Wall Street’s Best Day Since April Erases Most of the Post-Midterm AI Rout, Even as Nvidia Sinks on a CEO Probe

Wall Street just made back most of what it lost in last week’s post-election scare. On Monday, November 9, 2026, the S&P 500 jumped 2.35% to 7,549.94, its biggest one-day gain since April 8, while the Nasdaq Composite rose 2.74% to 25,253.14 and the Dow Jones Industrial Average climbed 1,104.02 points, or 2.15%, to 52,389.75, according to Reuters. The rally came from two places at once: falling oil prices, which eased inflation worries, and a sharp rebound in chip stocks. The odd one out was Nvidia, the market’s most important AI stock, which fell more than 4%.

For investors, the day was a useful reminder that a sharp, headline-driven selloff and the long-term trend are two different things. It also showed how much risk now sits with a single company and a single CEO.

What Sent Stocks Down Last Week

Stocks slid last week after Democrats won a sweeping victory in the U.S. midterm elections. Investors feared new rules on data center construction, energy use and development costs could slow the AI infrastructure boom that has carried the market for much of the past two years, CNBC reported. The S&P 500 posted its biggest weekly drop since April 2025, and the Philadelphia Semiconductor Index fell more than 12% for the week, per Reuters.

Some big banks argued the move went too far. Reuters reported that Morgan Stanley and UBS both called last week’s rout in AI stocks overdone, saying the risk of extreme regulation on data centers was low even with Democratic majorities in Congress.

Chips Lead the Rebound

Monday’s recovery was broad. All 11 major S&P 500 sectors rose, nine of them by more than 1%, with industrials and consumer discretionary leading at more than 3% each, according to Reuters. Advancing stocks beat decliners by about 4 to 1 on the New York Stock Exchange.

Semiconductors did the heavy lifting. The Philadelphia Semiconductor Index rose 6.9%, with Advanced Micro Devices up 13.3% and Broadcom up 8.8%, Reuters said. CNBC noted the iShares Semiconductor ETF (SOXX), which dropped about 13% last week, gained more than 7%. Other big tech names joined in: Tesla rose about 5.5%, and Amazon and Microsoft each added close to 3%.

The AI power trade came back too. Constellation Energy, a power producer closely tied to data center demand, jumped more than 10% after its adjusted third-quarter profit beat expectations, while investment firm KKR rose 1.7% after reporting record quarterly profit, according to Reuters.

Nvidia Goes the Other Way

Nvidia was the only decliner in the semiconductor index. The stock fell 4.2% and closed at its lowest level since April 7, Reuters reported, after the company’s board said on Sunday it is opening an investigation into co-founder and CEO Jensen Huang’s relationship with a businesswoman whom U.S. intelligence agencies say is a Chinese spy, according to CNBC. Investors are now asking questions about Huang’s future at the company.

That split matters. Investors bought the AI story broadly while selling the company most identified with it. In other words, the market treated the midterm fear as overdone but treated the Nvidia news as a real, company-specific risk. For anyone who owns an S&P 500 or Nasdaq index fund, Nvidia’s size means a governance problem at one company can still move a large share of their portfolio.

Oil Gives Inflation Hawks a Breather

The second engine of the rally was energy. U.S. West Texas Intermediate crude fell 4.38% to settle at $86.85 a barrel, and Brent dropped 5.85% to $92.57, according to CNBC. Reuters tied the drop to President Donald Trump playing down the chance of renewed strikes on Iran.

Cheaper oil matters because inflation, not just AI, is driving the Federal Reserve. Even with the oil slide, CME FedWatch still shows traders putting better than 80% odds on a rate hike at the Fed’s December meeting, after a strong October jobs report gave the central bank room to keep raising rates, Reuters said. Richmond Fed President Tom Barkin said Monday the Fed should move “with care” as it responds to inflation.

What Investors Should Watch This Week

The rally will face its first real test quickly. The Labor Department releases the October Consumer Price Index on Tuesday and the Producer Price Index on Friday. A hot reading could lock in a December hike and pressure richly valued tech stocks again; a cooler one could extend the rebound.

Earnings from AI-linked companies also arrive this week, with CoreWeave, Cisco and Applied Materials on deck, according to CNBC. Those reports will show whether demand for AI computing, networking and chipmaking equipment is holding up despite the political noise. Investors will also be watching for any update from Nvidia’s board on its investigation.

Why It Matters for Business Readers

• Policy fear moves faster than policy. No new data center rules have passed, yet chip stocks lost more than 12% in a week and got about half of it back in a day. Investors who sold in a panic locked in losses that the market partly reversed within days.
• Concentration is a real risk. Nvidia falling while the rest of the chip sector surged shows how much a single company’s governance can matter. Business owners holding broad index funds, or startups depending on one supplier, should know how exposed they are to one name.
• Energy and rates still set the tone. Oil prices and the Fed’s next move remain as important as the AI story. Companies planning borrowing, hiring or expansion should watch Tuesday’s CPI closely.
• AI spending is still the backbone. Gains in AMD, Broadcom and Constellation Energy suggest investors still believe in the AI infrastructure buildout, even if they now price in more political risk.

The Bottom Line

Monday’s rally put the S&P 500 about 3.4% below its record high set last month, according to AP. It’s a sign that the market sees last week’s midterm-driven selloff as an overreaction, not the end of the AI trade. But the week ahead, with inflation data, key AI earnings and an open question at Nvidia, will decide whether this is a lasting recovery or just a relief bounce. For most long-term investors, the lesson is the familiar one: stay diversified, know your concentration risk, and don’t let one week of headlines make your decisions for you.

Edited by Coron @QUE.COM
Website: https://QUE.COM Intelligence
Sponsored by: https://MAJ.COM AI Autonomous