IWM vs VB: Head-to-Head Comparison
Last updated: March 2026 • Small Cap
Quick Verdict
VB edges out IWM with a stronger Beginner Suitability Score (9 vs 8.5). It offers lower fees for new investors.
Side-by-Side Comparison
Key Differences Between IWM and VB
IWM (iShares Russell 2000 ETF) is a u.s. small-cap blend fund managed by BlackRock. IWM tracks the Russell 2000 index, which includes 2,000 small-cap U.S. companies. Small-cap stocks are younger, faster-growing companies that have historically delivered higher returns than large-caps over very long time periods, but with significantly more volatility. Beginners should view IWM as a way to add growth potential through smaller companies that could become the large-caps of tomorrow.
VB (Vanguard Small-Cap ETF) is a us small-cap fund managed by Vanguard. VB tracks the CRSP US Small Cap Index, providing exposure to a broad range of small U.S. companies with higher growth potential but also more volatility. Small-cap stocks have historically outperformed larger companies over very long periods, though with bumpier rides along the way. This fund is a low-cost way to tap into the entrepreneurial engine of the American economy.
The most notable differences are in fees (0.19% vs 0.05%), number of holdings (1,955 vs 1,400), and 5-year returns (8.20% vs 9.00%).
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Holdings Overlap Analysis
5%
Holdings Overlap
IWM and VB share only 5% of their top holdings. These funds are quite different, making them complementary choices if you want broader market coverage.
Cost Comparison Over Time
If you invest $10,000 and hold for 20 years (assuming 8% annual returns):
IWM
Fee cost: $1,613
VB
Fee cost: $430
Over 20 years, the fee difference amounts to $1,183 on a $10,000 investment. VB saves you more in fees over time.
Which One Should a Beginner Choose?
Choose IWM if: You want investors with a long time horizon who want small-cap growth exposure, those looking to diversify beyond large-cap stocks in their portfolio, investors who believe small-cap stocks are poised for a rebound relative to large-caps. It's managed by BlackRock with an expense ratio of 0.19%.
Choose VB if: You want aggressive long-term investors willing to tolerate higher volatility, portfolio completion strategies needing small-cap representation, investors building a total market portfolio with separate size-based etfs. It's managed by Vanguard with an expense ratio of 0.05%.
Can You Own Both IWM and VB?
Absolutely! With only 5% overlap, IWM and VB complement each other well. A simple portfolio might allocate 60% to one and 40% to the other, or you could pair them with a bond ETF like BND for a complete three-fund portfolio.
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Frequently Asked Questions
Should I buy IWM or VB?▾
VB edges out IWM with a stronger Beginner Suitability Score (9 vs 8.5). It offers lower fees for new investors. However, both are solid options. IWM is best for investors who want investors with a long time horizon who want small-cap growth exposure, while VB is better suited for aggressive long-term investors willing to tolerate higher volatility.
What is the difference between IWM and VB?▾
IWM (iShares Russell 2000 ETF) tracks u.s. small-cap blend investments with 1,955 holdings and a 0.19% expense ratio. VB (Vanguard Small-Cap ETF) focuses on us small-cap with 1,400 holdings at 0.05%. Their top holdings overlap by 5%.
Can I own both IWM and VB?▾
Yes! With only 5% holdings overlap, IWM and VB complement each other well. Owning both gives you broader diversification.