[Form 4] TransDigm Group INC Insider Trading Activity

Rhea-AI Filing Summary

Jane M. Cronin, a director of TransDigm Group Incorporated (TDG), reported an acquisition of common stock on 09/19/2025. The Form 4 shows a transaction coded A (acquisition) for 29 shares and includes the figures $1,288.13 and 669.62 in the reporting line. The Explanation of Responses states these shares were received in lieu of payment of a semi-annual director fee under the company’s Director Share Plan and were valued based on fair market value.

The filing is signed by an attorney-in-fact on behalf of the reporting person and indicates the filing was made by one reporting person. No derivative transactions, amendments, or additional material events are disclosed in this Form 4.

Positive

• Director compensation settled with equity under the Director Share Plan, which can align management and shareholder interests
• Clear disclosure of the transaction date (09/19/2025) and the nature of the acquisition in the Form 4

Negative

• None.

Insights

Corporate Governance Specialist

TL;DR: Director received shares instead of cash fees under the Director Share Plan, aligning compensation with shareholder ownership.

The Form 4 documents a routine, non-derivative acquisition by Director Jane M. Cronin dated 09/19/2025. The explanation explicitly states the shares were issued in lieu of a semi-annual director fee and valued at fair market value under the Director Share Plan. This is a common governance practice to align director incentives with shareholders. The filing contains no indication of unusual timing, derivative exercises, or related-party transactions beyond the standard director compensation mechanism. Impact to shareholders appears limited and administrative based on the disclosed information.

Securities Compliance Analyst

TL;DR: Reporting appears procedurally complete; transaction disclosed under Section 16 with supporting explanation.

The Form 4 includes required identification details for the reporting person and issuer, an acquisition coded as 'A', and a brief explanatory note that the shares were issued in lieu of director fees per the Director Share Plan. The form is signed by an attorney-in-fact and filed by a single reporting person. There is no evidence in the filing of amendments, derivative positions, or changes that would raise immediate regulatory concerns. The numeric fields contain values (29; $1,288.13; 669.62) as reported, but the form does not provide further context for all of these figures within its text.

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
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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^*

CRONIN JANE 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)
09/19/2025

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	09/19/2025		A		29(1)	A	$1,288.13	669.62	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

Explanation of Responses:

1. Receipt of stock in lieu of payment of semi-annual director fee, based on fair market value in accordance with the Director Share Plan.

	/s/ Gabrielle Feuer as attorney-in-fact	09/22/2025
	** 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 transaction did Jane M. Cronin report on Form 4 for TDG?

The Form 4 reports an acquisition (code A) of common stock on 09/19/2025, with 29 shares shown in the transaction line.

Why were the shares issued to the director according to the filing?

The Explanation of Responses states the shares were received in lieu of payment of a semi-annual director fee under the Director Share Plan, valued at fair market value.

Who filed the Form 4 and in what capacity?

The filing identifies Jane M. Cronin as the reporting person (a director) and is signed by an attorney-in-fact (/s/ Gabrielle Feuer) on 09/22/2025.

Does the Form 4 disclose any derivative transactions or amendments?

No. The filing contains a Table II header for derivative securities but lists no derivative transactions or amendments.

What other numeric values appear in the transaction line?

The transaction line also includes the figures $1,288.13 and 669.62 as reported in the filing; the form does not provide additional explanation for those specific numbers beyond the transaction row entries.