[Form 4] TransDigm Group INC Insider Trading Activity

Rhea-AI Filing Summary

TransDigm (TDG) insider activity: Joel Reiss, listed as Co-Chief Operating Officer, reported transactions dated 09/22/2025. He exercised a stock option covering 3,000 shares at an exercise price of $284.97 and simultaneously sold 3,000 common shares in multiple trades at weighted average prices reported in ranges of approximately $1,270.01 to $1,279.40 per share.

After these transactions Reiss beneficially owned 3,600 shares of common stock and continued to hold 50,000 stock options exercisable through 11/08/2027. The Form 4 was signed by an attorney-in-fact on 09/24/2025 and includes weighted-average price explanations for the sales.

Positive

• Detailed disclosure of exercise and multiple sales with weighted-average price ranges provided
• Timely reporting: transactions dated 09/22/2025 and Form 4 signed 09/24/2025
• Continued ownership of substantial options: 50,000 stock options remain outstanding

Negative

• Direct common stock ownership decreased to 3,600 shares after the reported sales

Insights

Financial Analyst

TL;DR: Executive exercised options then sold an equal number of shares; remaining direct ownership modest versus option holdings.

The filing shows a routine option exercise of 3,000 shares at $284.97 followed by the sale of those 3,000 shares across multiple executions at average prices within $1,270–$1,279 per share. Net direct common stock ownership fell to 3,600 shares while derivative holdings remain at 50,000 options expiring 11/08/2027. This is a standard liquidity transaction by an insider and does not, by itself, disclose company operational changes or new material information.

Corporate Governance Expert

TL;DR: Disclosure complies with Section 16 reporting: exercise and contemporaneous sales are itemized with price ranges.

The Form 4 provides required detail: transaction codes, amounts, post-transaction beneficial ownership, and weighted-average sale-price explanations. The trades were reported promptly and signed by an authorized attorney-in-fact. No departures from standard disclosure practice are evident in the form's content.

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).

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)
09/22/2025

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	09/22/2025		M		3,000	A	$284.97	6,600	D
Common Stock	09/22/2025		S		136	D	$1,270.1465(1)	6,464	D
Common Stock	09/22/2025		S		122	D	$1,271.3634(2)	6,342	D
Common Stock	09/22/2025		S		222	D	$1,272.7116(3)	6,120	D
Common Stock	09/22/2025		S		120	D	$1,274.2938(4)	6,000	D
Common Stock	09/22/2025		S		55	D	$1,274.8564(5)	5,945	D
Common Stock	09/22/2025		S		1,288	D	$1,276.0513(6)	4,657	D
Common Stock	09/22/2025		S		422	D	$1,277.1839(7)	4,235	D
Common Stock	09/22/2025		S		635	D	$1,279.1467(8)	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	09/22/2025		M			3,000	09/30/2021	11/08/2027	Common Stock	3,000	$0	50,000	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 $1,270.0100 - $1,270.3300. 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 $1,271.2000 - $1,272.1500. 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.

3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,272.2000 - $1,273.1900. 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.

4. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,273.7000 - $1,274.4125. 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 $1,274.7500 - $1,275.7400. 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 $1,275.7425 - $1,276.6800. 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 $1,276.8800 - $1,277.7025. 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 $1,279.0500 - $1,279.4000. 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/ Gabrielle Feuer as attorney-in-fact	09/24/2025
	** 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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FAQ

What did Joel Reiss (TDG) do on 09/22/2025?

He exercised 3,000 stock option shares at an exercise price of $284.97 and sold 3,000 common shares in multiple transactions at weighted-average prices in the $1,270–$1,279 range.

How many TDG shares does Joel Reiss own after these transactions?

Following the reported transactions, Joel Reiss beneficially owned 3,600 shares of common stock.

Does Joel Reiss still hold options in TDG after the transactions?

Yes. The Form 4 reports 50,000 stock options beneficially owned, exercisable with an expiration date of 11/08/2027.

Were the sale prices for the shares disclosed precisely?

The filing provides weighted-average price disclosures and price ranges for each grouped sale rather than a per-share price; the ranges span approximately $1,270.01 to $1,279.40 depending on the sale group.

Who signed the Form 4 and when?

The Form 4 was signed by Gabrielle Feuer as attorney-in-fact on 09/24/2025.