[Form 4] TransDigm Group INC Insider Trading Activity

Rhea-AI Filing Summary

TransDigm Group (TDG) director Form 4 shows an option exercise and matching share sale by an affiliated trust. On 11/21/2025, the Fortuna Trust dated June 1, 2018 exercised 230 stock options for TransDigm common stock at an exercise price of $105.88 per share and acquired 230 shares. The trust then sold 230 common shares at an average price of $1,360.3096 per share, leaving it with 8,158 shares of indirect beneficial ownership. Following the transaction, the trust continues to hold 64,275 stock options indirectly, with an exercise price of $105.88 and an expiration date of 04/25/2028.

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^*

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)
11/21/2025

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	11/21/2025		M		230	A	$105.88(1)	8,388	I	Fortuna Trust dated June 1, 2018
Common Stock	11/21/2025		S		230	D	$1,360.3096(2)	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	11/21/2025		M			230	09/30/2018	04/25/2028	Common Stock	230	$0	64,275	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.

	/s/ Lisa Tortora French as attorney in-fact for Kevin Stein	11/24/2025
	** 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 Group (TDG) report on this Form 4?

The filing reports that an affiliated trust of a TransDigm Group (TDG) director exercised 230 stock options and sold 230 common shares of the company on 11/21/2025.

At what prices were the TransDigm (TDG) option exercise and share sale executed?

The stock options were exercised at an exercise price of $105.88 per share, and the 230 common shares were sold at an average weighted price of $1,360.3096 per share, within a range of $1,360.0000–$1,360.9999.

How many TransDigm (TDG) shares does the reporting person still beneficially own after the transaction?

After the reported sale, the Fortuna Trust dated June 1, 2018 is shown as indirectly holding 8,158 shares of TransDigm common stock.

How many TransDigm (TDG) stock options remain after this Form 4 transaction?

Following the transaction, the trust is reported as indirectly holding 64,275 stock options for TransDigm common stock, each with an exercise price of $105.88 and an expiration date of 04/25/2028.

What is the relationship of the reporting person to TransDigm Group (TDG)?

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

How is the average sale price of the TransDigm (TDG) shares described?

The sale price is described as an average weighted price of $1,360.3096 per share for the 230 shares sold, with individual sale prices ranging from $1,360.0000 to $1,360.9999.