How Likely Is It That the Stock Market Crashes Under President Donald Trump in the Second Half of 2026? Here’s What History Tells Us.

Key Points

• Historical performance during Trump’s two non‑consecutive terms shows outsized gains for the Dow Jones Industrial Average, the S&P 500, and the Nasdaq Composite.

• Current market valuations are at unprecedented levels, raising concerns for investors.

• Risk appetite among investors has reached elevated levels, a pattern that historically precedes market corrections.

Historical data indicates that Trump’s presidencies have coincided with strong equity returns, yet the market is now among the most expensive in recorded history.

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President Trump delivering remarks. Image source: Official White House Photo.

While history cannot guarantee future outcomes, past patterns suggest an increasing likelihood of a market downturn during the second half of 2026.

This Is the Second‑Priciest Stock Market in History – And That Is Troubling

The most significant warning sign is the elevated valuation of equities.

“Value” is inherently subjective, but the Shiller Cyclically Adjusted Price‑Earnings (CAPE) Ratio provides an objective long‑term perspective. This metric averages inflation‑adjusted earnings over the past ten years and has been tracked for nearly 156 years.

Shiller CAPE Ratio Approaches Its Dot‑Com Peak pic.twitter.com/CtCmSgWnLt

— Barchart (@Barchart) July 11, 2026

Since 1871, the S&P 500’s CAPE Ratio has averaged 17.4. As of August 14, it stood at 42.56, just shy of the current bull‑market high of 42.84 and near its all‑time peak of 44.19 recorded in December 1999.

The CAPE Ratio has exceeded 30 on only six occasions. Each prior instance preceded a decline of 20 % to 89 % in the Dow, S&P 500, or Nasdaq.

While the CAPE Ratio cannot pinpoint the exact timing of a crash, its flawless record of foreshadowing substantial equity declines is well documented.

Margin Debt Is Soaring, Signaling Elevated Risk

Rising margin balances reflect heightened investor leverage and risk‑taking.

FINRA reports that outstanding margin debt has climbed by roughly 67 % over the past 15 months, reaching a record $1.5 trillion. Historical spikes of similar magnitude have preceded major market downturns, including the dot‑com bust, the 2008 financial crisis, and the 2022 bear market.

Parabolic increases in margin debt are therefore a major red flag for the current bull market.

Image source: Getty Images.

Next‑Generation Technologies Have a Checkered History

Artificial intelligence represents the most promising catalyst for future growth, yet historical precedents warn of bubble formation.

Every transformative technology — from the internet to modern computing — has experienced a boom‑and‑bust cycle early in its adoption curve. Investors often overestimate the speed of adoption and implementation.

AI‑related stocks now account for roughly 40 % of the market. pic.twitter.com/RxSAh09k6F

— Geiger Capital (@Geiger_Capital) May 8, 2026

While AI deployment is accelerating, companies are still building the infrastructure needed to fully capitalize on the technology. Optimization — turning capability into profit — typically requires years.

Consequently, another market bubble may be forming, and the current Trump‑era rally could be vulnerable.

Is Buying the S&P 500 Index a Good Idea Right Now?

Before allocating capital to the S&P 500, consider alternative opportunities.

The Motley Fool’s Stock Advisor team recently identified ten stocks they believe offer superior upside potential. Historical picks such as Netflix and Nvidia delivered extraordinary returns when first recommended.

For perspective, a $1,000 investment in Netflix in December 2004 would be worth approximately $432,000 today, while a similar stake in Nvidia made in April 2005 would now be worth over $1.3 million.

While the long‑term average return of Stock Advisor’s recommendations exceeds 967 %, outperforming the broader market, the service’s list is not a guarantee of future performance.

Past performance is not indicative of future results.

Sean Williams has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.

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