IOO vs. FZROX
IOO (iShares Global 100 ETF) and FZROX (Fidelity ZERO Total Market Index Fund) are both funds - IOO is a Global Equities fund tracking the S&P Global 100 Index (Net), while FZROX is a Large Cap Blend Equities fund managed by Fidelity. Over the past 5 years, IOO returned 15.85%/yr vs 12.34%/yr for FZROX. Their correlation of 0.93 suggests significant overlap in exposure. IOO charges 0.40%/yr vs 0.00%/yr for FZROX.
Performance
IOO vs. FZROX - Performance Comparison
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Returns By Period
The year-to-date returns for both stocks are quite close, with IOO having a 9.16% return and FZROX slightly lower at 9.14%.
IOO
- 1D
- 0.11%
- 1M
- -2.09%
- YTD
- 9.16%
- 6M
- 10.36%
- 1Y
- 31.99%
- 3Y*
- 23.85%
- 5Y*
- 15.85%
- 10Y*
- 16.66%
FZROX
- 1D
- 1.90%
- 1M
- 0.00%
- YTD
- 9.14%
- 6M
- 9.23%
- 1Y
- 24.28%
- 3Y*
- 20.84%
- 5Y*
- 12.34%
- 10Y*
- —
IOO vs. FZROX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | |
|---|---|---|---|---|---|---|---|---|---|
IOO iShares Global 100 ETF | 9.16% | 27.02% | 26.54% | 27.71% | -16.34% | 26.03% | 18.61% | 30.01% | -9.13% |
FZROX Fidelity ZERO Total Market Index Fund | 9.14% | 17.23% | 23.94% | 26.20% | -19.21% | 26.00% | 20.51% | 31.15% | -12.72% |
Correlation
The correlation between IOO and FZROX is 0.92, 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 | 0.92 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.91 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.93 |
Correlation (All Time) Calculated using the full available price history since Aug 16, 2018 | 0.93 |
The correlation between IOO and FZROX has been stable across timeframes, ranging from 0.91 to 0.93 - a consistent structural relationship.
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Return for Risk
IOO vs. FZROX — Risk / Return Rank
IOO
FZROX
IOO vs. FZROX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares Global 100 ETF (IOO) and Fidelity ZERO Total Market Index Fund (FZROX). 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 | FZROX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.35 | ||
| Sortino ratioReturn per unit of downside risk | +0.45 | ||
| Omega ratioGain probability vs. loss probability | 1.41 | 1.35 | +0.06 |
| Calmar ratioReturn relative to maximum drawdown | 3.23 | 2.78 | +0.45 |
| Martin ratioReturn relative to average drawdown | 14.35 | 12.51 | +1.84 |
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Drawdowns
IOO vs. FZROX - Drawdown Comparison
The maximum IOO drawdown since its inception was -55.85%, which is greater than FZROX's maximum drawdown of -34.96%. Use the drawdown chart below to compare losses from any high point for IOO and FZROX.
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Drawdown Indicators
| IOO | FZROX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.85% | -34.96% | -20.89% |
Max Drawdown (1Y)Largest decline over 1 year | -9.94% | -8.89% | -1.05% |
Max Drawdown (3Y)Largest decline over 3 years | -19.19% | -19.38% | +0.19% |
Max Drawdown (5Y)Largest decline over 5 years | -23.52% | -25.12% | +1.60% |
Max Drawdown (10Y)Largest decline over 10 years | -31.43% | — | — |
Current DrawdownCurrent decline from peak | -4.05% | -2.57% | -1.48% |
Average DrawdownAverage peak-to-trough decline | -11.26% | -5.50% | -5.76% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.24% | 1.97% | +0.27% |
Volatility
IOO vs. FZROX - Volatility Comparison
iShares Global 100 ETF (IOO) and Fidelity ZERO Total Market Index Fund (FZROX) have volatilities of 4.82% and 4.66%, 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 | FZROX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.82% | 4.66% | +0.16% |
Volatility (6M)Calculated over the trailing 6-month period | 11.31% | 9.98% | +1.33% |
Volatility (1Y)Calculated over the trailing 1-year period | 14.07% | 12.76% | +1.31% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.12% | 17.51% | -0.39% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 17.80% | 20.14% | -2.34% |
IOO vs. FZROX - Expense Ratio Comparison
IOO has a 0.40% expense ratio, which is higher than FZROX's 0.00% expense ratio.
Dividends
IOO vs. FZROX - Dividend Comparison
IOO's dividend yield for the trailing twelve months is around 0.84%, less than FZROX's 0.94% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
FZROX Fidelity ZERO Total Market Index Fund | 0.94% | 1.02% | 1.16% | 1.36% | 1.57% | 1.25% | 1.27% | 1.51% | 0.00% | 0.00% | 0.00% | 0.00% |
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 0.92, IOO and FZROX 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 (4.82%) compared to FZROX (4.66%). In terms of maximum drawdown, IOO dropped -55.85% vs FZROX's -34.96%.
IOO currently has the higher Sharpe Ratio (2.28 vs 1.94), 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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