Western Digital Peer Seagate Falls on AI Chip Selloff

What happened

Seagate Technology Holdings shares fell during a sector-wide selloff in AI and memory chip stocks. The decline followed heightened concerns about SK Hynix's earnings outlook, which raised questions about the durability of AI-related demand and memory pricing. Seagate, which had posted strong recent performance with revenue up 44% year-over-year to $3.11 billion in fiscal Q3 2026 and gross margin reaching 47%, saw its stock drop 7.6% over the past month despite longer-term gains. The selloff reflects renewed investor caution about cloud capital expenditure cycles, potential inventory buildup, and the sustainability of AI infrastructure spending that underpins demand for Seagate's high-capacity Mozaic 4+ drives.

Why it matters

Western Digital operates in the same duopoly HDD market as Seagate, serving hyperscale cloud and data center customers with mass-capacity storage solutions. A sector-wide reassessment of AI infrastructure demand and cloud spending directly affects Western Digital's business outlook, as both companies compete for the same customer base and rely on similar demand drivers. Concerns about cloud providers rethinking capital expenditure timing, potential inventory overhang, and the pace of AI workload integration could pressure Western Digital's revenue and margin expectations in the near term, just as they have for Seagate. The sharp sentiment shift shows how quickly investor confidence in storage demand tied to AI can change when macro or sector-specific concerns emerge.

Bigger picture

The HDD market is effectively a duopoly, with Seagate holding 40.8% market share and Western Digital controlling 42.3%, making both companies highly interdependent on the same demand trends. Hyperscale cloud customers are the primary growth driver for mass-capacity storage, as AI infrastructure and data center buildouts require low-cost, high-density storage solutions that HDDs provide more economically than NAND flash. However, the sector is now facing questions about whether AI-related capital spending is running too hot, with analysts flagging uncertain cloud capex cycles and trimmed outlooks for AI workload integration. The recent volatility highlights how sentiment-driven the storage sector can be, particularly when tied to AI infrastructure narratives that are still developing and subject to rapid reassessment.

What to watch

Watch for updates on cloud provider capital expenditure plans and any commentary about inventory levels or demand timing for high-capacity storage. Monitor Western Digital's own outlook and customer commentary around AI and data center storage needs. Pay attention to broader memory sector trends, particularly NAND and DRAM pricing, which can signal shifts in AI infrastructure spending. Also track whether hyperscale customers adjust their storage procurement schedules or shift budget allocations in response to concerns about AI workload growth rates.