IWM Has Trailed the S&P 500 for a Decade While Carrying More Risk: The Small-Cap Premium That Never Fully Arrived

Millions of retirement portfolios hold small-cap funds on the promise that extra risk earns extra reward over time. That bargain deserves a hard look at what actually happened across the last decade.

The ETF Examiner desk. Editor: Ryne Mauck.

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Buy smaller companies, accept a rougher ride, and collect a higher return over time. That promise, the small-cap premium, lies behind many retirement portfolios holding the iShares Russell 2000 ETF (NYSEARCA:IWM). Looking at five- and ten-year windows, the rougher ride showed up. The higher return did not.

Here is IWM against the SPDR S&P 500 ETF Trust (NYSEARCA:SPY). These are price returns excluding dividends, measured over identical windows.

Over a decade and five years, the large-cap fund pulled far ahead. IWM currently trades near $279.48, and its holders spent the last decade holding the riskier side of the market for less.

Small caps have run well lately. Over the past year, IWM lies essentially level with SPY, and year-to-date it leads. Retail traders have noticed.

A rally and a premium are different things. A premium is a persistent, long-horizon reward for bearing risk. One strong year inside a decade of shortfall does not establish one. The ride stayed rough even inside the rally.

BlackRock iShares puts IWM’s three-year beta at 1.24 as of August 31, 2026. Beta above 1 means bigger swings in both directions. BlackRock iShares also reports a three-year standard deviation of 19.61%, a gauge of volatility. Higher means bumpier.

In general, IWM holders accepted much more volatility and, over five and ten years, received less. Uncompensated risk is a cost, and it is the one no factsheet lists.

iShares lists Health Care as IWM’s largest sector at 20.57%, ahead of Financials at 18.93% and Information Technology at 13.53%, as of September 28, 2026. The single biggest exposure is a sector where small companies depend on research budgets and binary outcomes, such as clinical trial results or regulatory decisions.

iShares reports a price-to-earnings ratio of 18 and a price-to-book ratio of 2.10. Income offers little buffer. The fund’s 30-day SEC yield currently sits at 1.09% and the trailing twelve-month yield at 0.90%. Simply put, this is a growth holding with slim yields.

iShares states an expense ratio of 0.19% and a typical 30-day bid-ask spread of 0.00%. IWM is cheap to own and trade. For investors looking for a comparable alternative, the Vanguard Russell 2000 ETF (NASDAQ:VTWO) charges just 0.06% and tracks the same Russell 2000.

Small-cap exposure fits an investor with decades of time who wants a balance to an S&P 500 dominated by its largest companies, sizes it as a satellite, and rebalances on schedule. That investor can absorb a beta above 1 and wait out long dry periods.

The investor carrying unpaid risk is the one at or near retirement who held IWM as a core growth engine because small caps were supposed to win over the long run. Over the horizons that matter to that investor, small caps have not, and a rough period in the first years of drawing down does damage that a later rebound cannot fully undo (we walked through that sequence-of-returns problem in a free guide here: The First Five Years).

Before adding to a small-cap position, run one comparison. Pull total returns for IWM and an S&P 500 fund over your own holding period, look at each fund’s standard deviation, and ask whether the extra volatility bought extra return. If it did not, you have been paying for risk that never paid you back.

Contact [email protected] for any questions or corrections.

Ryne Mauck is an investment writer covering exchange-traded funds, retirement planning, and portfolio strategy. Through his work at 24/7 Wall St. and other investment platforms, including Seeking Alpha, he aims to provide clear, research-driven insights that help investors make more informed decisions while maintaining a long-term approach to investing.

Ryne holds a B.Sc. in Finance and an M.A. in Political Science. He is a formerly registered Municipal Advisor Representative and has passed the Series 50, Series 63, and Series 65 exams. His articles are not intended to be, nor should they be interpreted as, financial advice.

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