<SEC-DOCUMENT>0002121811-26-000001.txt : 20260318
<SEC-HEADER>0002121811-26-000001.hdr.sgml : 20260318
<ACCEPTANCE-DATETIME>20260318121154
ACCESSION NUMBER:		0002121811-26-000001
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20260318
FILED AS OF DATE:		20260318
DATE AS OF CHANGE:		20260318

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Levinger David
		CENTRAL INDEX KEY:			0002121811
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39115
		FILM NUMBER:		26767214

	MAIL ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		AVENUE LOUIS-CASAI 58
		CITY:			COINTRIN
		PROVINCE COUNTRY:   	V8
		ZIP:			1216

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Wisekey International Holding S.A.
		CENTRAL INDEX KEY:			0001738699
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROCESSING & DATA PREPARATION [7374]
		ORGANIZATION NAME:           	06 Technology
		EIN:				000000000
		STATE OF INCORPORATION:			V8
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ROUTE DE PRE-BOIS 29, P.O. BOX 853
		CITY:			GENEVA 15
		STATE:			V8
		ZIP:			CH-1215
		BUSINESS PHONE:		011-41-22-594-3034

	MAIL ADDRESS:	
		STREET 1:		ROUTE DE PRE-BOIS 29, P.O. BOX 853
		CITY:			GENEVA 15
		STATE:			V8
		ZIP:			CH-1215
</SEC-HEADER>
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<TYPE>3
<SEQUENCE>1
<FILENAME>form3-03182026_040350.xml
<TEXT>
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<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-03-18</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001738699</issuerCik>
        <issuerName>Wisekey International Holding S.A.</issuerName>
        <issuerTradingSymbol>WKEY</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002121811</rptOwnerCik>
            <rptOwnerName>Levinger David</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O WISEKEY INTERNATIONAL HOLDING S.A.</rptOwnerStreet1>
            <rptOwnerStreet2>AVENUE LOUIS-CASAI 58</rptOwnerStreet2>
            <rptOwnerCity>COINTRIN</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>V8</rptOwnerCountry>
            <rptOwnerZipCode>1216</rptOwnerZipCode>
            <rptOwnerStateDescription>SWITZERLAND</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>BDM WISeSat</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>/s/ John O'Hara, Attorney-in-Fact</signatureName>
        <signatureDate>2026-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
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<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>ex24-03182026_040350.htm
<TEXT>
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     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="text-align: right; margin: 0"><B>Exhibit 24</B></P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><U>POWER OF ATTORNEY</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The undersigned hereby makes, constitutes and
appoints each of John O&rsquo;Hara, David Briffod, Ang&eacute;lique Faoro, Soraya Ndam Sayve and Nathalie Verjus, or either of them acting
singly, and with full power of substitution, re-substitution and delegation, the undersigned&rsquo;s true and lawful attorney-in-fact
(each of such persons and their substitutes and delegees being referred to herein as the &quot;<U>Attorney-in-Fact</U>&quot;), with full
power to act for the undersigned and in the undersigned's name, place and stead, in the undersigned&rsquo;s capacity as an officer, director
or stockholder of WISeKey International Holding S.A. (the &ldquo;<U>Company</U>&rdquo;), to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-size: 10pt">1)</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">Take such actions as may be necessary or appropriate to </FONT>enable the
undersigned to submit and file forms, schedules and other documents with the U.S. Securities and Exchange Commission (&ldquo;<U>SEC</U>&rdquo;)
utilizing the SEC&rsquo;s Electronic Data Gathering and Retrieval (&ldquo;<U>EDGAR</U>&rdquo;) system, which actions may include (a)&nbsp;enrolling
the undersigned in EDGAR Next and (b)&nbsp;preparing, executing and submitting to the SEC a Form&nbsp;ID, amendments thereto, and such
other documents and information as may be necessary or appropriate to obtain codes and passwords enabling the undersigned to make filings
and submissions utilizing the EDGAR system;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">2)</TD><TD STYLE="text-align: justify">Prepare and execute any and all forms, schedules and other documents (including any amendments thereto)
the undersigned is required to file with the SEC, or which the Attorney-in-Fact considers it advisable for the undersigned to file with
the SEC, under Section&nbsp;13 or Section&nbsp;16 of the Securities Exchange Act of 1934 or any rule&nbsp;or regulation thereunder, or
under Rule&nbsp;144 under the Securities Act of 1933 (&ldquo;<U>Rule&nbsp;144</U>&rdquo;), including Forms 3, 4 and 5, Schedules 13D and
13G, and Forms 144 (all such forms, schedules and other documents being referred to herein as &ldquo;SEC Filings&rdquo;);</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">3)</TD><TD STYLE="text-align: justify">Submit and file SEC Filings with the SEC utilizing the EDGAR system or cause them to be submitted and
filed by a person appointed under <U>Section&nbsp;5</U> below;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">4)</TD><TD STYLE="text-align: justify">File, submit or otherwise deliver SEC Filings to any securities exchange on which the Company&rsquo;s
securities may be listed or traded;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-size: 10pt">5)</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">Act as an account administrator for the undersigned&rsquo;s EDGAR account,
including: </FONT>(i)&nbsp;appoint, remove and replace account administrators, account users, technical administrators and delegated entities;
(ii)&nbsp;maintain the security of the undersigned&rsquo;s EDGAR account, including modification of access codes; (iii)&nbsp;maintain,
modify and certify the accuracy of information on the undersigned&rsquo;s EDGAR account dashboard; (iv)&nbsp;act as the EDGAR point of
contact with respect to the undersigned&rsquo;s EDGAR account; and (v)&nbsp;any other actions contemplated by Rule&nbsp;10 of Regulation
S-T with respect to account administrators;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-size: 10pt">6)</FONT></TD><TD STYLE="text-align: justify">Cause the Company to accept a delegation of authority from any of the undersigned&rsquo;s EDGAR account
administrators and, pursuant to that delegation, authorize the Company&rsquo;s EDGAR account administrators to appoint, remove or replace
users for the undersigned&rsquo;s EDGAR account; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font-size: 10pt"><TR STYLE="vertical-align: top; text-align: left"><TD STYLE="text-align: right; width: 100%"><!-- Field: Sequence; Type: Arabic; Name: PageNo -->2<!-- Field: /Sequence --></TD></TR></TABLE></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">7)</TD><TD STYLE="text-align: justify">Obtain, as the undersigned's representative and on the undersigned's behalf, information regarding transactions
in the Company's equity securities from any third party, including the Company and any brokers, dealers, employee benefit plan administrators
and trustees, and the undersigned hereby authorizes any such third party to release any such information to the Attorney-in-Fact.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">The undersigned acknowledges
that:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">a)</TD><TD STYLE="text-align: justify">This Power of Attorney authorizes, but does not require, the Attorney-in-Fact to act in his or her discretion
on information provided to such Attorney-in-Fact without independent verification of such information;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">b)</TD><TD STYLE="text-align: justify">Any documents prepared or executed by the Attorney-in-Fact on behalf of the undersigned pursuant to this
Power of Attorney will be in such form and will contain ssssuch information as the Attorney-in-Fact, in his or her discretion, deems necessary
or desirable;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">c)</TD><TD STYLE="text-align: justify">Neither the Company nor the Attorney-in-Fact assumes any liability for the undersigned's responsibility
to comply with the requirements of Section&nbsp;13 or Section&nbsp;16 of the Exchange Act or Rule&nbsp;144, any liability of the undersigned
for any failure to comply with such requirements, or any liability of the undersigned for disgorgement of profits under Section&nbsp;16(b)&nbsp;of
the Exchange Act; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">d)</TD><TD STYLE="text-align: justify">This Power of Attorney does not relieve the undersigned from responsibility for compliance with the undersigned's
obligations under Section&nbsp;13 or Section&nbsp;16 of the Exchange Act, including, without limitation, the reporting requirements under
Section&nbsp;13 or Section&nbsp;16 of the Exchange Act.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">The undersigned hereby grants
to the Attorney-in-Fact full power and authority to do and perform each and every act and thing requisite, necessary or advisable to be
done in connection with the foregoing, as fully, to all intents and purposes, as the undersigned might or could do in person, hereby ratifying
and confirming all that the Attorney-in-Fact, or his or her substitute or substitutes, shall lawfully do or cause to be done by authority
of this Power of Attorney.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">This Power of Attorney shall
remain in full force and effect until the undersigned is no longer required to file Forms 4 or 5 or Schedules 13D or 13G or Forms 144
with respect to the undersigned's holdings of and transactions in securities of the Company, unless earlier revoked by the undersigned
in a signed writing delivered to the Attorney-in-Fact. This Power of Attorney revokes all previous powers of attorney with respect to
the subject matter of this Power of Attorney.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">IN WITNESS WHEREOF, the undersigned
has executed this Power of Attorney as of February&nbsp;13, 2026</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 50%"></TD><TD STYLE="border-bottom: Black 1pt solid; text-align: justify; width: 50%">/s/ David Levinger</TD>
</TR>
<TR STYLE="vertical-align: top; text-align: justify">
<TD></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt"><B>Name</B></FONT>: David Levinger</TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="margin: 0"></P>

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<P STYLE="margin: 0">&nbsp;</P>

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