Key facts
- This page summarizes Kevin M. Stein's Form 4 filing for TransDigm Group INC (TDG).
- 26 reported transactions and 2 derivative rows are listed below.
- Accepted by SEC: 03 Feb 2026, 16:37.
Kevin M. Stein - 02 Feb 2026 Form 4 Insider Report for TransDigm Group INC (TDG)
- Reporting relationship
- Director
- Issuer ticker
- TDG
- Reported as of
- 02 Feb 2026
- Net transaction value
- -$36,241,996
- SEC form
- 4
- Accepted by SEC
- 03 Feb 2026, 16:37:39 UTC
- Prior SEC filing
- 16 Jan 2026
- Next SEC filing
- 05 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Rachel Quinlan as attorney in fact for Kevin Stein
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Kevin M. Stein filed Form 4 for TransDigm Group INC (TDG) on 03 Feb 2026.
Change
- Previous filing in this sequence was filed on 16 Jan 2026.
- Current net transaction value: -$36,241,996.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001431675
Primary reporting owner
Stein Kevin M
- Relationship
- Director
- Address
- 1350 EUCLID AVE, SUITE 1600, CLEVELAND
- Signature
- /s/ Rachel Quinlan as attorney in fact for Kevin Stein
- Signature date
- 03 Feb 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
TDG
transaction
Common Stock
Options Exercise
- Transaction value
- $8,532,000
- Shares
- +25,000
- Change %
- +306%
- Price
- $341.28
- Shares after
- 33,158
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F1
TDG
transaction
Common Stock
Options Exercise
- Transaction value
- $7,873,130
- Shares
- +23,000
- Change %
- +69%
- Price
- $342.31
- Shares after
- 56,158
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F1
TDG
transaction
Common Stock
Sale
- Transaction value
- $56,187
- Shares
- -40
- Change %
- -0.07%
- Price
- $1404.68
- Shares after
- 56,118
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
TDG
transaction
Common Stock
Sale
- Transaction value
- $306,893
- Shares
- -218
- Change %
- -0.39%
- Price
- $1407.76
- Shares after
- 55,900
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F2
TDG
transaction
Common Stock
Sale
- Transaction value
- $2,819
- Shares
- -2
- Change %
- -0%
- Price
- $1409.71
- Shares after
- 55,898
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
TDG
transaction
Common Stock
Sale
- Transaction value
- $8,466
- Shares
- -6
- Change %
- -0.01%
- Price
- $1410.98
- Shares after
- 55,892
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F3
TDG
transaction
Common Stock
Sale
- Transaction value
- $1,412
- Shares
- -1
- Change %
- -0%
- Price
- $1412.26
- Shares after
- 55,891
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
TDG
transaction
Common Stock
Sale
- Transaction value
- $247,458
- Shares
- -175
- Change %
- -0.31%
- Price
- $1414.04
- Shares after
- 55,716
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F4
TDG
transaction
Common Stock
Sale
- Transaction value
- $82,033
- Shares
- -58
- Change %
- -0.1%
- Price
- $1414.36
- Shares after
- 55,658
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F5
TDG
transaction
Common Stock
Sale
- Transaction value
- $73,613
- Shares
- -52
- Change %
- -0.09%
- Price
- $1415.63
- Shares after
- 55,606
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F6
TDG
transaction
Common Stock
Sale
- Transaction value
- $2,833
- Shares
- -2
- Change %
- -0%
- Price
- $1416.40
- Shares after
- 55,604
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F7
TDG
transaction
Common Stock
Sale
- Transaction value
- $68,037
- Shares
- -48
- Change %
- -0.09%
- Price
- $1417.44
- Shares after
- 55,556
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F8
TDG
transaction
Common Stock
Sale
- Transaction value
- $158,976
- Shares
- -112
- Change %
- -0.2%
- Price
- $1419.43
- Shares after
- 55,444
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F9
TDG
transaction
Common Stock
Sale
- Transaction value
- $316,774
- Shares
- -223
- Change %
- -0.4%
- Price
- $1420.51
- Shares after
- 55,221
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F10
TDG
transaction
Common Stock
Sale
- Transaction value
- $1,224,109
- Shares
- -861
- Change %
- -1.6%
- Price
- $1421.73
- Shares after
- 54,360
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F11
TDG
transaction
Common Stock
Sale
- Transaction value
- $3,045,521
- Shares
- -2,141
- Change %
- -3.9%
- Price
- $1422.48
- Shares after
- 52,219
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F12
TDG
transaction
Common Stock
Sale
- Transaction value
- $5,690,381
- Shares
- -3,997
- Change %
- -7.7%
- Price
- $1423.66
- Shares after
- 48,222
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F13
TDG
transaction
Common Stock
Sale
- Transaction value
- $6,921,488
- Shares
- -4,859
- Change %
- -10%
- Price
- $1424.47
- Shares after
- 43,363
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F14
TDG
transaction
Common Stock
Sale
- Transaction value
- $8,419,438
- Shares
- -5,906
- Change %
- -14%
- Price
- $1425.57
- Shares after
- 37,457
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F15
TDG
transaction
Common Stock
Sale
- Transaction value
- $8,081,724
- Shares
- -5,665
- Change %
- -15%
- Price
- $1426.61
- Shares after
- 31,792
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F16
TDG
transaction
Common Stock
Sale
- Transaction value
- $9,513,515
- Shares
- -6,665
- Change %
- -21%
- Price
- $1427.38
- Shares after
- 25,127
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F17
TDG
transaction
Common Stock
Sale
- Transaction value
- $2,953,008
- Shares
- -2,067
- Change %
- -8.2%
- Price
- $1428.64
- Shares after
- 23,060
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F18
TDG
transaction
Common Stock
Sale
- Transaction value
- $2,587,600
- Shares
- -1,810
- Change %
- -7.8%
- Price
- $1429.61
- Shares after
- 21,250
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F19
TDG
transaction
Common Stock
Sale
- Transaction value
- $2,884,841
- Shares
- -2,017
- Change %
- -9.5%
- Price
- $1430.26
- Shares after
- 19,233
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Footnotes
- F20
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
- -23,000
- Change %
- -53%
- Price
- $0.000000
- Shares after
- 20,000
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Underlying class
- Common Stock
- Underlying amount
- 23,000
- Exercise price
- $342.31
- Footnotes
- F1
TDG
transaction
Derivative
Stock Option
Options Exercise
- Transaction value
- $0
- Shares
- -25,000
- Change %
- -58%
- Price
- $0.000000
- Shares after
- 17,940
- Date
- 02 Feb 2026
- Ownership
- Fortuna Trust dated June 1, 2018
- Underlying class
- Common Stock
- Underlying amount
- 25,000
- Exercise price
- $341.28
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 20 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 $1,407.1000 - $1,407.8900. 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 $1,410.9300 - $1,411.2300. 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 $1,413.3000 - $1,414.2900. 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 F5
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,414.3000 - $1,414.6900. 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 F6
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,415.3000 - $1,416.1000. 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 F7
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,416.3300 - $1,416.4600. 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 F8
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,417.4150 - $1,417.5900. 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 F9
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,418.8500 - $1,419.7000. 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 F10
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,420.0200 - $1,420.8800. 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 F11
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,421.0200 - $1,422.0100. 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 F12
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,422.0200 - $1,423.0100. 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 F13
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,423.0200 - $1,424.0100. 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 F14
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,424.0300 - $1,425.0200. 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 F15
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,425.0300 - $1,426.0200. 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 F16
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,426.0300 - $1,427.0100. 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 F17
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,427.0300 - $1,428.0200. 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 F18
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,428.0300 - $1,429.0200. 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 F19
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,429.0500 - $1,430.0400. 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.
Footnote F20
Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,430.0500 - $1,431.0300. 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.
SEC remarks
Due to a 30-line item limitation in Table 1, this is the first of two Form 4s filed by the reporting person for this transaction.