Why Is Seagate (STX) Stock Down 10.21% Today, Oct 2? Toshiba’s 30% Market-Share Goal Raises Competition Concerns

Seagate (STX) dropped 10.21% after reports that Toshiba plans major HDD capacity expansion and targets ~30% market share, prompting concerns about future supply, intensifying competition, and potential erosion of industry pricing power in AI data-center drives. The move appears sector-driven rather than company-specific, but it raises uncertainty around medium-term margins and contract leverage, keeping storage equities sensitive to further details on Toshiba's timeline and capacity ramp.