Small-cap stocks enjoy their best first half in 35 years. Here's what's driving it

Small-cap equities have posted their strongest first-half performance in 35 years, signaling a meaningful shift in market leadership dynamics away from the mega-cap concentration that dominated 2023. This reversal reflects investor repositioning toward value and cyclical exposure, traditionally overweighted in small-cap indices versus large-cap benchmarks.

The rotation into smaller names typically accelerates when macroeconomic conditions stabilize and growth expectations broaden beyond artificial intelligence and software ecosystems. Declining rate expectations and softening inflation narratives have reduced the duration premium favoring mega-cap mega-cap defensives, allowing smaller-cap companies with higher leverage to economic cycles to re-attract capital. Semiconductor and industrial sub-segments within small-cap universe—represented by names like MXL and AEHR—have benefited disproportionately from this rebalancing.

The 35-year benchmark is significant; it indicates this is not merely a quarterly momentum shift but rather a structural preference reset. Small-cap indices carry higher earnings volatility and liquidity constraints, so sustained outperformance requires confidence in both earnings growth and capital market resilience. This rotation carries implications for hedge fund positioning and risk parity strategies, which typically underweight small-caps during periods of elevated uncertainty.

Sector implication: Technology and Industrials expose within the small-cap sleeve will likely remain in favor if inflation remains controlled and lending conditions ease further. However, this rally remains vulnerable to any resurgence in large-cap earnings surprises or macroeconomic deterioration.