IonQ to Buy Cybersecurity Firm Elisity in $1.3 Billion All-Stock Deal

Quantum computing company IonQ said Monday it has agreed to acquire cybersecurity firm Elisity in an all-stock transaction valued at up to $1.3 billion, its latest move to build a cybersecurity business alongside its quantum hardware.

The announcement marks one of the largest quantum-sector deals of the year.

Under the terms, up to $150 million of the price comes as earn-outs tied to Elisity's future performance, and the number of IonQ shares to be issued will be calculated at a price between $33.07 and $49.61 per share.

The deal is expected to close in the fourth quarter of 2026, subject to regulatory approval.

Elisity's chief executive, James Winebrenner, will continue to lead the business after the acquisition closes.

IonQ says the purchase pairs its post-quantum cryptography and quantum key distribution capabilities with Elisity's zero-trust enterprise security platform.

Elisity, founded in 2019 by former Cisco executives, has more than 100 customer deployments worldwide and has doubled both its revenue and customer base year over year, with zero churn among deployed customers.

"Q-Day is coming much faster than predicted," IonQ chief executive Niccolo de Masi said, referring to the point at which quantum computers could break widely used encryption.

The combined company plans to sell to enterprise and government customers bracing for attacks from future quantum machines, opening what IonQ calls a more than $10 billion microsegmentation opportunity.

The Elisity deal continues IonQ's aggressive expansion. The company completed its acquisition of chipmaker SkyWater Technology earlier this year to bring semiconductor manufacturing in-house, bought Oxford Ionics last year, and launched its Clavis XG quantum key distribution portfolio in June.

The push has drawn backing from the Trump administration, which signed executive orders over the summer aimed at building a powerful quantum computer and protecting the government against related cyber threats.

IonQ shares fell about 3.2 percent in premarket trading Monday, closing Friday at $39.89 with a market value of close to $16 billion.

Some investors worry the company is scaling too quickly in an industry still in its infancy, though the company argues the cybersecurity expansion is a natural extension of its quantum work.

Elisity's platform aims to stop cyberattackers or ransomware from spreading inside an organization, with customers including hospitals and healthcare companies.

IonQ says the combined platform will help clients deal with today's threats, including LLM-driven attacks, and prepare for the quantum era.

"The bad guys are going to keep taking advantage of new technology," de Masi told the Wall Street Journal. "Unfortunately, we are entering the most dangerous years, vis-a-vis cybersecurity risks."