IBM's stock just had the biggest single-day plunge since 1987, with CEO Arvind Krishna accepting that the company had ...

CEO Arvind Krishna said in his letter to investors that IBM had underestimated the "magnitude" of clients changing spending habits.

IBM's shares tanked 25 per cent on Tuesday, putting the stock on track for an even steeper single-day decline than it suffered during the 1987 "Black Monday" crash. ⁠ ...

IBM shares just suffered their biggest single-day drop since 1987, and CEO Arvind Krishna acknowledged that the company "stumbled" this quarter. But what happened? Here is Krishna's full letter ...