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Stock Market 9 February 2026
Micron’s stock surged 8.7% to $1,133.99 at Thursday’s close and gained 15.5% for the holiday-shortened week, with investors focused on next week’s earnings as a test for the AI memory rally. Amkor Technology rose 4.7% to $90.46 after TSMC signed a 10-year deal for advanced packaging and testing in Arizona. Rocket Lab ended at $107.24, down 0.69% Thursday, but up 4.7% for the week following an analyst upgrade and index inclusion. Marvell climbed 7.27% to $310.58 and is set to join the S&P 500, with KeyBanc raising its price target to $385. IonQ closed at $56.55, up 3.4% Thursday but down 2.2% for the week. The S&P 500 rose 0.93%, Nasdaq 2.43%, and Dow 0.71% for the week. Intel jumped 10.6% after news of a partnership with Apple for U.S. chip design and manufacturing. Teradyne rose 7.19% to $437.92 and will join the Nasdaq-100, with AI-driven test demand as a key driver. Sandisk closed at $2,184.75, up 11.54%, as the Philadelphia semiconductor index gained 7% for the week. Astera Labs jumped 11.31% to $417.07 and will also join the Nasdaq-100, driven by AI infrastructure demand. Nebius rose 2.06% to $286.69 and is set to be added to the Nasdaq-100 alongside CoreWeave. Vertiv climbed 4.87% to $333.05, up nearly 10% for the week, with AI data-center cooling as a focus. Redwire fell 5.1% for the week, as investors weighed backlog growth against a $500 million share program. Plug Power rose 7.55% to $2.85, up 3.3% for the week. Aditxt soared 127.27% to $0.0100 on heavy volume, with insider sales reported. PayPal gained 1.02% to $42.51, up 2.4% for the week.