X0407 4 2023-04-17 0 0001260221 TransDigm Group INC TDG 0001352573 Howley W Nicholas 1301 EAST NINTH STREET SUITE 3000 CLEVELAND OH 44114 1 0 0 0 0 Common Stock 2023-04-17 4 M 0 6500 173.29 A 28047.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2023-04-17 4 S 0 448 749.7282 D 27599.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2023-04-17 4 S 0 574 750.2168 D 27025.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2023-04-17 4 S 0 787 751.6092 D 26238.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2023-04-17 4 S 0 735 752.2778 D 25503.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2023-04-17 4 S 0 1510 753.4904 D 23993.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2023-04-17 4 S 0 1250 754.427 D 22743.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2023-04-17 4 S 0 850 755.3039 D 21893.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2023-04-17 4 S 0 346 756.8642 D 21547.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Stock Option 173.29 2023-04-17 4 M 0 6500 0.00 D 2019-09-30 2024-11-13 Common Stock 6500 117190 I W. Nicholas Howley Family Trust u/a/d 4/23/99 The exercise price has been adjusted for dividends declared since August 1, 2022. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $748.91 - $749.90. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $749.93 - $750.90. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $750.93 - $751.92. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $751.93 - $752.92. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $752.93 - $753.91. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $753.93 - $754.92. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $754.93 - $755.90. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $756.34 - $757.19. 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. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2022. /s/ Amy Paszt as attorney-in-fact 2023-04-19