FSOSX vs. FSPSX

Last updated Jun 23, 2026

FSOSX (Fidelity Series Overseas Fund) and FSPSX (Fidelity International Index Fund) are both Foreign Large Cap Equities funds from Fidelity. Over the past 5 years, FSOSX returned 7.49%/yr vs 9.50%/yr for FSPSX. Their correlation of 0.95 suggests significant overlap in exposure. FSOSX charges 0.01%/yr vs 0.04%/yr for FSPSX.

Performance

FSOSX vs. FSPSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Series Overseas Fund (FSOSX) and Fidelity International Index Fund (FSPSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FSOSX achieves a 9.11% return, which is significantly lower than FSPSX's 10.54% return.

FSOSX

• 1D: 1.69%
• 1M: 4.69%
• YTD: 9.11%
• 6M: 9.11%
• 1Y: 14.75%
• 3Y*: 13.42%
• 5Y*: 7.49%
• 10Y*: —

FSPSX

• 1D: 0.76%
• 1M: 1.93%
• YTD: 10.54%
• 6M: 11.05%
• 1Y: 25.44%
• 3Y*: 16.37%
• 5Y*: 9.50%
• 10Y*: 9.67%

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

FSOSX vs. FSPSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
FSOSX Fidelity Series Overseas Fund	9.11%	21.29%	5.87%	21.49%	-23.25%	19.59%	16.36%	7.78%
FSPSX Fidelity International Index Fund	10.54%	31.98%	3.70%	18.31%	-14.23%	11.45%	8.16%	7.37%

Correlation

The correlation between FSOSX and FSPSX is 0.95 - 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	0.95
Correlation (3Y) Calculated over the trailing 3-year period	0.94
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (All Time) Calculated using the full available price history since Jun 28, 2019	0.95

The correlation between FSOSX and FSPSX has been stable across timeframes, ranging from 0.94 to 0.95 - a consistent structural relationship.

Return for Risk

FSOSX vs. FSPSX — Risk / Return Rank

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

FSOSX

FSOSX Risk / Return Rank: 12
FSOSX Sharpe Ratio Rank: 10
FSOSX Sortino Ratio Rank: 11
FSOSX Omega Ratio Rank: 11
FSOSX Calmar Ratio Rank: 13
FSOSX Martin Ratio Rank: 16

FSPSX

FSPSX Risk / Return Rank: 36
FSPSX Sharpe Ratio Rank: 36
FSPSX Sortino Ratio Rank: 35
FSPSX Omega Ratio Rank: 35
FSPSX Calmar Ratio Rank: 36
FSPSX Martin Ratio Rank: 39

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.

FSOSX vs. FSPSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Series Overseas Fund (FSOSX) and Fidelity International Index Fund (FSPSX). 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.

	FSOSX	FSPSX	Difference
Sharpe ratio: Return per unit of total volatility	0.80	1.61	-0.81
Sortino ratio: Return per unit of downside risk	1.24	2.28	-1.04
Omega ratio: Gain probability vs. loss probability	1.15	1.29	-0.14
Calmar ratio: Return relative to maximum drawdown	1.13	2.15	-1.02
Martin ratio: Return relative to average drawdown	4.00	8.05	-4.05

FSOSX vs. FSPSX - Sharpe Ratio Comparison

The current FSOSX Sharpe Ratio is 0.80, which is lower than the FSPSX Sharpe Ratio of 1.61. The chart below compares the historical Sharpe Ratios of FSOSX and FSPSX, 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

FSOSX vs. FSPSX - Drawdown Comparison

The maximum FSOSX drawdown since its inception was -35.36%, roughly equal to the maximum FSPSX drawdown of -33.69%. Use the drawdown chart below to compare losses from any high point for FSOSX and FSPSX.

Drawdown Indicators

	FSOSX	FSPSX	Difference
Max Drawdown Largest peak-to-trough decline	-35.36%	-33.69%	-1.67%
Max Drawdown (1Y) Largest decline over 1 year	-12.39%	-11.39%	-1.00%
Max Drawdown (3Y) Largest decline over 3 years	-14.07%	-13.58%	-0.49%
Max Drawdown (5Y) Largest decline over 5 years	-35.36%	-29.41%	-5.95%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.69%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-7.74%	-6.53%	-1.21%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.49%	3.04%	+0.45%

Volatility

FSOSX vs. FSPSX - Volatility Comparison

Fidelity Series Overseas Fund (FSOSX) has a higher volatility of 6.52% compared to Fidelity International Index Fund (FSPSX) at 4.93%. This indicates that FSOSX's price experiences larger fluctuations and is considered to be riskier than FSPSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FSOSX	FSPSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.52%	4.93%	+1.59%
Volatility (6M) Calculated over the trailing 6-month period	15.35%	12.71%	+2.64%
Volatility (1Y) Calculated over the trailing 1-year period	17.61%	15.26%	+2.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.85%	16.07%	+1.78%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.11%	16.56%	+2.55%

FSOSX vs. FSPSX - Expense Ratio Comparison

FSOSX has a 0.01% expense ratio, which is lower than FSPSX's 0.04% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

FSOSX vs. FSPSX - Dividend Comparison

FSOSX's dividend yield for the trailing twelve months is around 8.39%, more than FSPSX's 2.85% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSOSX Fidelity Series Overseas Fund	8.39%	9.15%	2.25%	1.63%	1.80%	2.92%	1.12%	0.37%	0.00%	0.00%	0.00%	0.00%
FSPSX Fidelity International Index Fund	2.85%	3.15%	3.27%	2.79%	2.66%	3.07%	1.84%	3.18%	2.79%	2.50%	3.08%	2.79%

Frequently Asked Questions

Can I hold both FSOSX and FSPSX in my portfolio?

With a correlation of 0.95, FSOSX and FSPSX 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.

Which is riskier, FSOSX or FSPSX?

FSOSX has higher volatility (6.52%) compared to FSPSX (4.93%). In terms of maximum drawdown, FSOSX dropped -35.36% vs FSPSX's -33.69%.

Which has better risk-adjusted returns?

FSPSX currently has the higher Sharpe Ratio (1.61 vs 0.80), 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.