Sandisk stock drops 5% as AI storage jitters outweigh a Mizuho upgrade

What Happened to Sandisk Stock

Trading in Sandisk was heavy, with volume reaching approximately 7 to 9 million shares. The stock touched a session low near $1,584 before settling. Despite a vote of confidence from Mizuho, the firm kept its Outperform rating and raised its price target from $1,875 to $2,050.

The Pressure

Two forces drove the selling: mixed economic signals and uncertainty about how fast AI infrastructure buildouts will keep moving. A batch of reported pauses in OpenAI's model training has amplified the uncertainty, as training large AI models eats enormous amounts of data, and that data has to live somewhere.

How Sandisk Got Here

Sandisk's stock had surged more than 1,100% over the trailing 12 months through early October 2026. The company posted substantial revenue and margin growth in recent quarters on the back of AI data-center demand. Hyperscalers and AI labs need vast amounts of flash storage to hold training data, model checkpoints and inference workloads, and Sandisk was positioned right in the path of that spending.

What This Means for Investors

Mizuho's target of $2,050 sits well above where the stock closed, signaling the firm still sees significant upside as AI storage needs grow. However, the fact that Micron moved in the same direction suggests investors are treating this as a sector-wide reassessment rather than a verdict on Sandisk alone.

What's Next

Sandisk is scheduled to release its fiscal Q1 2027 results on October 29, 2026. Strong numbers and confident guidance about AI customer orders could restore some of the lost confidence. Soft guidance or signs of slowing orders could give the bears more ammunition.

Institutional Repositioning

The heavy volume on Thursday is worth noting. Large share counts changing hands on a down day often indicate institutional repositioning rather than casual retail selling.