Micron stock was dropping Friday after memory-chip rivals SKY Hynix and Samsung dragged down South Korea’s benchmark Kospi.

Micron has never before had this kind of market power, and it hasn’t taken long to throw around its newfound muscle.

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Tech stocks were on track to extend their recent slump on Friday as investors continued to fret about soaring memory-chip ...

Consumer sentiment improved from recent record lows in June as gasoline prices moderated, according to the University of Michigan’s monthly survey. The Michigan consumer-sentiment index rose to 49.5, ...