[Form 4] TransDigm Group INC Insider Trading Activity

Rhea-AI Filing Summary

TransDigm Group Inc. (TDG) director and President & CEO Michael J. Lisman reported multiple open‑market purchases of common stock on 11/14/2025 through the Michael Lisman Declaration of Trust dated January 31, 2023. The trust acquired 1,954 shares of TransDigm common stock in several transactions, including 600 shares at $1,334.13 and additional blocks at weighted average prices of $1,337.3825, $1,338.5578, $1,341.4904, $1,342.9335, and $1,344.7603 per share. After these transactions, Lisman is reported as beneficially owning 1,954 shares indirectly via the trust and 2,309 shares directly, with the direct holdings noted as previously omitted from an earlier report.

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).

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^*

Lisman Michael

(Last) (First) (Middle)

1350 EUCLID AVENUE

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
X	Officer (give title below)		Other (specify below)
	President & CEO

3. Date of Earliest Transaction (Month/Day/Year)
11/14/2025

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	11/14/2025		P		600	A	$1,334.13	600	I	Michael Lisman Declaration of Trust dated January 31, 2023
Common Stock	11/14/2025		P		55	A	$1,337.3825(2)	655	I	Michael Lisman Declaration of Trust dated January 31, 2023
Common Stock	11/14/2025		P		290	A	$1,338.5578(3)	945	I	Michael Lisman Declaration of Trust dated January 31, 2023
Common Stock	11/14/2025		P		521	A	$1,341.4904(4)	1,466	I	Michael Lisman Declaration of Trust dated January 31, 2023
Common Stock	11/14/2025		P		384	A	$1,342.9335(5)	1,850	I	Michael Lisman Declaration of Trust dated January 31, 2023
Common Stock	11/14/2025		P		104	A	$1,344.7603(6)	1,954	I	Michael Lisman Declaration of Trust dated January 31, 2023
Common Stock								2,309(1)	D
Common Stock								1,954	I	Michael Lisman Declaration of Trust dated January 31, 2023

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. These shares were inadvertently omitted from the reporting person's Form 4 filed on February 27, 2024

2. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1,336.8350 to $1,337.7575. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

3. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1,338.1500 to $1,338.5650. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

4. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1,341.4900 to $1,341.7100. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

5. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1,342.7350 to $1,343.3100. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

6. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1,344.3700 to $1,344.7800. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

	/s/ Rachel L. Quinlan as attorney in fact for Michael J. Lisman	11/17/2025
	** 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 TDG CEO Michael J. Lisman report?

Michael J. Lisman, a director and President & CEOTransDigm Group Inc. (TDG), reported multiple open‑market purchases of the companys common stock on 11/14/2025 through the Michael Lisman Declaration of Trust dated January 31, 2023.

How many TransDigm (TDG) shares did the trust buy on 11/14/2025?

The Michael Lisman Declaration of Trust acquired a total of 1,954 shares of TransDigm common stock on 11/14/2025, in several separate purchase transactions.

At what prices were the TDG shares purchased by the trust?

The trust bought TransDigm common stock at a price of $1,334.13 for one block of 600 shares, and at weighted average prices of $1,337.3825, $1,338.5578, $1,341.4904, $1,342.9335, and $1,344.7603 per share for additional blocks.

How many TDG shares does Michael J. Lisman beneficially own after the reported transactions?

After the reported transactions, Michael J. Lisman is shown as beneficially owning 1,954 shares indirectly through the Michael Lisman Declaration of Trust dated January 31, 2023 and 2,309 shares directly of TransDigm common stock.

What does the Form 4 say about the previously omitted TDG shares?

The explanation notes that the 2,309 directly held shares of TransDigm common stock were inadvertently omitted from a report filed on February 27, 2024, and are now reflected in the beneficial ownership totals.

Who signed the Form 4 reporting the TDG insider transactions?

The Form 4 was signed by /s/ Rachel L. Quinlan as attorney in fact for Michael J. Lisman, dated 11/17/2025.