STLEX vs. WFSPX
STLEX (BlackRock LifePath Dynamic 2040 Fund) and WFSPX (iShares S&P 500 Index Fund Class K) are both mutual funds - STLEX is a Target Retirement Date fund managed by BlackRock, while WFSPX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, STLEX returned 10.14%/yr vs 15.51%/yr for WFSPX. Their correlation of 0.95 suggests significant overlap in exposure. STLEX charges 0.47%/yr vs 0.03%/yr for WFSPX.
Performance
STLEX vs. WFSPX - Performance Comparison
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Returns By Period
The year-to-date returns for both investments are quite close, with STLEX having a 8.04% return and WFSPX slightly higher at 8.19%. Over the past 10 years, STLEX has underperformed WFSPX with an annualized return of 10.14%, while WFSPX has yielded a comparatively higher 15.51% annualized return.
STLEX
- 1D
- -1.60%
- 1M
- -0.49%
- YTD
- 8.04%
- 6M
- 7.24%
- 1Y
- 18.16%
- 3Y*
- 12.90%
- 5Y*
- 6.41%
- 10Y*
- 10.14%
WFSPX
- 1D
- -1.43%
- 1M
- -1.34%
- YTD
- 8.19%
- 6M
- 6.86%
- 1Y
- 22.29%
- 3Y*
- 20.77%
- 5Y*
- 13.11%
- 10Y*
- 15.51%
STLEX vs. WFSPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
STLEX BlackRock LifePath Dynamic 2040 Fund | 8.04% | 16.87% | 4.80% | 19.45% | -17.10% | 16.01% | 14.01% | 25.74% | -7.40% | 20.00% |
WFSPX iShares S&P 500 Index Fund Class K | 8.19% | 17.83% | 24.94% | 26.25% | -18.14% | 28.63% | 18.43% | 31.45% | -4.83% | 21.27% |
Correlation
The correlation between STLEX and WFSPX is 0.93, 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 | 0.93 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.90 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.92 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.91 |
Correlation (All Time) Calculated using the full available price history since Feb 25, 1994 | 0.95 |
The correlation between STLEX and WFSPX has been stable across timeframes, ranging from 0.90 to 0.95 - a consistent structural relationship.
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Return for Risk
STLEX vs. WFSPX — Risk / Return Rank
STLEX
WFSPX
STLEX vs. WFSPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for BlackRock LifePath Dynamic 2040 Fund (STLEX) and iShares S&P 500 Index Fund Class K (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.
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.
| STLEX | WFSPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.19 | ||
| Sortino ratioReturn per unit of downside risk | -0.18 | ||
| Omega ratioGain probability vs. loss probability | 1.31 | 1.34 | -0.03 |
| Calmar ratioReturn relative to maximum drawdown | 2.58 | 2.67 | -0.09 |
| Martin ratioReturn relative to average drawdown | 10.98 | 11.99 | -1.01 |
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Drawdowns
STLEX vs. WFSPX - Drawdown Comparison
The maximum STLEX drawdown since its inception was -54.19%, smaller than the maximum WFSPX drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for STLEX and WFSPX.
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Drawdown Indicators
| STLEX | WFSPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -54.19% | -58.21% | +4.02% |
Max Drawdown (1Y)Largest decline over 1 year | -7.59% | -8.90% | +1.31% |
Max Drawdown (3Y)Largest decline over 3 years | -19.71% | -18.74% | -0.97% |
Max Drawdown (5Y)Largest decline over 5 years | -24.93% | -24.51% | -0.42% |
Max Drawdown (10Y)Largest decline over 10 years | -33.13% | -33.74% | +0.61% |
Current DrawdownCurrent decline from peak | -2.22% | -3.13% | +0.91% |
Average DrawdownAverage peak-to-trough decline | -9.27% | -12.76% | +3.49% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.78% | 1.98% | -0.20% |
Volatility
STLEX vs. WFSPX - Volatility Comparison
BlackRock LifePath Dynamic 2040 Fund (STLEX) and iShares S&P 500 Index Fund Class K (WFSPX) have volatilities of 4.71% and 4.90%, 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.
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Volatility by Period
| STLEX | WFSPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.71% | 4.90% | -0.19% |
Volatility (6M)Calculated over the trailing 6-month period | 9.49% | 9.93% | -0.44% |
Volatility (1Y)Calculated over the trailing 1-year period | 11.47% | 12.56% | -1.09% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 14.67% | 16.98% | -2.31% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 14.66% | 18.04% | -3.38% |
STLEX vs. WFSPX - Expense Ratio Comparison
STLEX has a 0.47% expense ratio, which is higher than WFSPX's 0.03% expense ratio.
Dividends
STLEX vs. WFSPX - Dividend Comparison
STLEX's dividend yield for the trailing twelve months is around 5.68%, more than WFSPX's 1.61% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
STLEX BlackRock LifePath Dynamic 2040 Fund | 5.68% | 6.14% | 2.31% | 4.81% | 2.21% | 20.42% | 4.25% | 6.64% | 14.47% | 14.38% | 1.84% | 10.65% |
WFSPX iShares S&P 500 Index Fund Class K | 1.61% | 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 0.93, STLEX 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 (4.90%) compared to STLEX (4.71%). In terms of maximum drawdown, STLEX dropped -54.19% vs WFSPX's -58.21%.
WFSPX currently has the higher Sharpe Ratio (1.90 vs 1.71), 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.
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