What Changed For Western Digital Stock, And What Did Not?
Western Digital (WDC) stock fell 10.2% on Friday, October 2, 2026, while the S&P 500 gained 0.7%. News coverage that day tied the fall to Toshiba, a smaller rival in hard disks. Toshiba’s planned expansion raises the risk of lower prices, a report said a day later. So what part do prices play in Western Digital’s profit?
What Western Digital Charges And Spends Per Terabyte
On the fiscal Q4 2026 call, held August 5, 2026, management named three drivers: favorable pricing, a shift to higher-capacity products and disciplined manufacturing. The measure to watch is the price per terabyte, which is what a customer pays for each unit of storage.
Management said the blended average price per terabyte was up by a high-teens percentage from a year earlier, after a high-single-digit rise the quarter before. In fiscal Q4 2026, the cost of each terabyte was down about 8% from a year earlier. So Western Digital collected more for each terabyte while spending less on it, and the difference went to profit.
A rival’s expansion puts the higher prices at risk, not the lower costs. That rival is the smaller company: Toshiba holds 17% of the hard disk market against 40%-plus for Western Digital, according to a report published October 2. And the selling was not about Western Digital alone, because Seagate Technology, a peer, also fell 10.2% that day.
How Much Has Western Digital’s Margin Risen?
Western Digital’s gross margin over twelve months has risen from 18.9% two years ago to 49% now. It was 39% a year ago. For fiscal Q4 2026 alone, management reported a quarterly gross margin of 54.4%, up 13.1 percentage points from a year earlier.
That margin is a large part of what shareholders are paying for. Western Digital trades at 11.3 times its sales, against 3.0 for the S&P 500, and the price appears to assume the margin lasts. That may be why a rival’s plans mattered so much to the shares on October 2.
Western Digital’s Contracts And Forecast Stand Where They Did
The fall on October 2 came without any new figures from Western Digital, so its latest forecast is still the one from the August 5 call. Management guided fiscal Q1 2027 revenue to $4.1 billion, plus or minus $100 million, against the $3.75 billion it reported for Q4. Q4 revenue was up 43.8% from a year earlier. Management also forecast a gross margin of 55% to 56% for that same quarter, which it has not yet reported.
Cloud customers, who buy its high-capacity hard disks, made up 89% of Western Digital’s revenue in fiscal Q4 2026. Its largest customers buy under long-term agreements, and management said it keeps pricing predictable for them. One of those agreements runs through calendar 2029.
Western Digital’s next report covers fiscal Q1 2027, its September quarter, which came before any rival expansion. A gross margin below the 55% to 56% forecast could be a sign that prices were weakening already. But price is only one of the three drivers management named.
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