The Stock Market Is Historically Pricey: Here's How I'm Positioning My Portfolio for 2025

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In roughly a week and a half, Wall Street will turn the page on what will likely be another outstanding year. Even with some mid-week volatility, the iconic Dow Jones Industrial Average (DJINDICES: ^DJI), benchmark S&P 500 (SNPINDEX: ^GSPC), and growth-propelled Nasdaq Composite (NASDAQINDEX: ^IXIC) have respectively risen by 12%, 23%, and 29%, as of the closing bell on Dec. 18. This is well above the average annual return for equities over the long run.

But as is often the case, when things seem too good to be true on Wall Street, they usually are.

A visibly concerned person looking at a rapidly rising then plunging stock chart displayed on a tablet.
Image source: Getty Images.

Based on a handful of valuation tools, we're witnessing one of the priciest stock markets in history. Statistically speaking, there's a heightened possibility of increased volatility and/or downside for the Dow Jones, S&P 500, and Nasdaq Composite in 2025.

Let's take a closer look at what the new year may bring for Wall Street, and I'll share what moves I've made (and not made) in anticipation of a potentially challenging year.

Stocks are historically pricey -- and that's (usually) bad news

For more than a year, there have been a few predictive tools, correlative events, and data points that have foreshadowed imminent trouble for the stock market and/or U.S. economy. Some examples include the first meaningful year-over-year drop in U.S. M2 money supply since the Great Depression, the longest yield-curve inversion in history, and the correlation between Federal Reserve rate-easing cycles and the performance of equities.

However, the most damning of all forecasting tools and data points might just be the S&P 500's Shiller price-to-earnings (P/E) ratio, which is also known as the cyclically adjusted P/E ratio (CAPE Ratio).

The most common of all valuation tools among investors is the traditional P/E ratio, which is arrived at by dividing a company's share price by its trailing-12-month (TTM) earnings per share (EPS). The P/E ratio is a quick and easy way for investors to gauge whether a company is relatively cheap or pricey compared to its peers and the broader market.

But the P/E ratio isn't perfect. It doesn't factor in growth rates and it can be easily disrupted by shock events. For instance, lockdowns during the COVID-19 pandemic rendered TTM EPS unusable for about a year. This is where the Shiller P/E comes in handy.

S&P 500 Shiller CAPE Ratio Chart
S&P 500 Shiller CAPE Ratio data by YCharts.

The S&P 500's Shiller P/E is based on average inflation-adjusted EPS from the prior 10 years. Examining a decade of inflation-adjusted EPS history minimizes the impact of shock events and leads to apples-to-apples valuation comparisons for the broader market.