MEIKX vs. VIIIX

Last updated Jun 23, 2026

MEIKX (MFS Value Fund) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - MEIKX is a Large Cap Value Equities fund managed by MFS, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, MEIKX returned 10.33%/yr vs 15.65%/yr for VIIIX. Their correlation of 0.91 suggests significant overlap in exposure. MEIKX charges 0.43%/yr vs 0.02%/yr for VIIIX.

Performance

MEIKX vs. VIIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Value Fund (MEIKX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MEIKX achieves a 6.53% return, which is significantly lower than VIIIX's 10.19% return. Over the past 10 years, MEIKX has underperformed VIIIX with an annualized return of 10.33%, while VIIIX has yielded a comparatively higher 15.65% annualized return.

MEIKX

• 1D: -0.26%
• 1M: 1.32%
• YTD: 6.53%
• 6M: 5.81%
• 1Y: 16.11%
• 3Y*: 13.04%
• 5Y*: 9.14%
• 10Y*: 10.33%

VIIIX

• 1D: 1.09%
• 1M: 0.47%
• YTD: 10.19%
• 6M: 9.68%
• 1Y: 27.18%
• 3Y*: 21.39%
• 5Y*: 14.24%
• 10Y*: 15.65%

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

MEIKX vs. VIIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MEIKX MFS Value Fund	6.53%	13.37%	11.98%	8.32%	-5.92%	25.59%	4.09%	30.18%	-9.81%	17.26%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	10.19%	17.87%	26.29%	25.79%	-18.14%	28.69%	18.41%	31.48%	-4.41%	21.82%

Correlation

The correlation between MEIKX and VIIIX is 0.57, 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	0.57
Correlation (3Y) Calculated over the trailing 3-year period	0.66
Correlation (5Y) Calculated over the trailing 5-year period	0.78
Correlation (10Y) Calculated over the trailing 10-year period	0.83
Correlation (All Time) Calculated using the full available price history since Apr 28, 2006	0.91

Over the past year, the correlation between MEIKX and VIIIX has dropped to 0.57 - well below their long-term average of 0.91, suggesting their price drivers have been diverging.

Return for Risk

MEIKX vs. VIIIX — Risk / Return Rank

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

MEIKX

MEIKX Risk / Return Rank: 36
MEIKX Sharpe Ratio Rank: 33
MEIKX Sortino Ratio Rank: 33
MEIKX Omega Ratio Rank: 30
MEIKX Calmar Ratio Rank: 44
MEIKX Martin Ratio Rank: 41

VIIIX

VIIIX Risk / Return Rank: 66
VIIIX Sharpe Ratio Rank: 64
VIIIX Sortino Ratio Rank: 59
VIIIX Omega Ratio Rank: 61
VIIIX Calmar Ratio Rank: 68
VIIIX Martin Ratio Rank: 79

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.

MEIKX vs. VIIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Value Fund (MEIKX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). 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.

	MEIKX	VIIIX	Difference
Sharpe ratio: Return per unit of total volatility	1.53	2.17	-0.64
Sortino ratio: Return per unit of downside risk	2.22	2.93	-0.71
Omega ratio: Gain probability vs. loss probability	1.27	1.39	-0.13
Calmar ratio: Return relative to maximum drawdown	2.40	3.04	-0.64
Martin ratio: Return relative to average drawdown	8.31	13.74	-5.43

MEIKX vs. VIIIX - Sharpe Ratio Comparison

The current MEIKX Sharpe Ratio is 1.53, which is comparable to the VIIIX Sharpe Ratio of 2.17. The chart below compares the historical Sharpe Ratios of MEIKX and VIIIX, 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

MEIKX vs. VIIIX - Drawdown Comparison

The maximum MEIKX drawdown since its inception was -56.81%, roughly equal to the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for MEIKX and VIIIX.

Drawdown Indicators

	MEIKX	VIIIX	Difference
Max Drawdown Largest peak-to-trough decline	-56.81%	-55.18%	-1.63%
Max Drawdown (1Y) Largest decline over 1 year	-6.76%	-8.90%	+2.14%
Max Drawdown (3Y) Largest decline over 3 years	-13.15%	-18.75%	+5.60%
Max Drawdown (5Y) Largest decline over 5 years	-17.50%	-24.50%	+7.00%
Max Drawdown (10Y) Largest decline over 10 years	-36.68%	-33.79%	-2.89%
Current Drawdown Current decline from peak	-1.44%	-1.36%	-0.08%
Average Drawdown Average peak-to-trough decline	-9.43%	-10.00%	+0.57%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.95%	1.96%	-0.01%

Volatility

MEIKX vs. VIIIX - Volatility Comparison

The current volatility for MFS Value Fund (MEIKX) is 3.22%, while Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) has a volatility of 4.77%. This indicates that MEIKX experiences smaller price fluctuations and is considered to be less risky than VIIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MEIKX	VIIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.22%	4.77%	-1.55%
Volatility (6M) Calculated over the trailing 6-month period	7.88%	9.91%	-2.03%
Volatility (1Y) Calculated over the trailing 1-year period	10.64%	12.47%	-1.83%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	13.93%	16.99%	-3.06%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.56%	18.10%	-1.54%

MEIKX vs. VIIIX - Expense Ratio Comparison

MEIKX has a 0.43% expense ratio, which is higher than VIIIX's 0.02% expense ratio.

Dividends

MEIKX vs. VIIIX - Dividend Comparison

MEIKX's dividend yield for the trailing twelve months is around 9.32%, more than VIIIX's 2.44% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MEIKX MFS Value Fund	9.32%	9.72%	9.49%	8.58%	7.77%	3.43%	2.75%	3.28%	3.76%	4.14%	3.84%	6.12%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	2.44%	2.11%	3.66%	2.66%	3.39%	4.79%	3.07%	2.86%	2.45%	1.84%	2.38%	2.47%

Frequently Asked Questions

Can I hold both MEIKX and VIIIX in my portfolio?

MEIKX and VIIIX have a correlation of 0.57, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MEIKX or VIIIX?

VIIIX has higher volatility (4.77%) compared to MEIKX (3.22%). In terms of maximum drawdown, MEIKX dropped -56.81% vs VIIIX's -55.18%.

Which has better risk-adjusted returns?

VIIIX currently has the higher Sharpe Ratio (2.17 vs 1.53), 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.