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noway421
Would it be just one rogue order filled? Not sure how after-hours tracking works, but I assume that it won't have a very deep order book, so it would be relatively easy to manipulate it. Given that BRK.A has the highest share price among any stocks, that order book would be even smaller.
shmoogy
It was 4 shares: https://www.nasdaq.com/market-activity/stocks/brk.a/after-ho...

Likely one person that placed a market order

cbhl
That sounds like an expensive mistake -- BRK.B doesn't show anywhere near the same price movements.

One does not simply place a market order during after hours trading...

skzv
I don't think you can place market orders after hours.

It could have been a deliberate limit order to avoid a margin call by raising the mark-to-market value of an account.

wallstshadow
We assume that hedges / banks are moving their money into higher quality assets before the new margin requirements take effect on October 29th.
tertius
Another one, not quite 51% this time.