STFAX vs. WFSPX

Last updated Apr 1, 2026

Compare and contrast key facts about State Street Equity 500 Index Fund (STFAX) and iShares S&P 500 Index Fund (WFSPX).

STFAX is managed by State Street. It was launched on Apr 18, 2001. WFSPX is a passively managed fund by BlackRock that tracks the performance of the S&P 500 Index. It was launched on Jul 30, 1993.

Performance

STFAX vs. WFSPX - Performance Comparison

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

STFAX vs. WFSPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
STFAX State Street Equity 500 Index Fund	-7.09%	17.63%	24.80%	26.09%	-18.28%	28.31%	-88.19%	31.13%	-4.52%	21.43%
WFSPX iShares S&P 500 Index Fund	-4.63%	17.83%	24.94%	26.25%	-18.14%	28.63%	18.43%	31.45%	-4.83%	21.27%

Returns By Period

In the year-to-date period, STFAX achieves a -7.09% return, which is significantly lower than WFSPX's -4.63% return. Over the past 10 years, STFAX has underperformed WFSPX with an annualized return of -9.83%, while WFSPX has yielded a comparatively higher 13.92% annualized return.

STFAX

• 1D: -0.39%
• 1M: -7.68%
• YTD: -7.09%
• 6M: -4.67%
• 1Y: 14.23%
• 3Y*: 16.98%
• 5Y*: 11.20%
• 10Y*: -9.83%

WFSPX

• 1D: 2.62%
• 1M: -5.31%
• YTD: -4.63%
• 6M: -2.47%
• 1Y: 16.96%
• 3Y*: 18.15%
• 5Y*: 11.69%
• 10Y*: 13.92%

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

STFAX vs. WFSPX - Expense Ratio Comparison

STFAX has a 0.17% expense ratio, which is higher than WFSPX's 0.03% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

STFAX

State Street Equity 500 Index Fund

WFSPX

iShares S&P 500 Index Fund

Return for Risk

STFAX vs. WFSPX — Risk / Return Rank

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

STFAX

STFAX Risk / Return Rank: 43
STFAX Sharpe Ratio Rank: 38
STFAX Sortino Ratio Rank: 42
STFAX Omega Ratio Rank: 46
STFAX Calmar Ratio Rank: 40
STFAX Martin Ratio Rank: 51

WFSPX

WFSPX Risk / Return Rank: 58
WFSPX Sharpe Ratio Rank: 46
WFSPX Sortino Ratio Rank: 51
WFSPX Omega Ratio Rank: 54
WFSPX Calmar Ratio Rank: 62
WFSPX Martin Ratio Rank: 74

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.

STFAX vs. WFSPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street Equity 500 Index Fund (STFAX) 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.

	STFAX	WFSPX	Difference
Sharpe ratio Return per unit of total volatility	0.83	0.96	-0.13
Sortino ratio Return per unit of downside risk	1.28	1.47	-0.18
Omega ratio Gain probability vs. loss probability	1.20	1.22	-0.03
Calmar ratio Return relative to maximum drawdown	1.04	1.49	-0.45
Martin ratio Return relative to average drawdown	5.05	7.15	-2.10
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

STFAX vs. WFSPX - Sharpe Ratio Comparison

The current STFAX Sharpe Ratio is 0.83, which is comparable to the WFSPX Sharpe Ratio of 0.96. The chart below compares the historical Sharpe Ratios of STFAX and WFSPX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	STFAX	WFSPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.83	0.96	-0.13
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.67	0.70	-0.03
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.29	0.78	-1.07
Sharpe Ratio (All Time) Calculated using the full available price history	-0.07	0.13	-0.20

Correlation

The correlation between STFAX and WFSPX is 0.99, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

STFAX vs. WFSPX - Dividend Comparison

STFAX's dividend yield for the trailing twelve months is around 1.39%, less than WFSPX's 1.54% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
STFAX State Street Equity 500 Index Fund	1.39%	1.29%	1.47%	1.63%	2.01%	2.61%	1.71%	4.28%	5.02%	5.78%	1.92%	1.69%
WFSPX iShares S&P 500 Index Fund	1.54%	1.72%	1.41%	1.50%	2.02%	1.82%	1.66%	1.99%	2.00%	1.62%	2.37%	2.49%

Drawdowns

STFAX vs. WFSPX - Drawdown Comparison

The maximum STFAX drawdown since its inception was -91.92%, which is greater than WFSPX's maximum drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for STFAX and WFSPX.

Drawdown Indicators

	STFAX	WFSPX	Difference
Max Drawdown Largest peak-to-trough decline	-91.92%	-58.21%	-33.71%
Max Drawdown (1Y) Largest decline over 1 year	-12.10%	-12.11%	+0.01%
Max Drawdown (5Y) Largest decline over 5 years	-24.57%	-24.51%	-0.06%
Max Drawdown (10Y) Largest decline over 10 years	-91.92%	-33.74%	-58.18%
Current Drawdown Current decline from peak	-79.72%	-6.51%	-73.21%
Average Drawdown Average peak-to-trough decline	-29.32%	-12.84%	-16.48%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.50%	2.53%	-0.03%

Volatility

STFAX vs. WFSPX - Volatility Comparison

The current volatility for State Street Equity 500 Index Fund (STFAX) is 4.24%, while iShares S&P 500 Index Fund (WFSPX) has a volatility of 5.17%. This indicates that STFAX experiences smaller price fluctuations and is considered to be less risky than WFSPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	STFAX	WFSPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.24%	5.17%	-0.93%
Volatility (6M) Calculated over the trailing 6-month period	9.08%	9.44%	-0.36%
Volatility (1Y) Calculated over the trailing 1-year period	18.10%	18.21%	-0.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.84%	16.88%	-0.04%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	33.63%	18.00%	+15.63%