Small-cap stocks trimmed in Russell rebalance

The Russell 2000 and Russell Microcap indexes finished their first reconstitution of 2026 in late June. The process now occurs twice a year rather than annually.

The change follows a strong period for small-cap stocks, which have seen their best annual start in over three decades. The Russell 2000 rose 41% over the past 12 months, outpacing the 22% gain of the large-cap Russell 1000.

The Russell Microcap Index, tracking the smallest half of the Russell 2000 plus additional tiny stocks, climbed 59% in the same period. Its weighted average market cap reached $2.5 billion in June, a level that would have qualified for the small-cap Russell 2000 a decade ago. The Russell 2000 now has a weighted average market cap of $8.6 billion, exceeding some current S&P 500 components.

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The biggest reshuffle in years

This year’s June reconstitution marked the largest addition of new stocks to the Russell Microcap Index in nearly five years. The index added 252 companies—about 50% more than last summer—while removing 154, resulting in a net gain of nearly 100 constituents. The increase counters concerns about a shrinking pool of small public companies.

The Russell 2000 added 244 new stocks, moving closer to its 2,000-name target. About a third of those additions came from the Microcap Index. The rest included recent IPOs, a few stocks demoted from large-cap indexes, and companies that recently met eligibility rules. Technology sector representation shrank, while financials and consumer discretionary gained ground, easing worries about overconcentration in AI-related stocks.

Better fundamentals, lower valuations

New entrants in the Microcap Index show stronger fundamentals than the stocks they replaced. A larger share of incoming companies report positive earnings, lifting the index’s aggregate return on equity and operating margins by about 4%. Leverage also dropped. Most constituents are now profitable, and valuations have declined across the board.

The improved quality at lower prices could benefit active managers specializing in small and microcap stocks. It also strengthens the argument for advisors to revisit these segments, particularly for clients seeking diversification beyond large-cap tech.

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The semiannual reconstitution schedule helps indexes keep pace with fast-growing companies. Previously, some stocks outgrew their classification so quickly that they distorted performance until the next annual rebalance. More frequent updates allow these companies to move to the appropriate index sooner, improving accuracy for passive investors and benchmarks for active managers.

The change also accelerates inclusion for companies meeting market-cap requirements but failing other criteria, such as float or share price. Before, they might have waited a full year for the next reconstitution. Now, with a December update added, eligible companies can join six months earlier. This includes firms going public via SPACs, though blank-check firms themselves remain excluded.

For advisors, today’s small and microcap stocks differ significantly from those of a decade ago. The indexes tracking them have also evolved. This year’s reconstitution removed stocks no longer fitting the small-cap universe, making space for newer, often healthier companies. The outcome is a broader, more representative benchmark that may encourage skeptical investors to reconsider.