Sandisk (SNDK) Surges 695% in 2026 After Topping S&P 500 in 2025, History Suggests More Gains

Sandisk (SNDK) has rallied 695% year-to-date in 2026 after ranking as the S&P 500's best performer in 2025, a pattern that historically precedes continued strength. Over the past decade, the index's top annual stock has posted a median gain of 91% the following year, versus 18% for the broader S&P 500. Nvidia (NVDA) twice claimed the title, gaining 81% and 180% the next year, while AMD and Tesla showed similar follow-through. Only Occidental Petroleum (OXY) fell 5%. Sandisk, the world's fifth-largest NAND supplier by revenue, saw Q4 revenue jump 372%, driven by an AI-infrastructure cycle that doubled NAND prices rather than a durable competitive edge. It has not expanded market share. Wall Street projects 29% annual adjusted earnings growth through 2030, with a roughly 27x adjusted P/E. Analysts warn that if the chip shortage eases sooner than expected, earnings downgrades could trigger a sharp share decline.