MGRVX vs. VIEIX

Last updated Jun 16, 2026

MGRVX (MFS International Growth Fund Class R4) and VIEIX (Vanguard Extended Market Index Fund Institutional Shares) are both mutual funds - MGRVX is a Foreign Large Cap Equities fund managed by MFS, while VIEIX is a Mid Cap Blend Equities fund managed by Vanguard. Over the past 10 years, MGRVX returned 10.23%/yr vs 12.34%/yr for VIEIX. A 0.72 correlation means they provide meaningful diversification when combined. MGRVX charges 0.83%/yr vs 0.05%/yr for VIEIX.

Performance

MGRVX vs. VIEIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS International Growth Fund Class R4 (MGRVX) and Vanguard Extended Market Index Fund Institutional Shares (VIEIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MGRVX achieves a 1.85% return, which is significantly lower than VIEIX's 14.43% return. Over the past 10 years, MGRVX has underperformed VIEIX with an annualized return of 10.23%, while VIEIX has yielded a comparatively higher 12.34% annualized return.

MGRVX

• 1D: 0.37%
• 1M: 2.22%
• YTD: 1.85%
• 6M: 1.98%
• 1Y: 8.28%
• 3Y*: 11.09%
• 5Y*: 5.67%
• 10Y*: 10.23%

VIEIX

• 1D: 0.50%
• 1M: 6.16%
• YTD: 14.43%
• 6M: 13.24%
• 1Y: 30.22%
• 3Y*: 18.69%
• 5Y*: 6.18%
• 10Y*: 12.34%

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

MGRVX vs. VIEIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MGRVX MFS International Growth Fund Class R4	1.85%	21.04%	9.10%	14.82%	-15.10%	9.50%	15.70%	27.19%	-8.87%	32.47%
VIEIX Vanguard Extended Market Index Fund Institutional Shares	14.43%	11.42%	15.49%	26.97%	-26.46%	12.46%	32.24%	28.05%	-9.36%	18.12%

Correlation

The correlation between MGRVX and VIEIX is 0.70, 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	0.70
Correlation (3Y) Calculated over the trailing 3-year period	0.68
Correlation (5Y) Calculated over the trailing 5-year period	0.70
Correlation (10Y) Calculated over the trailing 10-year period	0.68
Correlation (All Time) Calculated using the full available price history since Oct 1, 2008	0.72

The correlation between MGRVX and VIEIX has been stable across timeframes, ranging from 0.68 to 0.72 - a consistent structural relationship.

Return for Risk

MGRVX vs. VIEIX — Risk / Return Rank

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

MGRVX

MGRVX Risk / Return Rank: 8
MGRVX Sharpe Ratio Rank: 8
MGRVX Sortino Ratio Rank: 8
MGRVX Omega Ratio Rank: 8
MGRVX Calmar Ratio Rank: 8
MGRVX Martin Ratio Rank: 8

VIEIX

VIEIX Risk / Return Rank: 47
VIEIX Sharpe Ratio Rank: 40
VIEIX Sortino Ratio Rank: 38
VIEIX Omega Ratio Rank: 35
VIEIX Calmar Ratio Rank: 66
VIEIX Martin Ratio Rank: 54

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.

MGRVX vs. VIEIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS International Growth Fund Class R4 (MGRVX) and Vanguard Extended Market Index Fund Institutional Shares (VIEIX). 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.

	MGRVX	VIEIX	Difference
Sharpe ratio: Return per unit of total volatility	0.49	1.58	-1.09
Sortino ratio: Return per unit of downside risk	0.77	2.22	-1.45
Omega ratio: Gain probability vs. loss probability	1.09	1.27	-0.18
Calmar ratio: Return relative to maximum drawdown	0.55	2.74	-2.19
Martin ratio: Return relative to average drawdown	1.79	9.63	-7.84

MGRVX vs. VIEIX - Sharpe Ratio Comparison

The current MGRVX Sharpe Ratio is 0.49, which is lower than the VIEIX Sharpe Ratio of 1.58. The chart below compares the historical Sharpe Ratios of MGRVX and VIEIX, 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

MGRVX vs. VIEIX - Drawdown Comparison

The maximum MGRVX drawdown since its inception was -36.30%, smaller than the maximum VIEIX drawdown of -58.03%. Use the drawdown chart below to compare losses from any high point for MGRVX and VIEIX.

Drawdown Indicators

	MGRVX	VIEIX	Difference
Max Drawdown Largest peak-to-trough decline	-36.30%	-58.03%	+21.73%
Max Drawdown (1Y) Largest decline over 1 year	-12.40%	-10.25%	-2.15%
Max Drawdown (3Y) Largest decline over 3 years	-13.61%	-26.84%	+13.23%
Max Drawdown (5Y) Largest decline over 5 years	-30.56%	-36.32%	+5.76%
Max Drawdown (10Y) Largest decline over 10 years	-30.56%	-41.62%	+11.06%
Current Drawdown Current decline from peak	-4.86%	-0.55%	-4.31%
Average Drawdown Average peak-to-trough decline	-6.65%	-13.82%	+7.17%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.80%	2.92%	+0.88%

Volatility

MGRVX vs. VIEIX - Volatility Comparison

The current volatility for MFS International Growth Fund Class R4 (MGRVX) is 5.50%, while Vanguard Extended Market Index Fund Institutional Shares (VIEIX) has a volatility of 6.48%. This indicates that MGRVX experiences smaller price fluctuations and is considered to be less risky than VIEIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MGRVX	VIEIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.50%	6.48%	-0.98%
Volatility (6M) Calculated over the trailing 6-month period	11.59%	13.30%	-1.71%
Volatility (1Y) Calculated over the trailing 1-year period	13.96%	17.81%	-3.85%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.72%	22.43%	-6.71%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	15.78%	22.40%	-6.62%

MGRVX vs. VIEIX - Expense Ratio Comparison

MGRVX has a 0.83% expense ratio, which is higher than VIEIX's 0.05% expense ratio.

Dividends

MGRVX vs. VIEIX - Dividend Comparison

MGRVX's dividend yield for the trailing twelve months is around 5.40%, more than VIEIX's 1.02% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MGRVX MFS International Growth Fund Class R4	5.40%	5.50%	6.21%	2.73%	2.94%	6.84%	0.72%	1.48%	4.10%	2.53%	1.22%	1.15%
VIEIX Vanguard Extended Market Index Fund Institutional Shares	1.02%	1.14%	1.10%	1.26%	1.16%	1.14%	1.08%	1.31%	1.67%	1.27%	1.45%	1.37%

Frequently Asked Questions

Can I hold both MGRVX and VIEIX in my portfolio?

MGRVX and VIEIX have a correlation of 0.70, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MGRVX or VIEIX?

VIEIX has higher volatility (6.48%) compared to MGRVX (5.50%). In terms of maximum drawdown, MGRVX dropped -36.30% vs VIEIX's -58.03%.

Which has better risk-adjusted returns?

VIEIX currently has the higher Sharpe Ratio (1.58 vs 0.49), 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.