Company: IONQ
Filing Date: 2025-02-26
Form Type: S-3ASR
Source: 0001193125-25-036787
Chunk: 1

Company: IonQ, Inc.
Filing Date: 2025-02-26
Form: S-3ASR
Chunk 1
---
 check the following box. ☒ If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☒ |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer   |     | ☐ |     | Smaller reporting company |     | ☐ |
|                         |     |   |     | Emerging growth company   |     | ☐ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of Securities Act. ☐

Explanatory Note

We are filing this registration statement to replace our registration statement on Form S-3 (File No. 333-275444), filed with the Securities and Exchange Commission on November 9, 2023 and declared effective on December 1, 2023 (the “Prior Registration Statement”). In accordance with
Rule 415(a)(6), effectiveness of this registration statement will be deemed to terminate the Prior Registration Statement.

PROSPECTUS

IonQ, Inc.

Common Stock

Preferred Stock

Debt Securities

Depositary Shares

Warrants

Subscription Rights

Purchase Contracts

Units

We may issue
securities from time to time in one or more offerings, in amounts, at prices and on terms determined at the time of offering. This prospectus describes the general terms of these securities and the general manner in which these securities will be
offered. We will provide the specific terms of these securities in supplements to this prospectus, which will also describe the specific manner in which these securities will be offered and may also supplement, update or amend information contained
in this prospectus. You should read this prospectus and any applicable prospectus supplement before you invest.

In addition, the selling
stockholders to be