Apple knocks on China's memory products. Two suppliers benefit as well.

Chinese chip stocks are booming. The trigger is a report that Apple is testing DRAM memory from the state-supported manufacturer ChangXin Memory Technologies (CXMT) for its devices sold in China. There is more than just a single customer behind this. CXMT has risen to become the fourth largest DRAM producer in the world. A test with Apple would be a quality endorsement for China's memory supply chain, despite the US restrictions. For investors outside of China, a different question arises. Who supplies the equipment for this expansion? CXMT is...