[Form 4] TransDigm Group INC Insider Trading Activity

Rhea-AI Filing Summary

TransDigm Group Inc. (TDG) director Kevin Stein reported an option exercise and related share sales on 11/18/2025, all held indirectly through the Fortuna Trust dated June 1, 2018. A stock option for 7,191 shares of common stock was exercised at an adjusted price of $105.88 per share.

The shares acquired on exercise were then sold in multiple open-market transactions the same day, using weighted-average prices, with example sales including 3,580 shares at $1,360.2775 and 1,531 shares at $1,362.6356. The filing notes that the exercise price has been adjusted for dividends declared since August 1, 2022. After these transactions, the trust beneficially owns 8,158 shares of TransDigm common stock and 65,609 stock options.

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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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).

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^*

Stein Kevin M

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
11/18/2025

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	11/18/2025		M		7,191	A	$105.88(1)	15,349	I	Fortuna Trust dated June 1, 2018
Common Stock	11/18/2025		S		3,580	D	$1,360.2775(2)	11,769	I	Fortuna Trust dated June 1, 2018
Common Stock	11/18/2025		S		848	D	$1,361.8949(3)	10,921	I	Fortuna Trust dated June 1, 2018
Common Stock	11/18/2025		S		1,531	D	$1,362.6356(4)	9,390	I	Fortuna Trust dated June 1, 2018
Common Stock	11/18/2025		S		1,162	D	$1,363.7275(5)	8,228	I	Fortuna Trust dated June 1, 2018
Common Stock	11/18/2025		S		70	D	$1,364.585(6)	8,158	I	Fortuna Trust dated June 1, 2018

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	$105.88	11/18/2025		M			7,191	09/30/2018	04/25/2028	Common Stock	7,191	$0	65,609	I	Fortuna Trust dated June 1, 2018

Explanation of Responses:

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 $1,360.0000- $1,360.9999. 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 $1,361.2300- $1,362.2299. 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 $1,362.2400- $1,363.2399. 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 $1,363.2600- $1,364.2599. 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 $1,364.5850- $1,365.5849. 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/ Lisa Tortora French as attorney in-fact for Kevin Stein	11/19/2025
	** 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 insider transaction did TransDigm (TDG) report in this Form 4?

The Form 4 reports that director Kevin Stein, through the Fortuna Trust dated June 1, 2018, exercised a stock option for 7,191 shares of TransDigm common stock at an exercise price of $105.88 per share on 11/18/2025, followed by multiple open-market sales of the acquired shares.

At what prices were TransDigm (TDG) shares sold by the reporting person?

The shares were sold on 11/18/2025 in several transactions using weighted-average prices, including 3,580 shares at $1,360.2775, 848 shares at $1,361.8949, 1,531 shares at $1,362.6356, 1,162 shares at $1,363.7275, and 70 shares at $1,364.585. The price ranges disclosed run from $1,360.0000 to $1,365.5849 per share.

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

After the reported transactions on 11/18/2025, the reporting person, through the Fortuna Trust dated June 1, 2018, beneficially owns 8,158 shares of TransDigm common stock.

What derivative securities related to TransDigm (TDG) does the insider still hold?

The filing shows that following the exercise of the stock option for 7,191 shares, the reporting person continues to hold 65,609 stock options indirectly through the Fortuna Trust dated June 1, 2018. These options have an exercise price of $105.88 per share and an expiration date of 04/25/2028.

Why was the TransDigm (TDG) stock option exercise price adjusted?

The explanation notes that the $105.88 exercise price of the stock option has been adjusted to reflect dividends declared since August 1, 2022. This adjustment aligns the option terms with dividend distributions made after that date.

How is the TransDigm (TDG) insider’s ownership held according to the Form 4?

All reported holdings and transactions are indicated as indirect, with ownership held through the Fortuna Trust dated June 1, 2018. The reporting person is identified as a director of TransDigm Group Inc.