Micron's record run looks like the top of a cycle, with retail chasing narrative rather than inputs. It doubled from $500B to $1T in 48 trading days, the fastest ever, after an 850% gain in 12 months and a UBS target hike from $535 to $1,625. JPMorgan's Jamie Dimon named Micron as a sign of market exuberance, also flagging record-low credit spreads and possible 4% inflation. Earnings are growing, with a 0.07 PEG ratio, but stocks that double this fast get repriced violently when rotation comes. x.comÂ