X0508 4 2026-01-08 0001260221 TransDigm Group INC TDG 0001431675 Stein Kevin M 1350 EUCLID AVE SUITE 1600 CLEVELAND OH 44115 true false false false true Common Stock 2026-01-08 4 M false 17373 342.31 A 25531 I Fortuna Trust dated June 1, 2018 Common Stock 2026-01-08 4 S false 6384 1405.3006 D 19147 I Fortuna Trust dated June 1, 2018 Common Stock 2026-01-08 4 S false 1278 1406.7156 D 17869 I Fortuna Trust dated June 1, 2018 Common Stock 2026-01-08 4 S false 2722 1407.4564 D 15147 I Fortuna Trust dated June 1, 2018 Common Stock 2026-01-08 4 S false 5239 1408.4395 D 9908 I Fortuna Trust dated June 1, 2018 Common Stock 2026-01-08 4 S false 480 1409.5663 D 9428 I Fortuna Trust dated June 1, 2018 Common Stock 2026-01-08 4 S false 930 1410.6495 D 8498 I Fortuna Trust dated June 1, 2018 Common Stock 2026-01-08 4 S false 340 1413.17 D 8158 I Fortuna Trust dated June 1, 2018 Stock Option. 342.31 2026-01-08 4 M false 17373 0 D 2025-09-30 2030-11-11 Common Stock 17373 50627 I Fortuna Trust dated June 1, 2018 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 $1,405.0000 - $1,405.9900. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,406.0000 - $1,406.9950. 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 $1,407.0000 - $1,407.9150. 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 $1,408.1500 - $1,409.1100. 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 $1,409.1600 - $1,410.0800. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,410.4600 - $1,411.4350. 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. /s/ Rachel Quinlan as attorney in fact for Kevin Stein 2026-01-09