class A shares tradingAfter looking at the chart of bbd.a , volume reach 1M in one day but less than 10 M in the last 2 weeks. Beaudoin family owns 262M/309M A shares , so they are not about to loose the control of BBD and for an external investors buying twice the price for A shares make no sense.
In my opinion its a redistribution of shares among members of the family for tax purposes , in order words avoiding a big capita gain for new family owners.
That does not mean that bbd.a shares are overvalued ,probably 1$ its the fair price for A and B shares.