SOPIX vs. URPIX

Last updated Jun 3, 2026

SOPIX (ProFunds Short NASDAQ-100 Fund) and URPIX (ProFunds UltraBear Fund) are both Inverse Equities funds from ProFunds. Over the past 10 years, SOPIX returned -20.70%/yr vs -28.82%/yr for URPIX. Their correlation of 0.89 suggests significant overlap in exposure. Both charge a 1.78% expense ratio.

Performance

SOPIX vs. URPIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in ProFunds Short NASDAQ-100 Fund (SOPIX) and ProFunds UltraBear Fund (URPIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SOPIX achieves a -16.58% return, which is significantly higher than URPIX's -18.08% return. Over the past 10 years, SOPIX has outperformed URPIX with an annualized return of -20.70%, while URPIX has yielded a comparatively lower -28.82% annualized return.

SOPIX

• 1D: -0.56%
• 1M: -8.98%
• YTD: -16.58%
• 6M: -15.30%
• 1Y: -27.28%
• 3Y*: -21.80%
• 5Y*: -16.77%
• 10Y*: -20.70%

URPIX

• 1D: -0.34%
• 1M: -9.24%
• YTD: -18.08%
• 6M: -17.97%
• 1Y: -36.41%
• 3Y*: -30.38%
• 5Y*: -23.45%
• 10Y*: -28.82%

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

SOPIX vs. URPIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SOPIX ProFunds Short NASDAQ-100 Fund	-16.58%	-15.80%	-23.82%	-31.85%	34.73%	-25.69%	-42.92%	-28.29%	-3.07%	-25.24%
URPIX ProFunds UltraBear Fund	-18.08%	-27.06%	-32.89%	-31.77%	29.74%	-43.61%	-51.10%	-42.03%	4.20%	-32.58%

Correlation

The correlation between SOPIX and URPIX 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	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.91
Correlation (All Time) Calculated using the full available price history since Jan 3, 2003	0.89

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

Return for Risk

SOPIX vs. URPIX — Risk / Return Rank

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

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

URPIX

URPIX Risk / Return Rank: 0
URPIX Sharpe Ratio Rank: 0
URPIX Sortino Ratio Rank: 0
URPIX Omega Ratio Rank: 0
URPIX Calmar Ratio Rank: 0
URPIX 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.

SOPIX vs. URPIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for ProFunds Short NASDAQ-100 Fund (SOPIX) and ProFunds UltraBear Fund (URPIX). 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.

	SOPIX	URPIX	Difference
Sharpe ratio Return per unit of total volatility	-1.74	-1.56	-0.18
Sortino ratio Return per unit of downside risk	-2.61	-2.45	-0.16
Omega ratio Gain probability vs. loss probability	0.73	0.74	-0.01
Calmar ratio Return relative to maximum drawdown	-1.00	-1.00	0.00
Martin ratio Return relative to average drawdown	-2.10	-1.75	-0.35
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SOPIX vs. URPIX - Sharpe Ratio Comparison

The current SOPIX Sharpe Ratio is -1.74, which is comparable to the URPIX Sharpe Ratio of -1.56. The chart below compares the historical Sharpe Ratios of SOPIX and URPIX, 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

	SOPIX	URPIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-1.74	-1.56	-0.18
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.72	-0.70	-0.02
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.92	-0.81	-0.11
Sharpe Ratio (All Time) Calculated using the full available price history	-0.81	-0.56	-0.25

Drawdowns

SOPIX vs. URPIX - Drawdown Comparison

The maximum SOPIX drawdown since its inception was -99.06%, roughly equal to the maximum URPIX drawdown of -99.92%. Use the drawdown chart below to compare losses from any high point for SOPIX and URPIX.

Drawdown Indicators

	SOPIX	URPIX	Difference
Max Drawdown Largest peak-to-trough decline	-99.06%	-99.92%	+0.86%
Max Drawdown (1Y) Largest decline over 1 year	-27.12%	-36.41%	+9.29%
Max Drawdown (3Y) Largest decline over 3 years	-54.67%	-69.78%	+15.11%
Max Drawdown (5Y) Largest decline over 5 years	-64.84%	-76.89%	+12.05%
Max Drawdown (10Y) Largest decline over 10 years	-90.82%	-96.95%	+6.13%
Current Drawdown Current decline from peak	-99.06%	-99.92%	+0.86%
Average Drawdown Average peak-to-trough decline	-76.13%	-79.07%	+2.94%
Ulcer Index Depth and duration of drawdowns from previous peaks	13.18%	21.11%	-7.93%

Volatility

SOPIX vs. URPIX - Volatility Comparison

The current volatility for ProFunds Short NASDAQ-100 Fund (SOPIX) is 4.55%, while ProFunds UltraBear Fund (URPIX) has a volatility of 5.71%. This indicates that SOPIX experiences smaller price fluctuations and is considered to be less risky than URPIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SOPIX	URPIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.55%	5.71%	-1.16%
Volatility (6M) Calculated over the trailing 6-month period	12.18%	18.11%	-5.93%
Volatility (1Y) Calculated over the trailing 1-year period	16.04%	23.81%	-7.77%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.38%	33.83%	-10.45%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.49%	35.62%	-13.13%

SOPIX vs. URPIX - Expense Ratio Comparison

Both SOPIX and URPIX have an expense ratio of 1.78%.

Dividends

SOPIX vs. URPIX - Dividend Comparison

SOPIX's dividend yield for the trailing twelve months is around 2.57%, less than URPIX's 3.33% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
SOPIX ProFunds Short NASDAQ-100 Fund	2.57%	2.14%	0.00%	6.71%	0.00%	0.00%	0.00%	0.29%
URPIX ProFunds UltraBear Fund	3.33%	2.73%	0.00%	3.02%	0.00%	0.00%	0.47%	0.00%

Frequently Asked Questions

Can I hold both SOPIX and URPIX in my portfolio?

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

URPIX has higher volatility (5.71%) compared to SOPIX (4.55%). In terms of maximum drawdown, SOPIX dropped -99.06% vs URPIX's -99.92%.

Which has better risk-adjusted returns?

URPIX currently has the higher Sharpe Ratio (-1.56 vs -1.74), 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.