** Shares of memory chip maker Micron Technology MU.O rise 5.7% to $394.36
** Micron CFO Mark Murphy says HBM4 has entered high-volume production and shipments to customers have begun; new NAND fab on track
** "We achieved getting our HBM share close to our DRAM share in the market," Murphy said during Wolfe research conf
** Co believes margins to expand in second and third quarter
** Stock rose more than 35% in 2025
(Reporting by Kritika Lamba in Bengaluru)
((Kritika.Lamba@thomsonreuters.com))
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