$Seagate Technology PLC(STX)$ explodes 18% pre-market. Is the "Structural New Era" of AI storage here? One-sentence summary: Q3 earnings demolished expectations + Q4 guidance dazzled the market + CEO announced 2027 capacity is fully sold out. Seagate is transforming from a "cyclical stock" into an "AI infrastructure must-have." This isn't just a solo rally for STX—the combined market cap of the four storage giants surged by $60 billion after-hours. Company After-Hours/Pre-Market Gain $Seagate Technology PLC(STX)$ +18% $Western Digital(WDC)$ +10%+ $SanDisk Corp.(SNDK)$ +4-5% $Micron Techn
Micron Surges 5%+ to Lead Semiconductors: Can Rally Hold?
MU jumped +5.6% to ~$524, named alongside NVDA and SNDK as a top market winner, driven by sustained HBM demand from AI server buildouts triggering a valuation re-rating. Tight MU HBM3e supply and accelerating data center expansion confirmed by multiple cloud vendors continue to underpin the memory bull cycle. However, industry warnings are mounting: the semiconductor index's 18-session winning streak has ended, and profit-taking pressure is building at elevated levels. If Big Tech earnings disappoint on HBM procurement outlook this week, can Micron's $500+ valuation stand on its own?
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