Investors are nervous about the massive AI spending from the tech giants and whether that will pay off. INTC shares plunged about 25.60% in Friday’s pre-market trading, putting the stock on course for its worst single-day decline in more than two years, even as CEO Lip-Bu Tan. Analysts cited weaker PC demand, manufacturing constraints and delayed supply improvements in cutting their price targets and downgrading INTC shares after Intel’s third-quarter results.