#美股史诗级抛售 #Gate股票畅聊季 Epic crash! U.S. AI stocks plunge 12%—what comes next?

On November 6 U.S. time, global capital markets saw their bloodiest single-day rout since April 2025. All three major U.S. indexes plunged, with no rebound in sight:
▪ Dow Jones Industrial Average fell 3.44%
▪ S&P 500 plunged 4.35%, its biggest single-day drop in 7 months
▪ Nasdaq sank 5.52%
▪ Nasdaq 100 plunged 6.4%, wiping out more than $2.3 trillion in market value in a single day.
The real disaster, however, was concentrated in this year's strongest theme—the AI computing hardware supply chain.
This was no ordinary pullback, but a structural crash driven by a stampede:
▪ Philadelphia Semiconductor Index plunged 12%, its biggest single-day drop since the 2020 pandemic
▪ Memory stocks: Sandisk -22%, Western Digital/Micron -17%, SK Hynix -13%
▪ Optical communications stocks: Lumentum -18%, Marvell Technology -16%, Corning -12%
▪ Cloud computing stocks: CoreWeave and NEBIUS both plunged more than 9%
▪ The Magnificent Seven all took a heavy hit: Nvidia plunged 9% (erasing RMB 2.98 trillion in market value in a single day), and Tesla plunged 10%. Panic swept the market, and everyone was asking the same question: Has the century-old U.S. stock market rule that supposedly says "100% gains after midterm elections" completely failed?

1. First, dispel a misconception: Don't misread the "midterm elections always bring gains" rule
Wall Street has long cited a seemingly infallible historical statistic: since 1950, the S&P 500 has risen in every 12-month period after a U.S. midterm election, with an average gain of more than 15% and a 100% win rate. Countless traders have treated it as a "mindlessly bullish rule," but this latest plunge has exposed three fatal misconceptions about it—and the core logic behind this crash:
Misconception 1: The rule applies only to broad-market indexes, not individual sectors
The century-long statistics measure returns for the broad, diversified S&P 500; they don't cover high-valuation, overcrowded AI growth sectors.
Past midterm rallies featured balanced rotations among financials, consumer stocks, industrials, and technology. But the 2026 U.S. market is dominated by one-way, extreme crowding into AI computing power. The Nasdaq, semiconductors, and computing hardware are trading at historically extreme valuations, creating a very high risk of a stampede. The broad market may still end the year higher, while AI hardware stocks could be in a one-way bear market.
Misconception 2: The rule applies only when Congress is divided, not during a "full blue wave"
Nearly every midterm election that produced a rally over the past 70 years ended with the two parties splitting control and checking each other. Markets love "policy gridlock": no aggressive tax hikes, no harsh regulation, and no strict industry constraints. Maintaining the status quo is the biggest positive.
But in the 2026 midterms, the Democratic Party captured both chambers of Congress—a rare occurrence.
The market has completely repriced: accommodative policies will end, strict AI regulation will take effect, and constraints on computing infrastructure are coming. The catalysts have completely reversed, breaking the underlying assumptions of the historical sample.
Misconception 3: A 100% win rate doesn't mean there won't be a crash along the way
The classic comparison is the 2018 midterm election. After that election, U.S. stocks also suffered a sharp short-term selloff and the market was gripped by extreme panic. But the Fed later turned dovish and stepped in to support the market, and the 12-month period still ended higher. The century-old rule says the market "will be up at year-end"; it never said there wouldn't be a crash along the way. This sector-wide crash of 10% or more is entirely consistent with historical volatility.

2. The real core of this crash: It's not sentiment, but a repricing of AI industry fundamentals
Many attribute the selloff to "relief that election-related uncertainty is over, followed by a sentiment-driven selloff." That's a superficial interpretation.
This historic rout is essentially the market pricing in three ultimate headwinds for the AI industry all at once, bringing the era of mindless speculation to a definitive end:
1. State-level constraints on computing infrastructure shatter high-growth expectations
The biggest black swan in this election wasn't in Washington, but in Texas, the heartland of AI infrastructure. The state's first Democratic governor in more than 30 years has taken office, with a campaign platform that explicitly calls for immediately suspending approvals for new data centers. 70% of planned computing infrastructure across the U.S. falls under state and local government jurisdiction, and governors hold decisive power over environmental reviews, electricity prices, and grid approvals. The explosive expansion of AI computing power over the past two years depended on America's abundant low-cost power and land, with minimal restrictions and fast approvals.
Now the equation has completely reversed: slower infrastructure buildout → lower capital spending → reduced demand for optical modules, memory, high-voltage power distribution, and computing chips. This is the core reason optical communications, memory, and semiconductor stocks led the broader market lower.
2. Federal AI regulation becomes the norm, stripping away the growth premium
With Democrats in control of both chambers of Congress, the likelihood of three bills taking effect has risen sharply: AI safety reviews, controls on computing power and energy use, and antitrust measures targeting tech giants. Policy risks the market had previously chosen to ignore are now being priced in all at once. The AI industry is moving from "unconstrained, high-speed expansion" to "high-quality development under strict regulation." Sector valuation multiples are bound to decline systematically.
3. Extreme crowding triggers a stampede
Throughout 2026, global funds piled mindlessly into AI hardware, pushing crowding in computing power, memory, optical modules, and semiconductors to a three-year high. With no rotation and no pullback to absorb the pressure, any flaw in the thesis can trigger a stampede of sellers, with no buyers in sight.

3. A deep divergence: Same technology sector, completely different fates
The most thought-provoking feature of this market action is its extreme structural divergence:
▪ AI infrastructure upstream (computing power, hardware, memory, optical modules): crash-level selloff
▪ Large tech companies downstream (Apple, Microsoft, Google): relatively limited losses. The core logic is crystal clear: regulation constrains disorderly expansion of computing power, benefiting incumbents and hurting new capacity. Large tech companies have ample existing computing capacity and abundant free cash flow; industry supply constraints could actually make their long-term earnings more stable.
Put simply: the selloff is targeting the story of incremental AI growth, while protecting the earnings of established tech companies.
This again confirms that the current correction is a reshaping of sector fundamentals, not a systemic bear market.

4. Outlook: No need to panic, but the investment thesis must change
1. Broad-market indexes: No need to be pessimistic; the century-old rule still holds
History doesn't change easily. The broader trends of looser liquidity after midterm elections, policy uncertainty being resolved, and falling interest rates remain intact. The odds that the U.S. broad market will end higher over the next 12 months are still extremely high.
2. AI hardware: The days of effortless gains are over; a choppy bottoming period lies ahead
Memory, optical communications, computing equipment, and semiconductors had already priced in growth expectations for the next 2-3 years. In the short term, regulatory pressure and crowded-position unwinding mean they will need at least 1-3 months of choppy trading to digest valuations; they won't reverse course immediately. 3. The market's main theme has completely shifted
From "mindlessly betting on computing infrastructure expansion and incremental hardware growth" to "established leaders, compliant AI, and earnings delivery."

5. Final thoughts
Today's historic plunge doesn't mean the century-old rule has failed; it reflects a wholesale correction in the market's thinking. In the past, we believed AI was an unlimited growth story, computing power was an eternal necessity, and policies would always remain accommodative.
Today, the market has sent everyone a costly reminder: no industry can escape regulatory constraints, supply-and-demand cycles, or valuation normalization.
The midterm election results are in. After the short-term release of market anxiety, U.S. stocks won't enter a bear market—but the era of AI's unchecked growth is definitively over. The market ahead won't deliver broad gains for everyone; it will be a structural bull market defined by careful stock selection, earnings, and fundamentals.