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I have been puzzled by the end of trading day difference between the prices of an A share and 1500 B shares that occurs sometimes. The latest example of this was yesterday,11/22/2013 with the A share closing at $174,850 and 1500 B shares at $175440. I believe I have found one very interesting reason that could sometimes account for this. Laszlo Birinyi was interviewed by Bloomberg on U.S. stocks, strategy and picks (Friday,Nov.22). In the interview he said that he was basically a trader and he liked to trade Berkshire A shares making $1000 or more for a very short trade. ( this interview can be found on the BRKA page of ) It may be that the difference near the close between A and B share prices is the selling pressure of A shares by these day traders. Of greater concern is that the significantly cheaper A shares could lead to A shares being bought and at the same time 1500 B shares sold for each A share bought. The A shares are freely converted to B shares to fulfill the sale of the B shares and the difference in price between B and A shares is profit. This would lead to a decrease of A shares which I think would be a negative for Berkshire as a company.
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