Company: IONQ
Filing Date: 2025-07-07
Form Type: 424B5
Source: 0001193125-25-155901
Chunk: 12

Company: IonQ, Inc.
Filing Date: 2025-07-07
Form: 424B5
Chunk 12
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 number of shares of our common stock outstanding as of March 31, 2025. After giving effect to the sale of the number of shares 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 March 31, 2025 would have been approximately $1,704.7 million, or $6.53 per share. This represents an immediate increase in net tangible book value of $3.54 per share to existing stockholders and immediate dilution of $48.96 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                                                            |     |   |      |     | $ | 55.49 |
| Net tangible book value per share of as March 31, 2025                                     |     | $ | 2.99 |     |   |       |
| Increase in net tangible book value per share attributable to this offering                |     | $ | 3.54 |     |   |       |
| As adjusted net tangible book value per share as of March 31, 2025, after giving effect to 
 this offering                                                                              |     |   |      |     | $ |  6.53 |
| Dilution per share to new investors purchasing our common stock in this offering           |     |   |      |     | $ | 48.96 |

Investors that acquire additional shares through the exercise of the Warrants offered hereby may experience additional dilution depending on our net tangible book value at the time of exercise. The above discussion and table are based on 243,068,917 shares of our common stock outstanding as of March 31, 2025, and exclude:

| • |     | 13,454,097 shares of our common stock issuable upon the exercise of options outstanding as of March 31, 
 2025, at a weighted-average exercise price of $2.81 per share;                                          |

| • |     | 14,764,495 shares of our common stock issuable upon the vesting of restricted stock units outstanding as of 
 March 31, 2025;                                                                                             |

| • |     | 4,804,164 shares of our common stock issuable upon the vesting of