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

Reporting relationship: Co-Chief Operating Officer
Issuer ticker: TDG
Reported as of: 15 Oct 2026
Net transaction value: -$4,624,944
SEC form: 4
Accepted by SEC: 16 Oct 2026, 16:19:35 UTC
Prior SEC filing: 16 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Rachel L. Quinlan as attorney in fact for Joel Reiss

Filing notes and source

Key filing fact

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

Key facts

This page summarizes Joel Reiss's Form 4 filing for TransDigm Group INC (TDG).
23 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 16 Oct 2026, 16:19.

Change

Previous filing in this sequence was filed on 16 Sep 2026.
Current net transaction value: -$4,624,944.

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 Oct 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: +4,100
Change %: +114%
Price: $284.97^*
Shares after: 7,700
Date: 15 Oct 2026
Ownership: Direct

TDG transaction

Common Stock

Sale

Transaction value: $22,245
Shares: -20
Change %: -0.26%
Price: $1112.26
Shares after: 7,680
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F1

TDG transaction

Common Stock

Sale

Transaction value: $111,358
Shares: -100
Change %: -1.3%
Price: $1113.58
Shares after: 7,580
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F2

TDG transaction

Common Stock

Sale

Transaction value: $111,482
Shares: -100
Change %: -1.3%
Price: $1114.82
Shares after: 7,480
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F3

TDG transaction

Common Stock

Sale

Transaction value: $55,801
Shares: -50
Change %: -0.67%
Price: $1116.02
Shares after: 7,430
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F4

TDG transaction

Common Stock

Sale

Transaction value: $67,027
Shares: -60
Change %: -0.81%
Price: $1117.11
Shares after: 7,370
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F5

TDG transaction

Common Stock

Sale

Transaction value: $111,901
Shares: -100
Change %: -1.4%
Price: $1119.01
Shares after: 7,270
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F6

TDG transaction

Common Stock

Sale

Transaction value: $33,609
Shares: -30
Change %: -0.41%
Price: $1120.30
Shares after: 7,240
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F7

TDG transaction

Common Stock

Sale

Transaction value: $67,295
Shares: -60
Change %: -0.83%
Price: $1121.58
Shares after: 7,180
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F8

TDG transaction

Common Stock

Sale

Transaction value: $147,124
Shares: -131
Change %: -1.8%
Price: $1123.09
Shares after: 7,049
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F9

TDG transaction

Common Stock

Sale

Transaction value: $343,944
Shares: -306
Change %: -4.3%
Price: $1124.00
Shares after: 6,743
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F10

TDG transaction

Common Stock

Sale

Transaction value: $675,001
Shares: -600
Change %: -8.9%
Price: $1125.00
Shares after: 6,143
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F11

TDG transaction

Common Stock

Sale

Transaction value: $312,989
Shares: -278
Change %: -4.5%
Price: $1125.86
Shares after: 5,865
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F12

TDG transaction

Common Stock

Sale

Transaction value: $343,739
Shares: -305
Change %: -5.2%
Price: $1127.01
Shares after: 5,560
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F13

TDG transaction

Common Stock

Sale

Transaction value: $135,348
Shares: -120
Change %: -2.2%
Price: $1127.90
Shares after: 5,440
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F14

TDG transaction

Common Stock

Sale

Transaction value: $169,407
Shares: -150
Change %: -2.8%
Price: $1129.38
Shares after: 5,290
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F15

TDG transaction

Common Stock

Sale

Transaction value: $113,006
Shares: -100
Change %: -1.9%
Price: $1130.06
Shares after: 5,190
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F16

TDG transaction

Common Stock

Sale

Transaction value: $147,072
Shares: -130
Change %: -2.5%
Price: $1131.33
Shares after: 5,060
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F17

TDG transaction

Common Stock

Sale

Transaction value: $237,783
Shares: -210
Change %: -4.2%
Price: $1132.30
Shares after: 4,850
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F18

TDG transaction

Common Stock

Sale

Transaction value: $359,442
Shares: -317
Change %: -6.5%
Price: $1133.89
Shares after: 4,533
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F19

TDG transaction

Common Stock

Sale

Transaction value: $561,823
Shares: -495
Change %: -11%
Price: $1135.00
Shares after: 4,038
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F20

TDG transaction

Common Stock

Sale

Transaction value: $497,548
Shares: -438
Change %: -11%
Price: $1135.95
Shares after: 3,600
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F21

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: -4,100
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 15 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 4,100
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 21 footnotes

Footnote F1

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,111.9600 - $1,112.5700. 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 F10

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,123.4400 - $1,124.4100. 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 $1,124.4600 - $1,125.4400. 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 $1,125.4800 - $1,126.3300. 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 $1,126.4800 - $1,127.4500. 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 F14

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,127.6400 - $1,128.5000. 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 $1,128.7700 - $1,129.7600. 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 $1,129.8000 - $1,130.7600. 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 $1,130.9100 - $1,131.7800. 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 $1,131.9200 - $1,132.8800. 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 F19

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,133.4400 - $1,134.4150. 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 $1,113.2100 - $1,114.0300. 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.

Footnote F20

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,134.4700 - $1,135.4500. 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 F21

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,135.5100 - $1,136.2400. 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 $1,114.5200 - $1,115.1300. 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 $1,115.7000 - $1,116.6700. 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 $1,116.7500 - $1,117.6800. 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 $1,118.6700 - $1,119.2000. 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 $1,120.2200 - $1,120.3500. 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 $1,121.2600 - $1,122.0700. 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 $1,122.4300 - $1,123.3800. 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.