[Form 4/A] TransDigm Group INC Amended Insider Trading Activity

Rhea-AI Filing Summary

Amended Form 4 for TransDigm Group Inc. (TDG) shows that Robert J. Small, a director, filed an amendment correcting a prior filing and reporting a disposition of 5,625 shares. The earliest transaction date reported is 09/19/2025, and the amendment was filed on 09/22/2025. The filing states the prior Form 4 included an incorrect amount of common stock directly owned by the reporting person. Ownership following the reported transaction is listed as direct. No price per share or proceeds are disclosed in the submitted text.

Positive

• Amendment filed to correct prior error, demonstrating compliance with reporting obligations

Negative

• Disposition of 5,625 shares by a company director is reported (no price disclosed in this text)

Insights

Corporate Governance Expert

TL;DR: Routine amendment correcting a reporting error and reporting a small insider disposition; indicates governance compliance but limited material impact.

The amendment corrects the previously reported direct holdings and records a disposal of 5,625 shares by a company director. Filing an amended Form 4 demonstrates attention to Section 16 reporting obligations and remedial compliance. The disclosure does not include transaction price or proceeds, so market impact and tax/compensation context cannot be assessed from this document alone.

Securities Analyst

TL;DR: Insider sale reported and prior reporting error fixed; disclosure is transparent but lacks transactional financial details.

The report identifies a direct disposition of 5,625 shares with an earliest transaction date of 09/19/2025 and an amendment filed 09/22/2025. Because the filing omits price information and post-transaction share totals beyond noting direct ownership, investors cannot quantify the monetary size or percentage impact of the sale from this filing alone.

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).

1. Name and Address of Reporting Person^*

SMALL ROBERT J

(Last) (First) (Middle)

C/O BERKSHIRE PARTNERS

200 CLARENDON STREET, 35TH FLOOR

(Street)

BOSTON MA 02116

(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)
09/22/2025

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								5,625(1)	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. Prior Form 4 included the incorrect amount of common stock directly owned by the Reporting Person.

	/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 did the Form 4/A for TransDigm Group (TDG) report?

The amended Form 4 reports a disposition of 5,625 shares by director Robert J. Small and corrects an incorrect previously reported direct holding amount.

Who filed the amended Form 4 for TDG?

The reporting person is Robert J. Small, identified as a director, with the amendment signed by an attorney-in-fact on 09/22/2025.

When was the underlying transaction dated in the filing?

The earliest transaction date shown is 09/19/2025 and the amendment was filed on 09/22/2025.

Does the Form 4/A disclose the sale price or proceeds for the 5,625 shares?

No. The provided content does not include a price per share or total proceeds for the disposition.

Why was the Form 4 amended?

The amendment states the prior Form 4 "included the incorrect amount of common stock directly owned by the Reporting Person."