ILLUMIO

Andrew Rubin and PJ Kirner were cybersecurity veterans who realized the industry was spending billions defending network perimeters (firewalls, intrusion detection) while ignoring what happened after an attacker got inside. In 2013, they founded Illumio to pioneer microsegmentation — creating internal security boundaries within a network.

Instead of one castle wall, you get thousands of internal walls. If an attacker compromises one server, they can't reach the next one.

SaaS subscriptions. Enterprises pay annual fees based on the number of workloads (servers, containers, endpoints) protected.

Illumio's software creates a real-time map of all application communications and then enforces segmentation policies. The platform works across on-premise data centers, cloud environments, and hybrid setups.

Illumio Core — microsegmentation for data centers and cloud. Illumio CloudSecure — visibility and segmentation for multi-cloud environments.

Illumio Endpoint — extending segmentation to laptops and desktops. Illumio Application Dependency Map — visualization of all application communications.

Zero Trust momentum. The cybersecurity industry shifted toward "Zero Trust" architecture (trust nothing, verify everything).

Microsegmentation is a core component of Zero Trust. As CISOs adopted Zero Trust frameworks, Illumio became a natural purchase.

They also benefited from high-profile breaches (Colonial Pipeline, SolarWinds) that proved perimeter security wasn't enough.

Market education. Microsegmentation is technically complex, and many organizations struggle to implement it without disrupting their existing applications.

Illumio has to convince security teams that the implementation pain is worth the protection. Competition from Akamai (which acquired Guardicore) and VMware (built-in microsegmentation) has intensified.

Andreessen Horowitz, General Catalyst, Accel, JPMorgan, and various other investors participated. The $225M Series F in 2021 valued the company at approximately $2.75 billion.