[Form 4] TransDigm Group Incorporated Insider Trading Activity

Insider Trade Summary

Net Seller: 3,000 shares ($4,793,579)

Net Sell 15 txns

Insider Reiss Joel

Role Co-Chief Operating Officer

Sold 3,000 shs ($4.79M)

Type	Security	Shares	Price	Value
Exercise	Stock Option	3,000	$0.00	--
Exercise	Common Stock	3,000	$284.97	$855K
Sale	Common Stock	229	$1,586.1365	$363K
Sale	Common Stock	140	$1,586.78	$222K
Sale	Common Stock	134	$1,588.2312	$213K
Sale	Common Stock	200	$1,590.804	$318K
Sale	Common Stock	10	$1,592.18	$16K
Sale	Common Stock	348	$1,593.7074	$555K
Sale	Common Stock	300	$1,599.00	$480K
Sale	Common Stock	220	$1,600.6611	$352K
Sale	Common Stock	714	$1,601.3088	$1.14M
Sale	Common Stock	200	$1,603.19	$321K
Sale	Common Stock	200	$1,604.26	$321K
Sale	Common Stock	148	$1,605.6928	$238K
Sale	Common Stock	157	$1,607.49	$252K

Holdings After Transaction: Stock Option — 56,000 shares (Direct); Common Stock — 6,600 shares (Direct)

Footnotes (1)

1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1585.6450 - $1586.6200. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1588.0900 - $1588.5200. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1590.6100 - $1591.2700. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1593.4200 - $1593.7900. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1600.1500 - $1600.9600. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1601.0500 - $1601.7450. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1605.6750 - $1605.7300. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Reiss Joel

(Last) (First) (Middle)

1350 EUCLID AVE

SUITE 1600

(Street)

CLEVELAND OH 44115

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
TransDigm Group INC [ TDG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Co-Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
07/21/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/21/2025		M		3,000	A	$284.97	6,600	D
Common Stock	07/21/2025		S		229	D	$1,586.1365(1)	6,371	D
Common Stock	07/21/2025		S		140	D	$1,586.78	6,231	D
Common Stock	07/21/2025		S		134	D	$1,588.2312(2)	6,097	D
Common Stock	07/21/2025		S		200	D	$1,590.804(3)	5,897	D
Common Stock	07/21/2025		S		10	D	$1,592.18	5,887	D
Common Stock	07/21/2025		S		348	D	$1,593.7074(4)	5,539	D
Common Stock	07/21/2025		S		300	D	$1,599	5,239	D
Common Stock	07/21/2025		S		220	D	$1,600.6611(5)	5,019	D
Common Stock	07/21/2025		S		714	D	$1,601.3088(6)	4,305	D
Common Stock	07/21/2025		S		200	D	$1,603.19	4,105	D
Common Stock	07/21/2025		S		200	D	$1,604.26	3,905	D
Common Stock	07/21/2025		S		148	D	$1,605.6928(7)	3,757	D
Common Stock	07/21/2025		S		157	D	$1,607.49	3,600	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option	$284.97	07/21/2025		M			3,000	09/30/2021	11/08/2027	Common Stock	3,000	$0	56,000	D

Explanation of Responses:

1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1585.6450 - $1586.6200. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

2. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1588.0900 - $1588.5200. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1590.6100 - $1591.2700. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

4. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1593.4200 - $1593.7900. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

5. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1600.1500 - $1600.9600. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

6. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1601.0500 - $1601.7450. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

7. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1605.6750 - $1605.7300. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

	/s/ Gabrielle Feuer as attorney-in-fact	07/22/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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