RYUIX vs. MMUFX

Last updated Jun 3, 2026

RYUIX (Rydex Utilities Fund) and MMUFX (MFS Utilities Fund) are both Utilities Equities funds. Over the past 10 years, RYUIX returned 7.58%/yr vs 8.19%/yr for MMUFX. Their correlation of 0.86 suggests significant overlap in exposure. RYUIX charges 1.39%/yr vs 0.99%/yr for MMUFX.

Performance

RYUIX vs. MMUFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Rydex Utilities Fund (RYUIX) and MFS Utilities Fund (MMUFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RYUIX achieves a 2.61% return, which is significantly lower than MMUFX's 3.00% return. Over the past 10 years, RYUIX has underperformed MMUFX with an annualized return of 7.58%, while MMUFX has yielded a comparatively higher 8.19% annualized return.

RYUIX

• 1D: -2.63%
• 1M: -5.75%
• YTD: 2.61%
• 6M: 0.57%
• 1Y: 9.40%
• 3Y*: 13.07%
• 5Y*: 8.59%
• 10Y*: 7.58%

MMUFX

• 1D: -2.79%
• 1M: -7.29%
• YTD: 3.00%
• 6M: 1.34%
• 1Y: 10.65%
• 3Y*: 9.61%
• 5Y*: 7.08%
• 10Y*: 8.19%

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

RYUIX vs. MMUFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RYUIX Rydex Utilities Fund	2.61%	17.90%	20.25%	-6.78%	1.32%	15.08%	-4.56%	19.38%	4.07%	11.36%
MMUFX MFS Utilities Fund	3.00%	14.32%	11.38%	-2.28%	0.35%	13.86%	6.04%	24.91%	0.85%	14.69%

Correlation

The correlation between RYUIX and MMUFX is 0.96 - 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	0.96
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (10Y) Calculated over the trailing 10-year period	0.90
Correlation (All Time) Calculated using the full available price history since Jan 3, 2001	0.86

The correlation between RYUIX and MMUFX shifts across timeframes, from 0.86 (all time) to 0.96 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

RYUIX vs. MMUFX — Risk / Return Rank

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

RYUIX

RYUIX Risk / Return Rank: 10
RYUIX Sharpe Ratio Rank: 9
RYUIX Sortino Ratio Rank: 8
RYUIX Omega Ratio Rank: 8
RYUIX Calmar Ratio Rank: 14
RYUIX Martin Ratio Rank: 9

MMUFX

MMUFX Risk / Return Rank: 11
MMUFX Sharpe Ratio Rank: 9
MMUFX Sortino Ratio Rank: 9
MMUFX Omega Ratio Rank: 9
MMUFX Calmar Ratio Rank: 14
MMUFX 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.

RYUIX vs. MMUFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Rydex Utilities Fund (RYUIX) and MFS Utilities Fund (MMUFX). 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.

	RYUIX	MMUFX	Difference
Sharpe ratio Return per unit of total volatility	0.71	0.78	-0.07
Sortino ratio Return per unit of downside risk	1.03	1.14	-0.11
Omega ratio Gain probability vs. loss probability	1.13	1.14	-0.02
Calmar ratio Return relative to maximum drawdown	1.32	1.36	-0.04
Martin ratio Return relative to average drawdown	2.92	3.68	-0.76
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

RYUIX vs. MMUFX - Sharpe Ratio Comparison

The current RYUIX Sharpe Ratio is 0.71, which is comparable to the MMUFX Sharpe Ratio of 0.78. The chart below compares the historical Sharpe Ratios of RYUIX and MMUFX, 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

	RYUIX	MMUFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.71	0.78	-0.07
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.52	0.45	+0.07
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.40	0.49	-0.09
Sharpe Ratio (All Time) Calculated using the full available price history	0.27	0.63	-0.36

Drawdowns

RYUIX vs. MMUFX - Drawdown Comparison

The maximum RYUIX drawdown since its inception was -63.29%, which is greater than MMUFX's maximum drawdown of -56.03%. Use the drawdown chart below to compare losses from any high point for RYUIX and MMUFX.

Drawdown Indicators

	RYUIX	MMUFX	Difference
Max Drawdown Largest peak-to-trough decline	-63.29%	-56.03%	-7.26%
Max Drawdown (1Y) Largest decline over 1 year	-7.97%	-8.75%	+0.78%
Max Drawdown (3Y) Largest decline over 3 years	-17.03%	-17.72%	+0.69%
Max Drawdown (5Y) Largest decline over 5 years	-24.28%	-21.64%	-2.64%
Max Drawdown (10Y) Largest decline over 10 years	-36.88%	-35.82%	-1.06%
Current Drawdown Current decline from peak	-7.68%	-8.75%	+1.07%
Average Drawdown Average peak-to-trough decline	-14.46%	-8.75%	-5.71%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.59%	3.24%	+0.35%

Volatility

RYUIX vs. MMUFX - Volatility Comparison

The current volatility for Rydex Utilities Fund (RYUIX) is 4.72%, while MFS Utilities Fund (MMUFX) has a volatility of 5.04%. This indicates that RYUIX experiences smaller price fluctuations and is considered to be less risky than MMUFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RYUIX	MMUFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.72%	5.04%	-0.32%
Volatility (6M) Calculated over the trailing 6-month period	10.89%	11.51%	-0.62%
Volatility (1Y) Calculated over the trailing 1-year period	13.61%	14.19%	-0.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.65%	15.79%	+0.86%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.93%	16.64%	+2.29%

RYUIX vs. MMUFX - Expense Ratio Comparison

RYUIX has a 1.39% expense ratio, which is higher than MMUFX's 0.99% expense ratio.

Dividends

RYUIX vs. MMUFX - Dividend Comparison

RYUIX's dividend yield for the trailing twelve months is around 1.82%, less than MMUFX's 3.71% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MMUFX MFS Utilities Fund	3.71%	3.83%	3.72%	5.82%	8.68%	5.61%	5.80%	6.85%	4.29%	2.67%	3.72%	9.09%
RYUIX Rydex Utilities Fund	1.82%	1.87%	0.67%	3.16%	0.81%	2.61%	2.17%	0.91%	0.00%	2.61%	10.04%	1.62%

Frequently Asked Questions

Can I hold both RYUIX and MMUFX in my portfolio?

With a correlation of 0.96, RYUIX and MMUFX 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, RYUIX or MMUFX?

MMUFX has higher volatility (5.04%) compared to RYUIX (4.72%). In terms of maximum drawdown, RYUIX dropped -63.29% vs MMUFX's -56.03%.

Which has better risk-adjusted returns?

MMUFX currently has the higher Sharpe Ratio (0.78 vs 0.71), 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.