Company: IONQ
Filing Date: 2025-07-07
Form Type: 424B5
Source: 0001193125-25-155889
Chunk: 25

Company: IonQ, Inc.
Filing Date: 2025-07-07
Form: 424B5
Chunk 25
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unded Warrant and total underwriting discounts and commissions to be paid to the underwriter.

|                           |     | Underwriting  
 Discounts and 
 Commissions   |               |
|:--------------------------|:----|:--------------|--------------:|
| Per Share of Common Stock |     | $             |        1.1098 |
| Per Pre-Funded Warrant(1) |     | $             |        1.1098 |
| Total                     |     | $             | 19,999,999.90 |

| (1) | The Series A Warrants are being offered for no additional consideration. |

We estimate that the total expenses of this offering, including registration, filing and listing fees, printing fees and legal and accounting expenses, but excluding the underwriting discounts and commissions, will be approximately $1.5 million. A prospectus supplement in electronic format may be made available on the web sites maintained by the underwriter or selling group members, if any, participating in the offering. The underwriter may agree to allocate a number of shares to selling group members or otherwise for sale to online brokerage account holders. Internet distributions will be allocated by the underwriter and selling group members that may make Internet distributions on the same basis as other allocations. S-19

For a period of 60 days after the date of this prospectus supplement, we will not (i) offer, pledge,
sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend or otherwise transfer or dispose of, directly or indirectly, or submit to, or file with,
the Securities and Exchange Commission a registration statement under the Securities Act relating to, any shares of our common stock or any securities convertible into or exercisable or exchangeable for common stock, or publicly disclose the
intention to undertake any of the foregoing, or (ii) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences associated with the ownership of any shares of common stock or any such other
securities, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of common stock or such other securities, in cash or otherwise, in each case without the prior written consent of the underwriter, other
than the common stock and the accompanying warrants to be sold in this offering.

The restrictions described above do not apply to (i) the issuance
of, or