Last updated: July 2026
This article is for informational purposes only and is not investment advice. See our full Disclaimer for details.
Small-cap stocks — generally companies worth roughly $300 million to $2 billion — get a fraction of the attention large-cap names receive, but they occupy a specific role in many portfolios: more volatility and cyclicality in exchange for a historical long-run return premium over large-cap stocks. That trade-off only makes sense with a long time horizon and a clear understanding of what you’re actually buying, which varies more between small-cap ETFs than you might expect.
This guide compares six of the most widely held small-cap funds, with a specific focus on a structural difference — the profitability screen — that has produced a measurable, persistent performance gap between two of the category’s largest funds.
New to ETFs generally? Our What Is an ETF? guide covers the basics first.
Quick Comparison Table
| ETF | Index Tracked | Expense Ratio | Profitability Screen? | Approx. AUM |
|---|---|---|---|---|
| IJR | S&P SmallCap 600 | 0.06% | Yes | ~$80B |
| IWM | Russell 2000 | 0.19% | No | ~$65B |
| VTWO | Russell 2000 | ~0.06%–0.07% | No | ~$15B |
| VB | CRSP US Small Cap Index | 0.05% | No | Multi-billion |
| SCHA | Dow Jones U.S. Small-Cap Total Stock Market Index | ~0.03%–0.04% | No | Multi-billion |
| AVUV | Active, small-cap value factor | 0.25% | Partial (via active management) | Multi-billion |
Figures are approximate and change regularly as funds rebalance. Always confirm current expense ratios, holdings, and index methodology on each issuer’s official fund page before investing.
1. iShares Core S&P Small-Cap ETF (IJR) — Best for Quality-Screened Exposure
Tracks: S&P SmallCap 600 Index
IJR’s defining feature is a rule most investors don’t realize exists: to be included in the S&P SmallCap 600, a company must show four consecutive quarters of positive GAAP earnings before an index committee will add it. That single screening rule has historically added a measurable performance edge — estimates put the gap at roughly 1.5-2 percentage points per year versus the unscreened Russell 2000 — by filtering out unprofitable, more speculative small companies before they ever enter the index.
Worth knowing: That profitability screen also changes IJR’s sector composition in a specific way — it holds meaningfully less exposure to biotech and other pre-revenue, speculative sectors (roughly 10% versus the Russell 2000’s roughly 17%) than funds without the screen, since early-stage biotech companies are disproportionately unprofitable.
Best for: Long-term, buy-and-hold investors who want small-cap exposure with a built-in quality filter, rather than the full unscreened universe of small companies, including unprofitable ones.
2. iShares Russell 2000 ETF (IWM) — Most Liquid, Best for Active Trading
Tracks: Russell 2000 Index
IWM is the most heavily traded small-cap ETF by a wide margin, with the deepest options market and tightest spreads in the category — a meaningful advantage for active traders or anyone using options strategies around a small-cap position. The Russell 2000 applies no profitability screen, meaning it includes a much broader — and less selective — universe of small companies, including a substantial share (historically around 40%) that aren’t currently profitable.
Worth knowing: IWM’s 0.19% expense ratio is considerably higher than nearly every other fund on this list, without offering different underlying index exposure than cheaper Russell 2000-tracking alternatives like VTWO. For a long-term, buy-and-hold investor who doesn’t need IWM’s superior liquidity or options market, that higher fee is a real, avoidable cost.
Best for: Active traders and options users who specifically need maximum liquidity — not the default choice for simple long-term buy-and-hold exposure.
3. Vanguard Russell 2000 ETF (VTWO) — Lower-Cost Russell 2000 Alternative
Tracks: Russell 2000 Index (same index as IWM)
VTWO tracks the identical Russell 2000 Index as IWM, at a considerably lower expense ratio — making it the more cost-efficient way to access Russell 2000 exposure specifically, for investors who don’t need IWM’s trading liquidity advantages.
Worth knowing: Since VTWO and IWM track the same underlying index, their long-term returns before fees should track closely together — the expense ratio gap is the primary meaningful difference between them for a buy-and-hold investor.
Best for: Long-term investors who specifically want Russell 2000 (rather than S&P 600) exposure, without paying IWM’s premium for trading liquidity they don’t need.
4. Vanguard Small-Cap ETF (VB) — Broad, Low-Cost, Unscreened
Tracks: CRSP US Small Cap Index
VB takes a different indexing approach entirely, tracking Vanguard’s own CRSP-based small-cap index rather than the Russell 2000 or S&P 600. It holds a broader set of companies (over 1,400 holdings) than either of the funds above, at a low 0.05% expense ratio, without a profitability screen.
Worth knowing: VB and SCHA (below) are similar enough in construction and cost that the choice between them often comes down to a single basis point and brokerage preference rather than a meaningful difference in exposure.
Best for: Investors who want broad, low-cost small-cap exposure without the S&P 600’s profitability screen or the Russell 2000’s specific index construction.
5. Schwab U.S. Small-Cap ETF (SCHA) — Lowest-Cost Broad Option
Tracks: Dow Jones U.S. Small-Cap Total Stock Market Index
SCHA is generally the cheapest broad, unscreened small-cap ETF available, undercutting VB by a basis point or two while offering similarly broad diversification across small-cap U.S. companies.
Worth knowing: As with VB, SCHA’s specific index differs somewhat from the Russell 2000 or S&P 600, though the practical difference in exposure and long-term performance among all three broad, unscreened small-cap indexes has historically been modest.
Best for: The most cost-conscious investors seeking broad small-cap exposure without a profitability screen.
6. Avantis U.S. Small Cap Value ETF (AVUV) — Highest Risk, Factor-Based Approach
Strategy: Actively managed, targeting the small-cap value factor
AVUV takes a meaningfully different approach from every other fund on this list. Rather than passively tracking a fixed index, Avantis actively weights the portfolio toward small-cap companies combining cheap valuations with strong profitability and cash generation — the specific factor combination academic research has associated with a persistent small-cap value return premium. The fund holds more than 500 names, with no single position exceeding roughly 1% of assets.
Worth knowing: AVUV has posted a notably stronger recent track record than the broader small-cap category, but it comes with real trade-offs: a considerably higher 0.25% expense ratio (reflecting its active management), a much shorter live track record than long-established index funds, and deeper potential drawdowns tied to its concentrated tilt toward smaller, deeper-value names.
Best for: Investors who specifically understand and want exposure to the small-cap value factor, and who accept higher fees and tracking error against the broader small-cap market as the cost of that targeted exposure.
Why the Profitability Screen Matters So Much
This is worth dwelling on, since it’s the single biggest structural difference separating small-cap funds from each other. The S&P SmallCap 600’s requirement of four consecutive quarters of positive earnings isn’t a subtle tilt — it mechanically excludes a meaningful share of the small-cap universe before the index is even built, disproportionately affecting sectors like early-stage biotech and other pre-revenue companies. That’s the direct, mechanical reason IJR has historically shown a performance edge over unscreened alternatives like IWM, VTWO, VB, or SCHA — not superior stock-picking, but a structural filter built into the index itself.
Small-Cap Volatility: What the Numbers Actually Show
Small-cap stocks are meaningfully more volatile than large-cap stocks, and it’s worth seeing that illustrated with real historical stress-test data rather than as an abstract warning. During the March 2020 COVID crash, VB fell roughly 43% peak-to-trough, compared to roughly 34% for a large-cap fund like VOO over the same stretch. During the 2022 bear market, IWM fell roughly 27% while a large-cap benchmark fell roughly 19% over the same period. This gap is consistent with the broader pattern: small caps tend to fall harder during market stress and have historically also participated strongly in recoveries — a trade-off that only makes sense for investors with a sufficiently long time horizon to ride out that added volatility.
The Interest Rate Connection
Small-cap companies typically carry more debt relative to their size than large-cap companies, and a larger share of that debt is often floating-rate rather than fixed. That structural difference means small caps tend to be more sensitive to interest rate changes than large caps — falling rates can provide a meaningful boost to small-cap profitability by reducing borrowing costs, while a “higher for longer” rate environment tends to weigh more heavily on smaller, more debt-reliant companies. This is part of why small-cap performance has historically shown a stronger relationship with the interest rate cycle than large-cap performance.
Do You Already Own Small-Caps?
If you hold a total-market fund like VTI, you already have some small-cap exposure — VTI’s market-cap weighting means small companies make up roughly 5%-10% of the fund, layered in alongside its large and mid-cap holdings. A dedicated small-cap ETF is generally used to intentionally increase that allocation beyond what a total-market fund’s market-cap weighting provides on its own, not to gain small-cap exposure from zero.
Which Small-Cap ETF Fits Your Situation?
Want the most cost-efficient, quality-screened small-cap exposure for long-term holding: IJR.
Are actively trading or using options strategies around a small-cap position: IWM, despite its higher fee, for the liquidity advantage.
Want Russell 2000 exposure specifically, without paying IWM’s premium: VTWO.
Want the broadest, cheapest small-cap exposure without a profitability screen: SCHA or VB.
Understand and specifically want the small-cap value factor, accepting higher fees and volatility: AVUV.
Frequently Asked Questions
Why has IJR outperformed IWM historically? The primary driver is the S&P SmallCap 600’s profitability screen, which excludes companies without four consecutive quarters of positive earnings before they’re eligible for inclusion — filtering out a segment of unprofitable, more speculative small-cap companies that the unscreened Russell 2000 (which IWM tracks) includes.
Are small-cap ETFs riskier than large-cap ETFs like VOO or VTI? Generally yes, based on historical volatility and drawdown data — small-cap funds have shown deeper declines during major market stress periods (such as the 2020 COVID crash and the 2022 bear market) compared to large-cap benchmarks over the same periods.
Should I choose IWM just because it’s the most well-known small-cap ETF? Not necessarily, unless you specifically need its liquidity or options market. For simple long-term, buy-and-hold exposure to the same Russell 2000 Index, VTWO offers considerably lower ongoing costs with no difference in underlying index exposure.
Is AVUV a better choice than a passive small-cap index fund? It depends on whether you specifically want factor-based, actively managed exposure to the small-cap value premium and are comfortable with a considerably higher expense ratio and shorter track record in exchange. It’s not a strict upgrade over a passive fund like IJR — it’s a different, more targeted strategy with its own trade-offs.
How much of my portfolio should be in small-cap ETFs? There’s no universal answer — it depends on your goals, time horizon, and risk tolerance, and on how much small-cap exposure you already have through a total-market fund like VTI. Most mainstream guidance frames dedicated small-cap funds as a smaller tilt on top of a diversified core rather than a primary holding. This is general information, not a personalized recommendation.
Do small-cap ETFs pay meaningful dividends? Generally less than large-cap dividend-focused funds, since many small-cap companies reinvest earnings into growth rather than paying substantial dividends. Small-cap ETFs are typically held for their growth and return-premium potential rather than for income.
This article reflects publicly available fund data as of the “last updated” date above and is provided for informational purposes only — it is not a recommendation to buy or sell any security. Expense ratios, holdings, index methodology, and performance figures change over time; always verify current data directly on each issuer’s official fund page before making an investment decision. Read our full Disclaimer and Privacy Policy for more information.