Company: IONQ
Filing Date: 2025-10-10
Form Type: 424B5
Source: 0001193125-25-236448
Chunk: 2

Company: IonQ, Inc.
Filing Date: 2025-10-10
Form: 424B5
Chunk 2
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| Use of Proceeds                     |     |      |  6 |
| Selling Stockholders                |     |      |  7 |
| Description of Capital Stock        |     |      |  8 |
| Description of Debt Securities      |     |      |  9 |
| Description of Depositary Shares    |     |      | 17 |
| Description of Warrants             |     |      | 20 |
| Description of Subscription Rights  |     |      | 21 |
| Description of Purchase Contracts   |     |      | 22 |
| Description of Units                |     |      | 23 |
| Plan of Distribution                |     |      | 24 |
| Legal Matters                       |     |      | 27 |
| Experts                             |     |      | 27 |
| Where You Can Find More Information |     |      | 28 |
| Incorporation by Reference          |     |      | 29 |

ABOUT THIS PROSPECTUS SUPPLEMENT

This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of this offering and also adds to and updates
information contained in the accompanying prospectus and the documents incorporated by reference into this prospectus supplement and the accompanying prospectus. The second part is the accompanying prospectus, which gives more general information,
some of which may not apply to this offering. Generally, when we refer to this prospectus, we are referring to both the prospectus supplement and the accompanying prospectus. In this prospectus supplement, as permitted by law, we “incorporate
by reference” information from other documents that we file with the Securities and Exchange Commission (the “SEC”). This means that we can disclose important information to you from those documents, which we may file with the SEC
from time to time. The information incorporated by reference is considered to be a part of this prospectus supplement and the accompanying prospectus and should be read with the same care. When we update the information contained in documents that
have been incorporated by reference by making future filings with the SEC, the information included or incorporated by reference in this prospectus supplement is considered to be automatically updated and superseded. In other words, in case of a
conflict or inconsistency between information contained in this prospectus supplement and information in the accompanying prospectus or incorporated by reference into this prospectus supplement, you should rely on the information contained in the
document that was filed later.

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