ot-security
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ColorTokens and the Art of Keeping a Breach Small
A compromised machine need not become a compromised company. ColorTokens sells the boundaries that make that distinction possible - and the tools to install them without stopping the business.
Fortra's Tripwire and the Art of Noticing
A cybersecurity company built a business around a small question: what changed? From a Purdue research project to power-grid audits, Tripwire shows why the unglamorous details deserve a very good alarm.
Claroty Secures the Machines You Can’t Just Reboot
Factories, hospitals, and airports need cybersecurity that respects the machinery. Claroty has built its business around a difficult promise: find the risk without stopping the work.
Tenable Found 336,000 Ways In. Its Next Trick Is Telling Security Teams Which Door to Close First
Nessus made Tenable famous for finding weaknesses. Tenable One is the nearly $1 billion-revenue company’s bet that the real product is judgment: connecting IT, cloud, identity, OT and AI risk, then showing an overworked security team what to fix first.
Acalvio’s Uncomfortable Bet: Make the Attacker Trust a Lie
Most security software watches the real network for suspicious behavior. Acalvio takes the stranger route: it fills the attacker’s map with convincing fiction - then waits for the lie to be touched.
Elisity’s Bet: Make the Switches You Already Own Stop the Next Breach
Hospitals and factories have thousands of devices they cannot patch, reboot or even name. Elisity’s answer is to identify them, limit where they can talk and make the existing network do the enforcing.
The Pentagon-Grade Cyber Range That Lets Security Teams Fail Before the Real Attack
Most companies discover whether their defenses work when someone breaks in. SimSpace built a safer place to find out first - a digital double where teams, tools and AI agents can be attacked on purpose.
Nozomi Networks Found a $1 Billion Business in the Networks Factories Were Afraid to Touch - Here’s the Playbook
Two researchers built a security company around an awkward industrial truth: you cannot defend machines you cannot see, and you cannot casually probe machines that keep cities running. Their passive-first wedge became a global platform, more than $100 million in annual revenue, and a $1 billion acquisition.
The $18.25 Million Security Bet That Asks One Rude Question: Do Your Defenses Actually Work?
SCYTHE grew from a one-off tool built with Target into a platform for continuously testing the security stack companies already own. Its sharpest idea is also its least comfortable: a control is only as good as the last realistic attack it caught.
The Company That Assumes Every File Is Trying to Kill You
Benny Czarny bootstrapped OPSWAT for 19 years on a simple, paranoid idea: assume every file is malicious. Today that assumption guards 98% of US nuclear plants.
Inside Inspira Enterprise's Five-Center Bet on Security Without Friction
The Mumbai company has spent years turning a sprawling partner ecosystem into one operating layer for cyber defense. Now it is adding AI agents, identity controls and enterprise workflows to the watch floor.
Fortinet
Fortinet is a global cybersecurity company founded in 2000 by brothers Ken and Michael Xie. Best known for its FortiGate firewalls and purpose-built security ASICs, Fortinet converges networking and security into a single platform - the Fortinet Security Fabric - powered by the FortiOS operating system. It serves enterprises, service providers, and governments in more than 100 countries, and in 2025 reported $6.8 billion in revenue.
Forescout Technologies Inc.
Forescout Technologies is a San Jose-based cybersecurity company that gives organizations agentless visibility and control over every connected device on their networks - from laptops and phones to industrial controllers, medical equipment and IoT sensors that cannot run traditional security agents. Its platform, now branded Forescout Vistaro, spans IT, OT, IoT and IoMT environments and combines asset discovery, network access control, segmentation, threat detection and exposure management, backed by the Vedere Labs threat-research team. Serving roughly 3,200 customers including one in five Fortune 500 companies and numerous government agencies, Forescout competes in the fast-growing market for securing the sprawling, mixed device estates of modern enterprises and critical infrastructure.
Hitachi Cyber
Hitachi Cyber is the global cybersecurity and performance analytics arm of the Hitachi Group, operating under Hitachi Systems Trusted Cyber Management Inc. With roots going back to 1999, it delivers 24/7 managed security services, threat intelligence, governance-risk-compliance advisory, and performance analytics to more than 350 private and government organizations across 50-plus countries. A network of Security Operations Centers spanning Canada, Switzerland, Japan, India and Poland - integrated with Google Security Operations, Microsoft Sentinel and Splunk - anchors its detection and response work across IT, OT and AI environments.
Dispel
Dispel is an Austin, Texas-based operational technology (OT) cybersecurity company that builds a Zero Trust Engine for industrial control systems. Its platform combines secure remote access, real-time industrial data streaming, unified OT connectivity (OTFusion), and 24/7 threat monitoring, all built around Moving Target Defense - a technique that constantly shifts network paths so attackers never get a stable target. Dispel lets manufacturers, utilities, energy operators, and government agencies give vendors and engineers fast, audited access to plant equipment without the friction of legacy VPNs and jump boxes.
Shift5
Shift5 is an operational intelligence and onboard observability company that taps the raw data already flowing across the internal networks of planes, trains, tanks, and ships. Founded by former U.S. Army cyber officers, it plugs into serial-bus and RF traffic on military and commercial fleets to deliver real-time cyber threat detection, predictive maintenance, and compliance insight at the edge. Backed by $185M+ in venture funding, Shift5 serves the U.S. Army, Navy, Air Force, Space Force, SOCOM, and several of the largest U.S. passenger rail systems.
ORDR
ORDR is a Santa Clara-based cybersecurity company that brings order to the chaos of connected devices, using AI to discover, profile, and protect every IT, IoT, IoMT, and OT asset on an enterprise network - from MRI machines at Cleveland Clinic to manufacturing PLCs - without agents.