[Form 4] TransDigm Group INC Insider Trading Activity

Rhea-AI Filing Summary

TransDigm Group Inc. (TDG) Co-Chief Operating Officer Joel Reiss reported an insider transaction involving company common stock. On 11/17/2025, he exercised a stock option to acquire 3,900 shares of TransDigm common stock at an exercise price of $284.97 per share and, on the same date, reported a series of open-market sales of common stock at average prices generally between about $1,326.16 and $1,353.92 per share. Following these transactions, he reported beneficial ownership of 3,600 shares of common stock held directly and 43,100 stock options held directly.

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
Estimated average burden
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^*

Reiss Joel

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Co-Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
11/17/2025

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	11/17/2025		M		3,900	A	$284.97	7,500	D
Common Stock	11/17/2025		S		10	D	$1,326.21(1)	7,490	D
Common Stock	11/17/2025		S		29	D	$1,329.0307(2)	7,461	D
Common Stock	11/17/2025		S		31	D	$1,330.3248(3)	7,430	D
Common Stock	11/17/2025		S		220	D	$1,331.5607(4)	7,210	D
Common Stock	11/17/2025		S		136	D	$1,332.6193(5)	7,074	D
Common Stock	11/17/2025		S		416	D	$1,333.7575(6)	6,658	D
Common Stock	11/17/2025		S		195	D	$1,334.7149(7)	6,463	D
Common Stock	11/17/2025		S		212	D	$1,335.4204(8)	6,251	D
Common Stock	11/17/2025		S		290	D	$1,336.9276(9)	5,961	D
Common Stock	11/17/2025		S		299	D	$1,338.3219(10)	5,662	D
Common Stock	11/17/2025		S		256	D	$1,339.1319(11)	5,406	D
Common Stock	11/17/2025		S		122	D	$1,340.275(12)	5,284	D
Common Stock	11/17/2025		S		233	D	$1,341.1672(13)	5,051	D
Common Stock	11/17/2025		S		200	D	$1,342.3491(14)	4,851	D
Common Stock	11/17/2025		S		224	D	$1,343.206(15)	4,627	D
Common Stock	11/17/2025		S		112	D	$1,344.5739(16)	4,515	D
Common Stock	11/17/2025		S		255	D	$1,345.6832(17)	4,260	D
Common Stock	11/17/2025		S		90	D	$1,346.721(18)	4,170	D
Common Stock	11/17/2025		S		129	D	$1,347.8005(19)	4,041	D
Common Stock	11/17/2025		S		108	D	$1,349.1058(20)	3,933	D
Common Stock	11/17/2025		S		110	D	$1,349.8017(21)	3,823	D
Common Stock	11/17/2025		S		73	D	$1,351.039(22)	3,750	D
Common Stock	11/17/2025		S		80	D	$1,352.0136(23)	3,670	D
Common Stock	11/17/2025		S		60	D	$1,353.0583(24)	3,610	D
Common Stock	11/17/2025		S		10	D	$1,353.92(25)	3,600	D

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	$284.97	11/17/2025		M			3,900	09/30/2021	11/08/2027	Common Stock	3,900	$0	43,100	D

Explanation of Responses:

1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,326.1600- $1,327.1599. 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 $1,328.6600- $1,329.6599. 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 $1,329.7500- $1,330.7499. 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 $1,331.1600- $1,332.1599. 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 $1,332.2300- $1,333.2299. 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.

6. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,333.2400- $1,334.2399. 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.

7. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,334.2800- $1,335.2799. 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 $1,335.2800- $1,336.2799. 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 $1,336.3300- $1,337.3299. 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 $1,337.7100- $1,338.7099. 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 $1,338.7300- $1,339.7299. 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 $1,339.7500- $1,340.7499. 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 $1,340.7600- $1,341.7599. 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 $1,341.7800- $1,342.7799. 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 $1,342.8800- $1,343.8799. 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 $1,344.0800- $1,345.0799. 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 $1,345.3100- $1,346.3099. 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 $1,346.4200- $1,347.4199. 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 $1,347.4500- $1,348.4499. 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 $1,348.4600- $1,349.4599. 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.

21. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,349.4600- $1,350.4599. 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.

22. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,350.4700- $1,351.4699. 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.

23. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,351.5100- $1,352.5099. 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.

24. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,352.8600- $1,353.8599. 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.

25. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,353.9200- $1,354.9199. 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 Joel Reiss	11/18/2025
	** 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) disclose in this Form 4?

The filing reports that Co-Chief Operating Officer Joel Reiss exercised a stock option for 3,900 shares of TransDigm Group common stock at an exercise price of $284.97 per share on 11/17/2025, and on the same date reported multiple open-market sales of common stock at various prices.

At what prices did the TransDigm (TDG) insider sell shares in this Form 4?

The reported sales of TransDigm common stock on 11/17/2025 were executed in numerous small transactions, with average weighted prices disclosed in ranges, including $1,326.1600–$1,327.1599 up to $1,353.9200–$1,354.9199 per share, as detailed in the explanation of responses.

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

After the reported transactions on 11/17/2025, the reporting person disclosed beneficial ownership of 3,600 shares of TransDigm common stock held directly, as shown in Table I of the filing.

What stock options related to TransDigm (TDG) are reported in this Form 4?

Table II shows a stock option with an exercise price of $284.97 per share, exercisable beginning 09/30/2021 and expiring on 11/08/2027, covering 3,900 shares of common stock. Following the reported exercise, the reporting person lists 43,100 stock options beneficially owned directly.

What is the role of the person reporting this TransDigm (TDG) Form 4 transaction?

The reporting person is identified as an officer of TransDigm Group Inc., serving as Co-Chief Operating Officer, and is filing the Form 4 as a single reporting person.

Does the TransDigm (TDG) Form 4 explain how the average sale prices were calculated?

Yes. For each group of sales, the filing states that the reported price is an average weighted price for shares sold in a disclosed price range and notes that the reporting person undertakes, upon request, to provide full information on the number of shares sold at each separate price within that range.