IonQ to Acquire Zero Trust Firm Elisity for Up to $1.3 Billion

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IonQ on Monday said it signed a definitive agreement to buy Elisity in a stock-only transaction worth up to $1.3 billion, according to SecurityWeek's report. Up to $150 million of that amount is earnout consideration, contingent on how Elisity's business performs. IonQ expects to complete the acquisition in the fourth quarter of 2026. The number of IonQ shares issued will depend on the company's volume-weighted average price over 20 trading days ending shortly before closing, a figure kept between $33.07 and $49.61.

This piece covers those stock terms, the least-privilege software Elisity sells, and IonQ's plan to pair it with post-quantum cryptography and quantum key distribution. It is for CISOs and for enterprise and government buyers who use Elisity or who are weighing IonQ's quantum computing, networking, sensing, and security portfolio. It also covers who stays in charge of Elisity once the deal is completed.

The offer: IonQ

IonQ's agreement to buy Elisity is definitive and stock-only, worth up to $1.3 billion. Up to $150 million of that sum is earnout consideration, contingent on how Elisity's business performs. IonQ expects to complete the acquisition in the fourth quarter of 2026. Monday's signing leaves the closing, the earnout, and the final share count still ahead. Elisity, the company IonQ agreed to buy, was founded in 2019. That earnout is the performance-based piece of the value IonQ stated on Monday.

The consideration is IonQ stock. The number of shares will depend on IonQ's volume-weighted average price over 20 trading days ending shortly before closing. The price used for that average will be kept between $33.07 and $49.61. Inside the band, that average sets how many shares are issued. IonQ did not state a fixed share count. The earnout of up to $150 million stays contingent on Elisity's performance. IonQ expects to complete the acquisition in the fourth quarter of 2026.

How to get IonQ

IonQ plans to reach buyers through relationships Elisity already has. The company will use Elisity's customer and CISO relationships to reach more enterprise and government buyers for post-quantum cryptography, quantum key distribution, and IonQ's quantum computing products. Elisity has more than 100 customer deployments, and the startup raised more than $70 million. Those deployments are the channel IonQ named for offering post-quantum cryptography and quantum key distribution to organizations that already run Elisity's least-privilege controls. IonQ already offers both cryptographic lines.

IdentityGraph is the component the two companies plan to extend. Elisity sells software that restricts which users, devices, workloads, and AI agents can communicate on enterprise networks, based on least-privilege policies. IdentityGraph combines what Elisity collects itself with data from partner tools, including identity, asset, and risk details, to guide access decisions. They plan to add cryptographic inventory and risk data to IdentityGraph so organizations can decide which post-quantum upgrades to tackle first, weighing business risk and the criticality of affected operations.

How IonQ to compares

IonQ's portfolio spans quantum computing, networking, sensing, and security, and the company already offers post-quantum cryptography and quantum key distribution. Elisity restricts which users, devices, workloads, and AI agents can communicate on enterprise networks under least-privilege policies. IdentityGraph combines Elisity's own data with data from partner tools, including identity, asset, and risk details, to guide access decisions. The agreement puts that access layer beside the cryptographic products IonQ already sells. Elisity, founded in 2019, has raised more than $70 million.

Elisity CEO James Winebrenner wrote in a blog post on the deal, "Access controls reduce exposure; cryptographic upgrades would address the underlying weaknesses." SecurityWeek's cybersecurity M&A tracker has cataloged roughly 300 deals to date in 2026. According to IonQ, Elisity has more than 100 customer deployments. IonQ plans to use those CISO relationships to reach more enterprise and government buyers for post-quantum cryptography, quantum key distribution, and quantum computing products. The deal is stock-only and worth up to $1.3 billion.

Who should buy IonQ

The buyers IonQ named are enterprise and government accounts, reached through Elisity's customer and CISO relationships. Elisity has more than 100 customer deployments. Its software applies least-privilege policies to users, devices, workloads, and AI agents on enterprise networks. IdentityGraph guides those decisions with identity, asset, and risk details from Elisity and from partner tools. IonQ wants post-quantum cryptography, quantum key distribution, and its quantum computing products in front of that installed base and of further buyers those CISOs can open.

In a press release, Winebrenner said, "Our customers need to prioritize post-quantum cryptography initiatives while securing existing assets to keep essential operations running." The plan to add cryptographic inventory and risk data to IdentityGraph is aimed at that ranking: which post-quantum upgrades to tackle first, weighing business risk and the criticality of affected operations. IonQ cited recent White House executive orders promoting quantum technology and pushing federal agencies to adopt post-quantum cryptography sooner. Elisity's existing management team remains in charge after completion.

The catch with IonQ

Up to $1.3 billion is the ceiling on the Elisity purchase, and up to $150 million of it is earnout consideration contingent on how Elisity's business performs. The whole transaction is stock-only. The number of IonQ shares issued will depend on the company's volume-weighted average price over 20 trading days ending shortly before closing, kept between $33.07 and $49.61. A different average inside that band means a different share count. Completion is expected in the fourth quarter of 2026, so the earnout and the share count remain open after Monday's signing.

Once the deal is completed, James Winebrenner and Elisity's existing management team will remain in charge of the business. IonQ CEO Niccolo de Masi pointed to Q-Day, the point at which quantum computers could break widely used public-key encryption, and said, "Q-Day is coming much faster than predicted." He gave no date for Q-Day. Elisity's least-privilege rules limit which users, devices, workloads, and AI agents can communicate. Cryptographic upgrades, which Winebrenner said would address the underlying weaknesses, remain separate work, including post-quantum cryptography that recent White House orders push federal agencies to adopt sooner.