IWO vs VOO
iShares Russell 2000 Growth ETF vs Vanguard S&P 500 ETF
Which is better, IWO or VOO?
Small Cap Growth against Large Cap Blend.
VOO has a lower expense ratio. VOO led over 1Y, 3Y, 5Y and the full window. IWO is less concentrated, with 6.1% of the fund in its ten largest positions against 37.6%.
MarketXLS is not an investment adviser. This comparison is generated automatically from market data and is for information only. A Best mark means the better reading on that one measure, not a recommendation to buy.
Side-by-Side Comparison
| Metric | IWO | VOO |
|---|---|---|
| Expense Ratio | 0.24% | 0.03%Best |
| AUM | $14.6B | $997.4B |
| Dividend Yield | 0.44% | 1.04% |
| Holdings | 1,125 | 509 |
| YTD Return | +10.33% | +13.31%Best |
| 1Y Return | +11.61% | +17.07%Best |
| 3Y Return (annualized) | +17.97% | +22.72%Best |
| 5Y Return (annualized) | +3.97% | +13.19%Best |
| Volatility (annualized) | 19.9% | 14.1%Best |
| Max Drawdown | -42.0% | -34.3%Best |
| $10,000 over 5 years | $12,149 | $18,580Best |
| Top 10 Weight | 6.1%Best | 37.6% |
| Fund Family | iShares by BlackRock (US) | Vanguard (US) |
| Category | Equity | Equity |
| Style | Small Cap Growth | Large Cap Blend |
| Inception | Jul 24, 2000 | Sep 7, 2010 |
Volatility and max drawdown are measured over the window both funds cover: Sep 9, 2010 to Sep 23, 2026 (16 years).
IWO vs VOO growth
Month-end closes. Both lines start at 0% in the first month shown, so the gap between them is the difference in growth across that window. The full view covers the 16 years both funds cover.
IWO vs VOO Performance
iShares Russell 2000 Growth ETF (IWO) is an ETF from iShares by BlackRock (US) and Vanguard S&P 500 ETF (VOO) is an ETF from Vanguard (US). Over the past year IWO returned +11.61% while VOO returned +17.07%. Year to date, IWO is up 10.33% versus a gain of 13.31% for VOO.
Over three years, IWO compounded at +17.97% per year against +22.72% for VOO; over five years the annualized figures are +3.97% and +13.19% respectively. Across the full 16-year window we track, VOO has the edge at +13.43% annualized vs +11.04%.
Past performance does not guarantee future results.
Risk: Volatility and Drawdowns
IWO has been the more volatile fund, with annualized monthly volatility of 19.9% compared with 14.1% for VOO. Lower volatility generally means a smoother ride, though it often comes with lower long-run returns.
The deepest peak-to-trough decline in our data was -42.0% for IWO and -34.3% for VOO. Drawdown depth is what each fund did in the worst stretch of the window measured above.
The two funds' monthly returns correlate at 0.86. They usually move together, but the gap leaves some room for diversification.
Fees and Cost Over Time
IWO charges 0.24% per year while VOO charges 0.03%. On a $10,000 position that is $24 vs $3 annually, a gap of $21 per year that compounds over a long holding period. On income, IWO currently yields 0.44% against 1.04% for VOO.
Holdings Overlap
We hold position weights for 1,025 holdings in IWO and 494 in VOO, totalling 97.7% and 99.5% of the two funds. The two books name no position in common, so there is no overlap percentage to show.
0 positions in common, counted across the 1,025 positions we hold weights for in IWO and 494 in VOO, against full books of 1,125 and 509.
What only one of them owns
Our book lists 487 positions for VOO that do not appear in our book for IWO (99.2% of the fund), and 875 for IWO that do not appear in VOO (92.4%).
Some of those will be the same company recorded under a different code in one of the two books, so the real difference in what you would own is no larger than this and may be smaller. We do not name the individual positions here for that reason.
You are not choosing between two funds in isolation.
Whichever of IWO and VOO you pick has to sit alongside everything else you own. Add the rest and see what the combination actually holds.
Free for up to 10 holdings. No account needed.
Frequently Asked Questions
Which is cheaper, IWO or VOO?
IWO has an expense ratio of 0.24% while VOO charges 0.03%. VOO is the cheaper option, by $21 a year on a $10,000 investment.
Which performed better, IWO or VOO?
Over the past year IWO returned +11.61% vs +17.07% for VOO, so VOO leads on 1-year performance. Over the longest common window we track (16 years), IWO annualized +11.04% vs +13.43% for VOO. Past performance does not guarantee future results. This is information, not a recommendation.
Which is riskier, IWO or VOO?
IWO has been the more volatile fund at 19.9% annualized versus 14.1% for VOO. Worst drawdown: IWO -42.0% vs VOO -34.3%.
Should I hold both IWO and VOO?
IWO and VOO have a monthly-return correlation of 0.86, so their returns are far enough apart for the mix to behave differently from either one alone. This is information, not a recommendation.
Which pays a higher dividend, IWO or VOO?
IWO yields 0.44% while VOO yields 1.04%, so VOO currently pays the higher dividend yield.
Is VOO better than IWO?
VOO has a lower expense ratio. VOO led over 1Y, 3Y, 5Y and the full window. IWO is less concentrated, with 6.1% of the fund in its ten largest positions against 37.6%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.