Intel shares plunged nearly 26% at the open after Q4 earnings guidance missed expectations. According to MSX.COM data, Intel's stock price fell nearly 26% after the market opened. The company reported third-quarter revenue of $16.5 billion, a 21% year-over-year increase, with non-GAAP earnings per share of $0.52. However, the company projects fourth-quarter non-GAAP earnings per share of only $0.25, with gross margin expected to drop to 38%, down from 44.1% in the third quarter, raising concerns about its earnings outlook.