SEALSQ adds selected past reports to its prospectuses

SEALSQ Corp designated previously furnished Form 6-K reports for incorporation by reference into its Form F-3 registration statements, their base prospectuses and any outstanding prospectus supplements, except where later documents or reports supersede them.

Rhea-AI Filing Summary

SEALSQ Corp designated previously furnished Form 6-K reports for incorporation by reference into its Form F-3 registration statements, their base prospectuses and any outstanding prospectus supplements, except where later documents or reports supersede them. The designated materials include reports furnished May 8, August 10 and 26, September 14 and 25, and October 2, 2026; Exhibit 99.2 to the September 11 report, excluding Sections 1.1, 1.2, 2.2.11, 2.2.12, 2.3 and 3.5; and the October 14 report, excluding Exhibit 99.1. No other information from those reports or their exhibits is incorporated by this designation.

Key Terms

incorporated by reference, registration statement, base prospectus, prospectus supplement

4 terms

incorporated by reference regulatory

"incorporated by reference into the registration statement"

registration statement regulatory

"registration statement on Form F-3"

A registration statement is a formal document that companies file with a government agency to offer new shares of stock to the public. It provides essential information about the company's finances, operations, and risks, helping investors make informed decisions. Think of it as a detailed product description that ensures transparency and trust before buying into a company.

base prospectus regulatory

"into the base prospectus"

A base prospectus is a detailed document that provides essential information about a financial offering, such as a bond or share issue. It acts like a comprehensive guide for investors, explaining what the investment involves, the risks involved, and how the process works. This helps investors make informed decisions before committing their money.

prospectus supplement regulatory

"any prospectus supplement outstanding"

A prospectus supplement is an additional document provided alongside a company's main offering details, offering updated or extra information about a specific financial product being sold. It helps investors understand the latest terms, risks, and details of the investment, similar to how an update or revision clarifies or expands on original instructions, ensuring they have current and complete information before making a decision.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/16/2026 - 12:30 PM EDT Accepted by SEC EDGAR 10/16/2026 - 12:29 PM EDT Learn about SEC filing dates

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 October 2026

Commission File Number: 001-41709

SEALSQ CORP
(Exact Name of Registrant as Specified in Charter) 

N/A

(Translation of Registrant’s name into English)

British Virgin Islands		Avenue Louis-Casaï 58 1216 Cointrin, Switzerland		Not Applicable
(State or other jurisdiction of incorporation or organization)		(Address of principal executive office)		(I.R.S. Employer Identification No.)

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

SEALSQ Corp (the “Company”) hereby designates the following Reports on Form 6-K previously furnished to the Securities and Exchange Commission as incorporated by reference into the registration statement on Form F-3 of the Company (File No. 333-286098), as supplemented by the registration statement on Form F-3 filed pursuant to Rule 462(b) under the Securities Act of 1933, as amended (File No. 333-290874), and into the base prospectus and any prospectus supplement outstanding under each of the foregoing registration statements, to the extent not superseded by documents or reports subsequently filed or furnished by the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended:

	●	Report on Form 6-K furnished on May 8, 2026 (Film No. 26958507);
	●	Report on Form 6-K furnished on August 10, 2026 (Film No. 261258628);
	●	Report on Form 6-K furnished on August 26, 2026 (Film No. 261323126);
	●	Exhibit 99.2 (except for Sections 1.1, 1.2, 2.2.11, 2.2.12, 2.3 and 3.5) to the Report on Form 6-K furnished on September 11, 2026 (Film No. 261372954);
	●	Report on Form 6-K furnished on September 14, 2026 (Film No. 261376003);
	●	Report on Form 6-K furnished on September 25, 2026 (Film No. 261406473);
	●	Report on Form 6-K furnished on October 2, 2026 (Film No. 261437989); and
	●	Report on Form 6-K furnished on October 14, 2026, excluding Exhibit 99.1 (Film No. 261458506).

Except as expressly set forth above, no other information contained in, or furnished as an exhibit to, any Report on Form 6-K is incorporated by reference into the foregoing registration statements by virtue of this Report.

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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.

Date: October 16, 2026	SEALSQ CORP
	By:	/s/ Carlos Moreira
		Name:	Carlos Moreira
		Title:	Chief Executive Officer
	By:	/s/ John O’Hara
		Name:	John O’Hara
		Title:	Chief Financial Officer

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