Company: IONQ
Filing Date: 2025-10-10
Form Type: 424B5
Source: 0001193125-25-236448
Chunk: 7

Company: IonQ, Inc.
Filing Date: 2025-10-10
Form: 424B5
Chunk 7
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 the net proceeds from this offering for working capital and other general corporate purposes. Additionally, we may use a portion of the net proceeds we receive from this offering to enter into 
 strategic acquisitions and partnerships. See the section titled “Use of Proceeds” for more information.                                                                                                                     |

| Risk factors | Investing in the securities 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-5 of this prospectus supplement, and under similar headings in other documents that are incorporated by reference into this prospectus supplement and the accompanying prospectus. |

| Exchange listing | Our common stock is listed on the NYSE under the symbol “IONQ.” We do not intend to list the Warrants on any exchange. |

S-4

| Settlement | We expect to deliver the shares and Warrants in book-entry form through the facilities of The Depository Trust Company on or about October 14, 2025, which is the second business day following the date of this prospectus supplement (such             
 settlement cycle being referred to as “T+2”). Under Rule 15c6-1 under the Securities Exchange Act of 1934, as amended, trades in the secondary market generally must settle in one business day, unless the parties to the trade agree                   
 otherwise. Accordingly, investors in this offering who wish to sell the shares and/or Warrants offered hereby before the trading day preceding the delivery of the shares and Warrants in this offering must specify an alternate settlement arrangement 
 at the time of the trade to prevent a failed settlement. Those investors should consult their advisors. See “Underwriting.”                                                                                                                              |

S-5

RISK FACTORS

Investing in our securities involves a high degree of risk. Before making a decision to invest in our securities, in addition to carefully considering the other information contained in this prospectus supplement, in the accompanying prospectus and in the documents incorporated by reference herein or therein, you should carefully consider the risks described below, as well as the risks discussed under the caption “Risk Factors” contained in our most recent Annual Report on Form 10-Kand any subsequent Quarterly Reports on Form 10-Q,each as amended or updated by our subsequent filings with the SEC, which are incorporated by reference into this prospectus supplement in their entirety. The risks described in these documents are not the only ones we face. There may be other unknown or unpredictable economic, business, competitive, regulatory or other factors that could harm our future results