Company: IONQ
Filing Date: 2025-06-06
Form Type: S-8
Source: 0001193125-25-137111
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Company: IonQ, Inc.
Filing Date: 2025-06-06
Form: S-8
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As filed with the Securities and Exchange Commission on June 6, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 IONQ, INC. (Exact name of registrant as specified in its charter)

| Delaware                                 |     |         85-2992192 |
| (State or other jurisdiction of          
 incorporation)                           |     |   -I.R.S. Employer 
 Identification No. |
| 4505 Campus Drive                        
 College Park, MD                         |     |              20740 |
| (Address of principal executive offices) |     |          -Zip Code |

Lightsynq Technologies Inc. 2024 Equity Incentive Plan (Full title of the plans) Stacey Giamalis Chief Legal Officer and Corporate Secretary IonQ, Inc. 4505 Campus Drive College Park, MD 20740 (301) 298-7997 (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies to: Katharine A. Martin Mark R. Fitzgerald Mark G.C. Bass Wilson Sonsini Goodrich & Rosati, P.C. 1700 K Street NW, Fifth Floor Washington, DC 20006 202-973-8800 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company, or 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 the Securities Act. ☐

EXPLANATORY NOTE IonQ, Inc. (the “ Registrant”) is filing this Registration Statement with the Securities and Exchange Commission