IonQ (NYSE: IONQ) fell sharply in morning trading, with shares sliding 9% to $36.19 after the quantum computing company announced a deal to acquire cybersecurity firm Elisity entirely in stock.
The all-equity structure of the transaction means existing IonQ shareholders bear the cost through dilution, as newly issued shares flow directly to Elisity’s owners rather than cash leaving the balance sheet.
The selloff deepens IonQ’s year-to-date losses, pushing the stock down 19% since January and making it the hardest-hit name across the quantum computing sector on the day.
D-Wave Quantum (NASDAQ: QBTS) fell alongside IonQ, with shares dropping 4% to $13.99, a shallower decline that reflects the fact that D-Wave faces no dilution question from the Elisity transaction.
Rigetti Computing (NASDAQ: RGTI) also declined 4%, with shares trading at $13.44, matching D-Wave’s loss and similarly insulated from the specific dilution concerns weighing on IonQ.
The broader quantum computing basket fared better than any of the individual names, with the Defiance Quantum ETF (NASDAQ: QTUM) falling just 1% to $150.07, while the SPDR S&P 500 ETF Trust (NYSEARCA: SPY) held flat at $778.69.
IonQ Chairman and CEO Niccolo de Masi announced the definitive agreement to acquire Elisity, a privately held Zero Trust enterprise security company, with closing expected in the fourth quarter of 2026 subject to regulatory approval.
De Masi stated that the combination positions IonQ to help customers protect critical infrastructure and enterprise networks throughout the transition to the quantum era.
Elisity’s IdentityGraph platform restricts each user, device, and workload to only the access it requires, and current Elisity CEO James Winebrenner is expected to continue serving existing customers as part of IonQ following the close.
IonQ cited a White House executive order issued this summer directing federal agencies to transition to post-quantum cryptography as the demand backdrop for the deal, alongside its prior deployment of quantum-safe national communications networks in Switzerland, Poland, Romania, and Slovakia.
The Elisity acquisition follows IonQ’s purchase of SkyWater Technology, which closed July 31 and was designed to expand IonQ’s chip design, fabrication, and packaging capabilities, continuing a pattern of buying capability rather than developing it organically.
By adding a software security business, IonQ gives shareholders exposure to a cybersecurity revenue stream that could generate income before quantum computing sales reach meaningful commercial scale.
With a reported beta of 3.4, IonQ stock has historically moved far more dramatically than the broader market, and the pending all-stock transaction introduces an additional layer of uncertainty heading into the fourth quarter close.
Investors watching the IonQ position will likely focus on three milestones: regulatory clearance, the formal closing of the acquisition, and early evidence that Elisity’s existing customers expand into post-quantum cryptography products from IonQ.
