Why Micron Stock Was Up and Down Today

Micron Technology (MU) closed down 4.74% Friday after whipsawing through a 6.4% intraday gain, caught between competing forces as earnings season collided with rising rates. The stock surged early on strong results from Apple and Amazon, signaling continued robust spending on memory chips, but reversed as interest rates climbed to 19-year highs and dragged down growth names.

The session encapsulated the tension facing MU bulls: fundamentals point to sustained strength from the memory supply crunch, but valuation has stretched to levels that leave little room for error in a higher-rate environment. The Motley Fool flagged the stock as "too rich" at current levels despite the tailwind from chip demand.

Micron's rally attempt was fueled by optimism that hyperscaler capital expenditure—critical to memory demand—remains intact. Apple and Amazon's willingness to invest in infrastructure underscored that theme. But the macro backdrop won out, with investors rotating away from premium-multiple semiconductor plays as the cost of capital rises.