<SEC-DOCUMENT>0001213900-25-060611.txt : 20250701
<SEC-HEADER>0001213900-25-060611.hdr.sgml : 20250701
<ACCEPTANCE-DATETIME>20250701210116
ACCESSION NUMBER:		0001213900-25-060611
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250701
FILED AS OF DATE:		20250701
DATE AS OF CHANGE:		20250701

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			1RT Acquisition Sponsor LLC
		CENTRAL INDEX KEY:			0002054339
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42731
		FILM NUMBER:		251098117

	BUSINESS ADDRESS:	
		STREET 1:		205 WEST 28TH STREET, 2ND FLOOR SUITE C
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10001
		BUSINESS PHONE:		347-526-2969

	MAIL ADDRESS:	
		STREET 1:		205 WEST 28TH STREET, 2ND FLOOR SUITE C
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10001

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			1RT Acquisition Corp.
		CENTRAL INDEX KEY:			0002054272
		STANDARD INDUSTRIAL CLASSIFICATION:	BLANK CHECKS [6770]
		ORGANIZATION NAME:           	05 Real Estate & Construction
		EIN:				000000000
		STATE OF INCORPORATION:			E9

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX 309, UGLAND HOUSE
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-1104
		BUSINESS PHONE:		347-526-2969

	MAIL ADDRESS:	
		STREET 1:		PO BOX 309, UGLAND HOUSE
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-1104
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>ownership.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-07-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0002054272</issuerCik>
        <issuerName>1RT Acquisition Corp.</issuerName>
        <issuerTradingSymbol>ONCH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002054339</rptOwnerCik>
            <rptOwnerName>1RT Acquisition Sponsor LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O 1RT ACQUISITION CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>205 WEST 28TH STREET, 2ND FLOOR SUITE C</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10001</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Ordinary Shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4312500</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">As described in the registration statement on Form S-1 (File No. 333-287941) of 1RT Acquisition Corp. (the &quot;Issuer&quot;) under the heading &quot;Description of Securities--Founder Shares,&quot; the shares of Class B ordinary shares will automatically convert into shares of Class A ordinary shares at the time of the Issuer's initial business combination, or at any time prior to the Issuer's initial business combination, at the option of the holder, on a one-for-one basis, subject to certain adjustments. The Class B ordinary shares have no expiration date.</footnote>
        <footnote id="F2">These shares represent the Class B ordinary shares held by 1RT Acquisition Sponsor LLC (the &quot;Sponsor&quot;) acquired pursuant to a subscription agreement by and between the Issuer and the Sponsor. The Class B ordinary shares include up to 562,50 shares that are subject to forfeiture in the event the underwriters of the Issuer's initial public offering do not exercise in full their over-allotment option as described in the Issuer's registration statement.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Daniel Tapiero, Managing Member of 1RT Acquisition Sponsor LLC</signatureName>
        <signatureDate>2025-07-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
