Robert J. Small - 10 Dec 2025 Form 4 Insider Report for TransDigm Group INC (TDG)

Reporting relationship: Director
Issuer ticker: TDG
Reported as of: 10 Dec 2025
Net transaction value: -$5,751,470
SEC form: 4
Accepted by SEC: 11 Dec 2025, 16:13:00 UTC
Prior SEC filing: 09 Dec 2025
Next SEC filing: 27 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Rachel L. Quinlan as attorney in fact for Robert Small

Key filing fact

Robert J. Small filed Form 4 for TransDigm Group INC (TDG) on 11 Dec 2025.

Key facts

This page summarizes Robert J. Small's Form 4 filing for TransDigm Group INC (TDG).
5 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 11 Dec 2025, 16:13.

Change

Previous filing in this sequence was filed on 09 Dec 2025.
Current net transaction value: -$5,751,470.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001234544 Primary reporting owner

SMALL ROBERT J

Relationship: Director
Address: C/O BERKSHIRE PARTNERS, 200 CLARENDON STREET, 35TH FLOOR, BOSTON
Signature: /s/ Rachel L. Quinlan as attorney in fact for Robert Small
Signature date: 11 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

TDG transaction

Common Stock

Options Exercise

Transaction value: $312,409
Shares: +4,700
Change %: +84%
Price: $66.47
Shares after: 10,325
Date: 10 Dec 2025
Ownership: Direct
Footnotes: F1

TDG transaction

Common Stock

Sale

Transaction value: $747,805
Shares: -580
Change %: -5.6%
Price: $1289.32
Shares after: 9,745
Date: 10 Dec 2025
Ownership: Direct
Footnotes: F2

TDG transaction

Common Stock

Sale

Transaction value: $5,220,537
Shares: -4,046
Change %: -42%
Price: $1290.30
Shares after: 5,699
Date: 10 Dec 2025
Ownership: Direct
Footnotes: F3

TDG transaction

Common Stock

Sale

Transaction value: $95,536
Shares: -74
Change %: -1.3%
Price: $1291.03
Shares after: 5,625
Date: 10 Dec 2025
Ownership: Direct
Footnotes: F4

TDG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 366,141
Date: 10 Dec 2025
Ownership: By Stockbridge Fund, L.P.

TDG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 68,139
Date: 10 Dec 2025
Ownership: By Stockbridge Partners LLC

TDG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 60,246
Date: 10 Dec 2025
Ownership: By Family Trusts

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

TDG transaction Derivative

Stock Option

Options Exercise

Transaction value: $0
Shares: -4,700
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 10 Dec 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 4,700
Exercise price: $66.47

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

The exercise price has been adjusted for dividends declared since August 1, 2022.

Footnote F2

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1288.9000 - $1,289.5600. 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.

Footnote F3

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1290.0300 - $1,290.5200. 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.

Footnote F4

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1291.0300 - $1,291.0400. 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.