UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 under the

Securities Exchange Act of 1934

For the month of December 2024

Commission File Number: 001-41709

 SEALSQ CORP

(Exact Name of Registrant as Specified in Charter)

N/A

(Translation of Registrant’s name into English)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

☒ Form 20-F         ☐ Form 40-F

Registered Direct Offering

Securities Purchase Agreement

On December 12, 2024, SEALSQ Corp (the “Company”) entered into a Securities Purchase Agreement (the “Purchase Agreement”) with several institutional investors named therein (the “Investors”), pursuant to which the Company agreed to sell and issue 7,692,308 ordinary shares of the Company (the “Ordinary Shares”) to the Investors at a purchase price of US$1.30 per Ordinary Share, in a registered direct offering (the “Offering”). The closing of the registered direct offering is expected to occur on December 16, 2024 (the “Closing Date”), subject to customary closing conditions.

The gross proceeds to the Company from the Offering are expected to be approximately $10,000,000.00, before deducting the placement agent’s fees and other estimated offering expenses payable by the Company.

The Offering was made pursuant to the Company’s existing shelf registration statement on Form F-3 (File No. 333-283358), which was declared effective on November 27, 2024 by the U.S. Securities and Exchange Commission (the “Registration Statement”). A prospectus supplement to the Registration Statement is expected to be filed with the Commission on or around December 16, 2024.

Pursuant to the Purchase Agreement, the Company agreed not to issue, enter into any agreement to issue or announce the issuance or proposed issuance of, any Ordinary Shares of the Company or any securities convertible into or exercisable or exchangeable for Ordinary Shares of the Company or file any registration statement or prospectus, or any amendment or supplement thereto until the earlier of (i) 90 days after the Note Tranche Closing (as defined below) or (ii) March 31, 2025, subject to certain exceptions, without the prior consent of the Investors.

In addition, the Company agreed not to effect or enter into an agreement to effect any issuance of Ordinary Shares or any securities convertible into or exercisable or exchangeable for Ordinary Shares involving a Variable Rate Transaction (as defined in the Purchase Agreement) until 180 days after the Note Tranche Closing, subject to certain exceptions.

In addition, the Company agreed that the terms of the warrants issued by the Company to the Investors prior to the date hereof (each a “Prior Warrant” and collectively the “Prior Warrants”) will be modified, as of the Closing Date, as follows: (a) lowering of the exercise price of each Prior Warrant to $2.00 per Ordinary Share, and (b) increase in the quantity of each Prior Warrant such that the aggregate exercise price of the Prior Warrant equals the aggregate exercise price on the issuance date. Further, the Company agreed that if the Company and Purchasers do not close an additional convertible note tranche in an aggregate principle amount of $10.0 million pursuant to that certain securities purchase agreement, dated July 11, 2023, as amended, by January 16, 2025 (the “Note Tranche Closing”), then the reset above shall be based on the lowering of the exercise price to $1.00 per Ordinary Share (and also a corresponding increase in quantity of warrants as per (b) above).

Placement Agency Agreement

On December 12, 2024, the Company entered into a placement agency agreement (the “Placement Agency Agreement”) with Maxim Group LLC (the “Placement Agent”), pursuant to which the Company agreed to pay the Placement Agent an aggregate fee equal to 7.0% of the aggregate gross proceeds received by the Company from the sale of the Ordinary Shares in the Offering. The Company also agreed to reimburse the Placement Agent for up to $40,000 in accountable expenses, including the Placement Agent’s legal counsel’s fees.

The foregoing descriptions of the Purchase Agreement and the Placement Agency Agreement are qualified in their entirety by reference to the full text of the Purchase Agreement and the Placement Agency Agreement, respectively, forms of which are attached to this Report of Foreign Private Issuer on Form 6-K as Exhibits 10.1 and 10.2, respectively, and incorporated herein by reference.

The foregoing information contained in this Report on Form 6-K (this “Report”) and Exhibits 5.1, 10.1 and 10.2 filed herewith are hereby incorporated by reference in the Registration Statement and are deemed to be a part thereof from the date on which this Report is filed, to the extent not superseded by documents or reports subsequently filed with or furnished to the SEC.

This Report shall not constitute an offer to sell or a solicitation of an offer to buy any Ordinary Shares, nor shall there be any sale of Ordinary Shares in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or other jurisdiction.

SIGNATURES

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