Western Digital Stock Tumbles on Report of Toshiba HDD Capacity Expansion

Western Digital (WDC) shares plunged on Friday after a report from Nikkei indicated that competitor Toshiba intends to double its hard disk drive (HDD) manufacturing capacity. The news raised investor concerns about a potential supply glut that could erode the strong pricing power that has benefited HDD makers.

By 11:20 a.m. ET, Western Digital stock was trading at $398.51, a decline of 13.8%, according to a Bloomberg snapshot. The sell-off also hit rival Seagate (STX), which fell approximately 12.5% on the news.

Toshiba's Expansion Plans

According to the Nikkei report, Toshiba plans to invest approximately ¥60 billion (about $400 million) to double its HDD production capacity by fiscal year 2027. The market reaction reflects fears that this increased output could disrupt the current tight supply environment.

As a company focused primarily on the HDD market, Western Digital is particularly exposed to shifts in industry supply and demand dynamics. An increase in market capacity from a major competitor threatens to pressure profit margins across the sector.

Options Market Signals Hedging, Not Panic

Despite the steep stock decline, options market activity suggested a more measured response from traders. Total options volume reached 94,095 contracts, split almost evenly between 46,392 calls and 47,703 puts. This balance indicates significant two-way trading, including hedging and repositioning, rather than a one-sided bearish panic.

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Notable activity included:

• Downside Protection: A large volume of new positions in the November $290 puts, a strike roughly 27% below the current price, pointed to traders buying protection against a deeper decline.
• Rebound Bets: Significant new volume was also seen in January 2027 $450 calls, suggesting some investors are positioning for a recovery.
• Volatility Context: Three-month implied volatility rose only slightly, indicating that options were already priced for the possibility of a large price swing.

Analyst Viewpoint

Some analysts believe the market's reaction may be excessive. Citi analyst Asiya Merchant called the sell-off "overdone" in a note on Friday. Merchant argued that Toshiba's reliance on external suppliers for critical components like media and heads could cap how much new capacity ultimately reaches the market.

The bull case for Western Digital rests on these potential supply chain constraints for Toshiba, while the bear case centers on the risk of margin erosion if the new capacity comes online as planned. Western Digital is scheduled to release its next earnings report later in October.