VB vs IWM ETF Comparison 2026: Vanguard Small-Cap vs iShares Russell 2000: AI Score, Valuation, Performance and Upside
VB and IWM both provide U.S. small-cap equity exposure, with IWM being the standard benchmark vehicle and VB offering a significantly cheaper alternative with a smoother index reconstitution process. IWM is preferred for active trading, options strategies, and institutional benchmark alignment; VB is preferred for cost-conscious long-term investors who want small-cap exposure without paying IWM's premium.
VB vs IWM is a cost-versus-benchmark-liquidity trade-off for small-cap exposure — VB saves nearly 4x in annual expenses with a more efficient index methodology, while IWM provides the deepest liquidity and options market depth for the standard Russell 2000 small-cap benchmark.
VB holds the edge across 5 of 5 key metrics in this comparison. VB has delivered stronger 1-year price return (+15.96% vs +14.52% for IWM).
- prefer the lowest cost small-cap ETF (0.05%) for long-term passive small-cap equity allocation
- value the CRSP methodology's smoother reconstitution process and lower portfolio turnover
- want small-cap core exposure without the small-cap ETF premium for liquidity or benchmark alignment
- are comfortable with a less recognized index benchmark in exchange for dramatically lower costs
- prefer the most liquid small-cap ETF with the deepest options market for tactical allocation and hedging
- value alignment with the Russell 2000 — the globally recognized standard small-cap benchmark
- want to run covered calls, protective puts, or other options strategies on small-cap exposure
- are comfortable paying 0.19% expense ratio for maximum execution flexibility and benchmark tracking
| Metric | VB | IWM |
|---|---|---|
| ETF scorei | 27.1 | 27.0 |
| Latest closei | $291.80 | $279.14 |
| 1M returni | +0.97% | -0.85% |
| 3M returni | -2.33% | -5.52% |
| 6M returni | +3.58% | +0.96% |
| 1Y returni | +15.96% | +14.52% |
The ETF score weights long-term returns and risk-adjusted performance most heavily, but still rewards low expense ratios, larger fund size, and broader diversification — so it can favor low-cost, broad, mega-cap funds over smaller thematic or actively-managed funds even when the latter have delivered stronger returns.
How much would $10,000 be worth today if invested at the start of each period, with all dividends reinvested?
| Period | VB | IWM |
|---|---|---|
| 1Y ago | $11.78K (+17.8%) started 2025-11-03 | $11.61K (+16.1%) started 2025-11-03 |
| 5Y ago | $14.31K (+43.1%) started 2021-11-03 | $13.26K (+32.6%) started 2021-11-03 |
| 10Y ago | $34.62K (+246.2%) started 2016-11-03 | $31.44K (+214.4%) started 2016-11-03 |
Hypothetical — past performance does not guarantee future results.
| Metric | VB | IWM |
|---|---|---|
| Expense ratioi | 0.03% | 0.19% |
| Total assets (AUM)i | $175.77B | $78.04B |
| Dividend yieldi | 1.28% | 0.98% |
| Trailing P/Ei | 19.51 | 16.42 |
| Betai | 1.08 | 1.15 |
| 52-week change | 15.96% | 14.52% |
| Metric | VB | IWM |
|---|---|---|
| 1Y returni | +15.96% | +14.52% |
| 6M returni | +3.58% | +0.96% |
| 3M returni | -2.33% | -5.52% |
| 1M returni | +0.97% | -0.85% |
| 1Y Sharpe ratio | 0.75 | 0.61 |
| Betai | 1.08 | 1.15 |
| Dividend yieldi | 1.28% | 0.98% |
| 5Y CAGR | +5.78% | +4.47% |
Over the past year, VB and IWM have moved strongly in the same direction (correlation of 0.96), based on daily returns.
Lower drawdown and smaller single-period drops generally indicate a smoother ride, though they do not guarantee lower future risk.
| Period | Metric | VB | IWM |
|---|---|---|---|
| 1Y | Growthi | +16.22% | +14.89% |
| CAGRi | +16.28% | +14.94% | |
| Volatilityi | 15.75% | 18.16% | |
| Sharpe ratioi | 0.75 | 0.61 | |
| Sortino ratioi | 1.11 | 0.89 | |
| Max drawdowni | 8.98% | 11.13% | |
| Current drawdowni | 5.38% | 8.27% | |
| Avg drawdowni | 2.45% | 3.13% | |
| Ulcer Indexi | 3.43% | 4.34% | |
| Max daily dropi | 2.44% | 3.55% | |
| Max wkly dropi | 4.30% | 4.62% | |
| 5Y | Growthi | +32.41% | +24.43% |
| CAGRi | +5.78% | +4.47% | |
| Volatilityi | 20.61% | 22.33% | |
| Sharpe ratioi | 0.16 | 0.11 | |
| Sortino ratioi | 0.23 | 0.15 | |
| Max drawdowni | 28.15% | 31.91% | |
| Current drawdowni | 5.38% | 8.27% | |
| Avg drawdowni | 9.77% | 13.57% | |
| Ulcer Indexi | 12.44% | 16.38% | |
| Max daily dropi | 6.72% | 6.42% | |
| Max wkly dropi | 12.92% | 12.38% | |
| 10Y | Growthi | +195.84% | +175.09% |
| CAGRi | +11.46% | +10.65% | |
| Volatilityi | 21.37% | 23.01% | |
| Sharpe ratioi | 0.41 | 0.36 | |
| Sortino ratioi | 0.56 | 0.51 | |
| Max drawdowni | 42.05% | 41.13% | |
| Current drawdowni | 5.38% | 8.27% | |
| Avg drawdowni | 7.28% | 9.95% | |
| Ulcer Indexi | 10.50% | 13.37% | |
| Max daily dropi | 13.08% | 13.27% | |
| Max wkly dropi | 22.91% | 24.00% |
| Category | VB | IWM |
|---|---|---|
| Fund name | Vanguard Morningstar Small-Cap ETF | iShares Russell 2000 ETF |
| Type | ETF | ETF |
| Expense ratioi | 0.03% | 0.19% |
| Total assets (AUM)i | $175.77B | $78.04B |
| Dividend yieldi | 1.28% | 0.98% |
- 0.05% expense ratio is dramatically lower than IWM's 0.19%, saving significant costs over long holding periods
- CRSP index reconstitution methodology reduces turnover relative to the Russell 2000's annual June reconstitution event
- Slightly higher average market cap than IWM provides a marginal quality tilt within the small-cap universe
- Most liquid small-cap ETF globally, with the deepest options market for hedging and tactical strategies
- Alignment with the Russell 2000 benchmark allows investors to measure performance against the standard small-cap index
- Extremely high daily trading volume and tight bid-ask spreads support large institutional block transactions
- IWM is the benchmark for small-cap investors globally — VB's CRSP index is less recognized, potentially causing tracking differences vs small-cap benchmarks
- Lower AUM and trading volume than IWM means slightly wider bid-ask spreads for large trades
- Small-cap stocks are more economically sensitive and tend to underperform in risk-off environments
- 0.19% expense ratio is nearly 4x more expensive than VB's 0.05%
- Russell 2000 annual June reconstitution causes significant turnover and front-running by index arbitrage traders
- Russell 2000 includes more micro-cap and financially distressed companies than CRSP, resulting in higher-risk small-cap exposure
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