Company: IONQ
Filing Date: 2025-10-10
Form Type: 424B5
Source: 0001193125-25-236448
Chunk: 6

Company: IonQ, Inc.
Filing Date: 2025-10-10
Form: 424B5
Chunk 6
---
 changed its name to IonQ,
Inc., and Legacy IonQ changed its name to IonQ Quantum, Inc.

Our principal executive offices are located at 4505 Campus Drive, College Park, MD 20740,
and our telephone number is (301) 298-7997. Our corporate website address is https://ionq.com. Information contained on or accessible through our website is not a part of this prospectus, and the inclusion of
our website address in this prospectus supplement is an inactive textual reference only.

S-3

THE OFFERING

| Issuer | IonQ, Inc. |

| Common stock offered by us | 16,500,000 shares |

| Warrants offered by us | 43,010,800 Series B Warrants to purchase 43,010,800 shares of our common stock on or prior to the date that is seven years after the date such warrants are issued and 5,005,400 Pre-Funded                                                        
 Warrants to purchase 5,005,400 shares of our common stock on or prior to the date that is seven years after the date such warrants are issued. Each Series B Warrant is exercisable for one share of our common stock at an initial exercise price 
 of $155.00 per share of common stock. Each Pre-funded Warrant is exercisable for one share of our common stock at an exercise price of $0.0001 per share of common stock. This prospectus supplement also                                          
 relates to the offering of 48,016,200 shares of common stock issuable upon the exercise of the Warrants.                                                                                                                                           |

| Common stock outstanding prior to this offering | 330,928,070 shares as of October 7, 2025 (which amount does not include shares of our common stock issuable upon the exercise of outstanding options or the vesting of any outstanding equity awards or reserved for issuance pursuant to future 
 awards under our equity incentive plans, or upon exercise of any outstanding warrants).                                                                                                                                                          |

| Common stock to be outstanding after this offering | 347,428,070 shares (or 395,444,270 shares if the Warrants are exercised in full). |

| Use of proceeds | We estimate that our net proceeds from the sale of the securities in this offering, excluding the proceeds, if any, from the exercise of the Warrants, will be approximately $1,978.5 million, after deducting underwriting discounts and 
 estimated offering expenses.                                                                                                                                                                                                              |

| We currently intend to use