X0306 4 2019-08-23 0 0001260221 TransDigm Group INC TDG 0001352573 Howley W Nicholas 1301 EAST NINTH STREET SUITE 3000 CLEVELAND OH 44114 1 1 0 0 Exec. Chairman of the Board Common Stock 2020-12-14 5 G 0 E 8262 0.00 A 8262 I The Howley Family Foundation Common Stock 2019-08-23 4 J 0 1501.862 534.04 A 28236.862 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2020-01-07 4 J 0 1572.651 583.54 A 29809.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Common Stock 2020-12-14 5 G 0 E 8262 0.00 D 21547.513 I W. Nicholas Howley Family Trust u/a/d 4/23/99 Shares were acquired pursuant to a broker automatic dividend reinvestment feature. Mr. Howley has disgorged profits related to the acquisitions on August 23, 2019 and January 7, 2020 and matched sales in excess of the purchase prices reported herein to the Company pursuant to Section 16(b). The total amount received by the Company from Mr. Howley was $288,380.03. Halle Terrion as attorney in fact for W. Nicholas Howley 2021-03-12