In late May 2026, the US stock market witnessed another historic moment. The S&P 500 broke through 7520.36 points on May 27, setting a new record and continuing its strong performance thereafter. The Nasdaq Composite Index and the Dow Jones Industrial Average also simultaneously reached new highs. On the surface, the market seemed to be in a state of jubilation. However, just as experienced sailors don't only look at the calm sea, professional market observers know that the real risks and opportunities often lie hidden "under the hood" of index fluctuations. The recent market's most notable characteristic is not a broad-based rally, but rather extreme "stock differentiation" and "sector rotation." AI hardware beneficiaries, represented by Dell Technologies and Micron Technology, saw astonishing single-day surges after their earnings reports. Meanwhile, cracks appeared within the chip stock sector, with funds quietly flowing into previously neglected software and cybersecurity sectors. More importantly, while the "smart money" and "dumb money" indicators, which measure market sentiment, did not show extreme signs of a bubble, the margin debt levels of the New York Stock Exchange are sounding a historical alarm. I. Distortion Under New Index Highs: Why the Market Hides the Truth As of May 28, 2026, the S&P 500 index has risen approximately 10% year-to-date. From a technical perspective, since April 8, 2026, the index has been in a long-term upward trend channel, with an increase of 12.62% over the period. However, beneath the surface of this impressive performance, the breadth of the market is narrowing. Data shows that while the S&P 500 index has reached new highs, the proportion of individual stocks above their 20-day, 50-day, and even 200-day moving averages has slightly declined in recent trading days. This divergence between an "index bull market" and a "stock bear market" is usually an early signal of weakening market momentum. While this can be partly attributed to month-end (before Memorial Day) portfolio adjustments and profit-taking, it reveals that the current index rise is highly dependent on the driving force of a few leading heavyweight stocks. This reliance is particularly evident in the Nasdaq 100 index (NDX). A simplified analysis of the NDX's opening, high, low, and closing prices (OHLC) reveals a rapid rebound after a short-term "undercut." This movement indicates continued strong buying interest on dips, but the market's margin for error is rapidly decreasing. Day traders currently dominate, meaning short-term volatility will remain high, and the direction will be highly susceptible to intraday options flows and news events. II. The Rise of Giants: Dell and Micron's "Extraordinary" Growth If there is one absolute main theme in the market, it is undoubtedly "computing infrastructure." The recent financial reports released by Dell and Micron are not only successes for individual companies, but also strong validation of the entire AI investment logic. 1. Dell Technologies: Explosive Demand for AI Servers On May 29, 2026, Dell Technologies' stock price surged 32.76% at the close, marking its best single-day performance since returning to the public market. Behind this extreme pricing action lies a financial report that can be described as "nuclear-bomb-level." Data that defies expectations: Dell's first-quarter revenue surged nearly 88% year-over-year to $43.8 billion, far exceeding analysts' consensus estimate of $35.5 billion. Adjusted earnings per share reached $4.86, compared to market expectations of $2.94, exceeding expectations by a staggering 65%. This is not just a minor "better-than-expected" performance, but a complete crushing of Wall Street models. Morgan Stanley analysts even bluntly stated, "We misjudged this game; we're eating a humble pie," calling it "one of the most impressive quarters" they've seen since covering the hardware sector. The "hardcore" figures of the AI business: What truly drives the market crazy is the specific contribution of AI servers. AI server revenue surged 757% year-over-year to $16.1 billion this quarter. More importantly, the order backlog for AI servers reached a record $51.3 billion. Dell also raised its total revenue guidance for fiscal year 2027 from approximately $140 billion to $167 billion, with AI server sales alone expected to reach $60 billion. This means that the construction of AI infrastructure has not slowed down, but is expanding at an exponential rate. This is no longer hype, but rather concrete order deliveries and revenue recognition. 2. Micron Technology: A “Revaluation” from Cyclical to Growth Stock If Dell's surge was an open secret, then Micron Technology's milestone of surpassing a trillion-dollar market capitalization is more structurally significant. On May 26, Micron's stock price soared 19.3% in a single day, briefly pushing its market capitalization above $1 trillion. Previously, UBS had significantly raised its target price to $1,625, and Barclays also raised it to $1,175, triggering a market repricing. A Structural Shift in Profitability: Micron's revenue for the second quarter of fiscal year 2026 (earnings season) reached $23.86 billion, a 196% year-over-year increase; Non-GAAP earnings per share were $12.20, a 682% year-over-year increase. These figures overturn the market's traditional perception of the semiconductor memory chip industry as "cyclically unprofitable." The most crucial narrative shift lies in long-term supply agreements. Previously, memory chip prices fluctuated wildly with supply and demand, leading to highly unstable corporate profits. However, in the AI era, high-bandwidth memory (HBM) is "completely sold out." Micron CEO Sanjay Mehrotra stated that the company can currently only meet 50% to two-thirds of its customers' demand. Micron has signed its first five-year strategic customer agreement, transforming its supply relationship from a "spot transaction" to a "subscription" model with stable cash flow. Analysts point out that even after this surge, its forward P/E ratio is still less than 9, significantly lower than the S&P 500's 21.8 (forward P/E ratio). This "high growth, low valuation mismatch" explains why institutional funds continue to pour in regardless of short-term gains. III. Internal Rotation: The Succession of CPU, ARM, and Software While focusing on Dell and Micron, a subtle "sibling rivalry" and fund rotation is taking place within the market. 1. ARM: The CPU Narrative Awaiting Implementation Nvidia CEO Jensen Huang has significantly increased his mention of the word "CPU" in recent earnings calls. This signal directly triggered a repricing of Arm Holdings (ARM). Nvidia's deep collaboration with ARM in the CPU field is seen as a key alliance against Intel's x86 architecture. However, ARM's recent stock price movement has exhibited a "high-level fluctuation" characteristic. Although the company is extremely optimistic about the prospects of data center CPUs, even doubling its sales forecast for its AGI CPU to $2 billion, supply-side constraints (wafers, packaging) have delayed mass production. The market is currently pricing in "expectations," not current performance. Therefore, ARM becomes a "thermometer" for measuring whether AI-themed trading is overheated: if its stock price weakens despite positive news from Nvidia, short-term profit-taking should be watched closely. 2. Nvidia's foray into PCs: The "Disruption" at Computex The upcoming Computex 2026 in Taipei is the next key catalyst. Nvidia, in conjunction with Microsoft and ARM, released a teaser for a "new era of PCs," and is expected to officially launch consumer-grade PC chips based on the Arm architecture (rumored to be the N1/N1X). This move aims to directly impact the core business areas of Intel and AMD. Leaked specifications show that the N1X will integrate a Blackwell architecture GPU, offering performance comparable to gaming laptops with dedicated graphics cards. For investors, this signifies Nvidia's expansion of its total addressable market from data centers to the $120 billion annual PC processor market, further extending the boom in the AI sector. 3. The "Catch-Up" in Software After the continuous rise in the semiconductor sector, funds are beginning to focus on relatively "cheap" areas—software and cybersecurity. Data shows that the software sector (IGV) has recently shown a significant positive divergence, meaning the index fluctuates but the lows are rising. From the beginning of 2026 to the present, software stocks were sold off due to market concerns that artificial intelligence would weaken the traditional "pay-per-seat" software business model. However, as the Cybersecurity Index (CIBR) shows, with the popularization of AI applications, enterprises' demand for security controls has increased rather than decreased. Software embedded in enterprise critical workflows, such as ServiceNow, has demonstrated pricing power. Against the backdrop of generally inflated price-to-earnings ratios in the semiconductor sector, software companies that are still in the 8-15 P/E ratio range have begun to re-enter the institutional spotlight, becoming a "safe haven" to hedge against the risk of AI hardware corrections. IV. Capital Profile: The Silence of "Smart Money" and "Dumb Money" To judge the sustainability of the current market, analyzing the nature of capital is more important than analyzing prices. In the market, institutional funds are often referred to as "smart money," while retail investors are called "dumb money." What is the current situation? Data shows that institutional fund flows have recently shown a "flattening" characteristic, without large-scale aggressive buying or systematic selling. At the same time, retail investor funds have not engaged in panic selling (pushing), but rather chosen to hold their positions. This "maintaining the status quo" fund structure is actually a bullish signal. Historically, market tops have often been accompanied by either extreme optimism from retail investors rushing in (taking over) or extreme pessimism from institutions selling off. Currently, neither extreme reading is observed. Retail investors have not frantically leveraged their investments due to rising stock prices, and institutions have not rushed to exit due to overvaluation. This kind of "calm rise" usually has good sustainability. However, we must be wary of the "first driving force" of capital outflows. Although institutions maintain a neutral overall view, they exhibit a continuous net buying pattern in the last hour of each trading day. This kind of "end-of-day rally" has been extremely rare in the past 20 years; the last time a similar steep slope was seen was in 2014-2015. This demonstrates both institutional confidence in the market outlook and creates a "no-correction" upward trend—that is, every small dip is quickly bought up. V. The Only Warning: The Distance Between Margin Debt and Historical Tops Beyond all technical indicators and fundamental analysis, the single variable that the market most needs to be wary of right now is: New York Stock Exchange margin debt. By observing the 12-month change rate of margin debt, we can measure the frenzy of investor leverage. Historical data reveals two key thresholds: During the dot-com bubble: this indicator reached approximately 75%. On the eve of the 2008 financial crisis: This indicator touched a similar high level again. Currently, this indicator is rapidly approaching the historical warning line. Although it has not yet reached its extreme value, the rate of increase is concerning. If this indicator breaks through the previous high and continues to accelerate, it often means that the market's purchasing power has been "overdrawn," and a liquidity crisis caused by deleveraging will follow. Currently, the S&P 500's Shiller CAPE ratio (cyclically adjusted price-to-earnings ratio) and the "Buffett Indicator" (total market capitalization/GDP) are both at historical highs. JPMorgan Chase predicts that the S&P 500's average annual return over the next ten years may be less than 5%. It's important to distinguish between the current high valuations and those of 2000. In 2000, the market chased "eyeballs" (traffic) and "click rates," and companies generally lacked profit support, relying on debt financing. Currently, leading companies like Nvidia, Dell, and Micron possess real and explosive profit and cash flow growth. Micron's price-to-earnings ratio is even below the market average. Therefore, while margin debt is a "sword of Damocles" hanging over their heads, it triggers a "correction" rather than a "collapse," unless there is a precipitous drop in corporate profit growth. Conclusion: Finding Certainty Amidst Differentiation The current market is in an "atypical" bull market phase. New highs in the index mask extreme stock-specific divergence. The core conclusions are as follows: The AI cycle is still accelerating: Financial reports from companies like Dell and Micron prove that the investment wave in AI infrastructure is far from over, and is even accelerating. Sector rotation is underway: Funds are flowing from pure semiconductor design companies that have seen excessive short-term gains to relatively undervalued AI hardware manufacturers (servers, storage) and defensive cybersecurity and specific software sectors. The funding environment is relatively healthy: Neither institutional nor retail investors are currently exhibiting extreme emotional trading. The institutional buying spree at the close provided solid support for the market. The only short-term risk is leverage: Margin debt levels are currently the most important indicator. As long as this indicator does not break through the critical point and turn downwards, the market's structural upward trend will not be broken. For investors who only focus on index fluctuations, the market may seem "too high to be safe"; however, for professional investors who delve into financial reports, understand industry trends, and capital flows, the current market still offers clear structural opportunities. The real danger signal doesn't come from the parabolic trajectory of stock prices, but from the slowdown in earnings growth and excessive leverage—a moment that has clearly not yet arrived.
Joy
Brian
YouQuan
Hui Xin