<SEC-DOCUMENT>0000919574-25-007295.txt : 20251209
<SEC-HEADER>0000919574-25-007295.hdr.sgml : 20251209
<ACCEPTANCE-DATETIME>20251209093526
ACCESSION NUMBER:		0000919574-25-007295
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251209
DATE AS OF CHANGE:		20251209

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
		EIN:				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:		251557808

	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:			Stockbridge Partners LLC
		CENTRAL INDEX KEY:			0001505183
		ORGANIZATION NAME:           	
		EIN:				208051585
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144

	BUSINESS ADDRESS:	
		STREET 1:		200 CLARENDON STREET
		STREET 2:		35TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617 227-0050

	MAIL ADDRESS:	
		STREET 1:		200 CLARENDON STREET
		STREET 2:		35TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Stockbridge Partners LLC (D/B/A Stockbridge Investors)
		DATE OF NAME CHANGE:	20120313

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Stockbridge Partners LLC
		DATE OF NAME CHANGE:	20101108
</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:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <!-- Field: Pseudo-Tag; ID: Name; Data: Stockbridge Partners LLC -->
          <cik>0001505183</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>
        <com:street1>1350 Euclid Avenue, Suite 1600</com:street1>
        <com:city>Cleveland</com:city>
        <com:stateOrCountry>OH</com:stateOrCountry>
        <com:zipCode>44115</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>216-706-2960</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Stockbridge Partners LLC</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>May be deemed affiliate</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Goldman, Sachs &amp; Co.</name>
        <address>
          <com:street1>200 West Street</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10282-2198</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>100000</noOfUnitsSold>
      <aggregateMarketValue>134717000.00</aggregateMarketValue>
      <noOfUnitsOutstanding>56318584</noOfUnitsOutstanding>
      <approxSaleDate>12/09/2025</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <acquiredDate>12/06/2010</acquiredDate>
      <natureOfAcquisitionTransaction>Open market purchases</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Open market purchases</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>100000</amountOfSecuritiesAcquired>
      <paymentDate>12/06/2010</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Stockbridge Partners LLC</name>
        <address>
          <com:street1>200 Clarendon Street</com:street1>
          <com:street2>35th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02116</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>09/12/2025</saleDate>
      <amountOfSecuritiesSold>5000</amountOfSecuritiesSold>
      <grossProceeds>6384923.50</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>Stockbridge Partners LLC is deemed to be the beneficial owner of the Common Stock held through a separate managed account and through Stockbridge Fund, L.P. Regarding the "Securities To Be Sold" Table, the dates of acquisition and payment of the Common Stock varied, commencing on the date reported in the Table. Stockbridge Partners LLC is signing this form on behalf of the separate managed account and Stockbridge Fund, L.P.</remarks>
    <noticeSignature>
      <noticeDate>12/09/2025</noticeDate>
      <signature>STOCKBRIDGE PARTNERS LLC, By: BPSP, L.P., its Managing Member, By: Berkshire Partners Holdings LLC, its General Partner, Kenneth S. Bring, its M.D.</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
