# EDGAR Filing Document

**Accession Number:** 0001849820
**File Stem:** 0001594543-25-000007
**Filing Date:** 2025-8
**Character Count:** 6136
**Document Hash:** 5f3b4821ed35b5f96f01fc533ee18a0d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001594543-25-000007.hdr.sgml**: 20250813

**ACCESSION NUMBER**: 0001594543-25-000007

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250813

**DATE AS OF CHANGE**: 20250813

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Nauticus Robotics, Inc.
- **CENTRAL INDEX KEY:** 0001849820
- **STANDARD INDUSTRIAL CLASSIFICATION:** GENERAL INDUSTRIAL MACHINERY & EQUIPMENT, NEC [3569]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92701
- **FILM NUMBER:** 251211059

**BUSINESS ADDRESS:**
- **STREET 1:** 17146 FEATHERCRAFT LANE
- **STREET 2:** SUITE 450
- **CITY:** WEBSTER
- **STATE:** TX
- **ZIP:** 77598
- **BUSINESS PHONE:** 281-942-9069

**MAIL ADDRESS:**
- **STREET 1:** 17146 FEATHERCRAFT LANE
- **STREET 2:** SUITE 450
- **CITY:** WEBSTER
- **STATE:** TX
- **ZIP:** 77598

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** cleantech Acquisition Corp.
- **DATE OF NAME CHANGE:** 20210308
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** KERBER WILLIAM XAVIER III
- **CENTRAL INDEX KEY:** 0001594543

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** 3917 NE 104TH
- **CITY:** OKLAHOMA CITY
- **STATE:** OK
- **ZIP:** 73131

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Kerber William X. III
- **DATE OF NAME CHANGE:** 20131217

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 4)**

**Nauticus Robotics, Inc.**

*(Name of Issuer)*

**Common Stock**

*(Title of Class of Securities)*

**63911H207**

*(CUSIP Number)*

**William Kerber**<br>3917 NE 104TH ST<br>Oklahoma City OK 73131<br>405-373-6600

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**08/11/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **63911H207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**KERBER WILLIAM XAVIER III** | Name of reporting person<br>**KERBER WILLIAM XAVIER III** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**PF** | Source of funds (See Instructions)<br>**PF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**OKLAHOMA** | Citizenship or place of organization<br>**OKLAHOMA** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**1852696.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**1852696.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1852696.00** | Aggregate amount beneficially owned by each reporting person<br>**1852696.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.4%** | Percent of class represented by amount in Row (11)<br>**4.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock

**(b) Name of Issuer:**
Nauticus Robotics, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
17146 FEATHERCRAFT LANE, 17146 FEATHERCRAFT LANE, WEBSTER, TX, 77598

**Item 4. Purpose of Transaction**

As of the Issuer's recent 10-Q filing dated August 11, 2025 the Issuer stated total outstanding Common Stock of 42,267,643 shares. Mr. Kerber beneficially owns 1,852,696 shares or 4.4% of of the Issuer's outstanding Common Stock and has ceased to be a beneficial owner of five percent or more as of the date of the Issuer's 10-Q filing dated August 11, 2025.

**Item 5. Interest in Securities of the Issuer**

**(a)**
As of the date of this Amendment No. 4, Mr. Kerber beneficially owns 1,852,696 shares or 4.4% of the Issuer's outstanding shares of Common Stock. The beneficial ownership percentages used in this Schedule are calculated based on the 42,267,643 shares of Common Stock of the Issuer outstandingas stated in the Issuer's recent 10-Q filing dated August 11, 2025.

**(b)**
As of the date of this Amendment No. 4, Mr. Kerber has sole voting and dispositive power of the 1,852,696 shares or 4.4 % of the Issuer's Common Stock.

**(c)**
Mr. Kerber has not effected any transactions in the Common Stock during the past 60 days or since his most recent Schedule 13D filing dated April 10, 2025.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

As of the filing date of this Amendment, Mr. Kerber is not involved in any contracts, arrangements, under standings or relationships related to any securities of the Issuer.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** KERBER WILLIAM XAVIER III

**Signature:** WILLIAM XAVIER KERBER III

**Name/Title:** WILLIAM XAVIER KERBER III

**Date:** 08/13/2025