SanDisk Stock Drops 14% as AI Memory Rally Finally Hits Valuation Wall

SanDisk (SNDK) plunged to $1,745 as tech selling and valuation concerns hit one of 2026’s biggest winners, even as AI-driven NAND demand remains a powerful long-term support.

SanDisk Sell-Off Tests the AI Memory Trade

SanDisk Corp. (NASDAQ: SNDK) suffered a sharp reversal on Thursday, closing at $1,745 after falling 14.13%. The stock recovered slightly after hours, but the move marked a major shift in tone for one of the year’s strongest AI memory trades.

The pullback came as investors took profits across high-growth technology and semiconductor names. After a massive run earlier this year, SanDisk became especially vulnerable to any rotation away from expensive AI-linked stocks.

Valuation Concerns Move Back Into Focus

SanDisk’s long-term story remains tied to AI infrastructure demand, but valuation has become harder to ignore.

The stock has surged dramatically over the past year, with some market data showing gains of more than 4,000%. That type of move leaves little room for disappointment, even when the business backdrop is improving.

Recent valuation commentary has pointed to SanDisk trading at elevated earnings multiples versus the broader technology sector and its own historical range. GuruFocus data cited a P/E ratio above 60x and a GF Score of 46/100, while also noting insider selling over the past three months.

That does not automatically break the bull case, but it does explain why the stock sold off so violently when broader semiconductor sentiment weakened.

AI Demand Still Supports NAND Pricing

The bullish argument is not gone.

SanDisk remains a major beneficiary of the AI data-center buildout. GPUs get most of the attention, but AI servers also need huge amounts of fast storage. Training and inference workloads generate enormous volumes of data, making NAND flash and enterprise SSDs increasingly critical.

That has helped tighten the NAND market. Analysts have pointed to rising contract prices, stronger enterprise SSD demand, and better supply discipline across the memory industry.

This cycle also looks different from older NAND booms because suppliers have been more cautious with wafer output after years of weak pricing. If hyperscaler AI spending remains strong, SanDisk’s earnings could stay elevated longer than prior cycles.

SanDisk’s Easy Gains May Be Behind New Buyers

The problem is timing.

SanDisk entered the second half of 2026 as one of the S&P 500’s top performers. That status attracts momentum buyers, but it also invites fast profit-taking when the trend turns.

The stock’s sharp slide does not necessarily mean the AI memory thesis is over. It does mean traders are now demanding more proof that NAND pricing strength can last into 2027 and 2028.

Upcoming earnings commentary on enterprise SSD demand, contract pricing, and customer commitments will be critical.

SNDK Technical Analysis: 4-Hour Chart Breaks Short-Term Trend

From a technical perspective, SanDisk’s 4-hour chart has turned sharply weaker.

The stock is now trading below all major short-term moving averages. The first resistance level is the Hull Moving Average at $1,822.12. Above that, the 50 EMA at $1,891.17 and 50 SMA at $1,908.19 become the next key barrier.

SNDK Chart 4H – Sharp Breakdown Puts $1,642 Support in Focus

A stronger recovery would require SanDisk to reclaim the $1,987-$2,084 zone. That area includes the 30 EMA at $1,987.01, 10 EMA at $1,988.68, 20 EMA at $2,015.50, Ichimoku base line at $2,023.69, 10 SMA at $2,037.80, 30 SMA at $2,051.98, VWMA at $2,074.24, and 20 SMA at $2,083.91.

Until SNDK gets back above $2,000, rallies may face heavy selling pressure.

The longer-term trend is not fully broken yet. The 100 EMA at $1,642.01 and 100 SMA at $1,608.44 are still flashing buy signals. The 200 EMA at $1,282.63 and 200 SMA at $1,150.06 remain much lower, showing how far the stock has climbed above its long-term base.

Oscillators show pressure but also hint at a potential bounce. RSI is neutral at 40.53, while Stochastic %K is low at 15.29 and Stochastic RSI is deeply low at 5.07. Williams %R is flashing a buy signal at -92.28. However, Momentum, MACD, and the Awesome Oscillator all show sell signals, confirming that short-term momentum remains bearish.

What’s Next for SanDisk Stock?

The first support zone is $1,642-$1,608. If that breaks, the decline could deepen toward the $1,282 area.

On the upside, SNDK must first reclaim $1,822, then $1,891-$1,908. A real recovery requires a move back above $2,000.

For now, SanDisk remains a powerful AI memory story, but the technical picture has changed. After a huge first-half rally, the stock needs to prove that this is a healthy reset rather than the start of a deeper momentum unwind.