Semiconductor shares tumbled into the weekend, with the Philadelphia Semiconductor Index closing Friday at 7,998.47, down roughly 3.9%. KLA Corp, a key player in chip equipment, plunged 15.2%. The broader market slipped as investors digested President Donald Trump’s pick of former Federal Reserve Governor Kevin Warsh for Fed chair, alongside a hotter-than-forecast producer-price report. Adding to the pressure, Apple flagged rising memory-chip costs weighing on its profits.