PortfoliosLab logoPortfoliosLab logo

Documentation

Upgrade your plan
RYSOX vs. WFSPX
Performance
Return for Risk
Drawdowns
Volatility
Dividends

RYSOX vs. WFSPX

Last updated Jun 4, 2026

RYSOX (Rydex S&P 500 Fund) and WFSPX (iShares S&P 500 Index Fund) are both S&P 500 funds tracking the S&P 500 Index, from Rydex Funds and BlackRock respectively. Both are passively managed. Over the past 10 years, RYSOX returned 13.70%/yr vs 15.46%/yr for WFSPX. With a 1.00 correlation, they move nearly in lockstep. RYSOX charges 1.56%/yr vs 0.03%/yr for WFSPX.

Performance

RYSOX vs. WFSPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Rydex S&P 500 Fund (RYSOX) and iShares S&P 500 Index Fund (WFSPX). The values are adjusted to include any dividend payments, if applicable.

Loading charts...

Returns By Period

The year-to-date returns for both stocks are quite close, with RYSOX having a 10.94% return and WFSPX slightly lower at 10.87%. Over the past 10 years, RYSOX has underperformed WFSPX with an annualized return of 13.70%, while WFSPX has yielded a comparatively higher 15.46% annualized return.

RYSOX

1D
0.13%
1M
5.66%
YTD
10.94%
6M
10.81%
1Y
26.91%
3Y*
20.74%
5Y*
12.41%
10Y*
13.70%

WFSPX

1D
-0.74%
1M
4.17%
YTD
10.87%
6M
10.77%
1Y
27.97%
3Y*
22.41%
5Y*
13.88%
10Y*
15.46%
*Multi-year figures are annualized to reflect compound growth (CAGR)

RYSOX vs. WFSPX - Yearly Performance Comparison

2026 (YTD)202520242023202220212020201920182017
RYSOX
Rydex S&P 500 Fund		10.94%15.93%22.98%24.15%-19.47%26.68%16.25%29.15%-6.01%19.53%
WFSPX
iShares S&P 500 Index Fund		10.87%17.83%24.94%26.25%-18.14%28.63%18.43%31.45%-4.83%21.27%

Correlation

The correlation between RYSOX and WFSPX is 1.00 - 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

1.00

Correlation (3Y)
Calculated over the trailing 3-year period

1.00

Correlation (5Y)
Calculated over the trailing 5-year period

1.00

Correlation (10Y)
Calculated over the trailing 10-year period

1.00

Correlation (All Time)
Calculated using the full available price history since Jan 4, 2007

1.00

The correlation between RYSOX and WFSPX has been stable across timeframes, ranging from 1.00 to 1.00 - a consistent structural relationship.

Compare stocks, funds, or ETFs

Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.

Rydex S&P 500 Fund

iShares S&P 500 Index Fund

Often compared with RYSOX:
RYSOX vs. GMRYSOX vs. SPYRYSOX vs. VOORYSOX vs. UPRORYSOX vs. FDFIXRYSOX vs. INDEXRYSOX vs. VFV.TO
Often compared with WFSPX:
WFSPX vs. JLGMXWFSPX vs. VOOWFSPX vs. FSPGXWFSPX vs. FXAIXWFSPX vs. BRMKXWFSPX vs. IVVWFSPX vs. APGYX

Return for Risk

RYSOX vs. WFSPX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.
RYSOX
RYSOX Risk / Return Rank: 6363
Overall Rank
RYSOX Sharpe Ratio Rank: 6464
Sharpe Ratio Rank
RYSOX Sortino Ratio Rank: 5858
Sortino Ratio Rank
RYSOX Omega Ratio Rank: 5959
Omega Ratio Rank
RYSOX Calmar Ratio Rank: 6363
Calmar Ratio Rank
RYSOX Martin Ratio Rank: 7474
Martin Ratio Rank
WFSPX
WFSPX Risk / Return Rank: 6666
Overall Rank
WFSPX Sharpe Ratio Rank: 6464
Sharpe Ratio Rank
WFSPX Sortino Ratio Rank: 5959
Sortino Ratio Rank
WFSPX Omega Ratio Rank: 6060
Omega Ratio Rank
WFSPX Calmar Ratio Rank: 6767
Calmar Ratio Rank
WFSPX Martin Ratio Rank: 7979
Martin Ratio Rank
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.

RYSOX vs. WFSPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Rydex S&P 500 Fund (RYSOX) and iShares S&P 500 Index Fund (WFSPX). 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.

RYSOXWFSPXDifference
Sharpe ratioReturn per unit of total volatility
2.34
2.37

-0.02

Sortino ratioReturn per unit of downside risk
3.20
3.24

-0.03

Omega ratioGain probability vs. loss probability

1.43

1.43

0.00

Calmar ratioReturn relative to maximum drawdown

3.06

3.16

-0.10

Martin ratioReturn relative to average drawdown

14.00

14.75

-0.75

Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

RYSOX vs. WFSPX - Sharpe Ratio Comparison

The current RYSOX Sharpe Ratio is 2.34, which is comparable to the WFSPX Sharpe Ratio of 2.37. The chart below compares the historical Sharpe Ratios of RYSOX and WFSPX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Loading charts...

Sharpe Ratios by Period

RYSOXWFSPXDifference

Sharpe Ratio (1Y)

Calculated over the trailing 1-year period

2.34

2.37

-0.02

Sharpe Ratio (5Y)

Calculated over the trailing 5-year period

0.74

0.83

-0.09

Sharpe Ratio (10Y)

Calculated over the trailing 10-year period

0.76

0.86

-0.10

Sharpe Ratio (All Time)

Calculated using the full available price history

0.48

0.13

+0.35

Drawdowns

RYSOX vs. WFSPX - Drawdown Comparison

The maximum RYSOX drawdown since its inception was -55.24%, smaller than the maximum WFSPX drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for RYSOX and WFSPX.

Loading charts...

Drawdown Indicators

RYSOXWFSPXDifference

Max Drawdown

Largest peak-to-trough decline

-55.24%

-58.21%

+2.97%

Max Drawdown (1Y)

Largest decline over 1 year

-9.06%

-8.90%

-0.16%

Max Drawdown (3Y)

Largest decline over 3 years

-18.94%

-18.74%

-0.20%

Max Drawdown (5Y)

Largest decline over 5 years

-25.45%

-24.51%

-0.94%

Max Drawdown (10Y)

Largest decline over 10 years

-34.05%

-33.74%

-0.31%

Current Drawdown

Current decline from peak

0.00%

-0.74%

+0.74%

Average Drawdown

Average peak-to-trough decline

-8.27%

-12.77%

+4.50%

Ulcer Index

Depth and duration of drawdowns from previous peaks

1.98%

1.90%

+0.08%

Volatility

RYSOX vs. WFSPX - Volatility Comparison

Rydex S&P 500 Fund (RYSOX) and iShares S&P 500 Index Fund (WFSPX) have volatilities of 2.82% and 2.92%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Loading charts...

Volatility by Period

RYSOXWFSPXDifference

Volatility (1M)

Calculated over the trailing 1-month period

2.82%

2.92%

-0.10%

Volatility (6M)

Calculated over the trailing 6-month period

8.95%

8.99%

-0.04%

Volatility (1Y)

Calculated over the trailing 1-year period

11.85%

11.88%

-0.03%

Volatility (5Y)

Calculated over the trailing 5-year period, annualized

16.90%

16.88%

+0.02%

Volatility (10Y)

Calculated over the trailing 10-year period, annualized

18.09%

18.02%

+0.07%

RYSOX vs. WFSPX - Expense Ratio Comparison

RYSOX has a 1.56% expense ratio, which is higher than WFSPX's 0.03% expense ratio.

Dividends

RYSOX vs. WFSPX - Dividend Comparison

RYSOX's dividend yield for the trailing twelve months is around 2.39%, more than WFSPX's 1.58% yield.

PositionTTM20252024202320222021202020192018201720162015
RYSOX
Rydex S&P 500 Fund		2.39%2.65%1.08%0.60%1.17%1.25%13.42%0.93%1.69%4.56%0.84%4.01%
WFSPX
iShares S&P 500 Index Fund		1.58%1.72%1.41%1.50%2.02%1.82%1.66%1.99%2.00%1.62%2.37%2.49%

Frequently Asked Questions

With a correlation of 1.00, RYSOX and WFSPX 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.

WFSPX has higher volatility (2.92%) compared to RYSOX (2.82%). In terms of maximum drawdown, RYSOX dropped -55.24% vs WFSPX's -58.21%.

WFSPX currently has the higher Sharpe Ratio (2.37 vs 2.34), 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.

Portfolio Optimizer

Find the right allocation for RYSOX and WFSPX

Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.

Open Portfolio Optimizer