Sandisk has emerged as the S&P 500's top performer in 2025, rallying more than 1,030% since its February spin-off from Western Digital. The company’s market capitalization swelled to roughly $74 billion as investor interest in AI infrastructure drove unprecedented demand for high-speed storage solutions. Volume on the NASDAQ averaged 13 million shares daily, underscoring robust trading activity throughout its rally.

By separating from Western Digital, Sandisk sharpened its focus on NAND flash-based storage devices and enterprise SSDs, targeting the high-performance “hot tier” segment used for AI checkpointing and rapid data retrieval. This streamlined approach allowed management to hit its cash flow target six months ahead of schedule and to rebrand its consumer lineup under the SanDisk Optimus banner, signaling a clear, pure-play memory business identity.

Data center customers now account for approximately 12% of Sandisk’s revenue, which management projects will become its largest growth engine as hyperscale operators invest hundreds of billions in AI infrastructure over the next five years. For fiscal 2025, the company reported gross margins of 29.3% and expects 2026 revenue to exceed $10.4 billion—a 42% year-over-year increase—while earnings per share estimates have leapt from $2.99 to $13.46 on operating leverage from price gains.

Sandisk currently trades at about 30.8 times projected 2026 earnings, a premium compared with many tech staples but cheaper than leading AI hardware peers. J.P. Morgan cautions that a supply-glut cycle could pressure flash memory pricing, assigning a downside of up to 53% from its target price, while other strategists advocate dollar-cost averaging to manage potential volatility in this high-beta segment.