Company: IONQ
Filing Date: 2025-10-10
Form Type: 424B5
Source: 0001193125-25-236448
Chunk: 5

Company: IonQ, Inc.
Filing Date: 2025-10-10
Form: 424B5
Chunk 5
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 number of stable qubits and
higher levels of fidelity than presently exists—prerequisites for quantum computing to reach broad quantum advantage.

Recent Developments

On July 11, 2025, we completed the acquisition of all of the issued and outstanding shares of Capella Space Corp. for 7,401,396
shares of our common stock, subject to customary post-closing adjustments.

On September 16, 2025, we completed the acquisition of all of the issued
and outstanding shares of Oxford Ionics Limited (the “Oxford Ionics Transaction”). The aggregate consideration delivered at the closing of the Oxford Ionics Transaction consisted of 25,372,150 shares of our common stock and $10,000,000
in cash.

S-2

On October 2, 2025, we completed the acquisition of all of the issued and outstanding shares of Vector
Atomic, Inc. (the “Vector Transaction”). The aggregate consideration delivered at the closing of the Vector Transaction consisted of 6,080,379 shares of our common stock.

We continue to actively evaluate and pursue other potential acquisitions and expect to acquire additional businesses. We cannot assure you that we will
identify or successfully complete transactions with suitable acquisition candidates in the future, nor can we assure you that any completed acquisitions will be successful. We have in the past, and expect in the future, to issue equity as
consideration in some or all of these transactions.

Corporate information

IonQ, formerly known as dMY Technology Group, Inc. III (“dMY”), was incorporated in the state of Delaware in September 2020 and formed as a special
purpose acquisition company. Our wholly owned subsidiary, IonQ Quantum, Inc. (formerly known as IonQ, Inc., and referred to as “Legacy IonQ” herein), was incorporated in the state of Delaware in September 2015.

On March 7, 2021, Legacy IonQ entered into an Agreement and Plan of Merger (the “Merger Agreement”), with dMY and Ion Trap Acquisition Inc.,
a direct, wholly owned subsidiary of dMY (the “Merger Sub”). Pursuant to the Merger Agreement, on September 30, 2021, the Merger Sub was merged with and into Legacy IonQ with Legacy IonQ continuing as the surviving corporation
following the merger, becoming a wholly owned subsidiary of dMY, and the separate corporate existence of the Merger Sub ceased (the “Business Combination”). Following the closing of the Business Combination, dMY