Shares of Seagate Technology tumbled 5.6% to $837.80 on Tuesday, erasing roughly $10 billion in market value, after Bloomberg reported the company is locked in a bidding war with Toshiba to acquire TDK's hard-disk-drive magnetic-head unit — a deal expected to be worth as much as several billion dollars . The broader market was green, with the S&P 500 up 0.5% and the Nasdaq up 0.7% , underscoring that this sell-off is company-specific.
• TDK Makes the Only Independently Supplied Component That All Three HDD Makers Need
TDK is the only independent maker of HDD magnetic-recording heads and currently supplies Seagate, Toshiba, and Western Digital . These tiny parts read and write data on spinning disks — without them, no hard drive works. Toshiba relies entirely on TDK for supply, while Seagate and Western Digital primarily manufacture in-house . Whoever wins would gain enormous leverage over competitors' supply chains, which is precisely why the market is nervous about the price tag.
• Toshiba's Denial Leaves the Deal in Limbo Hours after Bloomberg's report, a Toshiba spokesperson told Bloomberg that the report is "inconsistent" with the company's understanding of the situation . Japan Industrial Partners, Toshiba's principal backer, also said the article is inconsistent with its understanding . This denial doesn't kill the deal — but it injects enough ambiguity to keep investors from pricing in any strategic upside.
• Toshiba's Aggressive Expansion Already Had Seagate on the Defensive
Toshiba holds just over 10% of HDD capacity today and is targeting a medium-term share of around 30% , backed by approximately $380 million to expand its HDD manufacturing facility in the Philippines . Seagate and Western Digital shares fell about 14% and 13% on that news last week. The TDK bid now layers acquisition risk on top of competitive risk — a costly double hit.
• Seagate Can Afford a Deal, but Shareholders Fear Overpaying
Seagate generated revenue of approximately $12.2 billion in fiscal 2026 with operating cash flow of $3.7 billion . A multibillion-dollar acquisition is financially feasible but would consume a large share of annual cash flow or require debt — this from a company that only recently reduced its outstanding debt by $1.4 billion . The stock's 11.4% decline from last week's $945.57 close signals Wall Street's worry that Seagate may be forced into an expensive bidding war for a component it already partly makes itself — precisely because letting a rival win could be worse.