FIONX vs. FAOSX

Last updated Jun 25, 2026

FIONX (Fidelity SAI International Index Fund) and FAOSX (Fidelity Advisor Overseas Fund Class Z) are both Foreign Large Cap Equities funds from Fidelity. Over the past 5 years, FIONX returned 8.65%/yr vs 3.48%/yr for FAOSX. Their correlation of 0.91 suggests significant overlap in exposure. FIONX charges 0.04%/yr vs 1.02%/yr for FAOSX.

Performance

FIONX vs. FAOSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity SAI International Index Fund (FIONX) and Fidelity Advisor Overseas Fund Class Z (FAOSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

FIONX

• 1D: -2.07%
• 1M: 0.00%
• YTD: 8.42%
• 6M: 8.11%
• 1Y: 20.56%
• 3Y*: 16.79%
• 5Y*: 8.65%
• 10Y*: —

FAOSX

• 1D: 0.00%
• 1M: 0.00%
• YTD: 0.00%
• 6M: 0.00%
• 1Y: -1.89%
• 3Y*: 9.26%
• 5Y*: 3.48%
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

FIONX vs. FAOSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FIONX Fidelity SAI International Index Fund	8.42%	31.85%	3.64%	18.22%	-14.19%	11.24%	8.17%	22.09%	-13.59%	19.25%
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 FIONX and FAOSX is 0.54, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.54
Correlation (3Y) Calculated over the trailing 3-year period	0.81
Correlation (5Y) Calculated over the trailing 5-year period	0.88
Correlation (All Time) Calculated using the full available price history since Feb 1, 2017	0.91

Over the past year, the correlation between FIONX and FAOSX has dropped to 0.54 - well below their long-term average of 0.91, suggesting their price drivers have been diverging.

Return for Risk

FIONX vs. FAOSX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

FIONX

FIONX Risk / Return Rank: 32
FIONX Sharpe Ratio Rank: 31
FIONX Sortino Ratio Rank: 31
FIONX Omega Ratio Rank: 31
FIONX Calmar Ratio Rank: 32
FIONX Martin Ratio Rank: 36

FAOSX

FAOSX Risk / Return Rank: 3
FAOSX Sharpe Ratio Rank: 3
FAOSX Sortino Ratio Rank: 3
FAOSX Omega Ratio Rank: 3
FAOSX Calmar Ratio Rank: 3
FAOSX Martin Ratio Rank: 3

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

FIONX vs. FAOSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity SAI International Index Fund (FIONX) 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.

	FIONX	FAOSX	Difference
Sharpe ratio: Return per unit of total volatility	1.45	-0.07	+1.52
Sortino ratio: Return per unit of downside risk	2.06	-0.04	+2.11
Omega ratio: Gain probability vs. loss probability	1.26	0.99	+0.27
Calmar ratio: Return relative to maximum drawdown	1.95	-0.09	+2.04
Martin ratio: Return relative to average drawdown	7.28	-0.14	+7.43

FIONX vs. FAOSX - Sharpe Ratio Comparison

The current FIONX Sharpe Ratio is 1.45, which is higher than the FAOSX Sharpe Ratio of -0.07. The chart below compares the historical Sharpe Ratios of FIONX and FAOSX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

FIONX vs. FAOSX - Drawdown Comparison

The maximum FIONX drawdown since its inception was -33.69%, smaller than the maximum FAOSX drawdown of -36.24%. Use the drawdown chart below to compare losses from any high point for FIONX and FAOSX.

Drawdown Indicators

	FIONX	FAOSX	Difference
Max Drawdown Largest peak-to-trough decline	-33.69%	-36.24%	+2.55%
Max Drawdown (1Y) Largest decline over 1 year	-11.40%	-7.26%	-4.14%
Max Drawdown (3Y) Largest decline over 3 years	-13.62%	-13.96%	+0.34%
Max Drawdown (5Y) Largest decline over 5 years	-29.49%	-36.24%	+6.75%
Current Drawdown Current decline from peak	-2.07%	-5.86%	+3.79%
Average Drawdown Average peak-to-trough decline	-6.34%	-7.92%	+1.58%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.04%	4.15%	-1.11%

Volatility

FIONX vs. FAOSX - Volatility Comparison

Fidelity SAI International Index Fund (FIONX) has a higher volatility of 5.29% compared to Fidelity Advisor Overseas Fund Class Z (FAOSX) at 0.00%. This indicates that FIONX'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.

Volatility by Period

	FIONX	FAOSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.29%	0.00%	+5.29%
Volatility (6M) Calculated over the trailing 6-month period	12.88%	3.63%	+9.25%
Volatility (1Y) Calculated over the trailing 1-year period	15.41%	8.75%	+6.66%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.15%	16.71%	-0.56%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.57%	16.64%	-0.07%

FIONX vs. FAOSX - Expense Ratio Comparison

FIONX has a 0.04% expense ratio, which is lower than FAOSX's 1.02% expense ratio.

Dividends

FIONX vs. FAOSX - Dividend Comparison

FIONX's dividend yield for the trailing twelve months is around 3.02%, less than FAOSX's 8.67% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
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%
FIONX Fidelity SAI International Index Fund	3.02%	3.28%	3.06%	2.18%	3.34%	2.65%	1.91%	3.16%	3.00%	0.52%

Frequently Asked Questions

Can I hold both FIONX and FAOSX in my portfolio?

FIONX and FAOSX have a correlation of 0.54, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FIONX or FAOSX?

FIONX has higher volatility (5.29%) compared to FAOSX (0.00%). In terms of maximum drawdown, FIONX dropped -33.69% vs FAOSX's -36.24%.

Which has better risk-adjusted returns?

FIONX currently has the higher Sharpe Ratio (1.45 vs -0.07), 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.