IWM vs VTI
Russell 2000 Small-Cap (IWM) vs Total US Market (VTI) — Small-cap tilt or total market exposure?
Understanding IWM and VTI
IWM (iShares Russell 2000 ETF) tracks the Russell 2000 Index, which consists of 2,000 small-cap US companies. Small-caps are younger, faster-growing companies with market capitalizations typically between $300 million and $2 billion. These stocks offer higher growth potential but come with increased volatility.
VTI (Vanguard Total Stock Market ETF) tracks the entire US stock market — approximately 4,000 companies of all sizes. While VTI is market-cap weighted (meaning large-caps dominate), it includes small-caps, mid-caps, and large-caps in one low-cost fund.
The key question: Do you want dedicated small-cap exposure (IWM) or a simple "own everything" approach (VTI)? Over the past 10 years, VTI has returned +265.19% compared to IWM's +153.02%. Large-cap dominance has favored VTI recently, but small-caps historically outperform in economic recoveries.
Head to Head
IWM and VTI serve different purposes — IWM provides pure small-cap exposure while VTI captures the entire market. Compare expense ratios, returns, volatility, and drawdowns to see which fits your investment goals.
| Metric | IWM | VTI | Winner |
|---|---|---|---|
| Expense Ratio | 0.19% | 0.03% | VTI |
| Total Assets | $74.0B | $2.1T | VTI |
| Number of Holdings | ~2,000 | ~4,000 | VTI |
| 1 Year Return | +24.71% | +19.69% | IWM |
| 5 Year Return | +18.49% | +68.78% | VTI |
| 10 Year Return | +153.02% | +265.19% | VTI |
| Volatility (3Y) | 19.2% | 12.2% | VTI |
| Max Drawdown | -52.5% | -50.8% | VTI |
| Current Price | $N/A | $ | — |
Growth of $10,000
The table below shows what $10,000 invested at different points in time would be worth today. The chart visualizes long-term growth starting from the same inception date for both ETFs.
Monthly Returns Comparison
The heatmaps below show month-by-month returns for both ETFs. Green indicates positive months, red indicates negative. Small-caps (IWM) tend to have more extreme swings — bigger gains and bigger losses. Compare the patterns to understand each ETF's behavior during different market conditions.
IWM Monthly Returns
VTI Monthly Returns
Key Differences
IWM (Russell 2000)
- • Tracks 2,000 small-cap US companies
- • Higher growth potential, higher risk
- • More volatile than large-cap indices
- • Can outperform in economic recoveries
- • Best for small-cap tilt/diversification
VTI (Total US Market)
- • Tracks entire US stock market (~4,000 stocks)
- • Includes large, mid, and small caps
- • Market-cap weighted (mostly large-cap)
- • Lower expense ratio, more diversified
- • Best for core "buy the whole market" position
The Bottom Line
Choose IWM if you want dedicated small-cap exposure or believe small-caps will outperform. Choose VTI for a simple, low-cost "own everything" approach to US stocks. Many investors use VTI as their core holding and add IWM to increase small-cap allocation.
Frequently Asked Questions
What is the difference between IWM and VTI?
IWM tracks the Russell 2000 (2,000 small-cap US companies), while VTI tracks the total US stock market (~4,000 companies of all sizes). IWM is pure small-cap; VTI is market-cap weighted and mostly large-cap.
Should I invest in IWM or VTI?
VTI is better as a core holding due to its diversification and low cost. IWM is useful for tilting your portfolio toward small-caps, which historically have higher returns (with more risk) over long periods.
Does VTI already include small-cap stocks?
Yes, VTI includes small-caps, but they make up only about 5-7% of the fund due to market-cap weighting. If you want more small-cap exposure, you can add IWM alongside VTI.
Why is IWM more volatile than VTI?
Small-cap stocks are inherently more volatile — they're younger companies with less stable earnings, more sensitive to economic conditions, and less liquid. VTI's large-cap bias provides more stability.
More ETF Comparisons
Last updated: 3/15/2026