S&P 500 Outperformed Small Caps Year to Date
The S&P 500 has overtaken the S&P SmallCap 600 as market leadership shifts away from smaller companies.
Updated on Oct. 9, 2026 in Investing
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The S&P 500 has returned 15.0% year to date, narrowly edging out the S&P SmallCap 600, which is up 14.9%. This shift follows a period where smaller companies significantly led the broader market earlier this year.
Why it matters
The S&P SmallCap 600 struggled to keep pace due to its lower weighting in information technology stocks, which have fueled the broader market rally this year. While the S&P 500 holds 40% in technology sector stocks, the SmallCap 600 carries only 13% exposure.
The S&P 500 has risen 15.0% year to date, while the S&P SmallCap 600 has climbed 14.9%. The small-cap index has declined 8% in the third quarter and an additional 1% in October.
The players
S&P 500
A market index tracking 500 large-cap companies that serves as a primary benchmark for U.S. stock market performance.
S&P SmallCap 600
An index representing smaller U.S. companies that typically feature different risk profiles and growth sensitivities than large-cap benchmarks.
The details
The performance gap stems from the concentration of information technology firms in the S&P 500 compared to the S&P SmallCap 600. Because the S&P 500 has a 40% exposure to tech companies compared to just 13% for the SmallCap index, the former benefited more from the AI-driven rally. Despite small-cap stocks outperforming large caps on a sector-by-sector basis, the lower weight of high-growth technology stocks in the smaller-cap index acted as a drag on aggregate performance.
Timeline
Late June 2026: The S&P 600 led the S&P 500 by 15 percentage points.
Q3 2026: The S&P 600 index declined 8%.
October 7, 2026: Small-cap stocks experienced a weak trading session.
October 2026: The S&P 600 has lagged by 1% for the month.
Year to date 2026: The S&P 500 has outperformed the S&P SmallCap 600.
Money Landscape
This development underscores how recent market cycles have favored large-cap technology weightings over broader, diversified holdings. It follows a strong performance period for small caps earlier in the year, marking a shift in market momentum.
If your portfolio is heavily indexed toward small-cap stocks, you may have seen your year-to-date returns trail the broader S&P 500. Investors should review their asset allocation with a financial professional to ensure their exposure aligns with their long-term risk tolerance.
The takeaway
Market leadership is currently concentrated in tech-heavy large caps, which has created a performance divergence from smaller companies. Investors should periodically review their total portfolio weightings against major benchmarks to ensure they remain properly diversified.
Further reading
For more on market benchmarks, visit our Investing section.
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