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Though I do not have a concrete answer, I do have a pretty decent guess.
The simplest way of putting it would be to think of ETFs. Most ETFs have big spreads and don't accurately track the index they are following. I still to this day can't figure out how some of these ETFs stay correlated with the index they are following.
Knowing the above, can it be any different that BRKA does not trade exactly in sync with BRKB? I would say that it is not a big surprise at all, even though I do not know why.
My guess would have to be that it has to do with the liquidity overall (the float, daily volume, share price, etc.)
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Blain Reinkensmeyer
Elite staff member, stocktradingtogo.com
Community manager, covestor.com.
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