[6-K] SEALSQ Corp Current Report (Foreign Issuer)

Rhea-AI Filing Summary

SEALSQ Corp reported that Dr. Hossein Rahnama resigned from its board of directors effective October 28, 2025. The company states that his resignation did not result from any disagreement with the board or the company, signaling a routine governance change rather than a dispute. The board is not planning to appoint another independent director until the next annual general meeting. The report also specifies that this information is incorporated by reference into SEALSQ’s existing Form F-3 and Form S-8 registration statements and their related prospectuses.

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 November 2025

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

Dr. Hossein Rahnama resigned from SEALSQ Corp’s (the “Company”) board of directors (the “Board”) effective October 28, 2025. Dr. Rahnama’s resignation did not result from any disagreement with the Board or the Company.

The Board is not considering appointing another independent director until the Company’s next annual general meeting.

The information contained in this Report on Form 6-K 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and any prospectus supplement outstanding under each of the foregoing registration statements, to the extent not superseded by documents or reports subsequently filed or furnished by the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934.

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: November 20, 2025	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

FAQ

What did SEALSQ Corp (LAES) announce in this Form 6-K?

SEALSQ Corp announced that Dr. Hossein Rahnama resigned from its board of directors effective October 28, 2025, and that the board does not plan to appoint another independent director until the next annual general meeting.

Did Dr. Hossein Rahnama resign from SEALSQ Corp due to a disagreement?

No. SEALSQ Corp states that Dr. Rahnama’s resignation did not result from any disagreement with the board or the company.

Will SEALSQ Corp (LAES) appoint a new independent director immediately?

No. The board is not considering appointing another independent director until the company’s next annual general meeting.

How does this 6-K affect SEALSQ Corp’s existing registration statements?

The information in this report is incorporated by reference into SEALSQ’s registration statement on Form F-3 (File No. 333-290963) and Form S-8 (File No. 333-287139), and into the related base prospectuses and any outstanding prospectus supplements.

Who signed the SEALSQ Corp Form 6-K for this board change?

The report was signed on behalf of SEALSQ Corp by Carlos Moreira, Chief Executive Officer, and John O’Hara, Chief Financial Officer.

What is the effective date of Dr. Rahnama’s resignation from SEALSQ Corp?

Dr. Hossein Rahnama’s resignation from the SEALSQ Corp board of directors was effective October 28, 2025.