MAILX vs. FAOSX
MAILX (BlackRock International Fund of BlackRock Series, Inc.) and FAOSX (Fidelity Advisor Overseas Fund Class Z) are both Foreign Large Cap Equities funds. Over the past 5 years, MAILX returned 2.38%/yr vs 2.86%/yr for FAOSX. Their correlation of 0.85 means they have usually moved in the same direction. MAILX charges 0.65%/yr vs 1.02%/yr for FAOSX.
Performance
MAILX vs. FAOSX - Performance Comparison
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Returns By Period
MAILX
- 1D
- 2.96%
- 1M
- 0.71%
- 6M
- 4.60%
- YTD
- 9.99%
- 1Y
- 23.33%
- 3Y*
- 9.20%
- 5Y*
- 2.38%
- 10Y*
- 7.88%
- ALL TIME*
- 4.60%
FAOSX
- 1D
- 0.00%
- 1M
- 0.00%
- 6M
- 0.00%
- YTD
- 0.00%
- 1Y
- -0.26%
- 3Y*
- 7.96%
- 5Y*
- 2.86%
- 10Y*
- —
- ALL TIME*
- 8.10%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
MAILX vs. FAOSX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
MAILX BlackRock International Fund of BlackRock Series, Inc. | 9.99% | 15.60% | 0.46% | 19.67% | -24.24% | 9.32% | 21.82% | 31.77% | -21.45% | 28.39% |
FAOSX Fidelity Advisor Overseas Fund Class Z | 0.00% | 15.36% | 5.06% | 20.52% | -24.31% | 19.42% | 15.17% | 27.96% | -14.73% | 26.25% |
Correlation
The correlation between MAILX and FAOSX is 0.41, which is low. Their historical price movements had little consistent relationship.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.41 |
Correlation (3Y) Balances recent behavior with more history. | 0.74 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.83 |
Correlation (All Time) Calculated using the full available price history since Feb 1, 2017 | 0.85 |
Over the past year, the correlation between MAILX and FAOSX has dropped to 0.41 - well below their long-term average of 0.85, suggesting their price drivers have been diverging.
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Return for Risk
MAILX vs. FAOSX — Risk / Return Rank
MAILX
FAOSX
MAILX vs. FAOSX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for BlackRock International Fund of BlackRock Series, Inc. (MAILX) and Fidelity Advisor Overseas Fund Class Z (FAOSX). 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.
| MAILX | FAOSX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +1.62 | ||
| Sortino ratioReturn per unit of downside risk | +2.25 | ||
| Omega ratioGain probability vs. loss probability | 1.24 | 0.93 | +0.31 |
| Calmar ratioReturn relative to maximum drawdown | 1.78 | -0.32 | +2.09 |
| Martin ratioReturn relative to average drawdown | 6.51 | -0.48 | +7.00 |
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Drawdowns
MAILX vs. FAOSX - Drawdown Comparison
The maximum MAILX drawdown since its inception was -59.57%, which is greater than FAOSX's maximum drawdown of -36.24%. Use the drawdown chart below to compare losses from any high point for MAILX and FAOSX.
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Drawdown Indicators
| MAILX | FAOSX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -59.57% | -36.24% | -23.33% |
Max Drawdown (1Y)Largest decline over 1 year | -12.34% | -7.26% | -5.08% |
Max Drawdown (3Y)Largest decline over 3 years | -17.36% | -13.96% | -3.40% |
Max Drawdown (5Y)Largest decline over 5 years | -41.68% | -36.24% | -5.44% |
Max Drawdown (10Y)Largest decline over 10 years | -41.68% | — | — |
Current DrawdownCurrent decline from peak | -2.47% | -5.86% | +3.39% |
Average DrawdownAverage peak-to-trough decline | -16.06% | -7.90% | -8.16% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 3.36% | 4.48% | -1.12% |
Volatility
MAILX vs. FAOSX - Volatility Comparison
BlackRock International Fund of BlackRock Series, Inc. (MAILX) has a higher volatility of 5.51% compared to Fidelity Advisor Overseas Fund Class Z (FAOSX) at 0.00%. This indicates that MAILX's price experiences larger fluctuations and is considered to be riskier than FAOSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MAILX | FAOSX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 5.51% | 0.00% | +5.51% |
Volatility (6M)Calculated over the trailing 6-month period | 14.65% | 0.00% | +14.65% |
Volatility (1Y)Calculated over the trailing 1-year period | 16.67% | 7.68% | +8.99% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 18.09% | 16.65% | +1.44% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.17% | 16.56% | +1.61% |
MAILX vs. FAOSX - Expense Ratio Comparison
MAILX has a 0.65% expense ratio, which is lower than FAOSX's 1.02% expense ratio.
Dividends
MAILX vs. FAOSX - Dividend Comparison
MAILX's dividend yield for the trailing twelve months is around 2.29%, less than FAOSX's 8.67% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
FAOSX Fidelity Advisor Overseas Fund Class Z | 8.67% | 8.67% | 1.80% | 1.12% | 0.85% | 2.07% | 0.00% | 1.70% | 5.30% | 3.93% | 0.00% | 0.00% |
MAILX BlackRock International Fund of BlackRock Series, Inc. | 2.29% | 1.79% | 0.90% | 1.08% | 1.13% | 7.30% | 0.33% | 1.11% | 1.83% | 1.39% | 1.62% | 0.65% |
Frequently Asked Questions
MAILX and FAOSX have a correlation of 0.41, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MAILX has higher volatility (5.51%) compared to FAOSX (0.00%). In terms of maximum drawdown, MAILX dropped -59.57% vs FAOSX's -36.24%.
MAILX currently has the higher Sharpe Ratio (1.32 vs -0.30), 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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