SanDisk Stock Rockets 726% in 2026 Ahead of Its Make-or-Break Earnings

SanDisk shares closed at $1,385.98 on Tuesday, up 7.6%, capping a 726% year-to-date rally that makes it the best performer in the S&P 500, ahead of its fiscal fourth-quarter earnings on August 5. The company's datacenter revenue jumped 645% year over year to $1.47 billion last quarter, and total revenue of $5.95 billion beat guidance, driven by NAND price increases of 60% to 75% as hyperscalers buy storage for AI servers. The stock, which hit an all-time high of $2,335 on June 25 before falling over 55%, faces a make-or-break test on whether its valuation is justified.

SanDisk has turned into the wildest trade in the S&P 500, up more than 700% this year, and Wednesday's earnings will decide whether the story is real or just a chart. SanDisk shares rose 7.6% on Tuesday to close at $1,385.98, capping a run that has left the memory chipmaker up roughly 726% year to date, the single best performer in the S&P 500 by a wide margin. The company reports fiscal fourth-quarter and full-year 2026 results after markets close on Wednesday, August 5, and traders are treating the print as a verdict on whether this rally is built on real demand or just momentum. Here's how fast this has moved. On July 30, SanDisk jumped about 26% in a single session after Microsoft's earnings showed cloud and AI infrastructure spending still climbing despite worries about data-center costs. Samsung added fuel that same week, warning that global memory shortages could stretch into 2028. Micron rose alongside SanDisk on the same news, and SK Hynix climbed too, but SanDisk has been the one Wall Street can't stop talking about. The number underneath the hype is real. SanDisk's datacenter revenue jumped 645% year over year to $1.47 billion last quarter, and total revenue of $5.95 billion came in above what management had guided for. NAND flash prices have climbed as much as 60% to 75% in recent quarters, according to industry pricing trackers, as hyperscalers buy up storage capacity for AI servers the same way they've been buying GPUs. SanDisk and SK Hynix also unveiled a new High Bandwidth Flash standard this year, a joint format meant to widen the addressable market for AI memory across chipmakers. This isn't a smooth climb. SanDisk hit an all-time high of $2,335 on June 25, then fell more than 55% from that peak before this week's rebound. That kind of swing is not what you'd expect from a company with a genuine supply shortage behind it, and it's a big reason Wall Street keeps hedging its enthusiasm. TradingKey's research desk has flagged a Street-high price target of $3,050 on the stock, more than double where it trades now, while other desks have turned cautious after the valuation stretched well past where memory stocks have historically traded. WallStreetBets hasn't helped calm things down. Retail chatter on the SanDisk ticker has tracked almost every leg of this move, with premarket surges of 5% or more showing up on days with no obvious news at all. Some of that Reddit-driven volume has reportedly started rotating into other chip names, a signal that the momentum trade may be getting tired even as the underlying supply story stays tight. SanDisk only became a standalone company in February 2025, spun off from Western Digital at a debut price of $52. It's now trading at roughly 27 times that. Frankly, a stock that goes from spinoff afterthought to the best performer in the S&P 500 inside 18 months is exactly the kind of move that draws both true believers and short sellers waiting for the first miss. Wednesday's earnings call, followed by an investor day on August 13, will be the first real test of whether SanDisk's backlog and pricing power justify the valuation, or whether the stock has simply run ahead of what any single quarter of NAND sales can support. Also read: Cardano surges 25% ahead of its August 9 ETF eligibility deadline https://startupfortune.com/cardano-surges-25-ahead-of-its-august-9-etf-eligibility-deadline/ • Renesas Stock Jumps 13% While the Rest of the Chip Sector Craters https://startupfortune.com/renesas-stock-jumps-13-while-the-rest-of-the-chip-sector-craters/ • Wall Street Banks Are Being Asked to Bankroll Trillions in AI Data Centers https://startupfortune.com/wall-street-banks-are-being-asked-to-bankroll-trillions-in-ai-data-centers/