IOO vs. FXAIX
IOO (iShares Global 100 ETF) and FXAIX (Fidelity 500 Index Fund) are both funds - IOO is a Global Equities fund tracking the S&P Global 100 Index (Net), while FXAIX is a S&P 500 fund tracking the S&P 500 Index. Both are passively managed. Over the past 10 years, IOO returned 16.53%/yr vs 15.25%/yr for FXAIX. Their correlation of 0.94 suggests significant overlap in exposure. IOO charges 0.40%/yr vs 0.02%/yr for FXAIX.
Performance
IOO vs. FXAIX - Performance Comparison
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Returns By Period
In the year-to-date period, IOO achieves a 9.70% return, which is significantly higher than FXAIX's 8.42% return. Over the past 10 years, IOO has outperformed FXAIX with an annualized return of 16.53%, while FXAIX has yielded a comparatively lower 15.25% annualized return.
IOO
- 1D
- 0.27%
- 1M
- -0.80%
- YTD
- 9.70%
- 6M
- 9.96%
- 1Y
- 33.76%
- 3Y*
- 24.64%
- 5Y*
- 16.11%
- 10Y*
- 16.53%
FXAIX
- 1D
- -2.63%
- 1M
- -0.08%
- YTD
- 8.42%
- 6M
- 8.48%
- 1Y
- 24.54%
- 3Y*
- 21.52%
- 5Y*
- 13.40%
- 10Y*
- 15.25%
IOO vs. FXAIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
IOO iShares Global 100 ETF | 9.70% | 27.02% | 26.54% | 27.71% | -16.34% | 26.03% | 18.61% | 30.01% | -6.22% | 23.56% |
FXAIX Fidelity 500 Index Fund | 8.42% | 17.84% | 25.01% | 26.29% | -18.14% | 28.71% | 18.42% | 31.48% | -4.43% | 21.82% |
Correlation
The correlation between IOO and FXAIX is 0.94, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.94 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.94 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.95 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.94 |
Correlation (All Time) Calculated using the full available price history since May 4, 2011 | 0.94 |
The correlation between IOO and FXAIX has been stable across timeframes, ranging from 0.94 to 0.95 - a consistent structural relationship.
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Return for Risk
IOO vs. FXAIX — Risk / Return Rank
IOO
FXAIX
IOO vs. FXAIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares Global 100 ETF (IOO) and Fidelity 500 Index Fund (FXAIX). 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.
| IOO | FXAIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.32 | ||
| Sortino ratioReturn per unit of downside risk | +0.41 | ||
| Omega ratioGain probability vs. loss probability | 1.44 | 1.39 | +0.05 |
| Calmar ratioReturn relative to maximum drawdown | 3.41 | 2.92 | +0.50 |
| Martin ratioReturn relative to average drawdown | 15.65 | 13.57 | +2.08 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| IOO | FXAIX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 2.45 | 2.13 | +0.32 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.95 | 0.79 | +0.15 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.93 | 0.85 | +0.09 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.39 | 0.81 | -0.42 |
Drawdowns
IOO vs. FXAIX - Drawdown Comparison
The maximum IOO drawdown since its inception was -55.85%, which is greater than FXAIX's maximum drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for IOO and FXAIX.
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Drawdown Indicators
| IOO | FXAIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.85% | -33.79% | -22.06% |
Max Drawdown (1Y)Largest decline over 1 year | -9.94% | -8.89% | -1.05% |
Max Drawdown (3Y)Largest decline over 3 years | -19.19% | -18.76% | -0.43% |
Max Drawdown (5Y)Largest decline over 5 years | -23.52% | -24.50% | +0.98% |
Max Drawdown (10Y)Largest decline over 10 years | -31.43% | -33.79% | +2.36% |
Current DrawdownCurrent decline from peak | -3.57% | -2.94% | -0.63% |
Average DrawdownAverage peak-to-trough decline | -11.27% | -3.79% | -7.48% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.16% | 1.91% | +0.25% |
Volatility
IOO vs. FXAIX - Volatility Comparison
iShares Global 100 ETF (IOO) has a higher volatility of 4.47% compared to Fidelity 500 Index Fund (FXAIX) at 3.81%. This indicates that IOO's price experiences larger fluctuations and is considered to be riskier than FXAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| IOO | FXAIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.47% | 3.81% | +0.66% |
Volatility (6M)Calculated over the trailing 6-month period | 11.04% | 9.41% | +1.63% |
Volatility (1Y)Calculated over the trailing 1-year period | 13.88% | 12.19% | +1.69% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.09% | 16.95% | +0.14% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 17.80% | 18.08% | -0.28% |
IOO vs. FXAIX - Expense Ratio Comparison
IOO has a 0.40% expense ratio, which is higher than FXAIX's 0.02% expense ratio.
Dividends
IOO vs. FXAIX - Dividend Comparison
IOO's dividend yield for the trailing twelve months is around 0.84%, less than FXAIX's 1.06% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
FXAIX Fidelity 500 Index Fund | 1.06% | 1.11% | 1.25% | 1.45% | 1.69% | 1.22% | 1.60% | 2.06% | 2.72% | 1.97% | 2.52% | 2.83% |
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% |
Frequently Asked Questions
With a correlation of 0.94, IOO and FXAIX 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.
IOO has higher volatility (4.47%) compared to FXAIX (3.81%). In terms of maximum drawdown, IOO dropped -55.85% vs FXAIX's -33.79%.
IOO currently has the higher Sharpe Ratio (2.45 vs 2.13), 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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