SEC Form 424B3 filed by Northann Corp.

Northann Corp.

This prospectus supplement updates, amends and supplements the prospectus dated November 13, 2025 (the “Prospectus”), which forms a part of our Registration Statement on Form S-1 (Registration No. 333-290562). Capitalized terms used in this prospectus supplement and not otherwise defined herein have the meanings specified in the Prospectus.

This prospectus supplement is being filed to update, amend, and supplement the information included in the Prospectus with the information contained in our Current Report on Form 8-K filed with the SEC on November 24, 2025, and our Preliminary Proxy Statement on Schedule 14A filed with the SEC on November 24, 2025, both of which are set forth below.

This prospectus supplement is not complete without the Prospectus. This prospectus supplement should be read in conjunction with the Prospectus, which is to be delivered with this prospectus supplement, and is qualified by reference thereto, except to the extent that the information in this prospectus supplement updates or supersedes the information contained in the Prospectus. Please keep this prospectus supplement with your Prospectus for future reference.

Our common stock is traded on NYSE American under the symbol “NCL.” On November 24, 2025, the last reported sale price of our common stock was $0.3981 per share.

Investing in shares of our Ordinary Shares involves risks that are described in the “Risk Factors” section beginning on page 16 of the Prospectus.

Neither the U.S. Securities and Exchange Commission nor any state securities commission has approved or disapproved of the securities to be issued under the Prospectus or determined if the Prospectus or this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is November 25, 2025.

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

Date of Report (Date of earliest event reported): November 23, 2025

2251 Catawba River Rd

Fort Lawn, SC 29714

(Address of Principal Executive Office) (Zip Code)

(916) 573 3803

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report)

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:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging Growth Company

x

If an emerging growth company, indicate by checkmark 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 13(a) of the Exchange Act.

¨

Item 1.01. Entry into a Material Definitive Agreement.

Asset Purchase Agreement with Kingsford Consultancy Ltd.

On November 23, 2025, the Northann Corp. (the “Company”) entered into an asset purchase agreement with Kingsford Consultancy Ltd. (“Kingsford”, and such agreement, the “Asset Purchase Agreement”).

Pursuant to the Asset Purchase Agreement, Kingsford agreed to provide to the Company certain proprietary software assets relating to a supply chain management system, including all related intellectual property rights therein (the “Software”), pursuant to the terms of the Asset Purchase Agreement.

As consideration for the Software, the Company agreed to pay $5,000,000 as the purchase price, by issuing 12,500,000 shares of the Company’s common stock, par value $0.001 per share (the “Common Stock”) (the “Kingsford Shares”), i.e. $0.40 per share, to a designee to be designated by Kingsford.

The closing of the Asset Purchase Agreement is required to occur no later than three business days after all closing conditions are satisfied or waived, or at such other times as the parties may agree. The closing conditions include but not limited to, the approval of the issuance of the Kingsford Shares by the Company’s stockholders and the NYSE American. Kingsford represented and warranted, amongst others, that neither Kingsford nor its designee is an affiliate of the Company, and that the Kingsford Shares are being acquired for investment purposes only, without a view to distribution, and in compliance with all applicable securities laws.

The Kingsford Shares shall be issued pursuant to the exemption from registration provided by Section 4(a)(2) of the Securities Act of 1933, as amended. The Kingsford Shares shall constitute restricted securities and will bear a restrictive legend as set out under the Asset Purchase Agreement.

The foregoing description of the Asset Purchase Agreement does not purport to be complete, and is qualified in its entirety by reference to the Asset Purchase Agreement, filed as Exhibit 10.1 to this Current Report on Form 8-K.

Development Agreement with Asia Resource Holdings Limited

On November 23, 2025, the Company entered into a development agreement with Asia Resource Holdings Limited (“Asia Resource”, and such agreement, the “Development Agreement”).

Pursuant to the Development Agreement, Asia Resource agreed to develop and provide to the Company the NCL Customized Intelligent Decoration Platform, a customized software, including all intellectual property rights therein (the “Platform”).

As the consideration for the Platform, the Company agreed to pay $6,000,000, by issuing a total of 15,000,000 shares of the Company’s Common Stock (the “Asia Resource Shares”), i.e. $0.40 per share, in two separate tranches of 8,000,000 shares and 7,000,000 shares, respectively, to a designee to be designated by Asia Resource.

The first tranche of the Asia Resource Shares (i.e., 8,000,000 shares) shall be delivered by the Company within five business days after both of the Company’s stockholders and NYSE American approve the issuance of the Asia Resource Shares. Asia Resource should deliver the Platform within three business days after certain conditions set forth in the Development Agreement are satisfied, including but not limited to the issuance of the first tranche of the Asia Resource Shares. The second tranche of the Asia Resource Shares (i.e., 7,000,000 shares) shall be delivered by the Company within five business days after delivery of the Platform. Asia Resource represented and warranted, amongst others, that neither Asia Resource nor its designee is an affiliate of the Company, and that the Asia Resource Shares are being acquired for investment purposes only, without a view to distribution, and in compliance with all applicable securities laws.

The Asia Resource Shares shall be issued pursuant to the exemption from registration provided by Section 4(a)(2) of the Securities Act of 1933, as amended. The Asia Resource Shares shall constitute restricted securities and will bear a restrictive legend as set out under the Development Agreement.

The foregoing description of the Development Agreement does not purport to be complete, and is qualified in its entirety by reference to the Development Agreement, filed as Exhibit 10.2 to this Current Report on Form 8-K.

Item 3.02. Unregistered Sales of Equity Securities.

The disclosures contained in Item 1.01 of this Current Report on Form 8-K is incorporated by reference in this Item 3.02.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.