On September 8, Micron Technology rose 3.22% overnight, trading at $1,052.01/share, with turnover of $114 million. The rally was driven by a broad surge in storage chip stocks following OpenAI's release of its flagship Astra model, which reignited market enthusiasm for AI computing infrastructure and memory demand.

The launch of Astra has refocused investor attention on the storage bottleneck in AI infrastructure. Analysts noted that as frontier model capabilities continue to advance, demand for HBM and DRAM is expected to widen further, positioning these products as a key theme in AI infrastructure investment. Bank of America projected that September DRAM and NAND spot prices still have 10% to 20% upside, with supply fulfillment rates remaining below 50%.

Simultaneously, Micron's plan to nearly double its HBM monthly production capacity to approximately 100,000 wafers by year-end continued to underpin sentiment. The company is accelerating mass production of HBM4 12-layer products targeting NVIDIA's Vera Rubin architecture, aiming to lift its current 18% HBM market share closer to rivals SK Hynix and Samsung. The broader storage sector rallied in tandem, with the Roundhill Memory ETF up 2.71% and SanDisk gaining 2.62%.

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