Joel Reiss - 17 Aug 2026 Form 4 Insider Report for TransDigm Group INC (TDG)

Reporting relationship: Co-Chief Operating Officer
Issuer ticker: TDG
Reported as of: 17 Aug 2026
Net transaction value: -$4,831,152
SEC form: 4
Accepted by SEC: 18 Aug 2026, 16:26:30 UTC
Prior SEC filing: 21 Jul 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 18 Aug 2026.

Key facts

This page summarizes Joel Reiss's Form 4 filing for TransDigm Group INC (TDG).
21 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 18 Aug 2026, 16:26.

Change

Previous filing in this sequence was filed on 21 Jul 2026.
Current net transaction value: -$4,831,152.

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: 18 Aug 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: 17 Aug 2026
Ownership: Direct

TDG transaction

Common Stock

Sale

Transaction value: $172,594
Shares: -140
Change %: -1.9%
Price: $1232.82
Shares after: 7,360
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1

TDG transaction

Common Stock

Sale

Transaction value: $320,806
Shares: -260
Change %: -3.5%
Price: $1233.87
Shares after: 7,100
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F2

TDG transaction

Common Stock

Sale

Transaction value: $403,821
Shares: -327
Change %: -4.6%
Price: $1234.93
Shares after: 6,773
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F3

TDG transaction

Common Stock

Sale

Transaction value: $460,975
Shares: -373
Change %: -5.5%
Price: $1235.86
Shares after: 6,400
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F4

TDG transaction

Common Stock

Sale

Transaction value: $829,892
Shares: -671
Change %: -10%
Price: $1236.80
Shares after: 5,729
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F5

TDG transaction

Common Stock

Sale

Transaction value: $617,696
Shares: -499
Change %: -8.7%
Price: $1237.87
Shares after: 5,230
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F6

TDG transaction

Common Stock

Sale

Transaction value: $421,204
Shares: -340
Change %: -6.5%
Price: $1238.84
Shares after: 4,890
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F7

TDG transaction

Common Stock

Sale

Transaction value: $495,997
Shares: -400
Change %: -8.2%
Price: $1239.99
Shares after: 4,490
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F8

TDG transaction

Common Stock

Sale

Transaction value: $148,893
Shares: -120
Change %: -2.7%
Price: $1240.78
Shares after: 4,370
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F9

TDG transaction

Common Stock

Sale

Transaction value: $139,136
Shares: -112
Change %: -2.6%
Price: $1242.28
Shares after: 4,258
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F10

TDG transaction

Common Stock

Sale

Transaction value: $171,538
Shares: -138
Change %: -3.2%
Price: $1243.03
Shares after: 4,120
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F11

TDG transaction

Common Stock

Sale

Transaction value: $124,391
Shares: -100
Change %: -2.4%
Price: $1243.91
Shares after: 4,020
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F12

TDG transaction

Common Stock

Sale

Transaction value: $180,566
Shares: -145
Change %: -3.6%
Price: $1245.29
Shares after: 3,875
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F13

TDG transaction

Common Stock

Sale

Transaction value: $46,098
Shares: -37
Change %: -0.95%
Price: $1245.90
Shares after: 3,838
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F14

TDG transaction

Common Stock

Sale

Transaction value: $59,871
Shares: -48
Change %: -1.3%
Price: $1247.31
Shares after: 3,790
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F15

TDG transaction

Common Stock

Sale

Transaction value: $74,895
Shares: -60
Change %: -1.6%
Price: $1248.26
Shares after: 3,730
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F16

TDG transaction

Common Stock

Sale

Transaction value: $25,016
Shares: -20
Change %: -0.54%
Price: $1250.82
Shares after: 3,710
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F17

TDG transaction

Common Stock

Sale

Transaction value: $100,169
Shares: -80
Change %: -2.2%
Price: $1252.11
Shares after: 3,630
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F18

TDG transaction

Common Stock

Sale

Transaction value: $37,592
Shares: -30
Change %: -0.83%
Price: $1253.08
Shares after: 3,600
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F19

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 %: -33%
Price: $0.000000^*
Shares after: 8,000
Date: 17 Aug 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 19 footnotes

Footnote F1

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,232.2750 - $1,233.1900. 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 $1,241.6000 - $1,242.5500. 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 $1,242.6200 - $1,243.5300. 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 $1,243.6700 - $1,244.5000. 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 F13

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,244.7300 - $1,245.5800. 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 $1,245.7500 - $1,246.1600. 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 $1,246.8900 - $1,247.8550. 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 $1,247.9400 - $1,248.6700. 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 F17

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,250.6200 - $1,251.0100. 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 F18

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,251.6500 - $1,252.5000. 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 F19

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,252.7500 - $1,253.5500. 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 $1,233.3700 - $1,234.3600. 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 F3

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,234.3700 - $1,235.3600. 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 F4

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,235.4200 - $1,236.3800. 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

Footnote F5

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,236.4300 - $1,237.4100. 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 F6

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,237.4300 - $1,238.3900. 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 $1,238.4300 - $1,239.2900. 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 F8

Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,239.4400 - $1,240.4200. 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 $1,240.6000 - $1,241.2200. 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