Shares of SanDisk Corp., Micron Technology Inc., and Western Digital Corp. extended sharp declines on Tuesday, as the artificial intelligence-linked memory trade faced mounting pressure from fears of Chinese competition. SanDisk fell over 11%, Micron dropped more than 8%, and Western Digital lost another 12%, while Seagate Technology Holdings plc sank nearly 10%. The selloff reflects a broader reassessment of valuations across the semiconductor sector, with investors unwinding positions after a prolonged rally driven by AI infrastructure spending.

The weakness stems largely from concerns that China is rapidly closing the technology gap in memory chips. ChangXin Memory Technologies (CXMT), China’s state-backed memory champion, stunned investors with a 466% first-day gain following its Shanghai IPO. Additionally, reports that Chinese manufacturers have begun mass-producing domestic deep ultraviolet (DUV) lithography systems have fueled fears that future supply could expand faster than expected, potentially pressuring global pricing.

Diverging Views on Competitive Threats

Analysts remain divided on the severity of the threat posed by Chinese manufacturers. Nic Puckrin, cross-asset analyst at Coin Bureau, described the situation as a “DeepSeek moment” for chip makers, suggesting that market psychology may outweigh fundamental earnings results. He noted that even record financial performance might struggle to reverse sentiment if expectations remain excessively high.

Conversely, Counterpoint Research analyst MS Hwang argues that Chinese progress is concentrated primarily in commodity DRAM and NAND, rather than the high-bandwidth memory (HBM) chips powering Nvidia’s AI accelerators. Hwang stated that Chinese suppliers may not manufacture HBM3 until the first half of 2027, by which time Micron, SK Hynix, and Samsung are expected to have moved into HBM4 production.

Long-Term Supply Agreements Remain Intact

Despite the near-term volatility, long-term structural demand for advanced memory appears secure. Industry reports indicate that Nvidia has secured multi-year HBM supply agreements worth as much as $500 billion with SK Hynix. Collectively, Nvidia, SK Hynix, Samsung, and Broadcom have locked in nearly $950 billion of long-term HBM supply commitments.

Yuri Khodjamirian, chief investment officer at Tema ETFs, emphasized that the market remains undersupplied well into 2028. He argued that investors are conflating China’s advance in commodity memory with leadership in AI-specific memory. “I don’t think U.S. AI builders are going to be using HBM from China,” Khodjamirian said, noting that certification processes for HBM are rigorous and difficult to replicate quickly.

Technical Outlook and Earnings Ahead

SanDisk shares were down 5.58% at $1,206.92 during premarket trading on Tuesday. Despite the recent correction, SanDisk remains up more than 2,950% over the past 12 months. The stock is scheduled to report quarterly results on August 5, with Wall Street expecting significant year-over-year improvement.

Short-term technical indicators suggest continued weakness. The 20-day simple moving average (SMA) has crossed below the 50-day SMA, a bearish signal. However, the 50-day SMA remains above the 200-day SMA, indicating the longer-term uptrend is intact. Key support sits near $998.65, while resistance is located around $1,308.68.

SanDisk Corp. (NASDAQ: SNDK) shares tumbled more than 12% on Monday, making it the worst-performing stock in the Russell 1000 index. The sharp decline was driven by renewed investor anxiety regarding China’s expanding memory chip industry, specifically following the blockbuster Shanghai IPO of ChangXin Memory Technologies. This sell-off pushed SanDisk down more than 45% from its record high in June, reflecting broader concerns that increased supply from Chinese manufacturers could disrupt global NAND pricing dynamics.

The immediate market reaction extended beyond SanDisk’s equity, significantly impacting related financial instruments. The Tradr 2X Short SNDK Daily ETF (BATS: SNDQ), which seeks to deliver twice the inverse daily return of SanDisk shares, surged approximately 25% on Monday. This performance made SNDQ one of the best-performing exchange-traded funds of the day. The ETF’s gains highlight how leveraged products amplify sharp daily swings, although these instruments are generally designed for short-term tactical trading rather than long-term investing due to their daily reset mechanism.

Technical Breakdown

Monday’s price action marked a critical technical breach for SanDisk. The stock closed below its 100-day moving average for the first time since August 2025. This breakdown follows a steep 10.8% drop recorded on Friday, indicating sustained selling pressure over two consecutive trading days. A decisive break below this moving average is widely watched by traders as a gauge of longer-term momentum and can signal that bullish sentiment has weakened, potentially inviting additional selling from technical traders and quantitative funds.

Competitive Landscape

The sell-off reflects deeper anxieties about the competitive landscape in the memory chip sector. While SanDisk faces direct pressure from new entrants, the market is closely monitoring Beijing’s industrial policy and its influence on global supply chains. The successful public debut of ChangXin Memory Technologies is viewed as a signal of deeper state-backed investment in the semiconductor sector. Investors worry that this could lead to overcapacity and price wars, directly impacting margins for established players like SanDisk.

What the Numbers Show

The divergence between SanDisk’s equity performance and the surge in its inverse ETF underscores a rapid shift in market sentiment. Earlier this year, SanDisk was considered a standout performer in the semiconductor sector. However, investors are now reassessing earnings expectations amid the prospect of greater global supply and tougher competition. The combination of a significant IPO by a Chinese competitor and subsequent stock declines suggests that the market is pricing in a more aggressive competitive environment for NAND flash memory in the near term.