Company: KITTW
Filing Date: 2025-06-30
Form Type: 424B3
Source: 0001849820-25-000159
Chunk: 2

Company: Nauticus Robotics, Inc.
Filing Date: 2025-06-30
Form: 424B3
Chunk 2
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 of the accompanying prospectus, and in the documents incorporated by reference herein and therein, for a discussion of the factors you should carefully consider before deciding to purchase our common stock.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

<div align='center'>2</div>

#### H.C. Wainwright

#### & Co.
<div align='center'>The date of this prospectus supplement is June 30, 2025.</div>

### TABLE OF CONTENTS
| ABOUT THIS PROSPECTUS SUPPLEMENT                     |     | S-1  |
| CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS |     | S-2  |
| ABOUT THE COMPANY                                    |     | S-5  |
| THE OFFERING                                         |     | S-6  |
| RISK FACTORS                                         |     | S-7  |
| USE OF PROCEEDS                                      |     | S-10 |
| DIVIDEND POLICY                                      |     | S-11 |
| DILUTION                                             |     | S-12 |
| DESCRIPTION OF COMMON STOCK                          |     | S-14 |
| PLAN OF DISTRIBUTION                                 |     | S-15 |
| LEGAL MATTERS                                        |     | S-16 |
| EXPERTS                                              |     | S-17 |
| WHERE YOU CAN FIND MORE INFORMATION                  |     | S-18 |
| INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE      |     | S-19 |

<div align='center'>1</div>

### ABOUT THIS PROSPECTUS SUPPLEMENT
This prospectus supplement is part of a registration statement that we have filed with the Securities and Exchange Commission, or SEC, utilizing a “shelf” registration process. Under the shelf registration process, we may offer shares of our common stock having an aggregate offering price of up to $663,814 from time to time under this prospectus supplement and the accompanying prospectus at prices to be determined by market conditions at the time of offering.

We provide information to you about this offering of shares of our common stock in two separate documents that are bound together: (1) this prospectus supplement, which describes the specific details regarding this offering; and (2) the accompanying prospectus