=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-07-15
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: 2026-07-15 | 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: 2026-07-15 | Code: S (Open market sale)
Shares: -10 | Price: $1,195.20
Total Value: $11,952.04
Shares Owned After: 7,490 | 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 $1,195.0300 - $1,195.3200. 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: 2026-07-15 | Code: S (Open market sale)
Shares: -70 | Price: $1,197.85
Total Value: $83,849.57
Shares Owned After: 7,420 | 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 $1,197.5000 - $1,198.4400. 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.
[Transaction #4]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -80 | Price: $1,198.80
Total Value: $95,903.60
Shares Owned After: 7,340 | 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 $1,198.6500 - $1,199.4500. 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.
[Transaction #5]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -156 | Price: $1,200.14
Total Value: $187,222.42
Shares Owned After: 7,184 | 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 $1,199.8400 - $1,200.5700. 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.
[Transaction #6]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -160 | Price: $1,201.32
Total Value: $192,210.90
Shares Owned After: 7,024 | 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 $1,200.8800 - $1,2201.7100. 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.
[Transaction #7]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -116 | Price: $1,202.44
Total Value: $139,483.10
Shares Owned After: 6,908 | 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 $1,202.0100 - $1,202.9200. 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 #8]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -74 | Price: $1,203.80
Total Value: $89,081.39
Shares Owned After: 6,834 | 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 $1,203.0500 - $1,204.0300. 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 #9]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -10 | Price: $1,204.60
Total Value: $12,046.00
Shares Owned After: 6,824 | Ownership: D (Direct)
[Transaction #10]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -30 | Price: $1,206.69
Total Value: $36,200.70
Shares Owned After: 6,794 | 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 $1,206.4600 - $1,207.0900. 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: 2026-07-15 | Code: S (Open market sale)
Shares: -60 | Price: $1,208.51
Total Value: $72,510.43
Shares Owned After: 6,734 | 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 $1,207.9200 - $1,208.9000. 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: 2026-07-15 | Code: S (Open market sale)
Shares: -80 | Price: $1,209.20
Total Value: $96,735.80
Shares Owned After: 6,654 | 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 $1,208.9700 - $1,209.4000. 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.
[Transaction #13]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -30 | Price: $1,210.31
Total Value: $36,309.16
Shares Owned After: 6,624 | 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 $1,210.1300 - $1,210.4500. 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.
[Transaction #14]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -90 | Price: $1,211.50
Total Value: $109,035.10
Shares Owned After: 6,534 | 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 $1,211.1600 - $1,211.9300. 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 #15]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -110 | Price: $1,212.59
Total Value: $133,385.30
Shares Owned After: 6,424 | 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 $1,212.2400 - $1,213.0100. 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.
[Transaction #16]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -170 | Price: $1,213.73
Total Value: $206,333.67
Shares Owned After: 6,254 | 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 $1,213.2600 - $1,214.1500. 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: 2026-07-15 | Code: S (Open market sale)
Shares: -211 | Price: $1,215.13
Total Value: $256,391.67
Shares Owned After: 6,043 | 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 $1,214.6500 - $1,215.6200 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: 2026-07-15 | Code: S (Open market sale)
Shares: -239 | Price: $1,216.22
Total Value: $290,677.61
Shares Owned After: 5,804 | 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 $1,215.6600 - $1,216.6400. 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 #19]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -60 | Price: $1,217.25
Total Value: $73,034.80
Shares Owned After: 5,744 | Ownership: D (Direct)
Footnotes:
[F17] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,216.7200 - $1,217.6700. 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.
[Transaction #20]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -90 | Price: $1,218.22
Total Value: $109,639.80
Shares Owned After: 5,654 | Ownership: D (Direct)
Footnotes:
[F18] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,217.8300 - $1,218.6200. 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 #21]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -90 | Price: $1,219.30
Total Value: $109,736.92
Shares Owned After: 5,564 | Ownership: D (Direct)
Footnotes:
[F19] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,218.9300 - $1,219.6900. 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 #22]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -140 | Price: $1,220.50
Total Value: $170,869.47
Shares Owned After: 5,424 | Ownership: D (Direct)
Footnotes:
[F20] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,220.0600 - $1,221.0400. 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.
[Transaction #23]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -210 | Price: $1,221.53
Total Value: $256,521.24
Shares Owned After: 5,214 | Ownership: D (Direct)
Footnotes:
[F21] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,221.0900 - $1,222.0600. 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 #24]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -60 | Price: $1,222.60
Total Value: $73,355.92
Shares Owned After: 5,154 | Ownership: D (Direct)
Footnotes:
[F22] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,222.1300 - $1,223.1200. 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 #25]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -138 | Price: $1,223.51
Total Value: $168,844.66
Shares Owned After: 5,016 | Ownership: D (Direct)
Footnotes:
[F23] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,223.1500 - $1,224.1200. 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 #26]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -509 | Price: $1,224.62
Total Value: $623,331.89
Shares Owned After: 4,507 | Ownership: D (Direct)
Footnotes:
[F24] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,224.1600 - $1,225.1300. 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.
[Transaction #27]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -153 | Price: $1,225.62
Total Value: $187,519.26
Shares Owned After: 4,354 | Ownership: D (Direct)
Footnotes:
[F25] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,225.2200 - $1,226.1000. 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.
[Transaction #28]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -40 | Price: $1,226.98
Total Value: $49,079.30
Shares Owned After: 4,314 | Ownership: D (Direct)
Footnotes:
[F26] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,226.4000- $1,227.3200. 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 #29]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -210 | Price: $1,227.82
Total Value: $257,842.10
Shares Owned After: 4,104 | Ownership: D (Direct)
Footnotes:
[F27] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,227.5200- $1,228.4600. 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.
[Transaction #30]
Security: Common Stock
Date: 2026-07-15 | Code: S (Open market sale)
Shares: -90 | Price: $1,228.79
Total Value: $110,591.10
Shares Owned After: 4,014 | Ownership: D (Direct)
Footnotes:
[F28] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,228.5700 - $1,229.4400. 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.
--- Derivative Transactions ---
[Transaction #1]
Security: Stock Option
Date: 2026-07-15 | Code: M (Exercise of derivative)
Shares: +3,900 | Price: $0.00
Exercisable: N/A | Expires: 2027-11-08
Shares Owned After: 19,700 | 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 $1,195.0300 - $1,195.3200. 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 $1,208.9700 - $1,209.4000. 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.
F11: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,210.1300 - $1,210.4500. 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.
F12: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,211.1600 - $1,211.9300. 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.
F13: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,212.2400 - $1,213.0100. 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.
F14: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,213.2600 - $1,214.1500. 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 $1,214.6500 - $1,215.6200 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 $1,215.6600 - $1,216.6400. 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.
F17: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,216.7200 - $1,217.6700. 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.
F18: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,217.8300 - $1,218.6200. 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.
F19: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,218.9300 - $1,219.6900. 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.
F2: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,197.5000 - $1,198.4400. 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.
F20: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,220.0600 - $1,221.0400. 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.
F21: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,221.0900 - $1,222.0600. 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.
F22: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,222.1300 - $1,223.1200. 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.
F23: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,223.1500 - $1,224.1200. 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.
F24: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,224.1600 - $1,225.1300. 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.
F25: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,225.2200 - $1,226.1000. 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.
F26: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,226.4000- $1,227.3200. 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.
F27: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,227.5200- $1,228.4600. 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.
F28: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,228.5700 - $1,229.4400. 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.
F3: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,198.6500 - $1,199.4500. 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.
F4: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,199.8400 - $1,200.5700. 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.
F5: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,200.8800 - $1,2201.7100. 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.
F6: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,202.0100 - $1,202.9200. 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.
F7: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,203.0500 - $1,204.0300. 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.
F8: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,206.4600 - $1,207.0900. 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 $1,207.9200 - $1,208.9000. 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 (2026-07-17)
