IBM Stock Plummets Amid Mainframe Revenue Crash

IBM's stock has taken a hit since the start of the year, with shares shedding roughly a quarter of their value. The worst trading day in IBM's history occurred when it blindsided investors with a preliminary profit warning in mid-July. Shares cratered 25% in a single session, surpassing even the infamous crash of October 19, 1987.

The official report confirmed the damage: adjusted earnings per share of $2.93 against expectations of $2.97, and revenue of $17.16 billion versus the $17.58 billion forecast. The immediate fallout has left the stock trading 14.54% below its 50-day moving average and 16.24% under the 200-day average.

The mainframe puzzle lies at the heart of the sell-off, with IBM's Z-series mainframe revenue collapsing 42% in the quarter. Management insists that this is not a structural crisis in a legacy business, but rather a one-time capital reallocation by customers. CEO Arvind Krishna notes that there's no evidence of customers abandoning the mainframe platform.