Company: KITTW
Filing Date: 2025-09-02
Form Type: 424B3
Source: 0001849820-25-000222
Chunk: 2

Company: Nauticus Robotics, Inc.
Filing Date: 2025-09-02
Form: 424B3
Chunk 2
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. If our public float increases such that we may sell additional amounts under the Sales Agreement and the prospectus, of which the prospectus supplement is a part, we will file an amendment to the prospectus supplement prior to making additional sales.

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-3 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 August 29, 2025.

S-ii</div>

### THE OFFERING
| Common stock offered by us                                    |     | Shares of our common stock having an offering price of up to $1,300,000 or up to 1,413,013 shares, assuming the sale price of $0.92 per share, which was the closing price of our common stock on the Nasdaq on the Nasdaq on August 28, 2025. The actual number of shares issued will vary depending on the sales price under this offering. From July 18, 2025 through the date hereof, the Company issued and sold 1,346,132 shares under this offering for gross proceeds of approximately $1.40 million and net proceeds of approximately $1.30 million, after deducting commissions and offering expenses. |
| Shares Available                                              |     | As of August 28, 2025, shares of our common stock with an aggregate offering price of up to approximately $1,365,544 is available for sale.                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Common stock to be outstanding immediately after the offering |     | Up to 44,098,622 shares, assuming sales of 1,413,013 shares at a price of $0.92 per share, which was the closing price of our common