Micron stock has fallen, with the decline attributed to the poor performance of its rivals SK Hynix and Samsung, which have also dragged down the KOSPI index. The drop in semiconductor stocks, including those related to AI memory and chips, appears to be part of a broader sell-off. The extent of the decline and its impact on the market are still being reported, with some outlets noting a pre-market drop of over 5% for Micron.