IOO vs. OEF
IOO (iShares Global 100 ETF) and OEF (iShares S&P 100 ETF) are both exchange-traded funds - IOO is a Global Equities fund tracking the S&P Global 100 Index (Net), while OEF is a Large Cap Blend Equities fund tracking the S&P 100 Index. Both are passively managed. Over the past 10 years, IOO returned 16.56%/yr vs 16.65%/yr for OEF. Their correlation of 0.91 suggests significant overlap in exposure. IOO charges 0.40%/yr vs 0.20%/yr for OEF.
Performance
IOO vs. OEF - Performance Comparison
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Returns By Period
In the year-to-date period, IOO achieves a 10.41% return, which is significantly higher than OEF's 8.01% return. Both investments have delivered pretty close results over the past 10 years, with IOO having a 16.56% annualized return and OEF not far ahead at 16.65%.
IOO
- 1D
- 1.21%
- 1M
- -1.32%
- YTD
- 10.41%
- 6M
- 11.38%
- 1Y
- 36.05%
- 3Y*
- 23.70%
- 5Y*
- 16.48%
- 10Y*
- 16.56%
OEF
- 1D
- 1.24%
- 1M
- -0.27%
- YTD
- 8.01%
- 6M
- 8.47%
- 1Y
- 27.60%
- 3Y*
- 22.75%
- 5Y*
- 15.49%
- 10Y*
- 16.65%
IOO vs. OEF - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
IOO iShares Global 100 ETF | 10.41% | 27.02% | 26.54% | 27.71% | -16.34% | 26.03% | 18.61% | 30.01% | -6.22% | 23.56% |
OEF iShares S&P 100 ETF | 8.01% | 19.80% | 30.74% | 32.71% | -21.03% | 29.18% | 21.21% | 31.87% | -4.16% | 21.82% |
Correlation
The correlation between IOO and OEF is 0.96 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.96 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.97 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.97 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.96 |
Correlation (All Time) Calculated using the full available price history since Dec 8, 2000 | 0.91 |
The correlation between IOO and OEF has been stable across timeframes, ranging from 0.91 to 0.97 - a consistent structural relationship.
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Return for Risk
IOO vs. OEF — Risk / Return Rank
IOO
OEF
IOO vs. OEF - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares Global 100 ETF (IOO) and iShares S&P 100 ETF (OEF). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| IOO | OEF | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.45 | ||
| Sortino ratioReturn per unit of downside risk | +0.60 | ||
| Omega ratioGain probability vs. loss probability | 1.44 | 1.37 | +0.07 |
| Calmar ratioReturn relative to maximum drawdown | 3.55 | 2.46 | +1.09 |
| Martin ratioReturn relative to average drawdown | 15.52 | 10.04 | +5.48 |
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Drawdowns
IOO vs. OEF - Drawdown Comparison
The maximum IOO drawdown since its inception was -55.85%, roughly equal to the maximum OEF drawdown of -54.11%. Use the drawdown chart below to compare losses from any high point for IOO and OEF.
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Drawdown Indicators
| IOO | OEF | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.85% | -54.11% | -1.74% |
Max Drawdown (1Y)Largest decline over 1 year | -9.94% | -11.06% | +1.12% |
Max Drawdown (3Y)Largest decline over 3 years | -19.19% | -19.80% | +0.61% |
Max Drawdown (5Y)Largest decline over 5 years | -23.52% | -26.47% | +2.95% |
Max Drawdown (10Y)Largest decline over 10 years | -31.43% | -31.44% | +0.01% |
Current DrawdownCurrent decline from peak | -2.95% | -2.30% | -0.65% |
Average DrawdownAverage peak-to-trough decline | -11.25% | -11.74% | +0.49% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.27% | 2.71% | -0.44% |
Volatility
IOO vs. OEF - Volatility Comparison
iShares Global 100 ETF (IOO) and iShares S&P 100 ETF (OEF) have volatilities of 5.12% and 5.12%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| IOO | OEF | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 5.12% | 5.12% | 0.00% |
Volatility (6M)Calculated over the trailing 6-month period | 11.44% | 10.53% | +0.91% |
Volatility (1Y)Calculated over the trailing 1-year period | 14.13% | 13.31% | +0.82% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.14% | 17.80% | -0.66% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 17.82% | 18.50% | -0.68% |
IOO vs. OEF - Expense Ratio Comparison
IOO has a 0.40% expense ratio, which is higher than OEF's 0.20% expense ratio.
Dividends
IOO vs. OEF - Dividend Comparison
IOO's dividend yield for the trailing twelve months is around 0.84%, less than OEF's 0.87% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
IOO iShares Global 100 ETF | 0.84% | 0.92% | 1.08% | 1.49% | 2.00% | 1.53% | 1.49% | 2.02% | 2.54% | 2.23% | 2.75% | 2.89% |
OEF iShares S&P 100 ETF | 0.87% | 0.81% | 1.03% | 1.19% | 1.55% | 1.06% | 1.43% | 1.87% | 2.09% | 1.81% | 2.07% | 2.11% |
Frequently Asked Questions
With a correlation of 0.96, IOO and OEF move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
OEF has higher volatility (5.12%) compared to IOO (5.12%). In terms of maximum drawdown, IOO dropped -55.85% vs OEF's -54.11%.
On 10-year performance, OEF leads with 16.65% vs 16.56% for IOO. On fees, OEF is cheaper at 0.20% per year. Their volatility is very similar. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 10-year period, OEF has performed better with a 16.65% return vs 16.56%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
OEF is cheaper with a 0.20% expense ratio, compared with 0.40% for IOO.
OEF has the higher dividend yield at 0.87%, compared with 0.84% for IOO.
IOO is categorized as Global Equities, while OEF is Large Cap Blend Equities. IOO tracks S&P Global 100 Index (Net), while OEF tracks S&P 100 Index. Their fees differ too: 0.40% for IOO and 0.20% for OEF.
IOO currently has the higher Sharpe Ratio (2.50 vs 2.05), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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