Nvidia sheds $220 billion after short run as top stock

It was a swift reversal from earlier in the week, when Nvidia rallied to overtake its megacap peers and claim the pole position. Traders said there weren’t any fundamental reasons behind the two-day selloff at the end of the week, but it does underscore the breakneck pace at which the stock had climbed — almost 200% in the past year alone — and how that ascent now makes it vulnerable to sudden retreats like this one.