AI boom drives 42 US stocks to double, SanDisk tops 4,000% gain
The AI infrastructure surge has pushed 42 stocks in Morningstar’s US Large‑Mid Index past the 100% YTD mark, with SanDisk soaring over 4,000% and Bloom Energy up more than 1,000%. Analysts warn most lack lasting competitive edges, so a pullback in AI spending could spark steep losses.