Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Graff Michael 2. Issuer Name and Ticker or Trading Symbol TransDigm Group INC [TDG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 102 PRINCE STREET, FLOOR 5 3. Date of Earliest Transaction (Month/Day/Year) 08/26/2025 (Street) NEW YORK, NY 10012 4. If Amendment, Date 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 (City) (State) (Zip) 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 08/26/2025 M 1,760 A $156.47(1) 3,724 D Common Stock 08/26/2025 S 172 D $1,399.4357(2) 3,552 D Common Stock 08/26/2025 S 228 D $1,400.0324(3) 3,324 D Common Stock 08/26/2025 S 400 D $1,402.039(4) 2,924 D Common Stock 08/26/2025 S 800 D $1,402.8182(5) 2,124 D Common Stock 08/26/2025 S 160 D $1,404.4181(6) 1,964 D Common Stock 7,000 I By trusts(7) Common Stock 5,096 I By trust(8)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities (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 of Derivative Security: 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

$156.47(1)

08/26/2025

M

1,760

09/30/2018

11/08/2027

Common Stock

1,760

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Graff Michael 102 PRINCE STREET FLOOR 5 NEW YORK, NY 10012	X

Signatures

/s/ Gabrielle Feuer as attorney-in-fact		08/27/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The exercise price has been adjusted for dividends declared since August 1, 2022.
(2)	Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,398.79 - $1,399.64. 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 $1,399.89 - $1,400.11. 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 $1,401.56 - $1,402.36. 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 $1,402.58 - $1,403.11. 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 $1,404.4150 - $1,404.42. 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)	These shares are held by certain trusts created for the benefit of the reporting person's children and for which the reporting person is trustee.
(8)	The shares reported in Column Five are held by The 2012 Carol Ostrow GST Trust created by the reporting person's spouse for the benefit of their children.

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