IBM shares collapsed 26% in US trading on Tuesday, marking the most severe single-day decline for the technology giant since the 1987 market crash.
The sell-off erased approximately a quarter of the company's market capitalization in a matter of hours, reflecting a sharp repricing of investor sentiment following a stark warning from the chief executive.
The market reaction was triggered by the release of disappointing preliminary second-quarter results, which failed to meet expectations and prompted the CEO to issue a cautionary outlook.
Investors reacted swiftly to the guidance, driving the stock to levels not seen in decades.
The magnitude of the drop underscores the market's sensitivity to any signs of weakness in the company's core consulting and hardware segments.
This event represents a significant shift for IBM, which has long been viewed as a stable, albeit slower-growing, enterprise technology provider.
The severity of the decline suggests that investors are now questioning the sustainability of the company's current strategy and its ability to maintain margins in a competitive landscape.
The sell-off also highlights the broader risks facing legacy IT firms as they navigate the transition to cloud-based and AI-driven services.