SOPIX vs. AFBIX

Last updated Aug 1, 2026

SOPIX (ProFunds Short NASDAQ-100 Fund) and AFBIX (Access Flex Bear High Yield ProFund) are both mutual funds - SOPIX is a Inverse Equities fund managed by ProFunds, while AFBIX is a Inverse Bonds fund managed by ProFunds. Over the past 10 years, SOPIX returned -19.61%/yr vs -4.10%/yr for AFBIX. Their 0.57 correlation means they have sometimes moved together and sometimes differently. Both charge a 1.78% expense ratio.

Performance

SOPIX vs. AFBIX - Performance Comparison

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

Returns By Period

In the year-to-date period, SOPIX achieves a -9.87% return, which is significantly lower than AFBIX's -0.91% return. Over the past 10 years, SOPIX has underperformed AFBIX with an annualized return of -19.61%, while AFBIX has yielded a comparatively higher -4.10% annualized return.

SOPIX

• 1D: -3.36%
• 1M: 4.31%
• 6M: -9.07%
• YTD: -9.87%
• 1Y: -17.52%
• 3Y*: -17.93%
• 5Y*: -14.03%
• 10Y*: -19.61%
• ALL TIME*: -17.47%

AFBIX

• 1D: -0.29%
• 1M: 0.37%
• 6M: -0.44%
• YTD: -0.91%
• 1Y: -2.99%
• 3Y*: -4.33%
• 5Y*: -1.89%
• 10Y*: -4.10%
• ALL TIME*: -7.67%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
AFBIX Access Flex Bear High Yield ProFund	$0.00	$0.00	$0.00
SOPIX ProFunds Short NASDAQ-100 Fund	$0.00	$0.00	$0.00

SOPIX vs. AFBIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SOPIX ProFunds Short NASDAQ-100 Fund	-9.87%	-15.80%	-23.82%	-31.85%	34.73%	-25.69%	-42.92%	-28.29%	-3.07%	-25.24%
AFBIX Access Flex Bear High Yield ProFund	-0.91%	-5.24%	-3.07%	-6.30%	8.01%	-4.55%	-6.63%	-12.62%	-0.42%	-4.51%

Correlation

The correlation between SOPIX and AFBIX is 0.67, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.67
Correlation (3Y) Balances recent behavior with more history.	0.60
Correlation (5Y) Shows whether the relationship held over a longer period.	0.64
Correlation (10Y) Provides a long-term view across more market conditions.	0.62
Correlation (All Time) Calculated using the full available price history since Jan 3, 2006	0.57

The correlation between SOPIX and AFBIX has been stable across timeframes, ranging from 0.57 to 0.67 - a consistent structural relationship.

Return for Risk

SOPIX vs. AFBIX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

SOPIX

SOPIX Risk / Return Rank: 1
SOPIX Sharpe Ratio Rank: 1
SOPIX Sortino Ratio Rank: 0
SOPIX Omega Ratio Rank: 1
SOPIX Calmar Ratio Rank: 1
SOPIX Martin Ratio Rank: 0

AFBIX

AFBIX Risk / Return Rank: 0
AFBIX Sharpe Ratio Rank: 1
AFBIX Sortino Ratio Rank: 1
AFBIX Omega Ratio Rank: 1
AFBIX Calmar Ratio Rank: 0
AFBIX Martin Ratio Rank: 0

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

SOPIX vs. AFBIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for ProFunds Short NASDAQ-100 Fund (SOPIX) and Access Flex Bear High Yield ProFund (AFBIX). 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.

	SOPIX	AFBIX	Difference
Sharpe ratio: Return per unit of total volatility	-0.80	-0.79	-0.02
Sortino ratio: Return per unit of downside risk	-1.09	-1.05	-0.04
Omega ratio: Gain probability vs. loss probability	0.88	0.88	0.00
Calmar ratio: Return relative to maximum drawdown	-0.62	-0.85	+0.23
Martin ratio: Return relative to average drawdown	-1.21	-1.42	+0.21

SOPIX vs. AFBIX - Sharpe Ratio Comparison

The current SOPIX Sharpe Ratio is -0.80, which is comparable to the AFBIX Sharpe Ratio of -0.79. The chart below compares the historical Sharpe Ratios of SOPIX and AFBIX, 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

SOPIX vs. AFBIX - Drawdown Comparison

The maximum SOPIX drawdown since its inception was -99.07%, which is greater than AFBIX's maximum drawdown of -82.12%. Use the drawdown chart below to compare losses from any high point for SOPIX and AFBIX.

Drawdown Indicators

	SOPIX	AFBIX	Difference
Max Drawdown Largest peak-to-trough decline	-99.07%	-82.12%	-16.95%
Max Drawdown (1Y) Largest decline over 1 year	-24.87%	-3.56%	-21.31%
Max Drawdown (3Y) Largest decline over 3 years	-54.87%	-17.80%	-37.07%
Max Drawdown (5Y) Largest decline over 5 years	-65.00%	-21.74%	-43.26%
Max Drawdown (10Y) Largest decline over 10 years	-89.76%	-34.59%	-55.17%
Current Drawdown Current decline from peak	-98.99%	-82.01%	-16.98%
Average Drawdown Average peak-to-trough decline	-76.28%	-57.96%	-18.32%
Ulcer Index Depth and duration of drawdowns from previous peaks	12.79%	2.17%	+10.62%

Volatility

SOPIX vs. AFBIX - Volatility Comparison

ProFunds Short NASDAQ-100 Fund (SOPIX) has a higher volatility of 6.90% compared to Access Flex Bear High Yield ProFund (AFBIX) at 0.83%. This indicates that SOPIX's price experiences larger fluctuations and is considered to be riskier than AFBIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SOPIX	AFBIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.90%	0.83%	+6.07%
Volatility (6M) Calculated over the trailing 6-month period	15.93%	3.18%	+12.75%
Volatility (1Y) Calculated over the trailing 1-year period	19.30%	3.88%	+15.42%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.86%	7.29%	+16.57%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.69%	7.89%	+14.80%

SOPIX vs. AFBIX - Expense Ratio Comparison

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

Dividends

SOPIX vs. AFBIX - Dividend Comparison

SOPIX's dividend yield for the trailing twelve months is around 2.38%, while AFBIX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
AFBIX Access Flex Bear High Yield ProFund	0.00%	0.00%	0.00%	0.00%	0.03%	0.00%	0.00%	0.00%
SOPIX ProFunds Short NASDAQ-100 Fund	2.38%	2.14%	0.00%	6.71%	0.00%	0.00%	0.00%	0.29%

Frequently Asked Questions

Can I hold both SOPIX and AFBIX in my portfolio?

SOPIX and AFBIX have a correlation of 0.67, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SOPIX or AFBIX?

SOPIX has higher volatility (6.90%) compared to AFBIX (0.83%). In terms of maximum drawdown, SOPIX dropped -99.07% vs AFBIX's -82.12%.

Which has better risk-adjusted returns?

AFBIX currently has the higher Sharpe Ratio (-0.79 vs -0.80), 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.