Joel Reiss - 15 Sep 2026 Form 4 Insider Report for TransDigm Group INC (TDG)

Reporting relationship: Co-Chief Operating Officer
Issuer ticker: TDG
Reported as of: 15 Sep 2026
Net transaction value: -$4,268,872
SEC form: 4
Accepted by SEC: 16 Sep 2026, 17:09:56 UTC
Prior SEC filing: 18 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Rachel L. Quinlan as attorney in fact for Joel Reiss

Key filing fact

Joel Reiss filed Form 4 for TransDigm Group INC (TDG) on 16 Sep 2026.

Key facts

This page summarizes Joel Reiss's Form 4 filing for TransDigm Group INC (TDG).
29 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 16 Sep 2026, 17:09.

Change

Previous filing in this sequence was filed on 18 Aug 2026.
Current net transaction value: -$4,268,872.

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 0001656109 Primary reporting owner

Reiss Joel

Relationship: Co-Chief Operating Officer
Address: 1350 EUCLID AVE, SUITE 1600, CLEVELAND
Signature: /s/ Rachel L. Quinlan as attorney in fact for Joel Reiss
Signature date: 16 Sep 2026

Reported non-derivative transactions

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

TDG transaction

Common Stock

Options Exercise

Transaction value
Shares: +3,900
Change %: +108%
Price: $284.97^*
Shares after: 7,500
Date: 15 Sep 2026
Ownership: Direct

TDG transaction

Common Stock

Sale

Transaction value: $335,719
Shares: -310
Change %: -4.1%
Price: $1082.96
Shares after: 7,190
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F1

TDG transaction

Common Stock

Sale

Transaction value: $184,224
Shares: -170
Change %: -2.4%
Price: $1083.67
Shares after: 7,020
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F2

TDG transaction

Common Stock

Sale

Transaction value: $260,369
Shares: -240
Change %: -3.4%
Price: $1084.87
Shares after: 6,780
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F3

TDG transaction

Common Stock

Sale

Transaction value: $119,490
Shares: -110
Change %: -1.6%
Price: $1086.27
Shares after: 6,670
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F4

TDG transaction

Common Stock

Sale

Transaction value: $130,499
Shares: -120
Change %: -1.8%
Price: $1087.49
Shares after: 6,550
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F5

TDG transaction

Common Stock

Sale

Transaction value: $10,881
Shares: -10
Change %: -0.15%
Price: $1088.06
Shares after: 6,540
Date: 15 Sep 2026
Ownership: Direct

TDG transaction

Common Stock

Sale

Transaction value: $76,304
Shares: -70
Change %: -1.1%
Price: $1090.06
Shares after: 6,470
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F6

TDG transaction

Common Stock

Sale

Transaction value: $109,100
Shares: -100
Change %: -1.5%
Price: $1091.00
Shares after: 6,370
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F7

TDG transaction

Common Stock

Sale

Transaction value: $185,662
Shares: -170
Change %: -2.7%
Price: $1092.13
Shares after: 6,200
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F8

TDG transaction

Common Stock

Sale

Transaction value: $308,255
Shares: -282
Change %: -4.5%
Price: $1093.10
Shares after: 5,918
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F9

TDG transaction

Common Stock

Sale

Transaction value: $419,025
Shares: -383
Change %: -6.5%
Price: $1094.06
Shares after: 5,535
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F10

TDG transaction

Common Stock

Sale

Transaction value: $246,399
Shares: -225
Change %: -4.1%
Price: $1095.11
Shares after: 5,310
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F11

TDG transaction

Common Stock

Sale

Transaction value: $214,849
Shares: -196
Change %: -3.7%
Price: $1096.17
Shares after: 5,114
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F12

TDG transaction

Common Stock

Sale

Transaction value: $322,595
Shares: -294
Change %: -5.7%
Price: $1097.26
Shares after: 4,820
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F13

TDG transaction

Common Stock

Sale

Transaction value: $164,761
Shares: -150
Change %: -3.1%
Price: $1098.41
Shares after: 4,670
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F14

TDG transaction

Common Stock

Sale

Transaction value: $98,923
Shares: -90
Change %: -1.9%
Price: $1099.14
Shares after: 4,580
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F15

TDG transaction

Common Stock

Sale

Transaction value: $66,024
Shares: -60
Change %: -1.3%
Price: $1100.41
Shares after: 4,520
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F16

TDG transaction

Common Stock

Sale

Transaction value: $182,853
Shares: -166
Change %: -3.7%
Price: $1101.52
Shares after: 4,354
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F17

TDG transaction

Common Stock

Sale

Transaction value: $302,082
Shares: -274
Change %: -6.3%
Price: $1102.49
Shares after: 4,080
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F18

TDG transaction

Common Stock

Sale

Transaction value: $231,722
Shares: -210
Change %: -5.1%
Price: $1103.44
Shares after: 3,870
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F19

TDG transaction

Common Stock

Sale

Transaction value: $138,072
Shares: -125
Change %: -3.2%
Price: $1104.58
Shares after: 3,745
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F20

TDG transaction

Common Stock

Sale

Transaction value: $5,526
Shares: -5
Change %: -0.13%
Price: $1105.28
Shares after: 3,740
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F21

TDG transaction

Common Stock

Sale

Transaction value: $44,267
Shares: -40
Change %: -1.1%
Price: $1106.69
Shares after: 3,700
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F22

TDG transaction

Common Stock

Sale

Transaction value: $33,250
Shares: -30
Change %: -0.81%
Price: $1108.34
Shares after: 3,670
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F23

TDG transaction

Common Stock

Sale

Transaction value: $33,371
Shares: -30
Change %: -0.82%
Price: $1112.38
Shares after: 3,640
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F24

TDG transaction

Common Stock

Sale

Transaction value: $22,267
Shares: -20
Change %: -0.55%
Price: $1113.37
Shares after: 3,620
Date: 15 Sep 2026
Ownership: Direct

TDG transaction

Common Stock

Sale

Transaction value: $22,380
Shares: -20
Change %: -0.55%
Price: $1119.00
Shares after: 3,600
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F25

Reported derivative securities

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

TDG transaction Derivative

Stock Option

Options Exercise

Transaction value
Shares: -3,900
Change %: -49%
Price: $0.000000^*
Shares after: 4,100
Date: 15 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,900
Exercise price: $284.97

^* 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 25 footnotes

Footnote F1

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,082.3500 - $1,083.2700. 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 $1,093.6200 - $1,094.5600. 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 F11

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,094.6300 - $1,095.5700. 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 $1,095.7000 - $1,096.6900. 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 F13

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,096.7000 - $1,097.6900. 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 F14

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,097.7200 - $1,098.7100. 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 $1,098.7700 - $1,099.6500. 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 $1,099.9300 - $1,100.7000. 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 F17

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,100.9400 - $1,101.9200. 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 $1,102.0000 - $1,102.9800. 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 $1,103.0100 - $1,103.8850. 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 F2

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,083.3700 - $1,084.2700. 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 $1,104.0300 - $1,105.0100. 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 F21

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,105.2400 - $1,105.4600. 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 F22

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,106.3200 - $1,106.8900. 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 F23

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,108.2300 - $1,108.4000. 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 F24

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,112.3400 - $1,112.4500. 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 F25

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,118.9700 - $1,119.0200. 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 F3

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,084.6500 - $1,085.2700. 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 $1,085.7600 - $1,086.5700. 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 $1,087.0000 - $1,087.9200. 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 $1,089.5400 - $1,090.3600. 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 $1,090.5800 - $1,091.4500. 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 $1,091.5800 - $1,092.5700. 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 $1,092.5800 - $1,093.5700. 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.