Russell 2000 small-cap rally gains momentum as AI trade widens across U.S. market

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Russell 2000 small-cap rally

Highlights

Russell 2000 Index has surged over 21% year-to-date, set for its strongest first-half performance since 1991 amid AI-driven small-cap rotation.
Chip-related companies such as Aehr Test Systems, Ichor Holdings, and MaxLinear have rallied more than 400%, with semiconductors representing 16 of the top 50 performers.
Consensus 2026 earnings growth forecasts for Russell 2000 firms have risen to 38%, but a potential Fed rate hike—60% odds by September—poses significant risk to small caps.

AI-driven gains lift small-cap performance

As reported by CNBC, the Russell 2000 Index has surged more than 21% this year, leaving the benchmark on track for its strongest first-half showing since 1991 as investors rotate into smaller companies tied to the AI buildout.

Much of the advance is concentrated in semiconductor and semiconductor-equipment names, highlighting how spending on AI infrastructure is spreading through a wider supplier base. Chip-related companies make up 16 of the Russell 2000's 50 best-performing stocks this year, including Aehr Test Systems, Ichor Holdings and MaxLinear, all of which have rallied more than 400%.

Amy Zhang, portfolio manager at Alger, says the move reflects both a valuation catch-up and improving fundamentals. She says the gap between small-cap and large-cap valuations had become unusually wide, while operating conditions for smaller companies are now starting to improve.

Rates remain the main risk to the rally

Strategists say the rebound is not relying on AI alone. Adam Turnquist, chief technical strategist at LPL Financial, says small caps are also benefiting from strengthening fundamentals, while consensus forecasts for Russell 2000 companies' 2026 earnings growth have climbed to 38% from about 23% at the start of the year, according to LPL.

Turnquist also points to other supports for the asset class, including greater exposure to the U.S. economy, expectations for more merger-and-acquisition activity, especially in pharmaceuticals and biotechnology, and tax incentives aimed at encouraging capital investment.

The biggest threat remains higher borrowing costs. The Federal Reserve meets next on July 28-29, and traders are pricing in about a 30% chance of a rate increase, according to CME Group's FedWatch tool, while markets see more than a 60% probability of at least one quarter-point hike by September.

That matters more for smaller companies because they tend to carry more floating-rate debt and face larger refinancing needs than large-cap peers. Bank of America estimates that each additional 25-basis-point hike would cut Russell 2000 operating earnings by about 2%, although some investors still believe the worst of the tightening cycle is nearing an end.

Our earlier article on shifting Federal Reserve rate expectations explained how less explicit Fed guidance widened the range of possible rate outcomes and put greater focus on upcoming labor data. We also noted that small-cap stocks such as those in the Russell 2000 are especially sensitive to higher borrowing costs because of heavier leverage and sizable near-term refinancing needs, making further tightening a key risk to their outperformance.

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