Once limited to niche use cases, operational technology security has become a critical boardroom issue spanning the industrial realm. The merging of IT and OT networks, the rise of internet-connected industrial devices, and the increasingly advanced nature of state-sponsored threat actors targeting critical infrastructure have collectively made OT cybersecurity among the most consequential and technically challenging fields in enterprise security today. To choose the right vendor in this area, it helps to understand how these platforms tackle the core issues of OT environments: support for legacy devices, protocol diversity, passive monitoring needs and the operational sensitivity that dictates how far security controls can be deployed.
For evaluating any vendor here, understanding what OT security is and how industrial cybersecurity built for industrial environments differs from the generic-purpose IT-focused solutions repurposed to work in a plant environment is a foundational context. This foundational framing has been established in a new resource on OT security meaning in industrial cybersecurity, outlining the basic principles of securing operational technology environments, which has its distinct criteria and characteristics that OT security specifically addresses with respect to Industrial Control Systems.
The five vendors we highlight here are established leaders in the OT and ICS cybersecurity industries by 2026 and are known for their specific technical strengths in their respective segments of the industrial security market.
Fortinet
Fortinet is the only vendor with a comprehensive OT security portfolio that addresses the entire range of industrial cybersecurity needs from network segmentation and access control to threat detection and incident response across converged IT/OT environments. At the heart of the platform is Fortinet Security Fabric, which connects the type of OT-specific capabilities such as ruggedized hardware built to withstand industrial deployment environments with a broader enterprise security infrastructure that most organizations typically already have in place so IT or enterprise-wide security can be maintained without developing a separate management solution for OT.
One of the key differentiators of Fortinet’s strategy is its OT-aware network segmentation, which enables organizations to implement fine-grained access controls between IT and OT zones without disrupting industrial processes. Fortinet’s OT portfolio features purpose-built for industrial and hardened firewall and switching solutions, as well as dedicated operational technology security, management insights to security teams into OT-specific threats and vulnerabilities.
The scope of the OT security challenge facing industrial organizations continues to grow: as documented in coverage of OT security manufacturing challenges, manufacturers are confronting expanding attack surfaces driven by IT/OT convergence, inadequate asset visibility, and legacy technology that was not designed with cybersecurity in mind. Fortinet’s integrated approach, combining network security, endpoint protection, and OT-specific threat intelligence within a unified management plane is designed to address these challenges without requiring organizations to operate entirely separate security stacks for each environment.
Dragos
Dragos is one of the largest-known purpose-built OT security platforms that has been developed for industrial environments which is a natural fit for this type of architecture, rather than being adapted from enterprise IT security products. Developed from one of the largest collections of OT-specific adversary data in the sector, their platform is designed for ICS/OT threat detection, incident response and threat intelligence.
It uses non-destructive passive methods to continually monitor OT network traffic and detects threats through behavioral analysis supported by a library of OT-specific threat signatures. Dragos provides industrial organizations with context far beyond generic cybersecurity threat feeds, maintaining dedicated intelligence on the top threat groups targeting industrial organizations worldwide. No matter how the OT/ICS Year in Review annual reports that firm publishes have turned into a de facto guidepost for who is up and coming inside the changing industrial threat profile.
Research drawing from Dragos’ 2026 report, covered in OT threat landscape research, describes a threat environment in which adversaries are actively mapping control loops and moving toward operational disruption with growing speed and sophistication, underscoring the importance of OT-specific threat intelligence as a core component of industrial security programs.
Dragos is especially relevant for critical infrastructure organizations – think energy, water and manufacturing sectors that experience highly sophisticated, targeted threat actor activity and need OT-specific threat intelligence as a means to provide context around their detection and response techniques.
Claroty
Claroty is also a holistic OT and IoT security platform provider whose purpose is to provide industrial operators with complete visibility across all their connected assets, IT/OT/IoT vulnerability analysis, mitigation of cyber risk and asset protection throughout the entire lifecycle of those assets. It focuses on asset discovery, risk assessment, network protection and secure remote access as part of a consolidated architecture that spans both on-premises and cloud deployments.
The Claroty platform shines in the breadth of industrial protocols it supports, which lets it uniquely identify and profile numerous OT assets, including PLCs, RTUs, HMIs, and engineering workstations across vendor estates. This visibility of assets is crucial because organizations that cannot see, they cannot protect and this pain point remains acute in industrial environments where asset inventories are often incomplete or inaccurate.
Another persistent OT security gap is the need to provide vendor and contractor access to industrial systems without exposing the entire plant. The platform uses policy-based controls on the remote sessions, offering monitoring and audit functionalities that are often missing from general-purpose remote access tools when they are applied to OT environments.
Nozomi Networks
Nozomi Networks Nozomi has established a strong reputation for OT and IoT security visibility, combining passive network monitoring with AI-based anomaly detection to discover threats and operational issues across all industrial environments. The platform accommodates on-premises appliances to cloud-based management, scales down for small industrial sites and up to large, globally distributed operations.
Nozomi platform: A distinguishing feature of the linters! 2 in terms of cybersecurity and operational monitoring It gives security teams context to detect threats and respond to incidents while bringing operational technology teams focused on uptime operational anomalies in the form of strange process behavior, device health indicators, and communication pattern changes. This dual-use capability has made Nozomi appealing for environments where IT and OT teams need to get common insights without needing separate systems for each function.
Over time, driven by the evolution of an accurate understanding of what is normal industrial process behavior versus anomalous cyber or physical actions, the AI-based threat detection within the platform continuously increases detection accuracy reducing false positives in monitored OT networks.
Armis
Available with wide coverage across IT, OT and IoT environments, the Armis asset intelligence and security platform is proposed as a single solution for organizations that need to effectively implement the security of converged IT/OT infrastructure. Asset discovery and classification, which is the company’s most important capability, as it can discover and profile devices including industrial controllers, medical devices, building systems but also enterprise IT assets, without the need to deploy an agent that may not be supported on legacy OT hardware.
The task of Armis within the OT security challenge relates to visibility; they deliver ongoing asset monitoring and risk scoring, providing security teams with an at-a-glance view into their continuously evolving OT attack surface. This platform is attractive and well-suited for those organizations that need integrated visibility across both IT and OT environments as the dividing line between those two environments has become somewhat obscured due to IT/OT convergence.
Frequently Asked Questions
What makes purpose-built OT security vendors different from an IT security vendor that has slapped on some OT capabilities?
Purpose-built OT security vendors build their platforms around the unique requirements of industrial environments from day one passive monitoring techniques that never disrupt live processes, native support for critical protocols like Modbus, DNP3 and Profinet, and threat intelligence focused on the ICS and SCADA adversary landscape. IT security vendors extending into OT may offer broader platform coverage, but tend to be more complicated to deploy effectively and safely in environments where active scanning or agent deployment can disrupt critical systems.
How does the OT security platform address environments with legacy devices that cannot run agents or modern security tooling?
Most top OT security platforms are designed as passive solutions that monitor traffic on a span port or tap, rather than requiring software installation on the devices being monitored. This enables the platform to identify, profile and monitor industrial devices, even those running legacy operating systems or unsupported firmware, without modification to those devices. Passive monitoring is the de facto industry standard for leveraging OT security because many industrial environments still have devices and protocols in the field that cannot withstand intrusive security tooling.
What features should industrial organizations consider when assessing OT security vendors?
Main evaluation characteristics include range of industrial protocol support, fidelity of asset discovery of the particular device ecosystem present in that environment, threat intelligence quality and OT-specificity from the vendor, how well it integrates with your current security operations tooling and visit experience with threats the subject industrial sector is dealing with. Organizations should also consider the flexibility of the deployment model—on-premises, cloud or hybrid to make sure that the platform can be deployed consistently across all relevant locations.
