Why Western Digital (WDC) fell 6.35%
Western Digital (WDC) fell 6.35% on October 2, 2026 — Toshiba AI storage push pressures WD margins.
What happened
Toshiba announced a significant increase in AI storage output, expanding HDD and SSD capacity aimed at data-center and AI infrastructure markets where Western Digital competes.
Why it moved
More supply in the AI storage segment pressures pricing and erodes Western Digital's margin profile; while DRAM and HBM remain tight, HDD and flash storage—WDC's core businesses—face near-term oversupply as multiple…
Why it matters
AI Memory theme: the three-month weakness in storage stocks masks a bifurcated market—DRAM and HBM shortage supports pricing, but NAND flash and HDD oversupply hurts storage incumbents like WDC and Seagate, creating…
What would break the thesis
If Toshiba's production increase is smaller than feared, or if hyperscaler demand absorbs the additional supply faster than expected, WDC could stabilize; conversely, further supply announcements would compound downside.