[Form 4] TransDigm Group INC Insider Trading Activity

Rhea-AI Filing Summary

TransDigm Group (TDG): insider transaction — Co‑Chief Operating Officer Joel Reiss exercised 3,000 stock options at $284.97 and, on the same day (10/20/2025), sold 3,000 common shares in multiple open‑market trades.

The reported sales were executed in tranches priced between $1,272.04 and $1,284.00, with several weighted‑average prices disclosed. Following these transactions, Mr. Reiss reported 3,600 common shares beneficially owned directly. He also reported 47,000 derivative securities (stock options) beneficially owned, with the exercised option series having an exercise price of $284.97, first exercisable on 09/30/2021 and expiring on 11/08/2027.

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

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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)
10/20/2025

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	10/20/2025		M		3,000	A	$284.97	6,600	D
Common Stock	10/20/2025		S		42	D	$1,272.5781(1)	6,558	D
Common Stock	10/20/2025		S		200	D	$1,273.3618(2)	6,358	D
Common Stock	10/20/2025		S		100	D	$1,275	6,258	D
Common Stock	10/20/2025		S		308	D	$1,276.4675(3)	5,950	D
Common Stock	10/20/2025		S		742	D	$1,278.0193(4)	5,208	D
Common Stock	10/20/2025		S		524	D	$1,280.4205(5)	4,684	D
Common Stock	10/20/2025		S		200	D	$1,281.07	4,484	D
Common Stock	10/20/2025		S		844	D	$1,283.3892(6)	3,640	D
Common Stock	10/20/2025		S		40	D	$1,283.99(7)	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	10/20/2025		M			3,000	09/30/2021	11/08/2027	Common Stock	3,000	$0	47,000	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 $1,272.0400 - $1,272.7400. 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 $1,273.2800 - $1,274.0600. 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 $1,276.4500 - $1,276.5000. 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 $1,277.5350 - $1,278.4800. 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 $1,280.3100 - $1,281.0100. 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 $1,282.9200 - $1,283.9100. 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 $1,283.9600 - $1,284.0000. 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/ Rachel L. Quinlan as attorney in fact for Joel Reiss	10/21/2025
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did TDG's Co-COO report on Form 4?

He exercised 3,000 stock options at $284.97 and sold 3,000 common shares on 10/20/2025.

What prices were the TDG share sales executed at?

The sales were reported at weighted‑average prices within $1,272.04–$1,284.00, with detailed tranches disclosed.

How many TDG shares does the reporting person own after the transactions?

He reported 3,600 common shares beneficially owned directly after the transactions.

What derivative holdings remain after the transaction?

He reported 47,000 derivative securities (stock options) beneficially owned following the transaction.

What are the key terms of the exercised TDG option?

Exercise price $284.97; first exercisable on 09/30/2021; expiration on 11/08/2027.

Were the TDG share sales split across multiple trades?

Yes. Tranches included quantities such as 42, 200, 100, 308, 742, 524, 200, 844, and 40 shares at disclosed prices.