The Russell 2000 index, which tracks small-cap companies, has surged by roughly 20% year-to-date and has outperformed the technology-heavy Nasdaq 100. Goldman Sachs analysts warn, however, that the rally may soon lose momentum and investors should not assume the strong gains will continue.
What powered the rally?
Goldman Sachs attributes much of the Russell 2000’s outperformance to investments tied to artificial intelligence (AI) infrastructure. The wave of infrastructure spending that began with large technology firms has gradually reached smaller companies, supporting their stock prices.
Why a reversal is possible
Goldman highlights two main reasons why the index could reverse course:
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Index composition change: In the Russell 2000’s June 2026 reweighting, the weight of stocks linked to AI infrastructure was cut from 15% to 7%, reducing the index’s direct exposure to that theme.
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Rising monetary policy risk: With Kevin Warsh beginning his term at the head of the Federal Reserve, shifts in monetary policy could lead to higher interest rates, which would pose greater risks for small companies.
Financial vulnerabilities among small caps
Goldman notes a significant level of financial fragility within the index. About one-quarter of Russell 2000 constituents are unprofitable, representing roughly 23% of the index’s total market capitalization. That share has increased over the past 20 years and rose further after the reweighting.
Moreover, the Russell 2000 carries a relatively large share of variable-rate debt: roughly 30% of its debt is variable-rate, compared with about 7% for the S&P 500. As a result, a tightening cycle by the Fed would raise borrowing costs more sharply for small-cap companies than for large-cap peers.
Outlook
Given elevated valuations and the U.S. growth backdrop, Goldman Sachs estimates that the Russell 2000 may deliver at most only a few percentage points of return over the next 12 months. The bank advises investors to factor in the increased risks, particularly if monetary policy tightens.
Key figures
- Russell 2000 year-to-date gain: ~20%
- AI-infrastructure weight in Russell 2000: 15% → 7% (June 2026 reweighting)
- Unprofitable Russell 2000 constituents: ~25% of companies, ~23% of market cap
- Variable-rate debt: Russell 2000 ~30% vs S&P 500 ~7%
Whether the Russell 2000’s recent strong performance continues will depend on the evolution of AI-driven investment flows and the course of monetary policy.
