MVCKX vs. FIUSX

Last updated Jun 3, 2026

MVCKX (MFS Mid Cap Value Fund Class R6) and FIUSX (Delaware Opportunity Fund) are both Mid Cap Value Equities funds. Over the past 10 years, MVCKX returned 9.30%/yr vs 10.89%/yr for FIUSX. With a 0.96 correlation, they move nearly in lockstep. MVCKX charges 0.62%/yr vs 1.15%/yr for FIUSX.

Performance

MVCKX vs. FIUSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Mid Cap Value Fund Class R6 (MVCKX) and Delaware Opportunity Fund (FIUSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MVCKX achieves a 7.87% return, which is significantly lower than FIUSX's 16.97% return. Over the past 10 years, MVCKX has underperformed FIUSX with an annualized return of 9.30%, while FIUSX has yielded a comparatively higher 10.89% annualized return.

MVCKX

• 1D: -0.21%
• 1M: 1.32%
• YTD: 7.87%
• 6M: 8.99%
• 1Y: 17.55%
• 3Y*: 11.09%
• 5Y*: 6.39%
• 10Y*: 9.30%

FIUSX

• 1D: -0.18%
• 1M: 0.39%
• YTD: 16.97%
• 6M: 17.39%
• 1Y: 33.44%
• 3Y*: 19.44%
• 5Y*: 10.29%
• 10Y*: 10.89%

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

MVCKX vs. FIUSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MVCKX MFS Mid Cap Value Fund Class R6	7.87%	6.47%	6.80%	12.92%	-8.62%	30.93%	4.40%	31.11%	-11.35%	13.83%
FIUSX Delaware Opportunity Fund	16.97%	12.60%	14.07%	11.68%	-9.62%	30.95%	0.88%	29.58%	-15.71%	18.67%

Correlation

The correlation between MVCKX and FIUSX is 0.94, 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	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.97
Correlation (10Y) Calculated over the trailing 10-year period	0.97
Correlation (All Time) Calculated using the full available price history since Jan 3, 2014	0.96

The correlation between MVCKX and FIUSX has been stable across timeframes, ranging from 0.94 to 0.97 - a consistent structural relationship.

Return for Risk

MVCKX vs. FIUSX — Risk / Return Rank

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

MVCKX

MVCKX Risk / Return Rank: 21
MVCKX Sharpe Ratio Rank: 20
MVCKX Sortino Ratio Rank: 20
MVCKX Omega Ratio Rank: 18
MVCKX Calmar Ratio Rank: 23
MVCKX Martin Ratio Rank: 25

FIUSX

FIUSX Risk / Return Rank: 77
FIUSX Sharpe Ratio Rank: 71
FIUSX Sortino Ratio Rank: 71
FIUSX Omega Ratio Rank: 61
FIUSX Calmar Ratio Rank: 92
FIUSX Martin Ratio Rank: 91

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.

MVCKX vs. FIUSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Mid Cap Value Fund Class R6 (MVCKX) and Delaware Opportunity Fund (FIUSX). 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.

	MVCKX	FIUSX	Difference
Sharpe ratio Return per unit of total volatility	1.29	2.45	-1.16
Sortino ratio Return per unit of downside risk	1.94	3.52	-1.58
Omega ratio Gain probability vs. loss probability	1.23	1.44	-0.21
Calmar ratio Return relative to maximum drawdown	1.82	4.99	-3.17
Martin ratio Return relative to average drawdown	6.24	18.68	-12.44
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MVCKX vs. FIUSX - Sharpe Ratio Comparison

The current MVCKX Sharpe Ratio is 1.29, which is lower than the FIUSX Sharpe Ratio of 2.45. The chart below compares the historical Sharpe Ratios of MVCKX and FIUSX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	MVCKX	FIUSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.29	2.45	-1.16
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.37	0.57	-0.20
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.48	0.53	-0.05
Sharpe Ratio (All Time) Calculated using the full available price history	0.48	0.45	+0.03

Drawdowns

MVCKX vs. FIUSX - Drawdown Comparison

The maximum MVCKX drawdown since its inception was -42.75%, smaller than the maximum FIUSX drawdown of -56.30%. Use the drawdown chart below to compare losses from any high point for MVCKX and FIUSX.

Drawdown Indicators

	MVCKX	FIUSX	Difference
Max Drawdown Largest peak-to-trough decline	-42.75%	-56.30%	+13.55%
Max Drawdown (1Y) Largest decline over 1 year	-9.36%	-6.75%	-2.61%
Max Drawdown (3Y) Largest decline over 3 years	-25.96%	-21.69%	-4.27%
Max Drawdown (5Y) Largest decline over 5 years	-25.96%	-21.69%	-4.27%
Max Drawdown (10Y) Largest decline over 10 years	-42.75%	-46.38%	+3.63%
Current Drawdown Current decline from peak	-1.11%	-1.39%	+0.28%
Average Drawdown Average peak-to-trough decline	-5.27%	-9.46%	+4.19%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.72%	1.80%	+0.92%

Volatility

MVCKX vs. FIUSX - Volatility Comparison

The current volatility for MFS Mid Cap Value Fund Class R6 (MVCKX) is 3.45%, while Delaware Opportunity Fund (FIUSX) has a volatility of 3.98%. This indicates that MVCKX experiences smaller price fluctuations and is considered to be less risky than FIUSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MVCKX	FIUSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.45%	3.98%	-0.53%
Volatility (6M) Calculated over the trailing 6-month period	9.68%	10.37%	-0.69%
Volatility (1Y) Calculated over the trailing 1-year period	13.41%	13.77%	-0.36%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.53%	18.16%	-0.63%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.40%	20.57%	-1.17%

MVCKX vs. FIUSX - Expense Ratio Comparison

MVCKX has a 0.62% expense ratio, which is lower than FIUSX's 1.15% expense ratio.

Dividends

MVCKX vs. FIUSX - Dividend Comparison

MVCKX's dividend yield for the trailing twelve months is around 7.67%, less than FIUSX's 9.86% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FIUSX Delaware Opportunity Fund	9.86%	11.53%	12.68%	2.85%	8.96%	5.62%	1.60%	40.65%	12.11%	6.00%	4.23%	1.14%
MVCKX MFS Mid Cap Value Fund Class R6	7.67%	8.27%	3.87%	3.00%	5.44%	5.88%	1.12%	2.32%	6.65%	3.68%	0.06%	4.87%

Frequently Asked Questions

Can I hold both MVCKX and FIUSX in my portfolio?

With a correlation of 0.94, MVCKX and FIUSX 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, MVCKX or FIUSX?

FIUSX has higher volatility (3.98%) compared to MVCKX (3.45%). In terms of maximum drawdown, MVCKX dropped -42.75% vs FIUSX's -56.30%.

Which has better risk-adjusted returns?

FIUSX currently has the higher Sharpe Ratio (2.45 vs 1.29), 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.