Covid-related factory closures and declining demand for 5G handsets in China are likely to put pressure on sales in the near term for US companies making chips for Chinese smartphones, a Wall Street firm says. The news is another negative for semiconductor stocks. X In a note to customers Monday, Mizuho Securities analyst Vijay Rakesh highlighted multiple headwinds for Chinese handset makers and their component suppliers in the second quarter. Major Chinese smartphone makers include Xiaomi, Oppo and Vivo. Together, those three companies accounted for 33.4% of global smartphone shipments in 2021, says research firm IDC. Headwinds in China include...