TransDigm Group (NYSE: TDG) director reports option exercises and share sales

Rhea-AI Filing Summary

TransDigm Group Inc. director Kevin Stein, through the Fortuna Trust dated June 1, 2018, reported option exercises and share sales dated 01/05/2026. The trust exercised 17,940 stock options at an exercise price of $105.88 per share and another 7,060 options at $341.28 per share, both relating to TransDigm common stock.

On the same date, the trust sold multiple blocks of TransDigm common stock in open-market transactions at prices ranging from about $1,361.59 to $1,387.035 per share, reported as weighted average prices for each sale line. After these transactions, the trust indirectly held 8,158 shares of TransDigm common stock and 42,940 stock options, all reported as indirectly owned through the Fortuna Trust.

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

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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)
01/05/2026

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	01/05/2026		M		17,940	A	$105.88(1)	26,098	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		M		7,060	A	$341.28(1)	33,158	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		560	D	$1,361.59	32,598	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		20	D	$1,363.08	32,578	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		160	D	$1,364.5653(2)	32,418	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		255	D	$1,367.1848(3)	32,163	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		716	D	$1,368.1129(4)	31,447	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		3,956	D	$1,369.0453(5)	27,491	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		4,457	D	$1,370.1206(6)	23,034	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		1,777	D	$1,371.0914(7)	21,257	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		2,084	D	$1,372.0398(8)	19,173	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		481	D	$1,373.0119(9)	18,692	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		1,020	D	$1,374.2481(10)	17,672	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		1,338	D	$1,375.1611(11)	16,334	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		1,587	D	$1,376.1458(12)	14,747	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		403	D	$1,377.2956(13)	14,344	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		1,239	D	$1,378.5069(14)	13,105	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		1,218	D	$1,379.6401(15)	11,887	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		385	D	$1,380.5337(16)	11,502	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		903	D	$1,381.5268(17)	10,599	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		1,867	D	$1,382.6226(18)	8,732	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		274	D	$1,384.1186(19)	8,458	I	Fortuna Trust dated June 1, 2018
Common Stock	01/05/2026		S		300	D	$1,387.035(20)	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	01/05/2026		M			17,940	09/30/2018	04/25/2028	Common Stock	17,940	$0	20,000	I	Fortuna Trust dated June 1, 2018
Stock Option	$341.28	01/05/2026		M			7,060	09/30/2023	11/15/2029	Common Stock	7,060	$0	42,940	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 $1,364.4650 - $1,365.0000. 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.

3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,366.5600 - $1,367.4900. 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 $1,367.5700 - $1,368.5500. 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 $1,368.5800 - $1,369.5700. 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 $1,369.5800 - $1,370.5600. 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 $1,370.5800 - $1,371.5200. 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.

8. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,371.6300 - $1,372.6200. 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.

9. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,372.6300 - $1,373.5700. 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.

10. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,373.7400 - $1,374.7300. 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.

11. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,374.7750 - $1,375.7200. 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.

12. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,375.7900 - $1,376.7600. 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.

13. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,376.8600 - $1,377.7800. 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.

14. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,377.9500 - $1,378.9200. 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.

15. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,379.0000 - $1,379.9800. 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.

16. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,380.0000 - $1,380.9800. 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.

17. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,381.0200 - $1,381.9400. 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.

18. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,382.1600 - $1,383.0500. 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.

19. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,383.6400 - $1,384.4900. 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.

20. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,387.0300 - $1,387.0400. 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	01/06/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What insider transactions did TransDigm Group (TDG) report on January 5, 2026?

The filing shows that a director, through the Fortuna Trust dated June 1, 2018, exercised stock options for TransDigm Group common stock and sold multiple blocks of shares in the open market, all dated 01/05/2026.

How many TransDigm (TDG) stock options were exercised in this Form 4?

The trust exercised 17,940 stock options at an exercise price of $105.88 per share and 7,060 stock options at $341.28 per share, each convertible into TransDigm common stock.

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

The shares were sold in multiple transactions at weighted average prices, including $1,361.59, $1,363.08, and a series of prices generally between about $1,364.57 and $1,387.035 per share, with each line item reflecting a separate weighted average price.

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

Following the reported sales, the Fortuna Trust indirectly held 8,158 shares of TransDigm Group common stock.

What is the remaining stock option position reported for TransDigm (TDG)?

After the option exercises, the Form 4 reports 42,940 stock options beneficially owned indirectly through the Fortuna Trust dated June 1, 2018.

How is the weighted average sale price disclosed in this TransDigm (TDG) Form 4?

For each sale line, the price represents a weighted average price of shares sold within a stated price range, and the reporting person undertakes to provide full information on the number of shares sold at each separate price upon request.