Micron (NASDAQ: MU) stock fell for a fourth straight day Thursday, continuing a rout that began with Monday's announcement that Chinese DRAM company ChangXin Memory Technologies, or CXMT, has invented "4F square" technology to increase DRAM storage density -- and may soon be coming for Micron's market share. Micron stock is down 2. 8% as of 10: 35 a. m.
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