Thanks That's referring to data feeds that come thru the NASDAQ, not the trading itself which is on the NYSE.
Last I read, BRK equity was about 40% Class A shares and 60% class B, which have a ratio of 1500 to 1. So there's plenty of class A. Much class A is in the hands of institutions, early BRK investors and Warren Buffett himself. BRK-A has a lot more voting power than BRK-B.
Buffett regularly surveys his shareholders and they vastly prefer things the way they are... high priced shares and no dividend, although that might change after Buffett who is 90 years old.