TransDigm (NYSE: TDG) director logs option exercise and share sale

Rhea-AI Filing Summary

TransDigm Group director Kevin M. Stein, through Fortuna Trust dated June 1, 2018, reported linked option and share transactions dated January 14, 2026. The trust exercised 7,627 stock options for TransDigm common stock at an exercise price of $342.31 per share, receiving 7,627 shares.

The trust then sold TransDigm common shares in three weighted-average blocks: 2,141 shares at $1,405.6379, 3,964 shares at $1,406.4099, and 1,522 shares at $1,407.3422. After these trades, the trust held 8,158 TransDigm common shares and 43,000 stock options indirectly for the reporting person.

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

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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)
01/14/2026

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	01/14/2026		M		7,627	A	$342.31(1)	15,785	I	Fortuna Trust dated June 1, 2018
Common Stock	01/14/2026		S		2,141	D	$1,405.6379(2)	13,644	I	Fortuna Trust dated June 1, 2018
Common Stock	01/14/2026		S		3,964	D	$1,406.4099(3)	9,680	I	Fortuna Trust dated June 1, 2018
Common Stock	01/14/2026		S		1,522	D	$1,407.3422(4)	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.	$342.31(1)	01/14/2026		M			7,627	09/30/2025	11/11/2030	Common Stock	7,627	$0	43,000	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 $1,405.0000 - $1,405.9700. 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 $1,406.0000 - $1,406.9900. 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 $1,407.0100 - $1,408.0000. 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 Quinlan as attorney in fact for Kevin Stein	01/16/2026
	** 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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FAQ

Who is the insider in this TransDigm Group (TDG) Form 4 filing?

The reporting person is Kevin M. Stein, identified as a director of TransDigm Group Inc. The reported holdings and transactions are shown as held indirectly through Fortuna Trust dated June 1, 2018.

What stock option transaction did TDG report for Kevin Stein on January 14, 2026?

On January 14, 2026, Fortuna Trust dated June 1, 2018 exercised 7,627 TransDigm stock options at an exercise price of $342.31 per share, resulting in 7,627 shares of common stock.

What TransDigm (TDG) share sales were disclosed in this Form 4?

The trust reported three sales of TransDigm common stock on January 14, 2026: 2,141 shares at a weighted-average price of $1,405.6379, 3,964 shares at $1,406.4099, and 1,522 shares at $1,407.3422.

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

Following the reported transactions, Fortuna Trust dated June 1, 2018 is shown as holding 8,158 shares of TransDigm common stock indirectly for the reporting person.

How many TransDigm stock options remain held after the reported Form 4 activity?

After the stock option exercise reported on January 14, 2026, 43,000 TransDigm stock options remain beneficially owned indirectly through Fortuna Trust dated June 1, 2018.

How were the sale prices in this TDG Form 4 calculated?

For each sale block, the filing states that the reported sale price is a weighted-average price. Shares in each block were sold at varying prices within disclosed ranges around the reported averages.