Stock market crash or correction? Why the Nasdaq fell 5.5% on November 5

US stocks had their worst day in 19 months on Thursday, November 5, 2026. The S&P 500 fell 4.36% and the Nasdaq Composite 5.52%, which left the Nasdaq 11.9% under its October 6 record. A drop of 10% from a high is a correction, so that is where the Nasdaq stands. A crash usually means 20% or more in days or weeks, and neither index is there.

AI stocks took the worst of it, on fears that the new Democratic Congress will slow the data center build-out. The finance accounts we track had turned less bullish on those stocks in the three days before the drop, and kept their calls on the rest of the market upbeat.

What happened on November 5

The selling started in chips and spread. All 11 S&P 500 sectors closed lower, and technology fell 7.30%, its worst day since March 16, 2020, CNBC reported.

• Chips: the Philadelphia Semiconductor Index fell more than 12%. Nvidia fell 9.26% to $181.60 and lost more than $440 billion of market value. AMD fell 17.3%.
• The biggest tech names: the Magnificent 7 lost more than $1 trillion of value between them. Tesla fell 10.77%.
• AI data centers: CoreWeave fell 9.8%, and IREN, Applied Digital and Nebius each fell more than 14%.
• Losers beat winners: on the Nasdaq, 4,166 stocks fell and 855 rose.

The Dow lost 1,833.06 points, which wiped out its 3.03% gain on November 4, the day after the election. On Friday morning in Asia, Japan's Nikkei fell 5.88% and South Korea's Kospi 6.06%, after a circuit breaker paused trading in Seoul at the open.

Why the stock market fell

Democrats won the House and the Senate on November 3. On November 5, investors sold the companies that sell into AI data centers, on the fear that a Democratic Congress will slow new projects through tighter rules on power, water and permits.

In Texas, Gina Hinojosa ran for governor on halting new data center approvals in the state until lawmakers set rules for them. Texas is one of the biggest data center markets in the country, and the chip, networking and cloud companies that sold off hardest depend on those projects getting built.

AI stocks were already down before the vote. The Nasdaq peaked on October 6, and AI stocks spent October falling on rates, earnings and debt worries, which our AI bubble breakdown covers. Specialist GPU clouds such as CoreWeave and Nebius, known as neoclouds, borrow heavily to build, so they have the least room if projects slow.

How it compares to past stock market crashes

On this scale, November 5 sits at the small end. Black Monday in 1987 took more than a fifth off the S&P 500 in one session, and on Black Tuesday in 1929 the Dow lost another 11.7% after falling 12.8% the day before.

The recoveries split two ways. The 2020 and 2025 drops came from a shock outside the market and were back at their highs within months. The dot-com bust and 2008 began with prices or debt that had run too far, and took years. AI bears argue this one is the second kind, spending that ran ahead of revenue; the bulls point to the profits the biggest buyers earn.

What the accounts we track said before the drop

We looked at 13 AI chip, optics and data center stocks: Nvidia, AMD, Broadcom, Micron, TSMC, Marvell, CoreWeave, Nebius, IREN, Oracle, Coherent, Lumentum and Applied Optoelectronics.

Over the 30 days to November 1, the finance accounts we track called those stocks bullish 70% of the time, 2,855 calls to 1,216. From November 2 to 4, the three days before the drop, that fell to 62%, 408 to 252, while daily mentions of them rose 60%. Their calls on every other stock went the other way, to 69% bullish from 65%.

The accounts with a graded track record moved further. They were 80% bullish on the 13 AI stocks in the prior 30 days and 67% from November 2 to 4, while their calls on other stocks held at about 75%. Lumentum shows the turn: 208 bullish calls to 25 over the 30 days, then 69 to 57 from November 2 to 5.

On November 5 itself, the accounts we track called the AI names 65% bullish, 162 to 89, up from the three days before. Graded accounts were at 62%. They had cut their bullish share on these stocks in the days before chips fell 12%, and stayed cautious on the day itself.

What long-term investors can take from it

None of this says what to buy or sell. A few things hold across the table above.

• Corrections are common. CFRA has counted 24 falls of 10% or more from a record since World War II that stopped short of a 20% bear market. On average, the S&P 500 took about eight months to get back to its high, the Associated Press reported in March 2025.
• Big up days sit next to big down days. The Dow rose 3.03% on November 4 and fell 3.44% on November 5. Selling after a day like that often means missing the rebound, which long-term investing and market sentiment walks through.
• A first bounce can fail. Sharp rallies inside a falling market are common, and a dead cat bounce explains how to tell them apart.
• Know what you own. A 12% day for chip stocks shows what heavy AI exposure feels like. If it felt like more risk than you signed up for, check your mix before the next one. Investors who keep adding on a schedule use dollar-cost averaging to take the timing out of it.

What to watch next

1. The October jobs report, Friday November 6 at 8:30 a.m. ET. A strong number can push rates up and hit tech, which what is the jobs report explains.
2. Asia's reaction. The Nikkei and Kospi each fell about 6% on Friday.
3. Nebius earnings, Thursday November 12, before the open. Our Nebius stock page has the setup.
4. Nvidia earnings, Tuesday November 17, after the close. The bull and bear cases are in our Nvidia stock forecast.
5. The rules themselves. What the new Congress and Texas do on data center approvals, which will take months to show.

The stock market is open on Veterans Day, November 11; the bond market is closed. Other dates are in stock market holidays.

Common questions

Is the stock market crashing?

Not by the usual definition. The S&P 500 fell 4.36% and the Nasdaq 5.52% on November 5, 2026, the worst day since April 2025. The Nasdaq closed 11.9% under its October 6 record, which is a correction. A crash usually means a fall of 20% or more in days or weeks.

Will the stock market crash more?

No one can say ahead of time. Since World War II, most falls of 10% stopped short of 20%. Friday's jobs report, the Nebius and Nvidia earnings in the next two weeks, and any action on data center rules are the things most likely to move AI stocks from here.

What should I do if the stock market crashes?

We don't give buy or sell advice. Long-term investors usually start by checking whether they still believe the reasons they bought, and whether their mix of stocks matches the risk they can live with. Selling right after a big down day has often meant missing the rebound.

Is this like the dot-com bubble?

In part. Both times, a new technology pulled in money faster than it earned revenue. The difference is profits: the biggest AI companies earn a lot and pay for much of the build-out from cash flow, which most dot-com companies could not. The Nasdaq is down 11.9%; in the dot-com bust it fell 78%.

How long do stock market corrections last?

CFRA's count of 24 corrections since World War II that did not become bear markets puts the average at about eight months to get back to the old high. Bear markets vary more: after the 2020 shock the S&P 500 was back at its high within six months, while the 2000 and 2008 bear markets took years.

Where to follow the mood

Quantral is an investment ideas app built on alternative data. It shows how the finance accounts and communities we track feel about each stock, with a score that gives more weight to authors with a proven track record, and every call behind it. Nvidia's 7-day score was 65 early on November 6. It runs on the web at app.quantral.com, on iOS and on Android, with a 7-day free trial on the yearly plan. For the rest of the group, start with our AI infrastructure stocks list, or see the monthly stock market sentiment reading.

Index closes, stock moves and market breadth for November 5, 2026, are from CNBC, Fox Business and NBC. Historical crash figures are closing levels; the CFRA correction count is from the Associated Press, March 2025. Mention counts cover the accounts Quantral tracks, by US Eastern calendar day: October 3 to November 1, 2026, for the 30-day comparison, and November 2 to 5 for the days around the drop. Graded accounts have more than ten resolved calls, most of them right. Positions attributed to accounts are their views, not Quantral's. Nothing here is financial advice or a recommendation to buy or sell. Past signals are not indicative of future results.