Are We in a Stock Market Bubble?

Assessing Valuations: Context Matters

Global equity markets have climbed to record levels, sparking renewed debate among investors about whether we have entered bubble territory. Concerns over stretched valuations, uneven market breadth and softening economic data have all contributed to this narrative. These discussions are important, but they should be grounded in context. Markets rarely move in a straight line, and corrections — while uncomfortable — are a normal, even healthy, part of the investment cycle.

Valuations, as shown in Exhibit 1, are indeed heightened. The Shiller PE ratio and other major valuation metrics point to expensive conditions relative to both history and global peers. However, valuation alone has never been a reliable timing tool. Expensive markets can become more so without a clear catalyst for reversal, just as cheap markets can remain undervalued for extended periods. Investors should instead view valuation as a guide for long-term return expectations rather than a signal for short-term moves.

A Changed Market: The Evolution of the Index

Comparisons between today’s market environment and the late 1990s tech bubble are common, but they often overlook how the composition of the S&P 500 has evolved. Exhibit 2 highlights this shift clearly. While the weight of technology in the index today is similar to that of the late 1990s, the earnings contribution is dramatically different.

During the tech bubble, valuations rested largely on speculative optimism. Today’s technology leaders — the companies driving much of the recent rally — generate substantial profits, robust free cash flow and strong balance sheets. Their business models are grounded in recurring revenue streams, diversified operations and global scale. This distinction matters: The current market enthusiasm, while elevated, is underpinned by demonstrable earnings power.

Concentration and Earnings Power

Still, concentration risk cannot be ignored. The top 10 companies have driven over 60 percent of year-to-date market returns, raising legitimate questions about sustainability. That said, Exhibit 3 illustrates the strength of these companies’ cash flow growth relative to the rest of the index, while Exhibit 4 highlights their superior earnings expansion compared with the broader market. In short, their strong fundamentals are the driving force behind their growing dominance within the index.

While heavy concentration poses risk if sentiment toward these leaders shifts, there’s reason for optimism. Earnings forecasts for 2026 suggest a broadening in profit growth beyond the dominant mega-cap names. As other sectors begin contributing more meaningfully, the market’s foundation should become more balanced — potentially reducing volatility and improving durability.

The Nature of Bull Markets

It’s worth remembering that bull markets don’t simply end because they’ve lasted a certain number of years. They typically require a catalyst — monetary tightening, an earnings downturn, or a shock to confidence — to unravel. Exhibit 5 puts the current cycle in historical perspective. By age and magnitude, this rally still resembles an early- to mid-stage bull market rather than a late-cycle blowoff. So far, underlying fundamentals — including earnings strength, solid corporate balance sheets, and steady consumer spending — remain supportive. Moreover, sentiment data suggest that this bull market has not yet been fully embraced by investors, which historically has acted as a positive contrarian indicator.

Looking Ahead: Earnings as the Driver

As valuations plateau, earnings growth must shoulder the load for future returns. Exhibit 6 decomposes S&P 500 returns over the past 30 years into contributions from multiple expansion, dividends and earnings growth. The data reveal that recent outperformance has leaned more on earnings than valuation expansion, signaling that corporate profits — not speculative excess — are propelling gains.

Looking forward, the outlook for earnings remains constructive. A resilient corporate sector, ongoing capital investment and a consumer backdrop supported by wealth effects and fiscal stimulus entering the system in 2026 all point to favorable conditions. Meanwhile, the likelihood of less restrictive Federal Reserve policy provides additional support.

Managing Risk While Staying Constructive

Of course, risks deserve attention. Expanding government and corporate debt levels, the rise in leveraged exchange-traded funds and lofty expectations around artificial intelligence could introduce volatility. Leverage works beautifully in up markets but can deepen losses when volatility returns. Corrections are inevitable — but that should not obscure the bigger picture.

A resilient economy, combined with durable profit growth, provides a strong underpinning for equities. While short-term pullbacks are part of any cycle, the broader outlook points to continued opportunity. Investors who remain disciplined and diversified are positioned to capture those gains over time.

Joseph Tanious is chief investment strategist, North America for Northern Trust Asset Management.

IMPORTANT INFORMATION

Northern Trust Asset Management (NTAM) is composed of Northern Trust Investments, Inc., Northern Trust Global Investments Limited, Northern Trust Fund Managers (Ireland) Limited, Northern Trust Global Investments Japan, K.K., NT Global Advisors, Inc., 50 South Capital Advisors, LLC, Northern Trust Asset Management Australia Pty Ltd, and investment personnel of The Northern Trust Company of Hong Kong Limited and The Northern Trust Company.

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