Low-cost S&P 500 funds are the foundation of many portfolios, yet market concentration in information technology creates portfolio vulnerabilities.
The S&P 500—which accounts for 80% of total U.S. market capitalization—has more than quadrupled in value over the last decade. Because the information technology sector has outperformed, investors face added concentration threats when holding prominent market-weighted index exchange-traded funds such as State Street’s SPY, Vanguard’s VOO, and BlackRock’s IVV.
The information technology sector now comprises about 37% of the total index value. When combined with the communications sector—which includes companies like Meta and Netflix—nearly half of the S&P 500 is concentrated in these sectors. Parallels to the 2000-2002 dot-com bubble have emerged following this structural change, a period that saw the broad S&P 500 plummet by roughly half its worth.
The Bottom Line
- Concentration Risk: Information technology and communications make up almost 50% of the S&P 500.
- Valuation Gap: Forward earnings multiples sit near 20x for the S&P, contrasting with 10-15x valuations found in emerging markets and developed international regions.
- Strategic Defense: Advisors recommend incorporating equal-weighted indexes, small-cap domestic equities, short-term treasuries, and gold to cushion potential market shocks.
The S&P 500 Concentration Trap
“This S&P 500 isn’t your father’s index,” explains Mitch Goldberg, president of ClientFirst Strategy. “It’s super-powered by the information technology sector, which makes up about 37% of total value.” That technological tilt leaves the broader market exposed to volatility.
Furthermore, the five smallest sectors in the index—consumer staples, energy, utilities, real estate, and materials—make up only 14% of the S&P 500. This structural imbalance impacts the overall diversification and risk profile of the index. When a portfolio lacks sector diversification, investors fall victim to recency bias, assuming yesterday’s winners will dictate tomorrow’s returns.
According to Ankur Patel, chief investment officer of Ellevest, investors are paying significantly less for each dollar of earnings overseas, where developed international and emerging markets sit closer to 10-15x forward earnings.
Diversification Alternatives: Small Caps, Dividends, and Cash Equivalents
To bypass the heavy tech exposure of market-cap-weighted funds, strategists advocate looking toward uncorrelated asset classes. Todd Rosenbluth, head of research & editorial at TMX VettaFi, points out that alternatives like small-cap and international equity have been beating the S&P 500 this year. Notable choices feature the iShares Core MSCI Emerging Markets ETF (IEMG) alongside the iShares Core S&P Small-Cap ETF (IJR).
Income-focused investors seeking lower volatility can pivot toward value investments. Neena Mishra, director of ETF research at Zacks Investment Research, highlights funds like the Schwab U.S. Dividend Equity ETF (SCHD). The fund focuses on the quality and sustainability of dividends, with healthcare, consumer staples, and energy receiving the largest allocations.
| Asset Class / Strategy | Primary Representative Ticker | Core Valuation / Allocation Advantage |
|---|---|---|
| S&P 500 Index Fund | Vanguard’s VOO, BlackRock’s IVV and State Street’s SPY | Broad U.S. large-cap exposure; high tech concentration. |
| Small-Cap Domestic Equity | iShares Core S&P Small-Cap ETF (IJR) | Diversification away from mega-caps. |
| Emerging Markets Equity | iShares Core MSCI Emerging Markets ETF (IEMG) | Attractive valuation trading closer to 10-15x forward earnings. |
| Dividend Growth | Schwab U.S. Dividend Equity ETF (SCHD) | Focuses on healthcare, staples, and energy quality payouts. |
| Ultra-Short Fixed Income | iShares 0-3 Month Treasury Bond ETF (SGOV) | Low-risk cash alternative providing steady income. |
| Alternative Store of Value | SPDR Gold MiniShares Trust (GLDM) | Low correlation with traditional asset classes. |
Navigating Fixed Income and the 20% Stress Test
Many investors are still scarred by 2022, when both stocks and bonds nosedived as inflation surged. Longer-duration fixed-income exchange-traded funds carry heightened, built-in risk whenever inflation remains persistently high and interest rates keep fluctuating.
Mishra recommends mitigating this risk through the use of ultra-short Treasury bill ETFs, specifically highlighting the Vanguard 0-3 Month Treasury Bill ETF (VBIL) and the iShares 0-3 Month Treasury Bond ETF (SGOV). These cash-like instruments offer low risk along with a decent level of income. Additionally, maintaining allocations in gold via funds like the SPDR Gold MiniShares Trust (GLDM) or the iShares Gold Trust Micro (IAUM) provides a non-correlated asset.
Ultimately, determining proper asset allocation relies on personal time horizons. Patel advises: “If the S&P 500 fell 20% tomorrow, would it change your plans? If the answer is yes, you’re overexposed.” Money you need in the next few years shouldn’t depend on what Nvidia reports next quarter.
