IonQ has signed a definitive agreement to acquire Elisity, a privately held Zero Trust security company specializing in identity-based micro-segmentation, in an all-stock transaction valued at up to $1.3 billion.
The headline figure includes up to $150 million in earnout consideration tied to Elisity’s revenue milestones. IonQ expects to close the deal in the fourth quarter of 2026, subject to regulatory approval. Elisity will continue to operate under its current CEO, James Winebrenner.
The acquisition pairs IonQ’s post-quantum cryptography (PQC) and quantum key distribution (QKD) portfolio, much of which was inherited from its 2025 purchase of ID Quantique, with a software platform already deployed within enterprise networks that controls which users, devices, workloads, and AI agents can communicate with one another.
The deal is the latest move in an acquisition campaign with few parallels among public quantum companies. Since the start of 2025, IonQ has acquired companies in quantum networking, quantum sensing, space-based communications, and semiconductor manufacturing.
Elisity is IonQ’s first acquisition of a mainstream enterprise security software vendor, and it extends the company furthest yet from its roots in quantum computing.
Deal at a Glance
| Item | Detail |
| Acquirer | IonQ, Inc. (NYSE: IONQ) |
| Target | Elisity, Inc., privately held, founded in 2019 |
| Agreement | Merger agreement signed October 9, 2026; announced October 12, 2026 |
| Consideration | All stock, valued at up to $1.3 billion, including up to $150 million in earnout |
| Earnout | Paid in IonQ shares based on Elisity revenue milestones between August 1, 2026 and January 31, 2028 |
| Share pricing | 20-day VWAP of IonQ stock, collared between $33.07 and $49.61 per share |
| Retention | Separate RSU pool valued at $100 million for continuing Elisity employees |
| Expected close | Fourth quarter of 2026, subject to regulatory approval |
| Leadership | Elisity continues under CEO James Winebrenner |
Who Is Elisity?
Elisity is a Zero Trust security company founded in 2019 that focuses on identity-based microsegmentation. Microsegmentation limits which network-connected entities can communicate, so an attacker who compromises one system cannot move laterally to others.
The practice has a reputation for long, disruptive deployments because traditional approaches require software agents on every host or require reworking VLANs, firewall rules, and network architecture. Elasticity built its business around removing that friction.
The core of the platform is Elisity IdentityGraph, which correlates identity, asset, and risk information from Elisity’s discovery and partner sources to build a picture of every user, device, workload, and non-human identity on the network.
A software policy layer then enforces least-privilege access rules using existing network infrastructure, independent of the underlying switching vendor. Security teams can simulate a policy before enforcing it, reducing the operational risk of locking down production communications.
The approach resonates in environments with many unmanaged devices that cannot run agents, including hospitals, manufacturers, and other operators with large IT, OT, and IoT footprints.
Strategic Rationale
IonQ frames the deal around Q-Day, the point at which a quantum computer can break today’s public-key cryptography, and around federal pressure to accelerate PQC migration (including a recent White House executive order).
The underlying logic is commercial, and four threads run through it.
Distribution for Quantum Security
IonQ has developed credible quantum security technology through ID Quantique, including national quantum-safe communication networks in Switzerland, Poland, Romania, and Slovakia. However, QKD remains a specialized sale to governments and telecom operators.
Elisity brings direct relationships with enterprise CISOs and a product already deployed within corporate networks. IonQ expects those relationships to become a channel for its PQC, QKD, and quantum computing offerings.
A Product That Sells Today
PQC migration is a multiyear program with uncertain timing, and enterprise budgets prioritize threats that exist now. Microsegmentation addresses ransomware containment and lateral movement, which CISOs fund today.
IonQ cites a microsegmentation market valued at more than $10 billion, growing at a double-digit rate. Owning a vendor in that market gives IonQ’s security segment recurring software revenue independent of the quantum computing timeline.
Cryptographic Visibility as the Bridge
The most technically interesting aspect of the deal is the shared roadmap to extend IdentityGraph with cryptographic inventory and risk information.
Every PQC migration starts with identifying where vulnerable cryptography resides and which systems depend on it. A platform that already maps every identity and communication path on the network is a natural place to surface that inventory, and microsegmentation provides a compensating control for legacy systems that cannot be upgraded quickly.
Revenue Quality and Diversification
IonQ reported 40% year-over-year growth in multiproduct revenue in its second quarter of 2026 and is encouraging customers to buy across computing, networking, sensing, and security. A fast-growing software security business improves the quality of IonQ’s revenue at a time when its market valuation rests heavily on future quantum computing sales.
The earnout, which pays only on Elisity revenue milestones through January 2028, ties part of the price to the continuation of that growth.
Integration
The combined offering unifies two layers of the security stack that enterprises currently purchase and operate separately. Elisity governs which entities can communicate across the network, while IonQ’s portfolio protects the confidentiality of their communications.
The disclosed integration plans include the following elements:
- Cryptographic inventory: IdentityGraph will be extended to include cryptographic inventory and risk data, providing security teams with visibility into which identities and communication paths rely on quantum-vulnerable algorithms.
- Least-privilege enforcement: Policies for users, devices, workloads, and AI agents are enforced via the existing network infrastructure, without host agents and independent of the switching vendor.
- Policy simulation: Teams model a policy’s impact before enforcing it, reducing the risk of disrupting production traffic.
- Quantum-safe defense in depth: IonQ will offer quantum-safe posture management, PQC, and QKD capabilities, along with Elisity segmentation, for enterprise and government networks.
- Cross-selling: IonQ plans to sell to Elisity’s enterprise accounts and introduce Elisity to IonQ’s government and telecom customers.
IonQ’s Acquisition Strategy
IonQ is among the most acquisitive companies in the quantum industry (and arguably in all of emerging deep tech). The company has completed more than ten acquisitions since 2023, and the pace accelerated sharply after Niccolo de Masi became CEO in early 2025.
IonQ disclosed a combined purchase price of $2.66 billion for the six acquisitions it completed in 2025, almost all of it paid in stock.
In 2026, it followed with Skyloom Global, Seed Innovations, and the $1.8 billion purchase of semiconductor foundry SkyWater Technology.
The deals follow a consistent pattern. Each fills a gap in IonQ’s vertically integrated, full-stack quantum platform spanning computing, networking, sensing, and security, and each expands the company’s addressable market beyond the arrival of fault-tolerant quantum computing.
The table below summarizes the major transactions:
| Company | Closed | Domain | What It Added |
| Entangled Networks | Jan 2023 | Quantum software | Distributed quantum computing and multi-QPU networking expertise |
| Qubitekk | Jan 2025 | Quantum networking | Entangled-photon networking hardware and patent portfolio |
| ID Quantique (about 86%) | Apr 2025 | Quantum security | QKD, quantum random number generation, national quantum-safe networks |
| Lightsynq Technologies | May 2025 | Quantum interconnect | Photonic interconnects and quantum memory |
| Capella Space | Jul 2025 | Space | SAR satellite constellation and a path to space-based QKD (about $425M) |
| Oxford Ionics | Sep 2025 | Quantum computing | Electronic Qubit Control trapped-ion chips (about $1.075B) |
| Vector Atomic | Oct 2025 | Quantum sensing | Optical atomic clocks and precision navigation sensors |
| Skyloom Global | Jan 2026 | Optical communications | Optical communications terminals for space and terrestrial links |
| Seed Innovations | Jan 2026 | Software | Machine learning, DevOps, and cloud architecture talent (about $30M) |
| SkyWater Technology | Jul 2026 | Semiconductor manufacturing | DMEA Trusted Foundry for chip design, fabrication, and packaging (about $1.8B) |
| Elisity (pending) | Q4 2026 expected | Enterprise security | Identity-based microsegmentation and an enterprise CISO channel (up to $1.3B) |
Two features of this strategy shape the Elisity deal:
- IonQ uses its highly valued stock as acquisition currency, allowing it to buy revenue and capability without draining cash, but diluting existing shareholders with each transaction.
- IonQ tends to leave acquired companies operating under their own brands and leadership, as it did with ID Quantique and SkyWater.
This approach preserves customer relationships and talent in the near term, but it defers the more difficult work of integrating products into a single platform.
Elisity follows the same model, which limits disruption for its customers while leaving open the question of how quickly an integrated Zero Trust and quantum-safe offering reaches the market.
Analysis
The acquisition moves IonQ’s security business from a quantum specialty into the mainstream enterprise security market. It also provides IonQ with an answer to a question that has followed quantum security vendors for years, namely how a CISO without a quantum budget becomes a customer.
IonQ’s thesis holds that Zero Trust and PQC are converging, and that a single vendor can address both current threats and the cryptographic transition ahead.
The deal arrives with clear strengths, but also introduces some risk:
- Elisity provides recurring revenue and enterprise credibility that quantum security products alone could not generate
- The combined story aligns with federal PQC mandates, reinforcing IonQ’s federal business and the trusted domestic supply chain it gained with SkyWater
- IonQ has no history running a mainstream enterprise security software business, a market defined by long sales cycles, heavy channel dependence, and intense competition
- A price of up to $1.3 billion for a company with about $72 million in venture funding and undisclosed revenue implies a premium multiple that depends on Elisity sustaining its growth
- IonQ is still integrating a long list of acquisitions, including SkyWater, which closed at the end of July 2026, and management attention is a finite resource
Competitive Impact
Elisity competes in a crowded microsegmentation and Zero Trust market, where larger security platforms, several of which have bought or built agentless segmentation, dominate.
On the quantum-safe side, IonQ faces competitors with expertise in cryptographic discovery and PQC migration. No competitor today combines enterprise microsegmentation with an owned QKD and PQC portfolio, and that combination is the clearest point of distinction for the merged business.
The table below summarizes the main alternatives.
| Alternative | Model / Approach | Strengths | Compared to IonQ + Elisity |
| Illumio | Agent-based host microsegmentation with cloud and endpoint coverage | Category pioneer with a large enterprise installed base | Deeper data center and cloud workload coverage; agents limit reach into IoT and OT, where Elisity is strongest |
| Akamai Guardicore | Agent-based segmentation with agentless options within Akamai’s security portfolio | Broad operating system coverage and Akamai’s enterprise reach | Comparable segmentation depth; no quantum-safe cryptography portfolio |
| Zscaler | Zero Trust Exchange plus agentless LAN segmentation from its 2024 Airgap Networks acquisition | Large platform footprint and security service edge customer base | Strongest platform rival for agentless segmentation, with a bundling advantage over a standalone product |
| Cisco | Network-based segmentation through ISE, TrustSec, and Secure Workload | Owns the switching infrastructure in many target accounts | Elisity is switch-vendor agnostic; Cisco can embed segmentation in existing contracts |
| SandboxAQ | AQtive Guard cryptographic inventory and PQC migration software | Early leader in cryptographic discovery and management | Direct rival for the planned cryptographic inventory capability; no segmentation enforcement |
| IonQ and Elisity | Agentless identity-based microsegmentation plus PQC, QKD, and quantum-safe posture management | Only vendor pairing segmentation with an owned quantum security portfolio | Differentiated combination, though the integrated capability remains on the roadmap |
Differentiation is strongest in agentless enforcement for unmanaged devices and in the quantum-safe roadmap, because no segmentation competitor has a cryptography portfolio comparable to IonQ’s.
It is weakest against platform vendors such as Zscaler and Cisco, which can bundle segmentation into broader contracts, and in cryptographic discovery, where specialists such as SandboxAQ have a head start and the combined IonQ and Elisity capability does not yet exist.
Final Thoughts
IonQ has identified a real gap in its security business and filled it by acquiring a fast-growing company in a market that buyers fund today. Elisity’s agentless, identity-based approach addresses a longstanding barrier to microsegmentation adoption, and its customer relationships give IonQ a route to enterprise CISOs that quantum security alone could not open.
The earnout and retention pool demonstrate discipline by tying price to performance and protecting the team that built the business.
For IonQ, Elisity marks a turning point in its M&A strategy. Earlier deals assembled the quantum stack itself, from qubit chips to the foundry that makes them. This deal buys a mainstream enterprise security business and uses quantum security as the reason to own it.
Execution will be critical. It’s still early days for this market, and IonQ has a significant integration burden from its ongoing acquisition spree. We don’t yet have a good sense of how well equipped the company is to navigate these waters, but we’ll give it the benefit of the doubt.
If IonQ turns IdentityGraph into the place where enterprises find and remediate quantum-vulnerable cryptography, it will hold a position in the PQC transition that neither pure-play security vendors nor quantum rivals can easily match. It’s a strong move.
