SanDisk ($SNDK) Tumbles as Markets Start Questioning AI Valuations

SanDisk ($SNDK) — one of 2026’s biggest AI winners, up more than 700% this year — tumbled around 10% on July 1, dragging the entire memory-chip sector down with it. It wasn’t bad news from the company; it was the market suddenly taking a hard look at whether AI-linked valuations have run too far ahead of reality. From flash memory to cloud computing, investors are asking the same question: is all this AI demand as durable as the sky-high prices assume? Here’s why SanDisk fell, and why it’s a window into a much broader re-examination of the AI trade. This is general market information, not investment advice.

What happened to SanDisk stock?

SanDisk fell roughly 9–11% on Wednesday to around $2,000, with the slide extending into Thursday, and it wasn’t alone: rival memory makers slid in lockstep, with Micron down about 8–9% and Western Digital off around 7%, while Korean giants SK Hynix and Samsung also dropped. That coordinated move is the tell — this was a sector-wide sell-off driven by profit-taking and a rotation out of AI hardware, not a company-specific stumble. And the profits on the table were enormous: SanDisk has climbed more than 700% in 2026 and over 3,000% in a single year, going from around $37 in early 2025 to more than $2,000.

Why did SanDisk fall if its business is booming?

This is the puzzle: SanDisk’s actual results are excellent. In its most recent quarter it reported revenue of $5.95 billion, up 251% from a year earlier, with earnings that crushed estimates and data-center revenue up a staggering 645% — the CEO called it a fundamental inflection point for the company. So the drop isn’t about the business weakening.

It’s about the price. After that parabolic run, SanDisk trades at roughly 77–80 times earnings — nearly double its industry’s average — and by some measures well above analysts’ estimate of fair value. When a stock is priced that richly, it’s priced for perfection, and even great fundamentals leave little cushion. So when investors decided to take profits and question whether the AI rally had gone too far, a stock like SanDisk fell hard despite doing nothing wrong.

How does “AI compute oversupply” connect to memory?

Here’s the link to the week’s bigger story. The same fear rattling cloud computing — that Big Tech may be building too much AI capacity — has a direct parallel in memory. Just as reports that Meta will sell its excess AI compute spooked cloud providers over potential oversupply, investors worry the memory boom could tip the same way.

Memory is a famously cyclical business. Right now SanDisk, Micron, SK Hynix and Samsung are all expanding capacity at once — and historically, when every major supplier ramps up together, it ends in a sharp price downturn as soon as demand growth slows. A fresh trigger came when SK Hynix was reported to be slowing its next-generation AI-memory expansion in favor of ordinary commodity chips, which investors read as a sign the red-hot AI-memory cycle may be nearing a peak. That matters enormously for SanDisk, because a large share of its future flash-memory supply isn’t locked into fixed-price contracts — it’s exposed to volatile spot prices. If oversupply pushes those prices down, SanDisk’s fat profit margins could compress quickly.

Is this the market re-examining AI valuations more broadly?

Yes — and that’s the real significance of the SanDisk drop. It’s not an isolated event but part of a market-wide rethink of the entire AI trade happening in the same window.

In just a few days, Meta’s cloud plan hammered specialist compute providers, Tesla’s sky-high AI valuation was called into question despite blowout car sales, memory stocks like SanDisk sold off on oversupply worries, and investors rotated money out of AI hardware and into AI software names like Microsoft. Running through all of it is a single question: after a year in which anything touching AI went parabolic, has the market priced in more growth than the underlying demand can sustainably deliver? SanDisk, having risen more than 3,000% in a year, is simply one of the most dramatic places for that doubt to show up.

Is the SanDisk sell-off a warning, or a buying dip?

There’s a genuine debate. On the bullish side, SanDisk’s fundamentals remain strong, the shortage of AI memory is widely expected to persist into 2027, and several analysts still carry price targets well above the current level, arguing the drop is just positioning and profit-taking rather than a broken story. On the bearish side, an ~80x earnings multiple on a cyclical, boom-and-bust memory business is hard to justify, a big chunk of future supply is exposed to spot prices that could fall if oversupply arrives, the stock’s “rare AI-memory play” scarcity premium is fading as a bigger rival prepares to list in the US, and insiders have been selling — notably, the stock has run past most analysts’ price targets. Both cases are credible, which is exactly why a name this stretched can swing so violently.

The bottom line

SanDisk tumbled not because anything went wrong at the company, but because the market has begun stress-testing the assumption underneath the entire AI rally — that demand will keep growing fast enough to justify valuations that have gone vertical. The same oversupply fear pressuring cloud compute is now hitting memory, and it’s part of a broader rotation away from the year’s most stretched AI winners. Whether this proves a healthy pause or the start of a deeper reset for the AI trade is unresolved. For the connected stories, see why Meta’s stock jumped on its AI cloud plan, why CoreWeave crashed on the same news, and our look at why the Nasdaq-100’s QQQ ETF has been sliding.

This article is general market information, not investment advice. Prices and figures are approximate and as of around July 1–2, 2026; they move quickly and can reverse. Past performance does not guarantee future results. Do your own research before making any investment decision.