Historic Performance Gap Between Small-Caps and S&P 500 in 2026

Key Facts

1The performance gap between the Russell 2000 and the S&P 500 in H1 2026 is the largest since 2001.

2Vanguard Small-Cap Growth ETF offers an expense ratio of 0.05% compared to 0.07% for the Vanguard S&P 500 Growth ETF.

3The small-cap growth fund maintains 550 holdings, providing more diversification than the 146 holdings in the large-cap growth fund.

Amid an investment landscape dominated by mega-cap tech, the performance gap between the Russell 2000 small-cap index and the S&P 500 in the first half of 2026 has reached its widest point since 2001. According to reports, this divergence highlights the massive outperformance of large-cap stocks, even as Vanguard growth ETFs offer competitive low-cost entry points. The Vanguard Small-Cap Growth ETF maintains an expense ratio of 0.05% compared to 0.07% for the Vanguard S&P 500 Growth ETF, while offering significantly broader diversification with 550 holdings versus 146 in the large-cap counterpart.

The underperformance of small-cap stocks coincides with sustained high-interest-rate pressures, which disproportionately impact the borrowing costs of smaller firms compared to their large-cap peers. Looking at competitors, iShares' equivalent small-cap funds have shown conservative cash flow trends over the recent quarter, per market data. While the S&P 500 has been propelled by AI-driven gains, current small-cap valuations are beginning to attract value seekers who view the historic performance gap—unseen in 25 years—as a potential rebalancing opportunity.

Based on data available as of July 10, 2026, traders are watching for economic catalysts that could revive small-cap momentum, particularly as Purchasing Managers' Index (PMI) readings fluctuate across major economies. Technically, support levels for small-cap indices remain sensitive to monetary policy outlooks. Investors will closely monitor upcoming commentary from Fed officials for signals regarding future interest rate paths, which could be the primary driver for narrowing the current pricing gap between these benchmarks.