Company: IONQ
Filing Date: 2025-02-26
Form Type: S-3ASR
Source: 0001193125-25-036787
Chunk: 40

Company: IonQ, Inc.
Filing Date: 2025-02-26
Form: S-3ASR
Chunk 40
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5

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of College Park, State of Maryland, on February 26, 2025.

| IONQ, INC.                            |     |                   |
| By:                                   |     | /s/ Peter Chapman |
| Peter Chapman                         |     |                   |
| President and Chief Executive Officer |     |                   |

POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Peter Chapman and Thomas Kramer, and each of them, as his or her true and lawful attorney-in-factand agent, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments to this registration statement, including post-effective amendments, and registration statements filed pursuant to Rule 462 under the Securities Act, and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-factand agent and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith and about the premises, as fully for all intents and purposes as they, he or she might or could do in person, hereby ratifying and confirming all that said attorney-in-factand agent or any of them, or their, his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof. Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated:

| Signature           
 /s/ Peter Chapman   
 Peter Chapman       
 /s/ Thomas Kramer   
 Thomas Kramer       |     | Title                                                                                  
 President and Chief Executive Officer and Executive Chairman of the Board of Directors 
 (Principal Executive Officer)                                                          
 Chief Financial Officer                                                                
 (Principal Financial and Accounting Officer)                                           |     | Date              
 February 26, 2025 
 February 26, 2025 |
|:--------------------|:----|:---------------------------------------------------------------------------------------|:----|:----------------