Company: IONQ
Filing Date: 2025-07-07
Form Type: 424B5
Source: 0001193125-25-155901
Chunk: 13

Company: IonQ, Inc.
Filing Date: 2025-07-07
Form: 424B5
Chunk 13
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 performance-based restricted stock units 
 outstanding as of March 31, 2025;                                                                          |

| • |     | 1,911,858 shares of our common stock issuable upon the exercise of public warrants outstanding as of 
 March 31, 2025;                                                                                      |

| • |     | 543,152 shares of our common stock issuable upon the exercise of warrants held by a customer outstanding as of 
 March 31, 2025; and                                                                                            |

| • |     | 33,470,867 shares of our common stock reserved for issuance pursuant to future awards under our 2021 Equity                                                                                                                           
 Incentive Plan (the “2021 Plan”) as of March 31, 2025, plus any future increases in the number of shares of our common stock reserved for issuance under our 2021 Plan pursuant to provisions thereof that automatically increase the 
 share reserve under the plan each year.                                                                                                                                                                                               |

S-10

To the extent that options outstanding as of March 31, 2025 have been or may be exercised, or other
shares issued, investors purchasing our common stock in this offering may experience further dilution. In addition, we may choose to raise additional capital due to market conditions or strategic considerations even if we believe we have sufficient
funds for our current or future operating plans. To the extent that additional capital is raised through the sale of equity or convertible debt securities, the issuance of these securities could result in further dilution to investors in this
offering.

S-11

DIVIDEND POLICY

We have never declared or paid any cash dividends on our capital stock and do not anticipate paying any cash dividends in the foreseeable future. Payment of
cash dividends, if any, in the future will be at the discretion of our Board and will depend on then-existing conditions, including our financial condition, operating results, contractual restrictions, capital requirements, business prospects and
other factors our Board may deem relevant.

S-12

DESCRIPTION OF WARRANTS

The Series A Warrants and the Pre-funded Warrants will each be issued pursuant to an individual warrant agreement between us and Continental Stock Transfer
& Trust Company, as the Warrant Agent (each, a “Warrant Agreement” and, collectively, the “Warrant Agreements”). Certain provisions of the Warrants are set forth herein but are only a summary and are qualified in their
entirety by the relevant provisions of such Warrant Agreements, the form of which will be filed as exhibits to