TransDigm director granted 52 shares at $1,085

The filer has since corrected this document, so the figures below are the ones originally reported and some of them may have changed. Read the amended Form 4/A for what the company says now.

Rhea-AI Filing Summary

TransDigm Group INC (TDG) director Robert J. Small reported an acquisition of 52 shares of Common Stock on September 18, 2026, as a grant/award received in stock in lieu of his semi-annual director fee under the company’s Director Share Plan at a reported value of $1,085 per share. After this award, he holds 5,677 shares directly, plus indirect holdings reported as 60,246 shares by family trusts, 366,141 shares by Stockbridge Fund, L.P., and 68,139 shares by Stockbridge Partners LLC. No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Grant/Award: 52 shares

Grant/Award 4 txns

Insider SMALL ROBERT J

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	52	$1,085.00	$56K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 5,677 shares (Direct); Common Stock — 60,246 shares (Indirect, By Family Trusts); Common Stock — 366,141 shares (Indirect, By Stockbridge Fund, L.P.); Common Stock — 68,139 shares (Indirect, By Stockbridge Partners LLC)

Footnotes (1)

1. F1. Receipt of stock in lieu of payment of semi-annual director fee, based on fair market value in accordance with the Director Share Plan.

Key Figures

Shares granted: 52 shares of Common Stock Per-share value for director stock receipt: $1,085 per share Direct holdings after transaction: 5,677 shares +3 more

6 metrics

Shares granted 52 shares of Common Stock Grant/award to director on September 18, 2026 in lieu of cash director fee

Per-share value for director stock receipt $1,085 per share Fair market value used to convert semi-annual director fee into stock

Direct holdings after transaction 5,677 shares Common Stock directly owned by Robert J. Small after the award

Indirect holdings by family trusts 60,246 shares Common Stock held indirectly by family trusts

Indirect holdings by Stockbridge Fund, L.P. 366,141 shares Common Stock held indirectly through Stockbridge Fund, L.P.

Indirect holdings by Stockbridge Partners LLC 68,139 shares Common Stock held indirectly through Stockbridge Partners LLC

Key Terms

Director Share Plan, semi-annual director fee, indirect ownership

3 terms

Director Share Plan financial

"in accordance with the Director Share Plan"

semi-annual director fee financial

"Receipt of stock in lieu of payment of semi-annual director fee"

indirect ownership financial

"Indirect ownership is reported by family trusts and investment entities"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did TDG director Robert J. Small report on September 18, 2026?

He reported a grant of 52 shares of TransDigm Group INC Common Stock, received as stock in lieu of his semi-annual director fee under the Director Share Plan, valued at $1,085 per share.

How many TDG shares does Robert J. Small hold directly after this Form 4?

After the September 18, 2026 award, Robert J. Small holds 5,677 shares of TransDigm Group INC Common Stock in direct ownership.

What indirect TDG shareholdings are reported for Robert J. Small?

Indirectly, holdings are reported as 60,246 shares by family trusts, 366,141 shares by Stockbridge Fund, L.P., and 68,139 shares by Stockbridge Partners LLC, all in Common Stock of TransDigm Group INC.

Was the TDG insider stock award made under a Rule 10b5-1 trading plan?

No. The filing shows the Rule 10b5-1 checkbox as not affirmed, and the footnote describes the award simply as receipt of stock in lieu of a semi-annual director fee under the Director Share Plan.

What is the nature of the TDG stock grant reported by Robert J. Small?

The 52-share grant is described as receipt of stock in lieu of payment of the semi-annual director fee, based on fair market value in accordance with TransDigm’s Director Share Plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/21/2026 - 04:49 PM Accepted by SEC EDGAR 09/21/2026 - 04:49 PM Learn about SEC filing dates

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^*

SMALL ROBERT J

(Last) (First) (Middle)

C/O BERKSHIRE PARTNERS LLC

200 CLARENDON STREET, 35TH FLOOR

(Street)

BOSTON MASSACHUSETTS 02116

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	09/18/2026		A		52(1)	A	$1,085	5,677	D
Common Stock								60,246	I	By Family Trusts
Common Stock								366,141	I	By Stockbridge Fund, L.P.
Common Stock								68,139	I	By Stockbridge Partners LLC

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.

Remarks:

	/s/Rachel Quinlan, as attorney in fact for SMALL ROBERT J	09/21/2026
	** 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.
* Form 4: SEC 1474 (03-26)