Why is International Business Machines (IBM) stock down today?

IBM shares collapsed roughly 25%, falling from a previous close of $290.23 to $217.07 — touching a day-low of $213.22 — in one of the most dramatic single-session declines in the company's history. A Motley Fool report published on July 15 titled 'Why IBM Stock Crashed Today' directly attributes the move to a company-specific catalyst, though the precise disclosure (such as an earnings pre-announcement, guidance cut, or other negative development) is described in that article rather than in the structured grounding data available here.

The magnitude of the drop — more than $73 per share wiped off in a single session — stands in sharp contrast to the broader market backdrop, where the S&P 500 gained 0.38% and the tech-heavy QQQ ETF (which tracks the Nasdaq-100) rose 1.12% on the same day. That divergence underscores that the selling pressure was entirely IBM-specific rather than a reflection of any broad market weakness or sector rotation.

IBM's next scheduled earnings report is set for July 22, just days away. The proximity of that date raises the possibility that any pre-earnings disclosure — such as a revenue warning or updated guidance — could be the mechanism behind today's move, though that connection is not explicitly stated in the available grounding data. Last quarter, IBM reported earnings per share of $1.91 against an estimate of $1.81, and revenue of $15.92 billion, with annual revenue growth of 9.5% and earnings growth of 14.2%.

As of the close, IBM's market capitalization stood at approximately $204 billion, reflecting the sharp reduction in share price. The stock's trailing price-to-earnings ratio (P/E, the share price divided by the past year's earnings per share) sits at 25.7, while the forward P/E — based on expected future earnings — stands at 16.2, a spread that may reflect the market now pricing in reduced earnings expectations following today's event.