X0306 4 2018-02-07 0001411207 Allison Transmission Holdings Inc ALSN 0001543489 Dewey Lawrence E. ONE ALLISON WAY INDIANAPOLIS IN 46222 0 1 0 0 Chairman and CEO Common Stock 2018-02-07 4 A 0 25168 0 A 286747 D On February 19, 2015, the reporting person was granted performance-based restricted stock, with the number of restricted shares earned to be determined based on the extent to which certain performance conditions were met for a performance period of 2015-2017. As determined on February 7, 2018, based on the Company's actual performance for 2015-2017, the reporting person earned 25,168 restricted shares. Earned restricted shares will vest on February 19, 2018. /s/ Eric C. Scroggins, attorney-in-fact 2018-02-09