Western Digital (WDC) shares fell in pre-market trading on September 28, 2026, alongside SanDisk, Seagate and Micron. Investors were concerned about future demand for artificial intelligence infrastructure.
Those concerns reportedly followed news that OpenAI is pausing work on some of its more advanced AI models. Investors worry the move could slow spending on data-center systems and components, including products made by Western Digital, that are used to run advanced AI models.