X0508 4 2026-02-02 0001260221 TransDigm Group INC TDG 0001431675 Stein Kevin M 1350 EUCLID AVE SUITE 1600 CLEVELAND OH 44115 true false false false true Common Stock 2026-02-02 4 S false 1421 1431.4599 D 17812 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 1364 1432.5282 D 16448 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 3093 1433.4578 D 13355 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 1462 1434.6305 D 11893 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 810 1435.6275 D 11083 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 1497 1436.4265 D 9586 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 428 1437.3994 D 9158 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 270 1438.9134 D 8888 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 720 1439.5622 D 8168 I Fortuna Trust dated June 1, 2018 Common Stock 2026-02-02 4 S false 10 1440.48 D 8158 I Fortuna Trust dated June 1, 2018 Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,431.0500 - $1,431.9900. 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 $1,432.1000 - $1,432.9400. 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 $1,433.1200 - $1,434.0800. 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 $1,434.1400 - $1,435.1200. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,435.1400 - $1,436.1350. 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 $1,436.1400 - $1,437.0900. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,437.1800 - $1,438.0400. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,438.1800 - $1,439.1400. 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 $1,439.2000 - $1,440.1700. 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. Due to a 30-line item limitation in Table 1, this is the second of two Form 4s filed by the reporting person for this transaction. /s/ Rachel Quinlan as attorney in fact for Kevin Stein 2026-02-03