Stock Market Today: S&P 500 and Nasdaq Slip as AI Selloff Returns, Oil Tops $110; Dow Holds Gains on Defensive Rotation
Stock Market Today: S&P 500 and Nasdaq Slip as AI Selloff Returns, Oil Tops $110; Dow Holds Gains on Defensive Rotation
New York, Oct. 20, 2026 — U.S. stocks closed mixed on Tuesday, with the S&P 500 and Nasdaq Composite giving back early gains as a renewed selloff in AI infrastructure stocks and a surge in crude oil above $110 a barrel dampened risk appetite, while the Dow Jones Industrial Average climbed on strength in healthcare and financials.
The Dow Jones Industrial Average rose 297.69 points, or 0.57%, to close at 52,263.72. The S&P 500 slipped 10.13 points, or 0.13%, to 7,680.60. The Nasdaq Composite fell 226.56 points, or 0.86%, to 26,204.33 .
Why Did the Nasdaq Fall Today?
The AI trade, which had staged a tentative rebound on Monday, faltered once again as investors questioned the financing models underpinning the massive buildout of data center infrastructure.
1. A disastrous overseas debut reignited AI debt fears. South Korean data-center startup Elice plunged as much as 38% in its Seoul trading debut, finishing the session down 32% . The collapse threatened a fragile recovery in Asian tech stocks and revived concerns that rising borrowing costs and doubtful returns from AI spending could sour investor appetite for the entire sector .
2. CoreWeave and AI infrastructure names resumed their slide. CoreWeave fell 2.9% in premarket trading before paring losses, while Nebius Group and Applied Optoelectronics also came under pressure . The Philadelphia Semiconductor Index reversed early gains, with chipmakers and AI hardware suppliers leading the decline .
3. Oil prices surged past $110, reigniting inflation worries.** Front-month **Brent crude** topped **$110 a barrel, on track for its highest close since May, as attacks on ships in the Persian Gulf intensified . The energy spike added to concerns that inflation could remain elevated, complicating the Fed’s policy path.
Which Sectors and Stocks Held Up?
Healthcare and financials led the Dow’s advance, as investors rotated toward defensive and value-oriented names . 3M gained approximately 5% after raising its full-year profit forecast and expanding its data center cooperation with Amazon . Equifax jumped about 10% after quarterly results significantly beat expectations .
Braze skyrocketed roughly 51% after Salesforce agreed to acquire the company for $5.66 billion .
On the downside, General Motors fell more than 5% despite reporting solid third-quarter results and announcing an additional $20 billion share buyback. Investors focused instead on the company’s narrowed full-year profit outlook . Steel Dynamics slipped 4.5% after its quarterly profit missed estimates .
What Are Treasury Yields and the VIX Saying?
The 10-year Treasury yield traded around 5.129%, slightly lower, as government bonds benefited from safe-haven flows despite the oil spike . The 30-year yield hovered near 5.455% .
Markets have significantly pulled back on bets for an October Fed rate hike. According to LSEG data, investors now price a 92.8% chance that the Fed will hold rates steady at its October 28 meeting . The CME FedWatch tool showed the odds of a 25-basis-point hike at just 14.9%, down from 18.8% a day earlier .
What’s Next for Investors?
All eyes are on this week’s Big Tech earnings, which will serve as a critical test of whether massive AI capital expenditures are translating into profits. Netflix and SpaceX report after Tuesday’s close, followed by Meta Platforms and Tesla on Wednesday . IBM, Lam Research, and Texas Instruments also report Wednesday .
According to Oppenheimer Asset Management, roughly 85% of S&P 500 companies that have reported so far have beaten earnings forecasts, and the firm reiterated its forecast for the S&P 500 to reach 8,100 by year-end .
Key Takeaways (Quick Summary)
- Dow rose 0.57% to 52,263.72; S&P 500 slipped 0.13%; Nasdaq fell 0.86% to 26,204.33
- AI selloff returned: South Korea’s Elice plunged 32% in its trading debut, reviving data-center debt fears
- Brent crude topped $110 on Middle East supply risks, dampening risk appetite
- 3M gained 5% on raised guidance and expanded Amazon data-center partnership
- Braze surged 51% on Salesforce’s $5.66 billion acquisition agreement
- GM fell over 5% despite $20 billion buyback, as investors focused on narrowed outlook
- 10-year Treasury yield held at ~5.13%; October rate hike odds fell to 14.9%
- Big Tech earnings loom: Netflix and SpaceX Tuesday; Meta and Tesla Wednesday
