Company: IONQ
Filing Date: 2025-02-27
Form Type: 424B5
Source: 0001193125-25-037295
Chunk: 5

Company: IonQ, Inc.
Filing Date: 2025-02-27
Form: 424B5
Chunk 5
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 higher number of algorithmic qubits and higher levels of
fidelity than presently exists—prerequisites for quantum computing to reach broad quantum advantage.

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.

S-1

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 changed its name to IonQ, Inc., and Legacy IonQ changed its name to IonQ Quantum, Inc.

Our principal executive offices are
located at 4505 Campus Drive, College Park, MD 20740, and our telephone number is (301) 298-7997. Our corporate website address is https://ionq.com. Information contained on or accessible through our website
is not a part of this prospectus, and the inclusion of our website address in this prospectus is an inactive textual reference only.

S-2

THE OFFERING

| Issuer | IonQ, Inc. |

| Common stock offered by us | Shares of our common stock having an aggregate offering price of up to $500 million. |

| Common stock outstanding prior to this offering | 222,842,179 shares of common stock outstanding as of February 24, 2025. |

| Manner of offering | “At the market offering” that may be made from time to time through, or to, our sales agents. See “Plan of Distribution” on page S-11 of this prospectus supplement. |

| Use of proceeds | We currently intend to use the net proceeds from this offering for working capital and other general corporate purposes. See the section titled “