berkshire shares barely have any liquidity during normal hours.. there's not gonna be any after hours.
yes they are. i have been short b on an imbalance before. i have never traded a since it trades in 10 lots but i know people who do and they are long and short it all the time.
Not shortable? What nonsense. As of 04/15/08 the short interest in BRK.A is 2,828 shares and in BRK.B is 39,238 shares.
brk.a trades in 1 share round lots, and both a and b are almost always available to short...my coach trades both brk.a and brk.b almost everyday (long and short)....the misinformation on this board is staggering at times