The Russell 2000 Index has surged more than 21% in 2026, marking its best first-half performance since 1991 and signaling a sharp turnaround after years of underperformance compared to large-cap stocks [1]. This rally is attributed to both a 'valuation catch-up story and a fundamental story,' according to Amy Zhang, portfolio manager at Alger, who noted that the valuation gap between small and large caps had become exceptionally wide, while fundamentals for small caps are also improving [1].
Unlike previous small-cap booms driven by traditional economic cycles, the current surge is largely powered by the rapid expansion of AI infrastructure. This trend has extended beyond the largest technology companies to a broader network of suppliers, with semiconductor and semiconductor-equipment firms emerging as the biggest winners. Notably, 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, each of which has rallied more than 400% [1].
These smaller companies are not directly competing with industry giants like Nvidia but are instead benefiting from increased demand across the AI supply chain. As chipmakers and cloud providers ramp up AI infrastructure spending, suppliers of semiconductor equipment, components, and connectivity solutions are experiencing amplified revenue and earnings growth, which is particularly significant for companies with smaller market capitalizations [1].
While AI investment is a major driver, strategists emphasize that the small-cap rebound is also supported by broader fundamental tailwinds. Adam Turnquist, chief technical strategist at LPL Financial, highlighted that building fundamental strength has helped offset headwinds from higher interest rates. Consensus forecasts for Russell 2000 companies' 2026 earnings growth have risen to 38% from about 23% at the start of the year, reflecting increased optimism that profit growth is broadening beyond the largest technology firms [1].
CONCLUSION
The Russell 2000's record-setting first half in 2026 is being driven by both the AI investment boom and improving fundamentals across small-cap stocks. With earnings growth forecasts rising and the rally broadening beyond technology, market sentiment remains strongly positive for the small-cap sector.