VDIPX vs. FSOSX

Last updated Jun 25, 2026

VDIPX (Vanguard Developed Markets Index Fund Institutional Plus Shares) and FSOSX (Fidelity Series Overseas Fund) are both Foreign Large Cap Equities funds. Over the past 5 years, VDIPX returned 9.49%/yr vs 6.46%/yr for FSOSX. Their correlation of 0.93 suggests significant overlap in exposure. VDIPX charges 0.04%/yr vs 0.01%/yr for FSOSX.

Performance

VDIPX vs. FSOSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Developed Markets Index Fund Institutional Plus Shares (VDIPX) and Fidelity Series Overseas Fund (FSOSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VDIPX achieves a 12.98% return, which is significantly higher than FSOSX's 6.16% return.

VDIPX

• 1D: -3.08%
• 1M: -0.09%
• YTD: 12.98%
• 6M: 12.73%
• 1Y: 28.55%
• 3Y*: 19.40%
• 5Y*: 9.49%
• 10Y*: 10.68%

FSOSX

• 1D: -3.29%
• 1M: 1.86%
• YTD: 6.16%
• 6M: 5.74%
• 1Y: 9.18%
• 3Y*: 13.69%
• 5Y*: 6.46%
• 10Y*: —

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

VDIPX vs. FSOSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
VDIPX Vanguard Developed Markets Index Fund Institutional Plus Shares	12.98%	35.15%	3.08%	17.78%	-15.35%	11.45%	10.26%	7.82%
FSOSX Fidelity Series Overseas Fund	6.16%	21.29%	5.87%	21.49%	-23.25%	19.59%	16.36%	7.78%

Correlation

The correlation between VDIPX and FSOSX is 0.91, 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	0.91
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jun 28, 2019	0.93

The correlation between VDIPX and FSOSX has been stable across timeframes, ranging from 0.91 to 0.93 - a consistent structural relationship.

Return for Risk

VDIPX vs. FSOSX — Risk / Return Rank

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

VDIPX

VDIPX Risk / Return Rank: 48
VDIPX Sharpe Ratio Rank: 48
VDIPX Sortino Ratio Rank: 43
VDIPX Omega Ratio Rank: 48
VDIPX Calmar Ratio Rank: 52
VDIPX Martin Ratio Rank: 52

FSOSX

FSOSX Risk / Return Rank: 9
FSOSX Sharpe Ratio Rank: 8
FSOSX Sortino Ratio Rank: 8
FSOSX Omega Ratio Rank: 8
FSOSX Calmar Ratio Rank: 10
FSOSX Martin Ratio Rank: 12

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.

VDIPX vs. FSOSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Developed Markets Index Fund Institutional Plus Shares (VDIPX) and Fidelity Series Overseas Fund (FSOSX). 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.

	VDIPX	FSOSX	Difference
Sharpe ratio: Return per unit of total volatility	1.87	0.60	+1.27
Sortino ratio: Return per unit of downside risk	2.52	0.97	+1.56
Omega ratio: Gain probability vs. loss probability	1.34	1.12	+0.22
Calmar ratio: Return relative to maximum drawdown	2.60	0.87	+1.73
Martin ratio: Return relative to average drawdown	9.96	3.07	+6.89

VDIPX vs. FSOSX - Sharpe Ratio Comparison

The current VDIPX Sharpe Ratio is 1.87, which is higher than the FSOSX Sharpe Ratio of 0.60. The chart below compares the historical Sharpe Ratios of VDIPX and FSOSX, 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

VDIPX vs. FSOSX - Drawdown Comparison

The maximum VDIPX drawdown since its inception was -35.61%, roughly equal to the maximum FSOSX drawdown of -35.36%. Use the drawdown chart below to compare losses from any high point for VDIPX and FSOSX.

Drawdown Indicators

	VDIPX	FSOSX	Difference
Max Drawdown Largest peak-to-trough decline	-35.61%	-35.36%	-0.25%
Max Drawdown (1Y) Largest decline over 1 year	-11.67%	-12.39%	+0.72%
Max Drawdown (3Y) Largest decline over 3 years	-13.15%	-14.07%	+0.92%
Max Drawdown (5Y) Largest decline over 5 years	-29.69%	-35.36%	+5.67%
Max Drawdown (10Y) Largest decline over 10 years	-35.61%	—	—
Current Drawdown Current decline from peak	-3.08%	-3.29%	+0.21%
Average Drawdown Average peak-to-trough decline	-7.17%	-7.73%	+0.56%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.04%	3.50%	-0.46%

Volatility

VDIPX vs. FSOSX - Volatility Comparison

Vanguard Developed Markets Index Fund Institutional Plus Shares (VDIPX) and Fidelity Series Overseas Fund (FSOSX) have volatilities of 6.97% and 7.26%, 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.

Volatility by Period

	VDIPX	FSOSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.97%	7.26%	-0.29%
Volatility (6M) Calculated over the trailing 6-month period	14.01%	15.67%	-1.66%
Volatility (1Y) Calculated over the trailing 1-year period	16.26%	17.92%	-1.66%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.11%	17.91%	-1.80%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.39%	19.14%	-2.75%

VDIPX vs. FSOSX - Expense Ratio Comparison

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

Dividends

VDIPX vs. FSOSX - Dividend Comparison

VDIPX's dividend yield for the trailing twelve months is around 2.60%, less than FSOSX's 8.62% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSOSX Fidelity Series Overseas Fund	8.62%	9.15%	2.25%	1.63%	1.80%	2.92%	1.12%	0.37%	0.00%	0.00%	0.00%	0.00%
VDIPX Vanguard Developed Markets Index Fund Institutional Plus Shares	2.60%	3.23%	3.37%	3.16%	2.92%	3.17%	2.05%	3.05%	3.36%	2.79%	3.08%	2.95%

Frequently Asked Questions

Can I hold both VDIPX and FSOSX in my portfolio?

With a correlation of 0.91, VDIPX and FSOSX 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, VDIPX or FSOSX?

FSOSX has higher volatility (7.26%) compared to VDIPX (6.97%). In terms of maximum drawdown, VDIPX dropped -35.61% vs FSOSX's -35.36%.

Which has better risk-adjusted returns?

VDIPX currently has the higher Sharpe Ratio (1.87 vs 0.60), 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.