The Russell 2000 is up 22% in 2026 — its best start since 1991. AI tailwinds and rate relief are driving the rally. But 40% of the index is unprofitable small businesses, and one Fed hike could change everything.
The last time the Russell 2000 had a first half this good, the US was fighting a war in the Middle East, interest rates were falling, and everyone agreed that small-cap stocks were going to have their moment. That was 1991. Thirty-five years later, the setup is almost identical — and the result has been the same. The Russell 2000 is up 22% in the first half of 2026, its best start since then, crushing every other major US index.
Whether this is a structural shift or a well-timed cyclical trade is the question every portfolio manager is now asking. The answer matters, because the two scenarios have very different second halves.
How 2026’s Major Indices Compare
The Russell 2000’s outperformance looks even more striking when you line it up against every other major benchmark. This is not a case of a rising tide lifting all boats — it is a specific, targeted rotation into small caps while large caps delivered solid but ordinary returns.
| Index | Country | H1 2026 Return | Last time this good |
|---|---|---|---|
| Russell 2000 | United States | +22% | 1991 |
| DAX | Germany | +18% | — |
| Nasdaq 100 | United States | +11% | — |
| S&P 500 | United States | +10% | — |
| Dow Jones | United States | +10% | — |
| Nikkei 225 | Japan | +8% | — |
The AI Trade Didn’t Narrow. It Widened.
The dominant narrative around artificial intelligence has been one of concentration — a handful of mega-cap companies capturing most of the spending, the returns, and the investor attention. Nvidia, Microsoft, Meta, Alphabet. The Magnificent Seven consuming an ever-larger share of S&P 500 market cap. Small caps watching from the sidelines.
What changed in 2026 is that the AI trade broadened. Chip-related companies account for 16 of the Russell 2000’s 50 best-performing stocks this year, with names including Aehr Test Systems, Ichor Holdings, and MaxLinear each surging more than 400%. These are not household names. They are suppliers, testers, and equipment manufacturers sitting in the semiconductor supply chain — companies that benefit from AI infrastructure spending without competing directly with Nvidia or TSMC.
Portfolio manager Amy Zhang at Alger described it plainly: “The impact of AI investment trickles down from large-cap leaders to small-cap companies. The effect will be more amplified for small-cap companies, in terms of revenue and probability growth.”
“Over 30% of the top 50 strongest performers in the Russell 2000 are semiconductor names. The AI trade didn’t stay at the top. It trickled down.”
Three Tailwinds Arriving at the Same Time
The AI supply chain story explains the composition of the rally, but not all of it. Three other forces converged in the first half of 2026 to create conditions unusually favourable for small caps.
Rate relief finally flowing through
The Federal Reserve cut rates by 175 basis points between late 2024 and 2025. That sounds like ancient history now, but the transmission mechanism for small caps is slow. Aberdeen Investments notes that the Fed’s cuts take 12 to 18 months to filter through small-cap balance sheets — meaning mid-2026 is precisely when the earnings benefit of lower floating-rate interest expense begins appearing in reported financials. Nearly 40% of Russell 2000 constituents carry floating-rate debt. For the first time in three years, that debt is a tailwind rather than a headwind.
Valuation gap at a 30-year extreme
At the start of 2026, the Russell 2000 was trading at a forward P/E of approximately 18x versus 26x for the S&P 500 — a 30% discount at a level not seen in a generation. Investors rotating out of expensive mega-cap tech found small caps offering the kind of value that hadn’t been available since the dot-com era. The gap hasn’t fully closed yet, which is why many strategists still see room to run. For more on whether the AI capex cycle can sustain these valuations, see our piece on what happens if the AI trade unwinds.
Domestic revenue insulation
Tariffs, China decoupling, and currency volatility hit multinationals hardest. The Russell 2000 is largely a domestic index — its companies derive the majority of revenue from the US economy. In an environment where global trade is being disrupted and the dollar is volatile, that insulation is worth a premium it hasn’t historically commanded. Track where institutional money is rotating right now on our Sector Rotation Tracker.
The Structural Risk Nobody Wants to Talk About
The bull case is real. The tailwinds are real. But there is a number that should give anyone pause before declaring the Great Rotation a done deal: 40%.
That is roughly the share of Russell 2000 companies that are unprofitable. Not marginally unprofitable — many are burning cash, dependent on continued access to cheap capital, and sensitive to any tightening in financial conditions. The index that looks like a value opportunity on a headline P/E basis contains a substantial tail of companies that would struggle badly if rates stayed higher for longer.
Bank of America estimates that each additional 25 basis-point rate hike would cut Russell 2000 operating earnings by about 2%. With a meaningful probability of a Fed rate hike priced in for September, that is not a theoretical risk. The interest expense burden across the index runs at roughly 31% of EBITDA for Russell 2000 companies versus around 7% for S&P 500 names. The leverage that makes small caps responsive to rate cuts also makes them vulnerable to rate hikes.
Francis Gannon at Royce Investment Partners argues the other side: “To me, higher rates are reflective of the economy doing OK, if not better. I think the earnings story of small caps is outweighing some of the fears of higher rates.” That is a reasonable view if you believe earnings growth will continue to surprise to the upside — consensus 2026 earnings growth forecasts for Russell 2000 firms have risen to 38%, up from about 23% at the start of the year. If those numbers hold, the rate sensitivity becomes manageable. If they don’t, the multiple compression will be sharp.
The Index Just Lost Its Best Performers
There is a structural complication that doesn’t get enough attention. The Russell 2000 undergoes an annual reconstitution — and the June 2026 rebalance removed many of the stocks that powered the first-half rally. According to Bespoke Investment Group, each of the 25 best-performing Russell 2000 constituents prior to the rebalance had gained at least 250% over the past year, and all have now graduated into the Russell 1000.
Think about what that means. The index just graduated its winners. The companies that drove the 22% gain have left the building. What remains is a reconstituted index that looks and behaves differently from the one that produced those returns. The second half of 2026 is being run with a different team — regional banks, domestic industrials, and healthcare names as the likely candidates for new leadership.
The Russell 2000 rally is real and the tailwinds are genuine. But the index heading into H2 is not the same index that produced the H1 returns — the semiconductor winners have left, the rate environment is uncertain, and 40% of what remains is unprofitable. For long-term investors seeking diversification away from Magnificent Seven concentration, small caps still make sense. For anyone trying to replay the first half, the setup is materially different.
Should You Be in It?
The honest answer is: it depends what you are trying to do.
If you are a long-term investor who has been heavily concentrated in S&P 500 index funds — which means you have been heavily concentrated in the Magnificent Seven — adding Russell 2000 exposure is a genuine diversification move. The valuation gap, even after the first-half rally, remains historically wide. The IWM ETF is the simplest route for broad exposure.
For investors who want to be more selective, Bank of America has been pointing clients toward the iShares US Small-Cap Equity Factor ETF, which screens for profitability — more than 80% of its holdings are profitable companies, compared to roughly two-thirds of the broader Russell 2000. That profitability screen matters more than usual right now, given how much of the index’s tail risk is concentrated in unprofitable small businesses that would be the first to feel a rate hike or a demand slowdown.
The 1991 parallel is instructive but not conclusive. That year, small caps had their moment and then gave much of it back as the macro environment shifted. The question for the second half of 2026 is whether the earnings story is strong enough to sustain the rally without the semiconductor tailwind that created it. Earnings season will answer that question faster than any analyst forecast will. For the full picture of where markets stand heading into H2, see our State of Markets Q3 2026 report.
This article represents the editorial opinion of AllinAllSpace and does not constitute financial or investment advice. All market data referenced reflects conditions as of July 2026. Always conduct your own research before making any investment decision.