In order to attend the Annual Meeting, stockholders will be required to register in advance at http://viewproxy.com/allisontransmission/2020/. Beneficial owners whose shares are held through a bank, broker or other nominee must provide a copy of a legal proxy that they have obtained from their bank, broker or other nominee when they register. Registration will close at 11:59 p.m. Eastern Time on Sunday, May 3, 2020.

If properly registered, stockholders will be able to log into the virtual meeting platform on Wednesday, May 6, 2020 by visiting http://viewproxy.com/allisontransmission/2020/VM and providing the log-on information obtained during the registration process. During the Annual Meeting, stockholders may vote and ask questions about the matters being voted on at the meeting by following the instructions available on the virtual meeting website.
 
Online access to the Annual Meeting will begin at 12:45 p.m. Eastern Time on May 6, 2020 to allow time to log-in. Stockholders are encouraged to access the Annual Meeting in advance of the designated start time.