IonQ will acquire cybersecurity startup Elisity in an all-stock deal valued at up to $1.3 billion, a move the quantum-computing company says is designed to defend against attacks targeting generative AI large-language models and AI agents2. The price includes up to $150 million in performance-based earnouts contingent on Elisity meeting certain business milestones1. The deal is expected to close in the fourth quarter, subject to regulatory approval.
IonQ shares fell more than 9% on Monday following the announcement.
AI-threat rationale
The acquisition is explicitly framed around AI security. The combined entity will give IonQ expanded tools to detect and defend against AI-driven cyberattacks and to protect against emerging quantum threats, the companies said. CEO Niccolo de Masi told CNBC that Elisity's platform will bolster IonQ's quantum security strategy. "This means that we can protect not only critical infrastructure — we believe better than anyone in the world — but of course the Fortune 500," de Masi said.
Elisity offers a software platform that automatically maps devices on a corporate network, identifying workstations, servers, and specialized endpoints such as factory sensors, then collects technical data about each device including its manufacturer and the users who access it. The company helps stop cyberattacks and ransomware from spreading across organizations3.
Elisity will retain its current leadership, including CEO James Winebrenner.
IonQ's acquisition pace
The deal extends a rapid buying spree. IonQ previously acquired Swiss startup ID Quantique, which developed physical quantum-encryption devices. It also bought semiconductor maker SkyWater Technology for $1.8 billion in July and acquired U.K.-based quantum computing startup Oxford Ionics within the past year and a half. IonQ's flagship product is the Superion 256, a 256-qubit quantum computer that debuted last month, using trapped-ion qubits controlled by a device made with standard chipmaking equipment rather than bulky lasers.
The deal follows two June executive orders from President Donald Trump aimed at building a quantum computer for scientific research by 2028 and protecting government systems from cyber threats.
ANALYSIS The AI-defense framing is notable: IonQ is positioning a quantum-computing hardware company as a full-stack security vendor against a threat class — AI-agent and LLM attacks — that independent researchers have been cataloging at accelerating pace[3]. Whether the Elisity platform's network-mapping capabilities translate into effective defenses against prompt-injection and agent-hijacking techniques remains untested in public benchmarks.