Company: KITTW
Filing Date: 2025-10-31
Form Type: 424B3
Source: 0001849820-25-000267
Chunk: 2

Company: Nauticus Robotics, Inc.
Filing Date: 2025-10-31
Form: 424B3
Chunk 2
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 contribution to Wainwright with respect to certain liabilities, including liabilities under the Securities Act or the Securities Exchange Act of 1934, as amended, or the Exchange Act.

As of October 31, 2025, the aggregate market value of the outstanding shares of our common stock held by non-affiliates was approximately $79,324,209, calculated in accordance with General Instruction I.B.6 of Form S-3 and was based on 13,597,456 shares outstanding held by non-affiliates, and a price per share of $5.85 which was the closing price of our common stock on the Nasdaq Capital Market on September 2, 2025. Therefore, the one third limitation on sales specified in General Instruction I.B.6 will no longer apply to additional sales made pursuant to this registration statement, which this prospectus supplement forms part of, on or subsequent to such date. The Company shall be eligible to use this prospectus supplement and the accompanying base prospectus pursuant to General Instruction I.B.1.

We are an emerging growth company and a smaller reporting company as defined under federal securities laws and, as such, may elect to comply with certain reduced public company reporting requirements for future filings. Investing in our securities involves certain risks. See “Risk Factors” on page S-7 of the prospectus supplement and on page 1 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.

#### H.C. Wainwright

#### & Co.
<div align='center'>The date of this prospectus supplement is October 31, 2025.

2</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                                      |     |