure dashboard. For NERC CIP, IEC 62443, and TSA directive compliance, Claroty provides the asset inventory, network monitoring, and INSM capability that the regulatory frameworks require.

Claroty is an independent private company founded in 2014 and headquartered in New York. Rockwell Automation, Schneider Electric's Aster Capital, and Siemens-backed Next47 joined its 2018 Series B, which gives Claroty unusually close relationships with the major industrial automation vendors without any of them owning it. On January 22, 2026 Claroty announced a $150 million Series F led by Golub Growth, with up to $50 million more from existing investors; the company said its valuation had grown 80 percent since its March 2024 round, and its CEO told Calcalist it may be ready for an IPO as early as 2027.

The trade-off is that Claroty's response model is visibility-and-detection-led. The platform produces rich telemetry and prioritized risk insight, but enforcement and containment generally depend on integration with external SIEM, SOAR, and network security systems. Operations needing active enforcement deploy Claroty alongside a protection-and-enforcement layer.

Best for: Critical infrastructure and large industrial operators needing the broadest capability across cyber-physical systems, deep asset discovery, and flexible cloud or on-premises deployment. Strong fit for operations with mixed industrial automation infrastructure given Claroty's vendor relationships.

Pricing: Quoted. Claroty publishes no pricing.

Deployment: Cloud (Claroty xDome) or on-premises (Claroty CTD).

Key differentiator: The widest cyber-physical systems scope of the seven (industrial, healthcare, commercial, government), with four named discovery methods and the only remaining independent ownership among the top four.

2. Dragos — Best for OT Threat Intelligence and Industrial Incident Response

Dragos occupies a distinct position in the category built on a threat-intelligence-first philosophy. The company was founded by former U.S. government industrial control system incident responders, and that heritage shapes the platform. Dragos now describes its scope as "xOT," the full operational technology environment, meaning every system that influences a physical process, and tracks 26 xOT-focused threat groups.

Dragos emphasizes contextualized alerts tied to known industrial adversary behavior, paired with practitioner-authored response playbooks, and its intelligence line (Dragos WorldView, threat reports, advisories, threat group profiles, and the annual Year in Review) feeds the Dragos Platform. The platform is organized into Visibility (Asset Visibility, Network Monitoring, and a new Software and Supply Chain Management module), Risk and Exposure (Vulnerability Management on the "Now, Next, Never" model, plus new Exposure Management and Device Remediation modules), Detection and Response (Threat Detection, Investigation and Response), and AI Acceleration (Dragos EmberAI). Neighborhood Keeper shares threat intelligence anonymously across participating operators.

Ownership changed in 2026. Accenture announced on June 18, 2026 that it would acquire a majority stake in Dragos and all of runZero (exposure assessment and attack-surface intelligence) and NetRise (software supply chain and firmware-level visibility) at a combined enterprise value of about $4.175 billion, with Dragos valued at $3.25 billion. The Accenture investment closed, and Dragos announced on September 21, 2026 that it had completed both acquisitions. Dragos says it continues to operate as an independent business under co-founder and CEO Robert M. Lee, with runZero's HD Moore and NetRise's Thomas Pace and Michael Scott joining as Dragos executives; the June release put headcount at 580 for Dragos, 66 for runZero, and 57 for NetRise.

Dragos's managed services (OT Watch managed threat hunting, urgent and standard incident response, OT cyber assessments, red team services, and tabletop exercises) matter for operations without large internal OT security teams, and Accenture's services business is now the parent. For NERC CIP, the platform provides asset inventory, INSM, and the threat detection capability the standards require. Named customers on Dragos's pages include Littleton Electric Light and Water Department, OUC, The Boston Beer Company, Trinity River Authority of Texas, and Koch Industries, and Dragos sends OT threat data into Microsoft Sentinel through an Azure Marketplace listing.

The trade-off, as with the other visibility-led platforms, is that Dragos is built to support skilled defenders and to integrate with enforcement systems for containment. Operations expecting automated containment should understand the model. The second trade-off is new: a buyer of Dragos is now a customer of an Accenture-controlled company, and the independence statement in the June release is worth writing into the contract.

Best for: Critical infrastructure operators building mature, threat-intelligence-driven security programs, particularly electric utilities, oil and gas, and public sector operations. Strong fit for operations that value industrial threat intelligence and managed incident response.

Pricing: Quoted. Dragos publishes no pricing.

Deployment: On-premises and cloud.

Key differentiator: The deepest industrial threat intelligence line of the seven (26 tracked threat groups, WorldView, annual Year in Review), now extended with exposure assessment and firmware supply chain visibility from runZero and NetRise.

3. Nozomi Networks — Best for Large-Scale OT and IoT Visibility

Nozomi Networks is built around its sensor line: Guardian Network for wired monitoring (passive monitoring plus Smart Polling, the company's active querying technology) and Guardian Air for wireless spectrum monitoring, which addresses a real blind spot in industrial environments where wireless instrumentation and devices proliferate. Vantage Cloud provides aggregation and analytics across distributed deployments, which matters for operations running OT monitoring across many sites, and Arc Endpoint and Arc Embedded Endpoint extend visibility to hosts and embedded devices; Nozomi says the latest Arc release is the first OT cybersecurity solution to safely automate threat response in operational environments. Asset Intelligence and Threat Intelligence subscriptions enhance device classification and vulnerability data.

Ownership changed in January 2026. Mitsubishi Electric announced its acquisition of Nozomi Networks on September 9, 2025 and completed it on January 28, 2026; Nozomi now operates as a wholly owned subsidiary that keeps its brand, leadership (CEO Edgard Capdevielle; co-founder and chief product officer Andrea Carcano), teams, offices, and vendor-agnostic approach. At the close Nozomi said its annual revenue had passed $100 million, that headcount grew 24 percent in 2025, and that customers include five of the top ten oil and gas companies, seven of the top ten pharmaceutical manufacturers, seven of the top ten utilities, and four of the top ten mining operations (vendor figures).

The platform's strength is scale. Nozomi is frequently selected by large, distributed industrial operations (multi-site utilities, large manufacturers, distributed energy and transportation operators) where the requirement is consistent OT and IoT visibility across many facilities aggregated into a unified view. For regulatory compliance, Nozomi provides INSM capability, IEC 62443 alignment, and the asset inventory and monitoring that TSA directives require, and integrates with SIEM and SOC workflows for response.

The trade-off is that Nozomi, like Claroty and Dragos, is a visibility-and-detection platform first; Arc's automated response is the exception its own release highlights. The competitive distinction among the three visibility leaders is real but situational (Claroty for breadth across cyber-physical systems, Dragos for threat intelligence depth, Nozomi for large-scale distributed visibility), and many operations evaluate all three before selecting. A buyer should also ask what Mitsubishi Electric ownership means for roadmap priorities, since the parent is itself an automation vendor; Nozomi's answer at the close was that nothing changes.

Best for: Large, distributed industrial operations needing consistent OT and IoT visibility across many sites with AI-driven anomaly detection. Strong fit for multi-site utilities, large manufacturers, and distributed energy and transportation operators.

Pricing: Quoted. Nozomi publishes no pricing.

Deployment: On-premises sensors (Guardian Network, Guardian Air) with cloud aggregation (Vantage Cloud); Arc endpoint agents.

Key differentiator: Wireless spectrum monitoring and the largest named sensor and endpoint line of the seven, now inside Mitsubishi Electric with the brand and leadership kept.

4. Armis (ServiceNow) — Best for Agentless Asset Intelligence Across Converged IT, OT, and IoT

Armis approaches industrial cybersecurity from an asset intelligence foundation. Armis Centrix is a cyber exposure management platform for environments where IT, OT, and IoT have converged, with named modules for Asset Management and Security (CAASM), OT/IoT Security (SaaS and on-premises), Medical Device Security, Vulnerability Prioritization and Remediation, Vulnerability Management Detection and Response, Application Security, and Early Warning, plus an Asset Intelligence Engine, a Vulnerability Intelligence Database, Smart Active Querying, and Secure Remote Access. The agentless approach is the defining characteristic: Armis builds asset intelligence by aggregating and correlating data from many sources, which lets it see and classify a very broad range of device types, and it says its engine tracks nearly 7 billion devices.

Ownership changed in April 2026. ServiceNow completed its acquisition of Armis on April 20, 2026 for about $7.75 billion in cash, and Armis Centrix is being integrated into the ServiceNow AI Platform while remaining available as a standalone product; Armis's asset intelligence also feeds ServiceNow's AI Control Tower. The purchase followed a $435 million pre-IPO round in November 2025 at a $6.1 billion valuation and Armis's March 2025 acquisition of OTORIO, an Israel-based OT and cyber-physical security vendor that deepened the OT line.

This breadth is the platform's distinguishing strength, and the ServiceNow deal sharpens it: operations that run IT service management, CMDB, and now exposure management in ServiceNow get one asset record across corporate IT, OT control systems, IoT devices, and building systems. For organizations whose security operations span IT and OT under a unified team, Armis fits the operating structure well.

The trade-off is depth versus breadth, and now platform gravity. Operations whose dominant concern is deep OT-specific threat detection, industrial protocol inspection, or industrial threat intelligence sometimes find the OT-first platforms (Claroty, Dragos, Nozomi) deeper in the specifically industrial dimensions, and operations not standardized on ServiceNow should ask how long the standalone offer stays a priority.

Best for: Organizations with converged IT, OT, and IoT environments needing unified asset intelligence and exposure management across the full device estate, particularly where security operations span IT and OT under a unified team or where ServiceNow is already the system of record.

Pricing: Quoted. Armis publishes no pricing; ServiceNow now sells it.

Deployment: Cloud (SaaS) with on-premises options for OT/IoT Security; agentless architecture.

Key differentiator: Agentless asset intelligence with the broadest converged IT, OT, and IoT device visibility of the seven, now inside ServiceNow's platform.

5. Microsoft Defender for IoT — Best for Microsoft-Standardized Security Operations

Microsoft Defender for IoT's distinguishing characteristic is integration with the broader Microsoft security ecosystem. For organizations that have standardized their security operations on Microsoft (Microsoft Sentinel as the SIEM, the Defender suite for endpoint and identity, Microsoft Entra for identity management), Defender for IoT extends that unified security operations model into OT and IoT environments.

Microsoft describes the product as asset discovery, vulnerability management, and threat protection for IoT and industrial infrastructure, using passive and active agentless network monitoring to build an inventory with protocol, communication, and backplane context, risk-prioritized posture guidance, and behavioral analytics with a unified view of attacks that start on IT networks and move into OT. The product originated from Microsoft's 2020 acquisition of CyberX. Microsoft positions it alongside Defender XDR, and its documentation points customers who want a unified IT and OT experience to Defender for IoT in the Microsoft Defender portal (in preview as of this update). The on-premises management console was retired on January 1, 2025, and the OT sensor line has shipped versions 25.1 through 26.1.1 since, with 26.1.0 (April 2026) moving the sensor operating system to Debian 12.

Licensing is the one place Microsoft publishes structure: OT protection is licensed per site, with pricing that varies by site size, while enterprise IoT devices are covered by Microsoft 365 E5 and the Microsoft Defender Suite (up to five devices per user license) or a per-device add-on to Defender for Endpoint P2. NERC CIP, IEC 62443, and NIS2 are not named on the product page.

The trade-off is that Defender for IoT is most compelling specifically within the Microsoft ecosystem. Organizations not standardized on Sentinel and Defender capture less of the integration value and may find the OT-first platforms deeper on OT-specific capability. The platform's strength is ecosystem fit, and the evaluation should weight whether the operation is Microsoft-standardized.

Best for: Organizations standardized on the Microsoft security ecosystem (Sentinel, Defender, Entra) seeking to extend unified security operations into OT and IoT without deploying a separate OT security stack.

Pricing: Site-based licensing for OT (pricing varies by site size); enterprise IoT included in Microsoft 365 E5 and Defender Suite or sold as a per-device add-on.

Deployment: On-site OT sensors with cloud management in the Azure portal, and the Microsoft Defender portal in preview.

Key differentiator: Native integration with the Microsoft security ecosystem, and the only vendor here that publishes its licensing model.

6. Tenable One OT Exposure (formerly Tenable OT Security) — Best for OT Vulnerability Management and Exposure-Driven Programs

Tenable brings its vulnerability management heritage into the OT environment. Tenable built its business on IT vulnerability management (Nessus is one of the most widely deployed vulnerability scanners in the industry), and its OT product, now presented as Tenable One OT Exposure, applies an exposure-management lens to industrial environments. Its distinguishing strength is OT vulnerability identification and risk-based prioritization using Tenable's Vulnerability Priority Rating, which the company contrasts with CVSS severity.

The product page names OT, IoT, and IT asset discovery (continuous traffic monitoring, Safe Active Queries that Tenable describes as patented, vendor-approved, and "do-no-harm," and imports of SCD, ACD, CSV, and PLC project files), real-time configuration tracking with AI-generated explanations, threat detection through configuration change and anomaly detection, network mapping and segmentation support, AI-powered remediation guidance, attack path analysis, and executive reporting. It integrates with SIEM and SOAR platforms and firewalls, can open Jira or ServiceNow tickets and update firewall rules, and reports through Tenable Security Center. Deployment is cloud, on-premises (suited to air-gapped networks), or hybrid, and the compliance frameworks named on the page are NERC CIP, IEC 62443, NIST, ISO 27001, and PCI DSS.

For operations whose security program is organized around exposure management and vulnerability prioritization, the Tenable One integration is the core value: one view of exposure across IT, cloud, identity, and OT. For NERC CIP, the fit is CIP-010 vulnerability assessments and the CIP-015 monitoring requirement.

The trade-off is scope. Tenable's OT product is strongest in vulnerability and exposure management, and operations needing broad cyber-physical protection beyond that typically evaluate the visibility-first platforms alongside it. The product's name has also moved: Tenable's own page now leads with "Tenable One OT Exposure," while its February 2024 release introduced "Tenable One for OT/IoT" with a companion Tenable OT Security license, so buyers will see all three names in proposals.

Best for: Operations whose OT security program is organized around vulnerability management and exposure-driven prioritization, particularly organizations already using Tenable for IT vulnerability management and Tenable One for unified exposure management.

Pricing: Quoted. Tenable publishes no OT pricing.

Deployment: Cloud, on-premises (including air-gapped), or hybrid, integrated with Tenable One.

Key differentiator: The most specific published discovery and integration list of the seven for vulnerability work (Safe Active Queries, project file import, ticketing and firewall actions), inside a unified IT and OT exposure platform.

7. TXOne Networks — Best for OT-Native Endpoint Protection and Network Segmentation

TXOne Networks occupies the protection-and-enforcement side of the OT security category, which makes it a useful counterpoint to the visibility-led platforms above. TXOne calls itself "operations-first" and "prevention-first," and its unified architecture, TXOne Complete, combines four product lines: TXOne Edge for network security (awareness of more than 180 OT protocols and more than 1,500 threat signatures), TXOne Stellar for endpoint protection (Windows 2000 through Windows 11, with legacy systems supported through 2031), TXOne Element for inspecting devices and media before they enter an environment (no software installation, air-gap support), and TXOne Sennin for enterprise orchestration (centralized asset visibility across sites, 100,000-plus assets managed). TXOne was created in 2018 as a joint venture of Trend Micro and Moxa, raised a $70 million Series B led by TGVest Capital, and runs dual headquarters in Texas and Taiwan.

TXOne's endpoint protection is purpose-built for OT constraints. Stellar's stated coverage from Windows 2000 forward matters because the legacy equipment population in OT environments is a security gap that visibility platforms can identify but not directly protect. TXOne's network segmentation and inspection capabilities support the zones and conduits model central to IEC 62443, and its site names ISA/IEC 62443, NIS2, NERC CIP, and TSA security requirements as frameworks it addresses. The company claims more than 3,600 deployments with zero unplanned downtime (a vendor claim) and names Ansaldo Energia and Carlsberg Group as customers.

For operations building a defense-in-depth OT security architecture, TXOne fills the enforcement layer that the visibility-led platforms depend on external systems to provide. The platform is commonly deployed alongside a visibility and detection platform: TXOne handles protection and segmentation while the visibility platform handles asset discovery and threat detection.

The trade-off is scope. TXOne is focused on the protection and enforcement layer; for the endpoint protection and segmentation use case it is purpose-built, and for asset inventory and threat intelligence at the scale of the visibility leaders it is the complement, not the substitute.

Best for: Operations building defense-in-depth OT security architectures that need an enforcement and protection layer (OT endpoint security, including for legacy equipment, and network segmentation) alongside a visibility and detection platform.

Pricing: Quoted. TXOne publishes no pricing.

Deployment: On-premises, purpose-built for OT environments, with air-gap support in the Element line.

Key differentiator: OT-native endpoint protection with stated support for Windows 2000-era systems through 2031, plus network segmentation and portable inspection, filling the enforcement layer in defense-in-depth architectures.

Side-by-Side Comparison

How to Choose

The right platform depends on the dominant operational concern and the capability layer the operation most needs to fill.

• If breadth across cyber-physical systems is the priority, Claroty offers the widest named scope (industrial, healthcare, commercial, government) and remains independently owned. Strong default starting point for large critical infrastructure operators.

• If industrial threat intelligence and incident response depth is the priority, Dragos is purpose-built for threat-intelligence-driven security programs, now with runZero and NetRise exposure and firmware visibility inside the platform. Strong fit for electric utilities, oil and gas, and public sector.

• If large-scale distributed visibility is the priority, Nozomi Networks is built for consistent OT and IoT monitoring across many sites with wired, wireless, and endpoint sensors.

• If converged IT, OT, and IoT asset intelligence is the priority, Armis provides the broadest agentless visibility across the full device estate, and the ServiceNow purchase makes it the natural choice for ServiceNow shops.

• If the security operations center runs on Microsoft, Microsoft Defender for IoT extends unified security operations into OT without a separate stack, with site-based OT licensing.

• If OT vulnerability management is the priority, Tenable One OT Exposure is purpose-built for exposure-driven programs, particularly alongside existing Tenable deployments.

• If the operation needs an enforcement and protection layer, TXOne Networks provides OT-native endpoint protection and segmentation alongside a visibility platform.

For operations subject to NERC CIP, the CIP-015 INSM requirement should be a specific evaluation criterion: validate that the platform provides east-west traffic monitoring inside the Electronic Security Perimeter and publishes NERC CIP capability mapping, and plan for the October 1, 2028 enforcement date and the October 1, 2029 CIP-015-2 extension. For operations subject to TSA security directives, validate asset inventory, network segmentation validation, and incident detection against the current directive series. For operations building toward IEC 62443, validate zones-and-conduits and security-level alignment.

A 2026 addition to the checklist: ask every finalist who owns it and what the owner has promised. Four of the seven platforms changed hands or took strategic capital this year, and the independence statements (Nozomi under Mitsubishi Electric, Dragos under Accenture, Armis Centrix standalone under ServiceNow) belong in the contract as assignment, support, and data-export clauses.

The Honest Middle Ground

OT security platform selection is a category where vendor positioning and analyst rankings can obscure the operational reality. A few honest assessments worth flagging.

Most operations need more than one platform. The OT security category divides into capability layers (visibility and detection, protection and enforcement, vulnerability management, asset intelligence), and no single platform dominates every layer. A mature OT security architecture typically combines a visibility and detection platform (Claroty, Dragos, or Nozomi) with a protection and enforcement layer (TXOne or network-security tooling), integrated through the security operations center. Operations evaluating platforms should plan for a layered architecture and budget accordingly.

The visibility leaders are close, and all three are now differently owned. Claroty, Dragos, and Nozomi are all strong platforms. The differences among them (Claroty's CPS breadth, Dragos's threat intelligence, Nozomi's distributed scale) are real but situational, and the ownership differences are now as large as the product differences: Claroty is independent and IPO-bound, Dragos is majority-owned by a services company, and Nozomi is a subsidiary of an automation vendor. Operations should run all three through a proof-of-concept in their actual environment. The platform that performs best on a specific operation's actual asset mix, network architecture, and use cases is the one to pick, whatever an analyst chart says.

The network-security vendors are a legitimate alternative approach. Cisco, Palo Alto Networks, and Fortinet approach OT security from the network infrastructure side, using firewalls, switches, and routers as both sensors and enforcement points. This network-led approach has an advantage the OT-first platforms lack: direct control over network enforcement without depending on third-party infrastructure for containment. Operations whose network infrastructure is standardized on one of these vendors should evaluate the vendor's OT security capability as a serious alternative, weighing enforcement integration against the OT-specific depth of the specialist platforms. This guide focuses on the OT-specialist platforms because they are the under-covered category, but the network-led approach is a legitimate path.

Deployment impact on production is the most underestimated factor. Vendor demonstrations show platforms in clean environments. The operational reality is that deploying OT security monitoring requires network changes (SPAN ports, network taps, sometimes switch replacements) and careful tuning to avoid false positives and any impact on fragile OT devices. Operations consistently underestimate the deployment effort. The platform that is easiest to deploy in a specific environment may matter more than marginal capability differences, and deployment impact should be a proof-of-concept evaluation criterion.

The platform does not replace the program. An OT security platform provides visibility, detection, and in some cases protection. It does not provide the security program: the governance, the trained staff, the incident response capability, the network segmentation architecture, the patch and configuration management discipline. Operations that buy a platform expecting it to deliver OT security as a product are consistently disappointed. The platform is a tool within a program, and operations without the program to use it effectively capture a fraction of the value. For operations without internal OT security staff, managed services (Dragos OT Watch and incident response, and now Accenture's services behind them, among others) are often a more realistic path than a platform alone.

OT security and asset management overlap more than either side recognizes. OT security platforms build detailed asset inventories. So do CMMS and EAM systems. The two inventories are rarely aligned, and the operational opportunity, a single accurate asset record serving both maintenance and security, is largely unrealized. The ServiceNow purchase of Armis is the clearest market signal that the asset record is the prize. Operations deploying OT security should consider how the platform's asset discovery aligns with the existing CMMS or EAM asset master, both to avoid maintaining two divergent inventories and because security context (which assets are vulnerable, which are critical) is useful for maintenance prioritization..

Related Guides

• NERC CIP Compliance Guide for Electric Utilities

• Best CMMS for Utilities 2026: Independent Comparison

• Best CMMS for Power Generation 2026

• Best Industrial IoT Platforms 2026

• Best EAM Software for Utilities 2026

Sources

• NERC and Texas RE: 2025 FERC Orders and Rules (Order No. 907, June 26, 2025); Texas RE Standards Dates (August 27, 2026; CIP-015-1 and CIP-015-2 dates)

• TSA: Security Directives and Emergency Amendments; Enhancing Surface Cyber Risk Management, proposed rule (Federal Register, November 7, 2024)

• Claroty: Claroty Platform; Claroty Secures $150 Million in Series F Funding (January 22, 2026)

• Dragos: Dragos Platform; Dragos, runZero, and NetRise to join forces with Accenture (June 18, 2026); SecurityWeek, Dragos Completes NetRise and runZero Acquisitions Following Accenture Deal (September 2026)

• Nozomi Networks: Nozomi Networks Enters Next Phase of Growth as Mitsubishi Electric Completes Acquisition (January 28, 2026)

• Armis: Armis Centrix; Welcoming the Next Chapter: ServiceNow Completes Armis Acquisition (April 20, 2026); IT Brief, ServiceNow completes USD $7.75 billion Armis acquisition (April 22, 2026)

• Microsoft: Microsoft Defender for IoT; What's new in Microsoft Defender for IoT

• Tenable: Tenable One OT Exposure

• TXOne Networks: TXOne Networks

Last updated: October 26, 2026. This guide is editorial analysis by Reliable Magazine. No vendor paid for ranking consideration or editorial input.