IonQ agrees to buy Elisity in stock deal valued at up to $1.3 billion

IonQ has signed an agreement to acquire cybersecurity software company Elisity in an all-stock transaction valued at up to $1.3 billion. The proposed IonQ Elisity acquisition adds a zero-trust access-control business to the quantum computing company’s security portfolio, but the companies’ planned combined products remain a roadmap rather than a deployed offering.

Up to $150 million of the stated value is contingent on Elisity meeting performance targets. The companies expect the deal to close in the fourth quarter of 2026, subject to regulatory approval and customary closing conditions.

How is the IonQ Elisity acquisition structured?

The consideration is stock only. The final number of IonQ shares will be determined by the company’s volume-weighted average share price over 20 trading days shortly before closing, with the share price set within a range of $33.07 to $49.61, according to SecurityWeek.

The $1.3 billion figure is therefore a maximum transaction value, not all guaranteed consideration. The performance-based portion represents as much as $150 million of the total. Elisity CEO James Winebrenner and the company’s existing management team are expected to continue running the business after the transaction closes.

What does Elisity sell?

Elisity provides zero-trust microsegmentation software. Its platform applies least-privilege rules to determine which users, devices, workloads and AI agents can communicate on an enterprise network. Its IdentityGraph product combines identity, asset and risk information, including data from partner tools, to guide those access decisions.

In practical terms, access controls are intended to limit the systems an intruder can reach after gaining entry. Elisity says customers can simulate policies before enforcement. The company has also drawn a distinction between that containment layer and cryptographic upgrades: access controls can reduce exposure, while replacing vulnerable encryption addresses cryptographic weaknesses.

IonQ says Elisity has more than 100 customer deployments worldwide and has doubled revenue and customer count year over year. Those are company-reported operating claims, rather than independently reported financial results.

What is IonQ planning to add?

IonQ already offers post-quantum cryptography and quantum key distribution technologies, according to SecurityWeek. The companies plan to add cryptographic inventory and risk data to IdentityGraph, with the aim of helping security teams rank post-quantum cryptography upgrades by business risk and operational importance.

That planned integration addresses a different security job from network policy enforcement. Elisity’s software is meant to control access across current infrastructure; the proposed cryptographic inventory would be used to identify and prioritize systems needing encryption changes as organizations prepare for potential future threats from quantum computing.

The acquisition also gives IonQ an enterprise cybersecurity operation as it pursues a broader quantum-security business. IonQ has said it expects Elisity’s customer and CISO relationships to help reach enterprise and government buyers for its security and quantum offerings. Whether that commercial expansion occurs will depend on a deal that has yet to close and on the companies executing their stated product plans.

This story draws on original reporting from SiliconANGLE.