Company: IONQ
Filing Date: 2025-08-28
Form Type: 424B7
Source: 0001193125-25-191228
Chunk: 4

Company: IonQ, Inc.
Filing Date: 2025-08-28
Form: 424B7
Chunk 4
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, 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 supplement is an inactive textual reference only.

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THE OFFERING

| Issuer | IonQ, Inc. |

| Common stock offered by the selling stockholders | Up to 12,377,433 shares of our common stock. |

| Common stock outstanding prior to this offering | 297,682,418 shares of our common stock (as of August 25, 2025). The number of outstanding shares of our common stock will not change as a result of this offering. |

| Use of proceeds | The selling stockholders will receive all of the proceeds from the sale, if any, of shares of our common stock in this offering. We will not receive any proceeds from the sale of shares of our common stock by the selling stockholders. See the 
 section titled “Use of Proceeds” for more information.                                                                                                                                                                                             |

| Risk factors | Investing in our common stock involves significant risks. Before making an investment decision, please read the information contained in and incorporated by reference under the heading “Risk Factors” on page S-4 of this prospectus supplement and on page 4 of the accompanying prospectus, and under similar headings in other documents that are incorporated by reference into this prospectus supplement and the accompanying 
 prospectus.                                                                                                                                                                                                                                                                                                                                                                                                                           |

| NYSE symbol | Our common stock is listed on the NYSE under the symbol “IONQ.” |

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