Director’s trust trims TransDigm Group (TDG) stake with multiple sales

Rhea-AI Filing Summary

TransDigm Group director Kevin M. Stein, through Fortuna Trust dated June 1, 2018, reported a series of open-market sales of TransDigm common stock on February 2, 2026. The trust sold multiple blocks of shares at average prices ranging from $1,431.4599 to $1,440.4800 per share.

Individual transactions included sales such as 3,093 shares at an average price of $1,433.4578 and 1,497 shares at $1,436.4265. Following these sales, Fortuna Trust was reported as indirectly holding 8,158 TransDigm common shares.

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)
02/02/2026

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	02/02/2026		S		1,421	D	$1,431.4599(1)	17,812	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		1,364	D	$1,432.5282(2)	16,448	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		3,093	D	$1,433.4578(3)	13,355	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		1,462	D	$1,434.6305(4)	11,893	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		810	D	$1,435.6275(5)	11,083	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		1,497	D	$1,436.4265(6)	9,586	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		428	D	$1,437.3994(7)	9,158	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		270	D	$1,438.9134(8)	8,888	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		720	D	$1,439.5622(9)	8,168	I	Fortuna Trust dated June 1, 2018
Common Stock	02/02/2026		S		10	D	$1,440.48	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

Explanation of Responses:

1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,431.0500 - $1,431.9900. 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.

2. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,432.1000 - $1,432.9400. 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.

3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,433.1200 - $1,434.0800. 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 $1,434.1400 - $1,435.1200. 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 $1,435.1400 - $1,436.1350. 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 $1,436.1400 - $1,437.0900. 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 $1,437.1800 - $1,438.0400. 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.

8. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,438.1800 - $1,439.1400. 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 $1,439.2000 - $1,440.1700. 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.

Remarks:

Due to a 30-line item limitation in Table 1, this is the second of two Form 4s filed by the reporting person for this transaction.

	/s/ Rachel Quinlan as attorney in fact for Kevin Stein	02/03/2026
	** 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).
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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 transaction did TransDigm Group (TDG) report for Kevin M. Stein?

TransDigm Group reported that director Kevin M. Stein, through Fortuna Trust dated June 1, 2018, executed multiple open-market sales of TransDigm common stock on February 2, 2026. Each sale was reported separately with its own share count and average price.

How many TransDigm (TDG) shares does the Fortuna Trust hold after the reported sales?

After the reported series of sales, Fortuna Trust dated June 1, 2018 was shown as indirectly holding 8,158 shares of TransDigm common stock. This figure comes from the final line of the Form 4’s non-derivative securities table.

On what date were the TransDigm (TDG) insider share sales executed?

All the reported insider share sales were executed on February 2, 2026. The Form 4 lists this single transaction date for each block of TransDigm common stock sold by Fortuna Trust associated with director Kevin M. Stein.

At what prices were the TransDigm (TDG) shares sold in Kevin M. Stein’s Form 4?

The reported sales used average weighted prices, with transactions ranging from $1,431.4599 to $1,440.4800 per share. Footnotes clarify that actual trades occurred within narrow price bands around each reported average for the separate sale blocks.

Who actually held the TransDigm (TDG) shares sold in this insider transaction?

The shares were held indirectly through Fortuna Trust dated June 1, 2018. The Form 4 identifies ownership as indirect, with the nature of ownership specified as the Fortuna Trust, which is associated with director Kevin M. Stein.

Did the TransDigm (TDG) Form 4 include any derivative securities for Kevin M. Stein?

The filing’s Table II for derivative securities shows no reported derivative transactions. All disclosed activity involved non-derivative TransDigm common stock sales indirectly held through Fortuna Trust dated June 1, 2018.