WDC vs STX — which stock performed better?

Western Digital Corporation (WDC) versus Seagate Technology Holdings plc (STX), Information Technology, on 2026-10-05.

Result

Western Digital Corporation (WDC) performed better on 2026-10-05. WDC moved 3.780%, STX moved 2.050%.

Why these two companies

Western Digital and Seagate, the two dominant makers of the hard-disk drives powering the AI data-center storage boom, both sold off sharply after reports surfaced that rival Toshiba plans to roughly double its own HDD production capacity, threatening the tight-supply thesis that had driven both stocks to multi-year highs. The story broke Friday, October 2, 2026, hitting both names with double-digit percentage declines in the same session, reigniting investor debate over whether the AI-storage rally has further room to run. With both companies' fiscal first-quarter earnings reports expected in the back half of October 2026, the session sets up a direct test of which HDD rival investors trust more to absorb a potential supply shock.

The research

Western Digital makes computer storage hardware, including both spinning hard drives and flash memory chips, used in everything from laptops to giant cloud data centers. Seagate also makes hard drives, but it focuses more heavily on the big, high-capacity drives that large cloud and AI companies buy in bulk. One reason some investors like Western Digital right now is that its stock trades at a lower price relative to its profits after the recent pullback, and it sells a wider mix of storage products. One reason some investors like Seagate is that it has been first to roll out a newer hard-drive technology that big cloud customers have been buying aggressively, which has fueled faster stock gains this year. The key thing to keep in mind is that both stocks fell sharply on the very same piece of news about a competitor — a company neither Western Digital nor Seagate controls — so their price moves have been tied together lately rather than driven by news specific to either one.