Filed by WISeKey International Holding AG
pursuant to Rule 425 under the Securities Act of 1933
Subject Company: WISeKey International Holding
AG
Commission File No.: 001-39115
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 August 2026
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 |
|
Press Release of WISeKey International Holding AG issued on August 3, 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: August 4, 2026 |
wisekey international holding ag |
| |
|
|
|
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By: |
/s/ Carlos Moreira |
| |
|
Name: |
Carlos Moreira |
| |
|
Title: |
Chief Executive Officer |
| |
|
|
|
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By: |
/s/ John O’Hara |
| |
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Name: |
John O’Hara |
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Title: |
Chief Financial Officer |
Exhibit 99.1

Publication pursuant to Article 61 para. 3 of the Ordinance
of the Takeover Board on Public Takeover Offers: WISeKey International Holding AG communicates the decision of the Takeover Board
Zug, 3 August 2026
Decision of the Takeover Board 947/01 dated 30 July
2026 concerning WISeKey International Holding AG / WISeKey International Corp. on the request of WISeKey International Holding AG and
WISeKey International Corp. regarding the determination of validity of an opting-out clause
On 30 July 2026, the Takeover Board rendered the following
decision (unofficial translation of the original German text):
| “1. | It is determined that the opting-out provision in the articles
of association of WISeKey International Corp. will be valid and effective under takeover law if this opting-out provision forms part
of the articles of association of WISeKey International Corp. no later than the time at which the merger of WISeKey International Holding
AG with and into WISeKey International Corp. becomes legally effective, and thus prior to the listing of the common shares of WISeKey
International Corp. on the SIX Swiss Exchange and on the Nasdaq Global Market. |
| 2. | WISeKey International Holding AG shall publish the position statement of its board of directors (if any),
the operative part of this decision, and the information regarding the objection right of qualified shareholders in accordance with articles
6 and 7 TOO. |
| 3. | This decision will be published on the website of the Takeover Board after WISeKey International Holding
AG has made the publication provided for in item 2 of this operative part. |
| 4. | The fee payable by WISeKey International Holding AG and WISeKey International Corp., with joint and several
liability, amounts to CHF 30,000.” |
Objection (article 58 of the Ordinance of the Takeover
Board on Public Takeover Offers; TOO)
A shareholder with a holding of at least 3% of the voting
rights of WISeKey International Holding SA, whether exercisable or not (a “qualified shareholder”, article 56 TOO), who has
not yet participated in the proceedings, may file an objection against the decision of the Takeover Board. The objection must be filed
with the Takeover Board within five trading days after the publication of the decision of the Takeover Board. The objection must contain
a formal request and a summary of the legal grounds, as well as proof of the holding in accordance with article 56 para. 3 and 4 TOO (article
58 para. 3 TOO).
Contact
Media and Investor Relations
Carlos Moreira, Chairman and CEO,
info@wisekey.com,
+41
22 594 30 00