=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-04-15
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: TransDigm Group INC (TDG)
CIK: 0001260221
--- Reporting Owner ---
Name: Reiss Joel
CIK: 0001656109
Role: Officer (Co-Chief Operating Officer)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2026-04-15 | Code: M (Exercise of derivative)
Shares: +3,900 | Price: $284.97
Total Value: $1,111,383.00
Shares Owned After: 7,500 | Ownership: D (Direct)
[Transaction #2]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -233 | Price: $1,274.57
Total Value: $296,975.60
Shares Owned After: 7,267 | Ownership: D (Direct)
Footnotes:
[F1] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,273.8500 - $1,274.7400. 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
[Transaction #3]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -120 | Price: $1,275.19
Total Value: $153,022.37
Shares Owned After: 7,147 | Ownership: D (Direct)
Footnotes:
[F2] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,274.9200 - $1,275.7800. 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
[Transaction #4]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -383 | Price: $1,276.49
Total Value: $488,894.90
Shares Owned After: 6,764 | Ownership: D (Direct)
Footnotes:
[F3] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,275.9300 - $1,276.9200. 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
[Transaction #5]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -203 | Price: $1,277.23
Total Value: $259,276.96
Shares Owned After: 6,561 | Ownership: D (Direct)
Footnotes:
[F4] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,276.9400 - $1,277.9300. 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
[Transaction #6]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -390 | Price: $1,278.41
Total Value: $498,579.94
Shares Owned After: 6,171 | Ownership: D (Direct)
Footnotes:
[F5] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,277.9600 - $1,278.9300. 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
[Transaction #7]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -519 | Price: $1,279.39
Total Value: $664,001.18
Shares Owned After: 5,652 | Ownership: D (Direct)
Footnotes:
[F6] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,278.9600 - $1,279.9500. 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
[Transaction #8]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -574 | Price: $1,280.41
Total Value: $734,955.86
Shares Owned After: 5,078 | Ownership: D (Direct)
Footnotes:
[F7] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,279.9800 - $1,280.9700. 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
[Transaction #9]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -377 | Price: $1,281.58
Total Value: $483,156.38
Shares Owned After: 4,701 | Ownership: D (Direct)
Footnotes:
[F8] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,280.9800 - $1,281.9700. 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
[Transaction #10]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -308 | Price: $1,282.37
Total Value: $394,970.14
Shares Owned After: 4,393 | Ownership: D (Direct)
Footnotes:
[F9] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,282.0100 - $1,282.9900. 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
[Transaction #11]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -326 | Price: $1,283.55
Total Value: $418,436.16
Shares Owned After: 4,067 | Ownership: D (Direct)
Footnotes:
[F10] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,283.0300 - $1,284.0200. 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
[Transaction #12]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -165 | Price: $1,284.59
Total Value: $211,957.66
Shares Owned After: 3,902 | Ownership: D (Direct)
Footnotes:
[F11] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,284.0400 - $1,285.0300. 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
[Transaction #13]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -32 | Price: $1,285.33
Total Value: $41,130.52
Shares Owned After: 3,870 | Ownership: D (Direct)
Footnotes:
[F12] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,285.0500 - $1,285.9200. 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
[Transaction #14]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -100 | Price: $1,286.57
Total Value: $128,656.70
Shares Owned After: 3,770 | Ownership: D (Direct)
Footnotes:
[F13] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,286.1400 - $1,287.0200. 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
[Transaction #15]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -10 | Price: $1,289.24
Total Value: $12,892.45
Shares Owned After: 3,760 | Ownership: D (Direct)
[Transaction #16]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -57 | Price: $1,291.76
Total Value: $73,630.49
Shares Owned After: 3,703 | Ownership: D (Direct)
Footnotes:
[F14] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,291.3400 - $1,292.0800. 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
[Transaction #17]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -53 | Price: $1,292.66
Total Value: $68,511.17
Shares Owned After: 3,650 | Ownership: D (Direct)
Footnotes:
[F15] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,292.3900 - $1,292.6900. 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
[Transaction #18]
Security: Common Stock
Date: 2026-04-15 | Code: S (Open market sale)
Shares: -50 | Price: $1,294.77
Total Value: $64,738.60
Shares Owned After: 3,600 | Ownership: D (Direct)
Footnotes:
[F16] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,294.7400 - $1,294.8000. 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
--- Derivative Transactions ---
[Transaction #1]
Security: Stock Option
Date: 2026-04-15 | Code: M (Exercise of derivative)
Shares: -3,900 | Price: $0.00
Exercisable: N/A | Expires: 2027-11-08
Shares Owned After: 23,600 | Ownership: D (Direct)
--- Footnotes (Complete Index) ---
F1: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,273.8500 - $1,274.7400. 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
F10: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,283.0300 - $1,284.0200. 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
F11: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,284.0400 - $1,285.0300. 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
F12: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,285.0500 - $1,285.9200. 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
F13: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,286.1400 - $1,287.0200. 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
F14: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,291.3400 - $1,292.0800. 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
F15: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,292.3900 - $1,292.6900. 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
F16: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,294.7400 - $1,294.8000. 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
F2: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,274.9200 - $1,275.7800. 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
F3: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,275.9300 - $1,276.9200. 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
F4: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,276.9400 - $1,277.9300. 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
F5: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,277.9600 - $1,278.9300. 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
F6: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,278.9600 - $1,279.9500. 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
F7: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,279.9800 - $1,280.9700. 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
F8: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,280.9800 - $1,281.9700. 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
F9: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,282.0100 - $1,282.9900. 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
--- Signature ---
/s/ /s/ Rachel L. Quinlan as attorney in fact for Joel Reiss (2026-04-16)
