Low-cost S&P 500 index funds remain the backbone of many retirement accounts, but the landscape has shifted: a handful of megacap tech and communications names now dominate returns, creating new concentration risks that matter for investors today—especially those close to drawing on their savings. With market leadership increasingly tied to artificial-intelligence–linked stocks and valuations stretched compared with overseas markets, advisors say rethinking a pure S&P allocation is prudent.
Why the S&P 500’s dominance is raising flags
The S&P 500 has delivered strong long-term gains and accounts for the bulk of U.S. market capitalization, which is why funds such as Vanguard’s VOO, BlackRock’s IVV and State Street’s SPY are staples in many portfolios. But that benefit carries a trade-off: the index’s recent performance has been heavily driven by the information technology and communication services sectors, amplifying both upside and downside risks.
“It’s no longer a broad basket of equally weighted industries—today’s index is skewed toward a small group of winners,” said Mitch Goldberg, president of ClientFirst Strategy, noting the outsized role of tech and related firms. That concentration can leave investors exposed if leadership shifts or sentiment turns quickly.
What S&P-focused investors may be missing
Smaller sectors—consumer staples, energy, utilities, real estate and materials—make up a relatively modest slice of the S&P 500, which reduces the index’s sector diversification. That matters because when a narrow segment drives returns, investors can face larger swings and may miss opportunities elsewhere.
- Equal-weighted S&P — allocates more evenly across companies, boosting exposure to smaller sectors that the market-cap weighted index underrepresents.
- International equities — developed and emerging markets often trade at lower forward price/earnings ratios and can offer different growth drivers.
- Small-cap stocks — historically a source of excess returns over large caps during certain cycles.
- Dividend- and value-oriented ETFs — tilt portfolios toward income and historically steadier sectors such as healthcare and consumer staples.
- Short-term government bonds and cash-like instruments — reduce portfolio volatility and preserve liquidity for near-term needs.
- Commodities such as gold — act as a low-correlation hedge during market stress.
“Diversifying beyond yesterday’s winners reduces the risk of being overly dependent on a single trend,” Goldberg added, urging investors to pair equities with uncorrelated assets rather than piling more into market leaders.
Valuation and opportunity cost
Part of the concern is valuation. Ankur Patel, chief investment officer at Ellevest, points out that the S&P often trades at a higher forward multiple—around 20x—while many international and emerging markets sit nearer 10–15x. That gap implies investors are paying more for future earnings in the U.S., increasing the potential payoff from reallocating some capital overseas.
Todd Rosenbluth, head of research and editorial at TMX VettaFi, notes a practical consequence: “This year, certain small-cap and international funds have outperformed the S&P.” Examples include iShares Core S&P Small-Cap ETF (IJR) and iShares Core MSCI Emerging Markets ETF (IEMG), which have attracted attention as sources of relative outperformance.
For investors worried about volatility, shifting part of a portfolio into dividend-growth or value-oriented ETFs can blunt swings. Neena Mishra, director of ETF research at Zacks, highlights the Schwab U.S. Dividend Equity ETF (SCHD) as an example that tilts away from mega-cap tech and toward sectors with steadier income streams.
Fixed income and safety plays
Within fixed income, many advisors prefer short-duration government paper to long-term bonds, corporate debt or high-yield instruments in the current rate environment. Mishra points to ultra-short Treasury-bill ETFs—like iShares 0–3 Month Treasury Bond ETF (SGOV) and Vanguard 0–3 Month Treasury Bill ETF (VBIL)—as low-risk parking places that still produce modest income.
She also recommends that diversified portfolios include nontraditional hedges such as physical-gold trusts (State Street’s GLDM or BlackRock’s IAUM) because of gold’s historical low correlation with stocks and bonds.
How to judge if you’re overexposed
Practical risk-testing can be surprisingly simple. Patel suggests a straightforward question: if the S&P 500 fell 20% tomorrow, would that force you to change your financial plans? If the answer is yes, your allocation may be too large.
He emphasizes focusing on time horizon—when you’ll need the money—rather than strictly on age. Capital earmarked for a decade or more can afford greater equity exposure; money required within a few years should be shielded from market swings.
Another contemporary factor is the concentrated role of AI-related names. Those companies can bring higher returns but also sharper reversals tied to sentiment shifts and potential regulatory scrutiny. That dynamic makes the case for spreading risk more compelling today than in eras dominated by more diffuse leadership.
Diversification, argued Mishra, is still the closest thing to a “free lunch” in investing: combining assets that don’t move in lockstep can lower overall volatility without necessarily sacrificing long-term returns.
Low-cost S&P 500 ETFs remain an efficient way to build wealth, but advisors say treating them as the only holding ignores important risks. For many investors—particularly those with shorter time horizons or concentrated balances—a mix of international exposure, smaller-cap stocks, dividend strategies, short-duration bonds and alternative hedges can offer a more resilient portfolio.
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Jordan Keller specializes in analyzing the US financial markets. With concrete recommendations, he helps you secure and boost your investments by providing strategies that adapt to market fluctuations.