RYURX vs. SOPIX

Last updated Jun 5, 2026

RYURX (Rydex Inverse S&P 500 Strategy Fund) and SOPIX (ProFunds Short NASDAQ-100 Fund) are both Inverse Equities funds. Over the past 10 years, RYURX returned -25.94%/yr vs -20.72%/yr for SOPIX. Their correlation of 0.89 suggests significant overlap in exposure. RYURX charges 1.49%/yr vs 1.78%/yr for SOPIX.

Performance

RYURX vs. SOPIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Rydex Inverse S&P 500 Strategy Fund (RYURX) and ProFunds Short NASDAQ-100 Fund (SOPIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RYURX achieves a -8.03% return, which is significantly higher than SOPIX's -16.73% return. Over the past 10 years, RYURX has underperformed SOPIX with an annualized return of -25.94%, while SOPIX has yielded a comparatively higher -20.72% annualized return.

RYURX

• 1D: 0.75%
• 1M: -3.61%
• YTD: -8.03%
• 6M: -7.48%
• 1Y: -17.29%
• 3Y*: -49.02%
• 5Y*: -34.17%
• 10Y*: -25.94%

SOPIX

• 1D: 0.28%
• 1M: -8.20%
• YTD: -16.73%
• 6M: -15.37%
• 1Y: -26.64%
• 3Y*: -21.85%
• 5Y*: -16.67%
• 10Y*: -20.72%

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

RYURX vs. SOPIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RYURX Rydex Inverse S&P 500 Strategy Fund	-8.03%	-82.28%	-13.04%	-14.56%	17.56%	-24.19%	-24.90%	-22.65%	4.33%	-17.38%
SOPIX ProFunds Short NASDAQ-100 Fund	-16.73%	-15.80%	-23.82%	-31.85%	34.73%	-25.69%	-42.92%	-28.29%	-3.07%	-25.24%

Correlation

The correlation between RYURX and SOPIX 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	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.90
Correlation (All Time) Calculated using the full available price history since Jan 3, 2003	0.89

The correlation between RYURX and SOPIX has been stable across timeframes, ranging from 0.89 to 0.94 - a consistent structural relationship.

Return for Risk

RYURX vs. SOPIX — Risk / Return Rank

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

RYURX

RYURX Risk / Return Rank: 0
RYURX Sharpe Ratio Rank: 0
RYURX Sortino Ratio Rank: 0
RYURX Omega Ratio Rank: 0
RYURX Calmar Ratio Rank: 0
RYURX Martin Ratio Rank: 0

SOPIX

SOPIX Risk / Return Rank: 0
SOPIX Sharpe Ratio Rank: 0
SOPIX Sortino Ratio Rank: 0
SOPIX Omega Ratio Rank: 0
SOPIX Calmar Ratio Rank: 0
SOPIX Martin Ratio Rank: 0

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.

RYURX vs. SOPIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Rydex Inverse S&P 500 Strategy Fund (RYURX) and ProFunds Short NASDAQ-100 Fund (SOPIX). 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.

	RYURX	SOPIX	Difference
Sharpe ratio: Return per unit of total volatility	-1.47	-1.68	+0.22
Sortino ratio: Return per unit of downside risk	-2.11	-2.51	+0.41
Omega ratio: Gain probability vs. loss probability	0.77	0.74	+0.04
Calmar ratio: Return relative to maximum drawdown	-0.95	-0.98	+0.04
Martin ratio: Return relative to average drawdown	-1.75	-2.11	+0.36
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

RYURX vs. SOPIX - Sharpe Ratio Comparison

The current RYURX Sharpe Ratio is -1.47, which is comparable to the SOPIX Sharpe Ratio of -1.68. The chart below compares the historical Sharpe Ratios of RYURX and SOPIX, 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

	RYURX	SOPIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-1.47	-1.68	+0.22
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.87	-0.72	-0.15
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.84	-0.92	+0.09
Sharpe Ratio (All Time) Calculated using the full available price history	-0.62	-0.81	+0.19

Drawdowns

RYURX vs. SOPIX - Drawdown Comparison

The maximum RYURX drawdown since its inception was -99.34%, roughly equal to the maximum SOPIX drawdown of -99.07%. Use the drawdown chart below to compare losses from any high point for RYURX and SOPIX.

Drawdown Indicators

	RYURX	SOPIX	Difference
Max Drawdown Largest peak-to-trough decline	-99.34%	-99.07%	-0.27%
Max Drawdown (1Y) Largest decline over 1 year	-18.35%	-27.45%	+9.10%
Max Drawdown (3Y) Largest decline over 3 years	-87.70%	-54.87%	-32.83%
Max Drawdown (5Y) Largest decline over 5 years	-88.82%	-65.00%	-23.82%
Max Drawdown (10Y) Largest decline over 10 years	-95.29%	-90.86%	-4.43%
Current Drawdown Current decline from peak	-99.34%	-99.07%	-0.27%
Average Drawdown Average peak-to-trough decline	-69.04%	-76.14%	+7.10%
Ulcer Index Depth and duration of drawdowns from previous peaks	9.91%	12.74%	-2.83%

Volatility

RYURX vs. SOPIX - Volatility Comparison

The current volatility for Rydex Inverse S&P 500 Strategy Fund (RYURX) is 2.89%, while ProFunds Short NASDAQ-100 Fund (SOPIX) has a volatility of 4.53%. This indicates that RYURX experiences smaller price fluctuations and is considered to be less risky than SOPIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RYURX	SOPIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.89%	4.53%	-1.64%
Volatility (6M) Calculated over the trailing 6-month period	8.95%	12.16%	-3.21%
Volatility (1Y) Calculated over the trailing 1-year period	11.82%	16.01%	-4.19%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	39.62%	23.38%	+16.24%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	31.10%	22.49%	+8.61%

RYURX vs. SOPIX - Expense Ratio Comparison

RYURX has a 1.49% expense ratio, which is lower than SOPIX's 1.78% expense ratio.

Dividends

RYURX vs. SOPIX - Dividend Comparison

RYURX's dividend yield for the trailing twelve months is around 4.15%, more than SOPIX's 2.57% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
RYURX Rydex Inverse S&P 500 Strategy Fund	4.15%	3.82%	6.78%	2.79%	0.00%	0.00%	0.42%	0.86%
SOPIX ProFunds Short NASDAQ-100 Fund	2.57%	2.14%	0.00%	6.71%	0.00%	0.00%	0.00%	0.29%

Frequently Asked Questions

Can I hold both RYURX and SOPIX in my portfolio?

With a correlation of 0.94, RYURX and SOPIX 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, RYURX or SOPIX?

SOPIX has higher volatility (4.53%) compared to RYURX (2.89%). In terms of maximum drawdown, RYURX dropped -99.34% vs SOPIX's -99.07%.

Which has better risk-adjusted returns?

RYURX currently has the higher Sharpe Ratio (-1.47 vs -1.68), 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.