WFSPX vs. BACAX
WFSPX (iShares S&P 500 Index Fund Class K) and BACAX (BlackRock Energy Opportunities Fund) are both mutual funds - WFSPX is a S&P 500 fund tracking the S&P 500 Index, while BACAX is a Energy Equities fund managed by BlackRock. Over the past 10 years, WFSPX returned 15.14%/yr vs 7.96%/yr for BACAX. A 0.58 correlation means they provide meaningful diversification when combined. WFSPX charges 0.03%/yr vs 1.32%/yr for BACAX.
Performance
WFSPX vs. BACAX - Performance Comparison
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Returns By Period
In the year-to-date period, WFSPX achieves a 11.30% return, which is significantly lower than BACAX's 26.90% return. Over the past 10 years, WFSPX has outperformed BACAX with an annualized return of 15.14%, while BACAX has yielded a comparatively lower 7.96% annualized return.
WFSPX
- 1D
- 0.39%
- 1M
- 0.88%
- 6M
- 9.66%
- YTD
- 11.30%
- 1Y
- 22.27%
- 3Y*
- 20.44%
- 5Y*
- 13.42%
- 10Y*
- 15.14%
BACAX
- 1D
- -0.79%
- 1M
- 2.61%
- 6M
- 21.58%
- YTD
- 26.90%
- 1Y
- 33.95%
- 3Y*
- 15.53%
- 5Y*
- 20.66%
- 10Y*
- 7.96%
WFSPX vs. BACAX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
WFSPX iShares S&P 500 Index Fund Class K | 11.30% | 17.83% | 24.94% | 26.25% | -18.14% | 28.63% | 18.43% | 31.45% | -4.83% | 21.27% |
BACAX BlackRock Energy Opportunities Fund | 26.90% | 10.53% | 3.78% | 2.61% | 43.02% | 42.93% | -29.68% | 12.64% | -19.98% | 2.07% |
Correlation
The correlation between WFSPX and BACAX is -0.10, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | -0.10 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.16 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.31 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.44 |
Correlation (All Time) Calculated using the full available price history since Feb 24, 2005 | 0.58 |
The correlation between WFSPX and BACAX shifts across timeframes, from -0.10 (1 year) to 0.58 (all time), reflecting how their relationship changes across market environments.
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Return for Risk
WFSPX vs. BACAX — Risk / Return Rank
WFSPX
BACAX
WFSPX vs. BACAX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares S&P 500 Index Fund Class K (WFSPX) and BlackRock Energy Opportunities Fund (BACAX). 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.
| WFSPX | BACAX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.05 | ||
| Sortino ratioReturn per unit of downside risk | +0.03 | ||
| Omega ratioGain probability vs. loss probability | 1.33 | 1.31 | +0.02 |
| Calmar ratioReturn relative to maximum drawdown | 2.56 | 2.47 | +0.09 |
| Martin ratioReturn relative to average drawdown | 11.22 | 7.42 | +3.80 |
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Drawdowns
WFSPX vs. BACAX - Drawdown Comparison
The maximum WFSPX drawdown since its inception was -58.21%, smaller than the maximum BACAX drawdown of -78.88%. Use the drawdown chart below to compare losses from any high point for WFSPX and BACAX.
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Drawdown Indicators
| WFSPX | BACAX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -58.21% | -78.88% | +20.67% |
Max Drawdown (1Y)Largest decline over 1 year | -8.90% | -13.36% | +4.46% |
Max Drawdown (3Y)Largest decline over 3 years | -18.74% | -18.73% | -0.01% |
Max Drawdown (5Y)Largest decline over 5 years | -24.51% | -25.74% | +1.23% |
Max Drawdown (10Y)Largest decline over 10 years | -33.74% | -65.92% | +32.18% |
Current DrawdownCurrent decline from peak | -0.35% | -7.33% | +6.98% |
Average DrawdownAverage peak-to-trough decline | -12.74% | -34.14% | +21.40% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.03% | 4.44% | -2.41% |
Volatility
WFSPX vs. BACAX - Volatility Comparison
The current volatility for iShares S&P 500 Index Fund Class K (WFSPX) is 3.61%, while BlackRock Energy Opportunities Fund (BACAX) has a volatility of 6.47%. This indicates that WFSPX experiences smaller price fluctuations and is considered to be less risky than BACAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| WFSPX | BACAX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 3.61% | 6.47% | -2.86% |
Volatility (6M)Calculated over the trailing 6-month period | 9.98% | 14.68% | -4.70% |
Volatility (1Y)Calculated over the trailing 1-year period | 12.54% | 17.72% | -5.18% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 16.99% | 23.47% | -6.48% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.01% | 27.15% | -9.14% |
WFSPX vs. BACAX - Expense Ratio Comparison
WFSPX has a 0.03% expense ratio, which is lower than BACAX's 1.32% expense ratio.
Dividends
WFSPX vs. BACAX - Dividend Comparison
WFSPX's dividend yield for the trailing twelve months is around 1.64%, less than BACAX's 1.95% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BACAX BlackRock Energy Opportunities Fund | 1.95% | 2.47% | 2.29% | 3.06% | 2.21% | 2.39% | 3.38% | 2.69% | 2.87% | 2.48% | 1.95% | 1.98% |
WFSPX iShares S&P 500 Index Fund Class K | 1.64% | 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
WFSPX and BACAX have a correlation of -0.10, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
BACAX has higher volatility (6.47%) compared to WFSPX (3.61%). In terms of maximum drawdown, WFSPX dropped -58.21% vs BACAX's -78.88%.
BACAX currently has the higher Sharpe Ratio (1.87 vs 1.82), 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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