IOO vs VOO
iShares Global 100 ETF vs Vanguard S&P 500 ETF
Which is better, IOO or VOO?
Nearly the same fund. VOO costs less.
VOO has a lower expense ratio. IOO led over 1Y, 3Y and 5Y, VOO over the full window. The two have moved almost in lockstep, correlation 0.95. VOO is less concentrated, with 36.4% of the fund in its ten largest positions against 57.8%.
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 | IOO | VOO |
|---|---|---|
| Expense Ratio | 0.40% | 0.03%Best |
| AUM | $9.2B | $997.4B |
| Dividend Yield | 0.84% | 1.08% |
| Holdings | 117 | 509 |
| YTD Return | +15.16%Best | +13.81% |
| 1Y Return | +27.82%Best | +21.53% |
| 3Y Return (annualized) | +25.23%Best | +21.46% |
| 5Y Return (annualized) | +15.78%Best | +12.87% |
| Volatility (annualized) | 14.4% | 14.1%Best |
| Max Drawdown | -31.4%Best | -34.3% |
| $10,000 over 5 years | $20,805Best | $18,319 |
| Top 10 Weight | 57.8% | 36.4%Best |
| Fund Family | iShares by BlackRock (US) | Vanguard (US) |
| Category | Equity | Equity |
| Style | Large Cap Blend | Large Cap Blend |
| Inception | Dec 5, 2000 | Sep 7, 2010 |
Volatility and max drawdown are measured over the window both funds cover: Sep 9, 2010 to Sep 3, 2026 (16 years).
IOO 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.
IOO vs VOO Performance
iShares Global 100 ETF (IOO) 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 IOO returned +27.82% while VOO returned +21.53%. Year to date, IOO is up 15.16% versus a gain of 13.81% for VOO.
Over three years, IOO compounded at +25.23% per year against +21.46% for VOO; over five years the annualized figures are +15.78% and +12.87% respectively. Across the full 16-year window we track, VOO has the edge at +13.51% annualized vs +11.36%.
Past performance does not guarantee future results.
Risk: Volatility and Drawdowns
IOO has been the more volatile fund, with annualized monthly volatility of 14.4% 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 -31.4% for IOO 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 0.95. 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 0.84% against 1.08% for VOO.
Holdings Overlap
79.9% of IOO's money is in holdings VOO also owns. 48.3% of VOO's money is in holdings IOO also owns.
Most of IOO is already inside VOO. Owning both mostly buys the same companies twice.
52 positions in common, counted across the 102 positions we hold weights for in IOO and 505 in VOO, against full books of 117 and 509.
What only one of them owns
Our book lists 445 positions for VOO that do not appear in our book for IOO (51.2% of the fund), and 6 for IOO that do not appear in VOO (1.4%).
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.
Top Shared Holdings
| Stock | Weight in IOO | Weight in VOO | Difference |
|---|---|---|---|
| NVDANvidia Corp. | 11.84% | 7.51% | 4.33% |
| AAPLApple, Inc | 11.48% | 6.59% | 4.89% |
| MSFTMicrosoft Corp 4.100 Feb 06 37 | 7.18% | 4.30% | 2.88% |
| AMZNAmazon.Com Inc | 5.97% | 3.62% | 2.35% |
| GOOGLAlphabet Inc.Class A | 5.37% | 3.25% | 2.12% |
| AVGOBroadcom Inc | 4.42% | 2.77% | 1.65% |
| GOOGAlphabet Inc. C | 4.31% | 2.59% | 1.72% |
| LLYEli Lilly & Co. | 2.37% | 1.47% | 0.90% |
| JPMJpmorgan Chase | 2.26% | 1.26% | 1.00% |
| JNJJohnson & Johnson - Common | 1.56% | 0.95% | 0.61% |
79.9% of IOO is already inside VOO.
You probably hold more than these two. Add the rest and see how much of the whole book is the same companies twice.
Free for up to 10 holdings. No account needed.
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, by $37 a year on a $10,000 investment.
Which performed better, IOO or VOO?
Over the past year IOO returned +27.82% vs +21.53% for VOO, so IOO leads on 1-year performance. Over the longest common window we track (16 years), IOO annualized +11.36% vs +13.51% for VOO. Past performance does not guarantee future results. This is information, not a recommendation.
Which is riskier, IOO or VOO?
IOO has been the more volatile fund at 14.4% annualized versus 14.1% for VOO. Worst drawdown: IOO -31.4% 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. What is left to separate them is the fee and the index each one tracks. This is information, not a recommendation.
What is the holdings overlap between IOO and VOO?
79.9% of IOO's money is in holdings VOO also owns. 48.3% of VOO's is in holdings IOO also owns. They hold 52 positions in common, counted across the 102 positions we hold weights for in IOO and 505 in VOO.
Which pays a higher dividend, IOO or VOO?
IOO yields 0.84% while VOO yields 1.08%, so VOO currently pays the higher dividend yield.
Is VOO better than IOO?
VOO has a lower expense ratio. IOO led over 1Y, 3Y and 5Y, VOO over the full window. The two have moved almost in lockstep, correlation 0.95. VOO is less concentrated, with 36.4% of the fund in its ten largest positions against 57.8%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.