[Form 4] TransDigm Group INC Insider Trading Activity

Rhea-AI Filing Summary

TransDigm Group Inc.’s Co-Chief Operating Officer reported an option exercise and related stock sales. On 12/15/2025, he exercised 3,900 stock options at an exercise price of $284.97 per share and received the same number of TransDigm common shares. The filing then shows multiple open-market sales of TransDigm common stock that day in small blocks at weighted-average prices within ranges from about $1,282.12 to $1,311.40. After these transactions, he directly beneficially owned 3,600 shares of common stock and held 39,200 stock options that remain outstanding.

Insider Trade Summary

Net Seller: 3,900 shares ($5,033,033)

Net Sell 28 txns

Insider Reiss Joel

Role Co-Chief Operating Officer

Sold 3,900 shs ($5.03M)

Type	Security	Shares	Price	Value
Exercise	Stock Option	3,900	$0.00	--
Exercise	Common Stock	3,900	$284.97	$1.11M
Sale	Common Stock	80	$1,282.7296	$103K
Sale	Common Stock	280	$1,283.702	$359K
Sale	Common Stock	220	$1,284.7756	$283K
Sale	Common Stock	220	$1,285.64	$283K
Sale	Common Stock	262	$1,286.6977	$337K
Sale	Common Stock	336	$1,287.6938	$433K
Sale	Common Stock	536	$1,288.5358	$691K
Sale	Common Stock	420	$1,289.8069	$542K
Sale	Common Stock	220	$1,290.681	$284K
Sale	Common Stock	418	$1,291.6778	$540K
Sale	Common Stock	279	$1,292.6582	$361K
Sale	Common Stock	61	$1,293.7603	$79K
Sale	Common Stock	50	$1,294.897	$65K
Sale	Common Stock	58	$1,296.1028	$75K
Sale	Common Stock	32	$1,297.3191	$42K
Sale	Common Stock	44	$1,298.1073	$57K
Sale	Common Stock	12	$1,299.035	$16K
Sale	Common Stock	25	$1,300.44	$33K
Sale	Common Stock	14	$1,301.7814	$18K
Sale	Common Stock	45	$1,303.1456	$59K
Sale	Common Stock	60	$1,304.9026	$78K
Sale	Common Stock	118	$1,305.9847	$154K
Sale	Common Stock	20	$1,306.64	$26K
Sale	Common Stock	40	$1,307.945	$52K
Sale	Common Stock	20	$1,309.34	$26K
Sale	Common Stock	30	$1,311.2467	$39K

Holdings After Transaction: Stock Option — 39,200 shares (Direct); Common Stock — 7,500 shares (Direct)

Footnotes (1)

1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,282.1200 - $1,283.1000. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,283.1700 - $1,284.1000. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,284.1700 - $1,285.1000. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,285.1700 - $1,286.0500. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,286.1700 - $1,287.1600. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,287.1700 - $1,288.1500. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,288.1800 - $1,289.0500. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,289.2000 - $1,290.1900. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,290.2000 - $1,291.1300. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,291.2300 - $1,292.2200. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,292.2400 - $1,293.2300. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,293.2600 - $1,294.1500. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,294.2900 - $1,295.2000. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,295.5300 - $1,296.3600. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,296.8000 - $1,297.6500. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,297.8400 - $1,298.8300. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,298.9200 - $1,299.6200. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,300.2500 - $1,301.1000. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,301.5200 - $1,302.1200. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,302.7200 - $1,303.5000. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,304.3200 - $1,305.1500. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,305.5200 - $1,306.3400. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,307.8300 - $1,308.1900. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,311.1700 - $1,311.4000. 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.

Form 4 Insider Transactions: What Each Field Means →

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)
12/15/2025

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	12/15/2025		M		3,900	A	$284.97	7,500	D
Common Stock	12/15/2025		S		80	D	$1,282.7296(1)	7,420	D
Common Stock	12/15/2025		S		280	D	$1,283.702(2)	7,140	D
Common Stock	12/15/2025		S		220	D	$1,284.7756(3)	6,920	D
Common Stock	12/15/2025		S		220	D	$1,285.64(4)	6,700	D
Common Stock	12/15/2025		S		262	D	$1,286.6977(5)	6,438	D
Common Stock	12/15/2025		S		336	D	$1,287.6938(6)	6,102	D
Common Stock	12/15/2025		S		536	D	$1,288.5358(7)	5,566	D
Common Stock	12/15/2025		S		420	D	$1,289.8069(8)	5,146	D
Common Stock	12/15/2025		S		220	D	$1,290.681(9)	4,926	D
Common Stock	12/15/2025		S		418	D	$1,291.6778(10)	4,508	D
Common Stock	12/15/2025		S		279	D	$1,292.6582(11)	4,229	D
Common Stock	12/15/2025		S		61	D	$1,293.7603(12)	4,168	D
Common Stock	12/15/2025		S		50	D	$1,294.897(13)	4,118	D
Common Stock	12/15/2025		S		58	D	$1,296.1028(14)	4,060	D
Common Stock	12/15/2025		S		32	D	$1,297.3191(15)	4,028	D
Common Stock	12/15/2025		S		44	D	$1,298.1073(16)	3,984	D
Common Stock	12/15/2025		S		12	D	$1,299.035(17)	3,972	D
Common Stock	12/15/2025		S		25	D	$1,300.44(18)	3,947	D
Common Stock	12/15/2025		S		14	D	$1,301.7814(19)	3,933	D
Common Stock	12/15/2025		S		45	D	$1,303.1456(20)	3,888	D
Common Stock	12/15/2025		S		60	D	$1,304.9026(21)	3,828	D
Common Stock	12/15/2025		S		118	D	$1,305.9847(22)	3,710	D
Common Stock	12/15/2025		S		20	D	$1,306.64	3,690	D
Common Stock	12/15/2025		S		40	D	$1,307.945(23)	3,650	D
Common Stock	12/15/2025		S		20	D	$1,309.34	3,630	D
Common Stock	12/15/2025		S		30	D	$1,311.2467(24)	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	12/15/2025		M			3,900	09/30/2021	11/08/2027	Common Stock	3,900	$0	39,200	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 $1,282.1200 - $1,283.1000. 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 $1,283.1700 - $1,284.1000. 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 $1,284.1700 - $1,285.1000. 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 $1,285.1700 - $1,286.0500. 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.

5. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,286.1700 - $1,287.1600. 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 $1,287.1700 - $1,288.1500. 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 $1,288.1800 - $1,289.0500. 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.

8. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,289.2000 - $1,290.1900. 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 $1,290.2000 - $1,291.1300. 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 $1,291.2300 - $1,292.2200. 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 $1,292.2400 - $1,293.2300. 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 $1,293.2600 - $1,294.1500. 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 $1,294.2900 - $1,295.2000. 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 $1,295.5300 - $1,296.3600. 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 $1,296.8000 - $1,297.6500. 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 $1,297.8400 - $1,298.8300. 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 $1,298.9200 - $1,299.6200. 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.

18. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,300.2500 - $1,301.1000. 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 $1,301.5200 - $1,302.1200. 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.

20. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,302.7200 - $1,303.5000. 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 $1,304.3200 - $1,305.1500. 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 $1,305.5200 - $1,306.3400. 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 $1,307.8300 - $1,308.1900. 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 $1,311.1700 - $1,311.4000. 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 L. Quinlan as attorney in fact for Joel Reiss	12/16/2025
	** 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.
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