AFBIX vs. SOPIX

Last updated Jun 4, 2026

AFBIX (Access Flex Bear High Yield ProFund) and SOPIX (ProFunds Short NASDAQ-100 Fund) are both mutual funds - AFBIX is a Inverse Bonds fund managed by ProFunds, while SOPIX is a Inverse Equities fund managed by ProFunds. Over the past 10 years, AFBIX returned -4.42%/yr vs -20.74%/yr for SOPIX. A 0.57 correlation means they provide meaningful diversification when combined. Both charge a 1.78% expense ratio.

Performance

AFBIX vs. SOPIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Access Flex Bear High Yield ProFund (AFBIX) 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, AFBIX achieves a -1.02% return, which is significantly higher than SOPIX's -16.96% return. Over the past 10 years, AFBIX has outperformed SOPIX with an annualized return of -4.42%, while SOPIX has yielded a comparatively lower -20.74% annualized return.

AFBIX

• 1D: -0.07%
• 1M: -0.66%
• YTD: -1.02%
• 6M: -1.27%
• 1Y: -4.16%
• 3Y*: -4.55%
• 5Y*: -2.12%
• 10Y*: -4.42%

SOPIX

• 1D: -0.46%
• 1M: -9.63%
• YTD: -16.96%
• 6M: -15.51%
• 1Y: -27.05%
• 3Y*: -21.92%
• 5Y*: -17.02%
• 10Y*: -20.74%

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

AFBIX vs. SOPIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AFBIX Access Flex Bear High Yield ProFund	-1.02%	-5.24%	-3.07%	-6.30%	8.01%	-4.55%	-6.63%	-12.62%	-0.42%	-4.51%
SOPIX ProFunds Short NASDAQ-100 Fund	-16.96%	-15.80%	-23.82%	-31.85%	34.73%	-25.69%	-42.92%	-28.29%	-3.07%	-25.24%

Correlation

The correlation between AFBIX and SOPIX is 0.67, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.67
Correlation (3Y) Calculated over the trailing 3-year period	0.60
Correlation (5Y) Calculated over the trailing 5-year period	0.65
Correlation (10Y) Calculated over the trailing 10-year period	0.62
Correlation (All Time) Calculated using the full available price history since Jan 4, 2006	0.57

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

Return for Risk

AFBIX vs. SOPIX — Risk / Return Rank

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

AFBIX

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

AFBIX vs. SOPIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Access Flex Bear High Yield ProFund (AFBIX) 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.

	AFBIX	SOPIX	Difference
Sharpe ratio: Return per unit of total volatility	-1.14	-1.73	+0.59
Sortino ratio: Return per unit of downside risk	-1.53	-2.60	+1.07
Omega ratio: Gain probability vs. loss probability	0.82	0.73	+0.10
Calmar ratio: Return relative to maximum drawdown	-1.00	-1.01	+0.01
Martin ratio: Return relative to average drawdown	-1.51	-2.19	+0.68
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AFBIX vs. SOPIX - Sharpe Ratio Comparison

The current AFBIX Sharpe Ratio is -1.14, which is higher than the SOPIX Sharpe Ratio of -1.73. The chart below compares the historical Sharpe Ratios of AFBIX 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

	AFBIX	SOPIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-1.14	-1.73	+0.59
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.29	-0.73	+0.44
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.56	-0.92	+0.36
Sharpe Ratio (All Time) Calculated using the full available price history	-0.95	-0.81	-0.13

Drawdowns

AFBIX vs. SOPIX - Drawdown Comparison

The maximum AFBIX drawdown since its inception was -82.03%, smaller than the maximum SOPIX drawdown of -99.07%. Use the drawdown chart below to compare losses from any high point for AFBIX and SOPIX.

Drawdown Indicators

	AFBIX	SOPIX	Difference
Max Drawdown Largest peak-to-trough decline	-82.03%	-99.07%	+17.04%
Max Drawdown (1Y) Largest decline over 1 year	-4.36%	-27.45%	+23.09%
Max Drawdown (3Y) Largest decline over 3 years	-17.40%	-54.87%	+37.47%
Max Drawdown (5Y) Largest decline over 5 years	-21.36%	-65.00%	+43.64%
Max Drawdown (10Y) Largest decline over 10 years	-36.43%	-90.86%	+54.43%
Current Drawdown Current decline from peak	-82.03%	-99.07%	+17.04%
Average Drawdown Average peak-to-trough decline	-57.78%	-76.14%	+18.36%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.88%	12.80%	-9.92%

Volatility

AFBIX vs. SOPIX - Volatility Comparison

The current volatility for Access Flex Bear High Yield ProFund (AFBIX) is 1.22%, while ProFunds Short NASDAQ-100 Fund (SOPIX) has a volatility of 4.53%. This indicates that AFBIX 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

	AFBIX	SOPIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.22%	4.53%	-3.31%
Volatility (6M) Calculated over the trailing 6-month period	3.01%	12.16%	-9.15%
Volatility (1Y) Calculated over the trailing 1-year period	3.81%	16.01%	-12.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	7.29%	23.38%	-16.09%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	7.91%	22.49%	-14.58%

AFBIX vs. SOPIX - Expense Ratio Comparison

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

Dividends

AFBIX vs. SOPIX - Dividend Comparison

AFBIX has not paid dividends to shareholders, while SOPIX's dividend yield for the trailing twelve months is around 2.58%.

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	2.58%	2.14%	0.00%	6.71%	0.00%	0.00%	0.00%	0.29%

Frequently Asked Questions

Can I hold both AFBIX and SOPIX in my portfolio?

AFBIX and SOPIX 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, AFBIX or SOPIX?

SOPIX has higher volatility (4.53%) compared to AFBIX (1.22%). In terms of maximum drawdown, AFBIX dropped -82.03% vs SOPIX's -99.07%.

Which has better risk-adjusted returns?

AFBIX currently has the higher Sharpe Ratio (-1.14 vs -1.73), 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.