Company: IONQ
Filing Date: 2025-10-10
Form Type: 424B5
Source: 0001193125-25-236452
Chunk: 12

Company: IonQ, Inc.
Filing Date: 2025-10-10
Form: 424B5
Chunk 12
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into strategic acquisitions and partnerships.

Pending the specific use of net proceeds as described in this prospectus supplement, we intend to invest
the net proceeds to us from this offering in short- and intermediate-term, interest-bearing obligations, investment-grade instruments, certificates of deposit or direct or guaranteed obligations of the U.S. government.

Our expected use of proceeds from this offering represents our current intentions based on our present plans and business condition. As of the date of this
prospectus supplement, we cannot predict with certainty all of the particular uses for the proceeds to be received upon the completion of this offering or the actual amounts that we will spend on the uses set forth above.

S-10

DILUTION Our net tangible book value as of June 30, 2025 was approximately $664.5 million, or $2.46 per share. Net tangible book value is total assets minus the sum of liabilities and intangible assets. Net tangible book value per share is net tangible book value divided by the total number of shares of our common stock outstanding as of June 30, 2025. After giving effect to the sale of the securities offered hereby as set forth on the cover page of this prospectus supplement (excluding shares issued and any proceeds received upon exercise of the Warrants), and after deducting underwriting discounts and estimated offering expenses payable by us, our as adjusted net tangible book value as of June 30, 2025 would have been approximately $2,643.0 million, or $9.08 per share. This represents an immediate increase in net tangible book value of $6.62 per share to existing stockholders and immediate dilution of $83.92 per share to investors purchasing our common stock in this offering at the public offering price. The following table illustrates this dilution on a per share basis.

| Public offering price per share                                                           |     |   |      |     | $ | 93.00 |
| Net tangible book value per share of as June 30, 2025                                     |     | $ | 2.46 |     |   |       |
| Increase in net tangible book value per share attributable to this offering               |     | $ | 6.62 |     |   |       |
| As adjusted net tangible book value per share as of June 30, 2025, after giving effect to 
 this offering                                                                             |     |   |      |     | $ |  9.08 |
| Dilution per share to new investors purchasing our common