Why Is Western Digital $WDC Stock Down -9.74% Today? (Find out why any stock moved today on Tickeron.) • Western Digital $WDC shares fell roughly 9.74% to about $417.49, down from a prior close of $462.56. • The primary catalyst was a report that Toshiba plans to double its hard-disk-drive (HDD) production capacity for AI data centers by fiscal 2027. • The expansion, centered on a Philippines facility, raises fears of intensifying competition and eroding pricing power in a market that has underpinned Western Digital's rally. • The selloff was largely isolated to HDD makers — rival STX fell roughly 10% — while the broader tech and memory sectors held up. • After a massive year-to-date run, the stock was especially vulnerable to any sign that the industry's tight supply-demand balance could loosen. $WDC $STX $SNDK $SMCI $IONQ $ANET $RGTI