SK Hynix's stock surged 27% while IBM's stock plummeted 25% in a day marked by significant volatility in the tech industry. The contrasting movements of the two stocks had a notable impact on the market, with SK Hynix's gain helping to offset IBM's loss. The reasons behind these changes include a possible shift in ai budget and a slowdown in IBM's earnings, although the overall market still saw gains, with major indices rising.