Elisity

Elisity makes software that limits which users, devices, workloads and AI agents on an enterprise network can talk to each other, an approach usually called identity-based microsegmentation. Its aim is to stop an attacker who gets into one machine from moving across the rest of the network, without asking the customer to install new hardware. In October 2026 the quantum computing company IonQ signed a definitive agreement to acquire it in an all-stock deal valued at up to 1.3 billion US dollars, expected to close in the fourth quarter of 2026.

What it does

The core of the product is IdentityGraph, which combines what Elisity observes on the network with identity, asset and risk information from partner tools, so each device or workload is known by what it is rather than only by its IP address. On top of that, a software policy layer decides which identities may communicate and enforces those rules through the switches and firewalls a customer already runs. Elisity's pages stress that policies can be simulated before they are switched on, which addresses the usual fear in segmentation projects of breaking something that matters. Its use cases include network asset discovery and visibility, IoT and OT segmentation, medical device security and controls for agentic AI.

Who it serves

Elisity sells to enterprises and says its team concentrates on making microsegmentation practical across enterprise, healthcare and industrial networks. IonQ's announcement credits it with more than 100 customer deployments and a growing number of Fortune 500 customers.

Key facts

• Founded: 2018, according to Elisity's own site (IonQ's announcement gives 2019)
• Chief executive: James Winebrenner, in the role since 2020
• Funding before the sale: seed of 7.5 million dollars, Series A of 26 million and Series B of 37 million, as listed on its site; investors named include TCV, Insight Partners, Atlantic Bridge, Two Bear Capital and Allegis Capital
• Main product: Elisity IdentityGraph with its policy enforcement layer
• Ownership: IonQ agreed on 12 October 2026 to acquire the company, subject to regulatory approval