For those curious as to the different share classifications of ATD, I'll post it here.
Class A and Class B shares are provided for a variety of reasons, by companies other than ATD. We see stocks like Canadian Tire trading under CTC.A, Rogers trading under RCI.B, Andrew Peller trading under ADW.A etc.
The different classes of shares are typically to give holders of one particular share class more voting rights. This is a very generic example, but you could have a class A share count for 50 votes, while a class b share counts for 1 vote.
Companies will do this so that it has more control over the overall decisions of the company. For example, Couche-Tard may assign more Class A shares to their directors, board members, CEO etc so that when push comes to shove, their say has more impact on voting decisions.
You'll almost always see significantly more volume in the class that retail investors like to buy. So for example, ATD.A has volume of 30,000 today. ATD.B has volume of 1.1 million. If you're ever wondering what class of share you should buy, this is a very telling indicator.