<SEC-DOCUMENT>0001950047-25-000903.txt : 20250214
<SEC-HEADER>0001950047-25-000903.hdr.sgml : 20250214
<ACCEPTANCE-DATETIME>20250214174236
ACCESSION NUMBER:		0001950047-25-000903
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250214
DATE AS OF CHANGE:		20250214

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TransDigm Group INC
		CENTRAL INDEX KEY:			0001260221
		STANDARD INDUSTRIAL CLASSIFICATION:	AIRCRAFT PART & AUXILIARY EQUIPMENT, NEC [3728]
		ORGANIZATION NAME:           	04 Manufacturing
		IRS NUMBER:				510484716
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-32833
		FILM NUMBER:		25631378

	BUSINESS ADDRESS:	
		STREET 1:		1350 EUCLID AVENUE
		STREET 2:		SUITE 1600
		CITY:			CLEVELAND
		STATE:			OH
		ZIP:			44115
		BUSINESS PHONE:		216 706 2960

	MAIL ADDRESS:	
		STREET 1:		1350 EUCLID AVENUE
		STREET 2:		SUITE 1600
		CITY:			CLEVELAND
		STATE:			OH
		ZIP:			44115

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TD HOLDING CORP
		DATE OF NAME CHANGE:	20030818

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SMALL ROBERT J
		CENTRAL INDEX KEY:			0001234544
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001234544</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001260221</issuerCik>
            <issuerName>TRANSDIGM GROUP INC.</issuerName>
            <secFileNumber>001-32833</secFileNumber>
            <issuerAddress>
                <ns2:street1>1350 Euclid Avenue, Suite 1600</ns2:street1>
                <ns2:city>Cleveland</ns2:city>
                <ns2:stateOrCountry>OH</ns2:stateOrCountry>
                <ns2:zipCode>44115</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(216) 706-2960</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>ROBERT SMALL</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>3650</noOfUnitsSold>
            <aggregateMarketValue>4826007.74</aggregateMarketValue>
            <noOfUnitsOutstanding>56084587</noOfUnitsOutstanding>
            <approxSaleDate>02/14/2025</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/14/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of options under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3650</amountOfSecuritiesAcquired>
            <paymentDate>02/14/2025</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>Stockbridge Partners LLC</name>
                <address>
                    <ns2:street1>1350 Euclid Avenue, Suite 1600</ns2:street1>
                    <ns2:city>Cleveland</ns2:city>
                    <ns2:stateOrCountry>OH</ns2:stateOrCountry>
                    <ns2:zipCode>44115</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>12/12/2024</saleDate>
            <amountOfSecuritiesSold>38053</amountOfSecuritiesSold>
            <grossProceeds>47519855.78</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>02/14/2025</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Robert Small</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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</TEXT>
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</SEC-DOCUMENT>
