Following two consecutive days of strong gains and a record-breaking quarterly performance, U.S. memory chip stocks encountered a sharp sell-off on Wednesday.
On Wednesday, July 1, Eastern Time, major U.S. stock indices were under pressure. During the morning session, while the S&P 500 and Nasdaq indices were down approximately 0.2% and 0.6% respectively, the Philadelphia Semiconductor Index (SOX) saw its intraday decline widen to over 5%, dragging the Nasdaq 100 index down by more than 1%.
The memory sector was particularly hard hit, with a key U.S. memory stock index falling around 9% intraday. Among its components, SanDisk Corp. (SNDK) dropped over 10%, Kioxia ADRs fell more than 10%, Micron Technology (MU) declined nearly 9%, while Western Digital (WDC) and Seagate Technology PLC (STX) were down over 8% at one point.
Simultaneously, semiconductor equipment stocks such as Applied Materials and Lam Research also retreated, indicating capital rotation away from the previously high-flying AI hardware supply chain.
Analysts suggest the current downturn resembles profit-taking following an unprecedented rally, rather than a significant deterioration in industry fundamentals. Over the past quarter, driven by AI infrastructure investment, robust demand for high-bandwidth memory (HBM), and expectations for improved supply-demand dynamics, memory chip stocks emerged as one of the top-performing semiconductor subsectors globally.
Significant Gains Preceded the Sharp Decline
It is noteworthy that Wednesday's steep drop occurred after several days of gains for the broader chip sector.
On Monday and Tuesday of this week, the U.S. semiconductor sector continued its momentum from the AI trade. The Philadelphia Semiconductor Index closed up 3.92% on Tuesday, marking an 11.05% gain for June and an 87.75% surge for the second quarter—its largest quarterly increase on record.
The memory sector had previously led the entire semiconductor industry. The U.S. Memory Chips & Hardware Supply Chain Index closed up 3.83% on Tuesday, soaring 159.01% for the quarter, far outpacing the broader market and the Philadelphia Semiconductor Index. SanDisk Corp. closed up nearly 10.9% that day, while Micron Technology gained nearly 0.8%.
Among the index's components for the quarter, SanDisk Corp. surged 257.88%, Micron Technology jumped 241.67%, Seagate Technology PLC rose 146.55%, Western Digital advanced 136.19%, Applied Materials climbed 111.78%, and Lam Research increased 103.01%.
What Triggered the Sudden Market Shift?
Recently, several Wall Street institutions have cautioned that despite the strong AI-driven demand for memory, market valuations have risen significantly after months of substantial gains.
Analysts believe the current pullback is driven by a confluence of factors:
Firstly, concentrated profit-taking pressure is being released. After an epic rally in the second quarter, memory stocks became one of the most concentrated AI holdings for institutions. In the absence of major new catalysts, many investors are choosing to lock in profits.
Secondly, the market is beginning to reassess the AI supply chain's growth trajectory. As share prices of major memory manufacturers soared rapidly, investors are focusing on whether future quarterly earnings growth can keep pace with the expansion in valuations. While demand for HBM, high-performance DRAM, and enterprise SSDs remains strong, discussions about potential future supply increases and a moderation in price growth have also intensified.
Thirdly, sector rotation has intensified. With the semiconductor sector significantly outperforming major U.S. indices recently, portfolio rebalancing by many funds at the quarter's end and month's beginning has also amplified volatility.
Industry Fundamentals Remain Largely Intact
However, from an industry fundamentals perspective, most institutions have not altered their optimistic view on the memory sector's cyclical recovery.
Recently, several manufacturers, including Micron Technology, have indicated that demand for AI servers, high-bandwidth memory (HBM), and data center SSDs remains robust, with supply for advanced memory products continuing to be tight. The industry's supply-demand balance has notably improved compared to recent years.
The market's focus is gradually shifting from "whether the industry is recovering" to "how long the profit improvement can last."
For investors, after a record-breaking rally, short-term volatility in the memory sector is likely to increase significantly. However, if the AI infrastructure investment cycle persists and HBM supply-demand remains in a tight balance, the long-term industry thesis has not yet fundamentally changed.
Wednesday's sharp intraday decline appears more like a temporary cooldown after a historic surge, rather than a signal that the memory chip upcycle has concluded.
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