On September 17, Western Digital rose 3.07% in pre-market trading, trading at 429.01 USD/share, with turnover of $5.587 million, extending the prior session's momentum as storage stocks rallied broadly.

On the news front, Citi released a major research report highlighting that \"Continual Learning\" — a paradigm allowing AI models to absorb new knowledge during operation — will be the core theme driving memory demand over the next five years. The bank projects global memory capital expenditure (DRAM + NAND) will surge 46.5% year-over-year to $80.4 billion in 2027, yet warned that even this massive investment will fail to close the supply-demand gap due to lengthy capacity build timelines and HBM production constraints squeezing conventional DRAM output. Citi estimates the HBM supply shortfall at approximately 21% in 2027, potentially widening to 36% by 2028, with the broader memory shortage extending through 2031. Within the sector, peers also advanced in pre-market trading, with Hewlett Packard Enterprise up 2.98%, Seagate Technology up 2.52%, SanDisk up 2.11%, and Dell Technologies up 1.59%.

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