Company: KITTW
Filing Date: 2025-01-17
Form Type: 424B3
Source: 0001849820-25-000035
Chunk: 1

Company: Nauticus Robotics, Inc.
Filing Date: 2025-01-17
Form: 424B3
Chunk 1
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16, 2025 was $2.22 per share.

We are an “emerging growth company” as defined under the federal securities laws and, as such, have elected to comply with certain reduced public company reporting requirements.

Investing in our securities is highly speculative and involves a high degree of risk. See

#### “Risk Factors”

#### beginning on page 6.
Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

<div align='center'>The date of this prospectus supplement is January 17, 2025</div>

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 8-K

### CURRENT REPORT

#### PURSUANT TO SECTION 13 OR 15(d) OF THE

#### SECURITIES EXCHANGE ACT OF 1934
<div align='center'>Date of Report (Date of earliest event reported):</div>

#### January 15, 2025

#### NAUTICUS ROBOTICS, INC.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Delaware                     |     | 001-40611               |     | 87-1699753         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission File Number |     | -IRS Employer      
 Identification No. |

<div align='center'>17146 Feathercraft Lane, Suite 450, Webster, TX 77598

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (281) 942-9069</div>

#### Not Applicable
<div align='center'>(Former name or former address, if changed since last report)</div>

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☐ |     | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)                  |
| ☐ |     | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)                 |
| ☐ |     | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2