<SEC-DOCUMENT>0001213900-25-005491.txt : 20250122
<SEC-HEADER>0001213900-25-005491.hdr.sgml : 20250122
<ACCEPTANCE-DATETIME>20250122161512
ACCESSION NUMBER:		0001213900-25-005491
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241220
FILED AS OF DATE:		20250122
DATE AS OF CHANGE:		20250122

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Bruhlmann Christian
		CENTRAL INDEX KEY:			0002006197
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-41294
		FILM NUMBER:		25546142

	MAIL ADDRESS:	
		STREET 1:		C/O ONCONETIX, INC.
		STREET 2:		201 E. FIFTH STREET, SUITE 1900
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45202

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Onconetix, Inc.
		CENTRAL INDEX KEY:			0001782107
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		201 E. FIFTH STREET
		STREET 2:		SUITE 1900
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45202
		BUSINESS PHONE:		513-620-4101

	MAIL ADDRESS:	
		STREET 1:		201 E. FIFTH STREET
		STREET 2:		SUITE 1900
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45202

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Blue Water Biotech, Inc.
		DATE OF NAME CHANGE:	20230424

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Blue Water Vaccines Inc.
		DATE OF NAME CHANGE:	20190710
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>ownership.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-12-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001782107</issuerCik>
        <issuerName>Onconetix, Inc.</issuerName>
        <issuerTradingSymbol>ONCO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002006197</rptOwnerCik>
            <rptOwnerName>Bruhlmann Christian</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ONCONETIX, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>201 E. FIFTH STREET, SUITE 1900</rptOwnerStreet2>
            <rptOwnerCity>CINCINNATI</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>45202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Strategy Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-12-20</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>177462</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>611372</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of Common Stock of the Issuer issuable upon settlement of Restricted Stock Units.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Christian Bruhlmann</signatureName>
        <signatureDate>2025-01-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
