It is not really down (obviously) but its price overflowed the range for a 32 bit unsigned integer and so, from what I understand, at least some software has apparently problems to display the price properly.
Yes, various other stories about it. I find it amusing that some finance sites like Yahoo Finance and ETrade (those are the only ones I checked) are correctly displaying the price at 431998 or thereabouts, and some are not. Different APIs in use by the different sites? Or are they special casing all stocks with a share price above 400k? (yeah, there's only one)
I am going to guess that a few weeks back there was a scramble at various brokerages to ensure that they do not allow people to buy BRK.A at an absurdly low price, and it is all a huge mess while they wait on NASDAQ to correct the error.
