What do Stretched Market Valuations in 2025 Mean for Portfolio Returns?

The S&P 500’s Unprecedented Rally

Since the start of 2023, the S&P 500 has surged more than 50%, building on a remarkable rally of over 150% from its March 2020 pandemic low. These gains have delivered record highs and lifted portfolios, but they’ve also pushed valuations into historically stretched territory. The
S&P 500 now trades at over 21 times its projected earnings for the next 12 months which is a level reminiscent of the late-1990s tech bubble or the post-COVID recovery, when interest rates hovered near zero.

What does this mean for investors? Should you celebrate the recent rally or pause to consider what’s next? While today’s valuations might be cause for concern, recent market experience raises another important question: how can you stay disciplined in a volatile environment?

The fact is that exiting the market during uncertain times or taking on unnecessary risk can lead to costly mistakes. Instead, a balanced, long-term investment strategy remains essential for navigating today’s unique challenges while staying aligned with your financial goals.

 Valuations: A Historical Perspective

Nevertheless, a key question that that we’re trying to answer with today’ analysis is, “how often do we see markets trade at such elevated levels, and what does it mean for portfolios?”

Upon inspection, there is no doubt that the current valuation of the S&P 500 is rare, with broad market indices trading at over 21 times forward earnings which is a figure not commonly seen outside exceptional periods.

And why does this matter? Because while valuations may not dictate short-term performance, they play a critical role in shaping long-term returns. But put more simply, understanding how valuations work can help you as an investor by setting realistic expectations for the years ahead.

Short-Term vs. Long-Term: The Role of Starting Valuations

Indeed, figure 1 helps illustrate why starting valuations matter. It tracks the relationship between the S&P 500’s starting valuation and future returns over various holding periods. The horizontal axis shows the length of the holding period in years, while the vertical axis highlights the R-squared (R²) measure, which quantifies how much one variable explains another.

But what does that mean in practical terms? Well, for example, an R² of 0.40 means 40% of changes in one variable can be linked to the other, with the remaining 60% due to randomness or other factors. This means that in the short term, valuations don’t explain much because there’s a low R² for holding periods of just a few years. But over longer time frames, the relationship strengthens. Because by the 10-year mark, starting valuations explain roughly 80% of return variability, underscoring their importance for patient, long-term investors.

What the Numbers Tell Us: Figures That Matter

Now, if we zoom out and look at valuations and their impact on longer-term returns we see a different picture. Figure 2 shows how the S&P 500’s starting valuation impacts its next 10 years of annualized returns. This is represented by the normalized price-to-earnings (P/E) ratio, which averages inflation-adjusted earnings over the past decade to smooth out short-term noise.

So then, do higher starting valuations always mean lower returns? Historically, yes. The chart slopes downward, revealing that as valuations increase, forward returns tend to decrease. With today’s normalized P/E ratio sitting at 37, which is an extreme level by historical standards, the S&P 500 could deliver low single-digit annualized returns over the next decade.

Balancing Risk in a Stretched Market

Should you be worried about these numbers? The insights are sobering, but they must be placed in context. While history is an invaluable guide, it’s not a crystal ball. Indeed, figure 1 makes it clear that valuations alone don’t predict short-term results, and markets can stay expensive longer than expected. However, when setting expectations for the years ahead today’s valuations be part of the conversation.

Staying the Course: A Strategy for Long-Term Success

To be sure, current market conditions are a clear signal that it’s prudent to avoid taking on unnecessary risk in today’s market environment. Yet, if the past five years have taught us anything, it’s also the importance of steadiness and staying steadfast to your plan.

Because exiting the market during uncertain times or overreacting to short-term fluctuations can jeopardize your long-term financial planning goals. That’s why now, more than ever, it’s essential to strike the right balance and acknowledge today’s risks while staying committed to a disciplined, long-term investment strategy that aligns with your long-term financial plan.