Prediction: Nov. 18 Will Be a Massive Day for the Stock Market

Artificial intelligence (AI) stocks, heavily weighted in the S&P 500, have fueled its direction in recent years. In the early stages of the AI boom, the direction was clearly upward, but in 2026, the major index has delivered a mix of gains and declines. And the tech-heavy Nasdaq Composite even entered correction territory earlier this month.

Though companies in the AI space continue to report significant growth and speak of strong demand, investors have become cautious. Investors are more focused today on headwinds such as rising inflation and risks such as the possibility that the AI revenue opportunity will fall short of expectations. And this is against the backdrop of tremendous spending on AI infrastructure, with tech giants pouring more than $700 billion into the build-out this year.

Considering AI's spot center stage, I predict that Nov. 18 will be a massive day for the stock market. For two reasons. Let's zoom in for a close look.

Image source: Getty Images.

Optimism about AI

First, though, it's important to talk a bit more about what's happened so far. The S&P 500 has soared over the past three calendar years and extended the gain into 2026 on optimism about the potential of AI. The technology is already resulting in explosive earnings growth for companies developing it, but it is also on track to boost the earnings of companies that apply it to their needs. AI has what it takes to make companies more efficient and innovative. As a result, AI could significantly reshape the corporate earnings picture down the road.

Investors jumped to get in on this space, buying shares of AI chip designers like Nvidia and cloud service providers like Alphabet. These stocks and other tech giants, heavily weighted in the S&P 500, set the mood for the entire market. And it was generally positive for quite some time.

This year, however, a more difficult economic backdrop, with higher inflation, has weighed on investors' appetite for growth-oriented companies. Higher prices and potential interest rate hikes aimed at controlling inflation both represent headwinds for these players. Meanwhile, investors have questioned whether companies spending big on AI chips and data centers will be able to successfully monetize the infrastructure.

All of this has made investors particularly attentive to messages from and the actions of leading players in the AI space. And this brings me to my prediction. Nov. 18 may be huge for the stock market because of two events.

Nvidia's earnings report

First, on Nov. 17, after the market closes, AI chip leader Nvidia is scheduled to report third-quarter earnings. The company has reported quarter after quarter of growth and record revenue levels and spoken of ongoing strong demand. Nvidia forecasts revenue of $108 billion for the period and gross margins of 74%. We also may be on the lookout for comments on the rollout of Nvidia's latest platform, Vera Rubin, and first-ever stand-alone central processing units (CPUs). These chips could unlock a $200 billion revenue opportunity for the company.

Nvidia's comments may offer the stock market direction during the following trading session, on Nov. 18, as the company is the key player in the AI story. Excitement about the Anthropic initial public offering may also drive the market on this day. CNBC, citing people familiar with the situation, reports that Anthropic will price on Nov. 18 and begin trading on Nov. 19.

The AI lab, which may enter the market with a trillion-dollar valuation, will offer investors a fresh AI bet. Anthropic, the developer of the famous model Claude, has seen its revenue soar more than 1,200% year over year in the first nine months of this year to about $33 billion. This IPO could provide overall market momentum in the latter part of the week.

So investors should keep their eyes on these two events. I predict they will set the tone, and because of them, Nov. 18 could be an enormous day for the market.

Adria Cimino has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Alphabet and Nvidia. The Motley Fool has a disclosure policy.