6-K 1 ea0305207-6k_sealsq.htm REPORT OF FOREIGN PRIVATE ISSUER

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 September 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

The information contained in Exhibit 99.2 to this Report on Form 6-K, except for Sections 1.1, 1.2, 2.2.11, 2.2.12, 2.3, and 3.5 is hereby incorporated by reference into the registration statement on Form F-3 of the Company (File No. 333-290963), as amended, and the registration statement on Form S-8 of the Company (File No. 333-287139), 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and any prospectus supplement outstanding under each of the foregoing registration statements, to the extent not superseded by documents or reports subsequently filed or furnished by the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as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.

Exhibit No.		Description
99.1		Press release issued on September 11, 2026.
99.2		Half Year Report of SEALSQ Corp including Management’s Discussion and Analysis of Financial Condition and Results of Operations, issued on September 11, 2026.

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: September 11, 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