On October 2, Western Digital fell 10.01% in regular trading, trading at approximately $418.65 per share, with turnover of $1.235 billion. The sharp decline was triggered by reports that Toshiba plans a major expansion of its HDD business targeting AI data centers.

According to market reports, Toshiba intends to invest approximately 600 billion yen to expand its production base in the Philippines, aiming to double its mechanical hard disk drive capacity by fiscal year 2027. The plan also includes introducing a new product line with per-disk storage capacity up to 40% higher. Toshiba's medium-term goal is to raise its HDD market share from just over 10% currently to 30%, marking the company's first large-scale investment in HDD operations in nearly five years.

The market is concerned that a significant supply-side expansion could disrupt the existing supply-demand balance in the three-player oligopoly structure, undermining product pricing power across the sector. Peer Seagate Technology fell over 14% on the same session, while the broader storage sector came under heavy selling pressure. Within the Technology Hardware, Storage and Peripherals sector, SanDisk fell 3.32%, while Apple rose 0.72%, Dell Technologies rose 2.25%, and Hewlett Packard Enterprise gained 4.09%.

(The above content is based on publicly available market information, generated by a program or algorithm, and is intended solely as a stock movement alert. It does not constitute investment advice or a basis for trading decisions.)