X0609 4/A 2026-07-15 2026-07-16 false 0001260221 TransDigm Group INC TDG 0001656109 Reiss Joel false 1350 EUCLID AVE SUITE 1600 CLEVELAND OH 44115 false true false false Co-Chief Operating Officer true Stock Option 284.97 2026-07-15 4 M false 3900.00 0.00 D 2021-09-30 2027-11-08 Common Stock 3900.00 11900.00 D This Form 4/A amends the Form 4 originally filed on 07.16.2026 to correct the reporting of the transaction in Table II, which was inadvertently reported as an acquisition ('A') rather than a disposition ('D'). No other changes have been made to the original filing. /s/ Rachel L. Quinlan as attorney in fact for Joel Reiss 2026-07-21