As filed with the Securities and Exchange Commission on July 2, 2026

Registration No. 333-                   

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM S-8

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

NAUTICUS ROBOTICS, INC.

(Exact name of registrant as specified in its charter)

NAUTICUS ROBOTICS, INC. 2022 OMNIBUS INCENTIVE PLAN, AS AMENDED

(Full Title of the Plan)

Michael Ferrier

General Counsel

Nauticus Robotics, Inc.

17146 Feathercraft Lane, Suite 450

Webster, Texas 77598

(Name and Address of Agent for Service)

(281) 942-9069

(Telephone Number, including Area Code, of Agent for Service)

Copies to:

Robert C. Morris

Brandon T. Byrne

Norton Rose Fulbright US LLP

Norton Rose Fulbright Tower

1550 Lamar Street, Suite 2000

Houston, Texas 77010

(713) 651-8404

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☒

EXPLANATORY NOTE

This Registration Statement on Form S-8 is filed by Nauticus Robotics, Inc. (the “Company”) to register an aggregate amount of additional 603,764 shares of common stock, $0.0001 par value per share, of the Company (the “Common Stock”) for issuance pursuant to the Nauticus Robotics, Inc. 2022 Omnibus Incentive Plan, as amended (the “Plan”). The Plan was described in the Company’s definitive Proxy Statement for its 2026 Annual Meeting of Stockholders held on May 27, 2026. An amendment to the Plan to add 603,764 additional shares (adjusted to account for the reverse stock split on April 21, 2026) to the Plan was approved by the Company’s stockholders at that meeting.

The 603,764 shares being registered hereby are in addition to the shares of Common Stock registered by the Company’s prior Registration Statements on Form S-8 (the “Prior Registration Statements”) filed on January 23, 2023 (File No. 333-269349), July 16, 2024 (File No. 333-280824), July 11, 2025 (File No. 333-288641), and March 4, 2026 (File No. 333-294007), respectively. The contents of the Prior Registration Statements are incorporated by reference herein except as otherwise amended or superseded hereby. After giving effect to the additional shares registered under this Registration Statement, the aggregate number of shares of Common Stock registered for issuance under the Plan will be 750,000.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference

The following documents previously filed by the Company with the SEC are incorporated in this Registration Statement by reference:

All documents filed by us pursuant to Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934, as amended, subsequent to the effective date of this Registration Statement, prior to the filing of a post-effective amendment to this Registration Statement indicating that all securities offered hereby have been sold or deregistering all securities then unsold, shall be deemed to be incorporated by reference herein and to be part hereof from the date of filing of such documents. In no event, however, will any information that we have disclosed or may disclose under Item 2.02 or 7.01 (and any related exhibits) of any Current Report on Form 8-K that we have from time to time furnished or may furnish to the SEC be incorporated by reference into, or otherwise become part of, this Registration Statement. Any statement contained in any document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed to constitute a part of this Registration Statement, except as so modified or superseded.

Item 8. Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Webster, State of Texas, on July 2, 2026

POWER OF ATTORNEY

Each person whose signature appears below constitutes and appoints John W. Gibson, Jr. and Michael Ferrier, and each of them, singly, as such person’s true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for such person in such person’s name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting until each said attorney-in-fact and agents full power and authority to do and perform each and every act and thing requisite or necessary to be done in and about the premises, as fully to all intents and purposes as such person might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or either of them or their substitute or substitutes may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.