IOO vs VOO
iShares Global 100 ETF vs Vanguard S&P 500 ETF
Quick Verdict
VOO has a lower expense ratio. IOO delivered stronger 1-year returns. VOO offers more diversification with 505 holdings.
Side-by-Side Comparison
| Metric | IOO | VOO | Winner |
|---|---|---|---|
| Expense Ratio | 0.40% | 0.03% | |
| AUM | $8.7B | $979.0B | |
| Dividend Yield | 0.85% | 1.09% | |
| Holdings | 117 | 509 | |
| YTD Return | +14.82% | +13.72% | |
| 1Y Return | +28.23% | +21.63% | |
| 3Y Return (annualized) | +25.51% | +21.55% | |
| 5Y Return (annualized) | +16.03% | +13.26% | |
| Volatility (annualized) | 15.8% | 14.1% | |
| Max Drawdown | -57.9% | -34.3% | |
| Fund Family | iShares by BlackRock (US) | Vanguard (US) | |
| Category | Equity | Equity | |
| Inception | Dec 5, 2000 | Sep 7, 2010 |
IOO vs VOO Performance
iShares Global 100 ETF (IOO) is a ETF from iShares by BlackRock (US) and Vanguard S&P 500 ETF (VOO) is a ETF from Vanguard (US). Over the past year IOO returned +28.23% while VOO returned +21.63%. Year to date, IOO is up 14.82% versus a gain of 13.72% for VOO.
Over three years, IOO compounded at +25.51% per year against +21.55% for VOO; over five years the annualized figures are +16.03% and +13.26% respectively. Across the full 16-year window we track, VOO has the edge at +13.56% annualized vs +5.87%. Past performance does not guarantee future results.
Risk: Volatility and Drawdowns
IOO has been the more volatile fund, with annualized monthly volatility of 15.8% 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 -57.9% for IOO and -34.3% for VOO. Drawdown depth is worth weighing if you expect to sell during market stress rather than ride it out.
The two funds' monthly returns correlate at 0.95. They move almost in lockstep, so holding both mostly duplicates the same exposure.
Fees and Cost Over Time
IOO charges 0.40% per year while VOO charges 0.03%. On a $10,000 position that is $40 vs $3 annually, a gap of $37 per year that compounds over a long holding period. On income, IOO currently yields 0.85% against 1.09% for VOO.
Holdings Overlap
IOO and VOO share 52 holdings out of 555 unique holdings combined, representing a 48.2% weight overlap.
Moderate overlap means holding both could provide meaningful diversification benefits.
Frequently Asked Questions
Which is cheaper, IOO or VOO?
IOO has an expense ratio of 0.40% while VOO charges 0.03%. VOO is the cheaper option. On a $10,000 investment, that is $37 per year of difference.
Which performed better, IOO or VOO?
Over the past year IOO returned +28.23% vs +21.63% for VOO, so IOO leads on 1-year performance. Over the longest common window we track (16 years), IOO annualized +5.87% vs +13.56% for VOO. Past performance does not guarantee future results.
Which is riskier, IOO or VOO?
IOO has been the more volatile fund at 15.8% annualized versus 14.1% for VOO. Worst drawdown: IOO -57.9% vs VOO -34.3%.
Should I hold both IOO and VOO?
IOO and VOO have a monthly-return correlation of 0.95, so they move almost identically. Holding both adds little diversification - most investors pick one, usually on fees or the specific index tracked.
What is the holdings overlap between IOO and VOO?
IOO and VOO share 52 common holdings with a 48.2% weight overlap. Combined, they hold 555 unique securities.
Which pays a higher dividend, IOO or VOO?
IOO yields 0.85% while VOO yields 1.09%, so VOO currently pays the higher dividend yield.
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