SEALSQ Half Year Report furnished by WISEKEY (WSKEF) in Form 6-K

Rhea-AI Filing Summary

WISEKEY INTERNATIONAL HOLDING filed a Form 6-K as a foreign private issuer, primarily to provide investors with additional disclosure materials.

The filing furnishes as Exhibit 99.1 the Half Year Report of SEALSQ Corp, including its Management’s Discussion and Analysis of Financial Condition and Results of Operations, issued on September 9, 2025.

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 2025

Commission File Number: 001-39115

WISEKEY INTERNATIONAL HOLDING AG

(Exact Name of Registrant as Specified in Charter)

WISEKEY INTERNATIONAL HOLDING LTD

(Translation of Registrant’s name into English)

Canton of Zug, Switzerland	General-Guisan-Strasse 6 CH-6300 Zug, 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

Exhibit No.		Description
99.1		Half Year Report of SEALSQ Corp including Management’s Discussion and Analysis of Financial Condition and Results of Operations, issued on September 9, 2025.

2 

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 17, 2025	wisekey international holding ag
	By:	/s/ Carlos Moreira
		Name:   Carlos Moreira
		Title:     Chief Executive Officer
	By:	/s/ John O’Hara
		Name:   John O’Hara
		Title:     Chief Financial Officer

3

FAQ

What did WISEKEY INTERNATIONAL HOLDING (WSKEF) file in this Form 6-K?

WISEKEY INTERNATIONAL HOLDING filed a Form 6-K as a foreign private issuer. The submission mainly provides an exhibit containing SEALSQ Corp’s Half Year Report and related Management’s Discussion and Analysis of Financial Condition and Results of Operations.

What is included in Exhibit 99.1 of WISEKEY INTERNATIONAL HOLDING’s Form 6-K?

Exhibit 99.1 contains SEALSQ Corp’s Half Year Report. It also includes Management’s Discussion and Analysis of Financial Condition and Results of Operations, giving narrative context around SEALSQ’s financial position and performance for the relevant half-year period.

When was the SEALSQ Corp Half Year Report in the 6-K issued?

The SEALSQ Corp Half Year Report attached as Exhibit 99.1 was issued on September 9, 2025. That report, together with its management discussion and analysis, is incorporated into WISEKEY INTERNATIONAL HOLDING’s Form 6-K filing.

Who signed the WISEKEY INTERNATIONAL HOLDING Form 6-K?

The Form 6-K was signed on behalf of WISEKEY INTERNATIONAL HOLDING by Chief Executive Officer Carlos Moreira and Chief Financial Officer John O’Hara. Their signatures confirm the company’s authorization of the information furnished in this report.

Where is WISEKEY INTERNATIONAL HOLDING headquartered according to the Form 6-K?

WISEKEY INTERNATIONAL HOLDING lists its principal executive office at General-Guisan-Strasse 6, CH-6300 Zug, in the Canton of Zug, Switzerland. This Swiss address identifies the company’s primary corporate location in the filing.

What type of SEC reporting framework applies to WISEKEY INTERNATIONAL HOLDING?

WISEKEY INTERNATIONAL HOLDING files reports as a foreign private issuer under the Securities Exchange Act of 1934. This Form 6-K is submitted pursuant to Rule 13a-16 or 15d-16, which govern current reports by such issuers.