Micron, SK Hynix Stocks Sink as AI Chip Sell-Off Deepens
**Memory chip stocks suffered their worst single-day rout in over a decade on July 28, with Micron, SK Hynix, and SanDisk each plunging more than 30% as fears of an AI bubble, rising Chinese competition, and "circular financing" concerns wiped out over $80 billion in market value.**
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## The Numbers That Matter: A Single-Session Wipeout
The selloff was brutal and broad-based. Investors who had ridden the AI memory boom to record highs watched those gains evaporate in a single session.
| Company | Decline (July 28) | Decline From High |
|---------|------------------|-------------------|
| **SK Hynix (SKHY)** | -34% | ~47% from June peak |
| **Sandisk (SNDK)** | -32% | -50% |
| **Micron (MU)** | -31% | -33% |
| **Western Digital (WDC)** | -42% | — |
| **Seagate (STX)** | — | -34% |
Micron closed at $92.40, pushing its forward price-to-earnings multiple to **6.3 times** — a level typically associated with distressed cyclicals, not AI beneficiaries . SK Hynix, which listed on the Nasdaq just last month, fell below its $149 IPO price, trading near $137—roughly 8% beneath its debut level .
The selloff wasn't confined to memory. The **Philadelphia Semiconductor Index fell 6.8%**, its steepest drop since March 2020 . Nvidia lost its position as the world's most valuable company to Apple after a 5% decline on Monday . AMD fell more than 8%, and ASML dropped 7.3% .
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## The Global Contagion: From Seoul to Silicon Valley
The U.S. losses followed a brutal session in Asia, where the AI trade collapsed with stunning speed.
### South Korea: The Epicenter
South Korea's KOSPI index plunged **10.8%** to 6,023.66, triggering multiple trading halts after the benchmark dropped more than 8% intraday . The index has now fallen roughly 29% over the past month, officially entering bear market territory .
| Stock | Decline |
|-------|---------|
| **SK Hynix** | -14.7% |
| **Samsung Electronics** | -13.4% |
The weakness in Korean memory stocks has rippled throughout global semiconductor markets, given the outsized role these companies play in the global chip supply chain. SK Hynix is the dominant supplier of high-bandwidth memory (HBM) to Nvidia, making it especially exposed to swings in AI sentiment .
### Japan and Taiwan
- **Japan's Nikkei 225** fell 4%, with memory-chip maker Kioxia sinking 18%
- **Taiwan's Taiex** dropped 4.7%, with TSMC falling 3%
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## Why the AI Memory Trade Unwound
The selloff was driven by a confluence of factors that together represent the most significant threat to the AI chip narrative since the boom began.
### 1. The Chinese Competition Threat
China's rapid advances in semiconductor technology have added fresh urgency to the selloff.
**CXMT's Blockbuster IPO:** Chinese memory maker CXMT surged 466% on its Shanghai debut on July 27, raising $8.6 billion and pushing its market value to $487.7 billion . The listing funded a domestic DRAM expansion that could increase supply and pressure memory prices over the coming years .
**Domestic DUV Production:** A report that a Chinese state-backed company has begun mass-producing immersion DUV chipmaking tools fueled a selloff in ASML shares . While these machines still lag ASML's technology, they provide a domestic alternative that could eventually reduce China's reliance on foreign equipment—a key pillar of U.S. export controls .
Morningstar analyst Jing Jie Yu said the market was "spooked by the progress of China's chipmaking equipment capabilities" but added that the selloff was "largely a knee-jerk reaction and overdone" .
### 2. The AI Spending Reckoning
Investors are increasingly questioning whether the massive AI infrastructure spending will generate adequate returns.
"Investors have also become more skeptical about the payoff from billions of dollars in AI infrastructure investments, raising questions about whether the spending will generate adequate returns" .
This week's earnings reports from Microsoft, Amazon, and Meta—all expected to announce further AI spending increases—will be closely watched . Any hint of a slowdown would spell trouble for the semiconductor companies that supply the chips and equipment.
### 3. The "Circular Financing" Concern
Nvidia's deepening role as financier and guarantor for the AI ecosystem has drawn scrutiny.
The company is reportedly in talks to provide around **$250 billion** in guarantees for a massive data center project tied to OpenAI . This followed a **$500 billion** strategic collaboration with SK Group announced on Friday .
Critics argue this "circular financing"—Nvidia guarantees financing, data centers are built, AI companies lease compute, and AI companies use Nvidia-guaranteed money to buy Nvidia chips—concentrates risk on a single credit chain.
### 4. Supply Is Catching Demand
The original AI memory thesis rested on one simple fact: there was not enough supply. That shortage is beginning to ease.
Manufacturers have expanded HBM capacity aggressively while NAND and DRAM production continues to increase. Memory manufacturers have already started warning that the premium pricing environment may be peaking .
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## Is This a Correction or a Crash?
The answer depends on who you ask.
### The Bull Case
Micron's single-digit forward multiple has historically been a buy signal. Since 2010, the stock has suffered 22 separate drawdowns of 20% or more within a single month. Of those, **15 were followed by a positive return over the next 12 months**, with a median gain of 26% .
Jing Jie Yu of Morningstar called the selloff "largely a knee-jerk reaction and overdone," arguing that the dominant position of global chipmaking leaders is unlikely to be threatened meaningfully .
### The Bear Case
Memory stocks rarely bottom after the first leg down. Current valuations still price in years of elevated profitability that rising supply may undercut. China's CXMT IPO, domestic DUV production, and efficiency gains in AI training all challenge the thesis that AI demand would absorb every wafer memory makers could produce .
Even after losing one-third to one-half of their value, every major memory stock except SK Hynix still trades hundreds of percentage points above where it began the AI memory run .
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## What Happens Next
**Earnings Season:** Investors are awaiting earnings this week from Microsoft, Amazon, and Meta—all of which are expected to announce further AI spending increases. Any hint of a slowdown would spell trouble for the semiconductor sector .
**The China Question:** CXMT's IPO has funded a domestic expansion that could increase supply and pressure prices. Chinese domestic DUV production, while still far behind ASML, provides a long-term alternative.
**The AI Profitability Question:** The next test for the AI trade will be whether hyperscalers can show returns on their massive investments. As one analyst put it: "The question is whether this is a cyclical correction or the end of the AI memory supercycle" .
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## Frequently Asked Questions
### Q: Why did memory chip stocks fall so sharply on July 28, 2026?
A: The selloff was driven by a combination of factors: concerns about rising Chinese competition from CXMT's IPO and domestic DUV production, worries about "circular financing" in the AI industry, skepticism about the payoff from AI infrastructure spending, and a broader realization that memory supply is catching up with demand .
### Q: How much did SK Hynix fall?
A: SK Hynix fell 34% on July 28, its worst session since the 2008 financial crisis. The stock has now lost roughly 47% from its June peak and traded below its $149 IPO price .
### Q: What triggered the selloff in Asia?
A: South Korea's KOSPI plunged 10.8%, with SK Hynix down 14.7% and Samsung down 13.4%. The weakness spread to Japan (Nikkei -4%, Kioxia -18%) and Taiwan (Taiex -4.7%, TSMC -3%) .
### Q: Is Nvidia affected?
A: Yes. Nvidia lost its position as the world's most valuable company to Apple after falling 5% on Monday. The stock has declined roughly 17% from recent highs .
### Q: Is this the end of the AI memory supercycle?
A: Analysts are divided. Some view this as a necessary correction within a still-intact bull market. Others worry that the AI memory thesis—tight supply, premium pricing, insatiable demand—is coming under pressure from Chinese competition and capacity expansion .
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## Disclaimer
**IMPORTANT:** This article is for informational and educational purposes only and does not constitute financial, investment, or trading advice. The information contained herein is based on publicly available sources and reflects the author's understanding as of the publication date. Market conditions, stock prices, and company performance are subject to rapid change. Past performance is not indicative of future results. You should consult with a qualified financial advisor before making any investment decisions.
*Published: July 28, 2026*
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**Tags:** Micron, SK Hynix, AI chip selloff, semiconductor stocks, memory chips, KOSPI, AI trade, CXMT, Nvidia, SanDisk, Samsung, chip market crash, AI infrastructure, circular financing, Taiwan Semiconductor, ASML, AMD, Intel
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