BIRIX vs. WFSPX
BIRIX (BlackRock Sustainable Advantage Large Cap Core Fund) and WFSPX (iShares S&P 500 Index Fund Class K) are both mutual funds - BIRIX is a Large Cap Blend Equities fund managed by BlackRock, while WFSPX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, BIRIX returned 15.24%/yr vs 15.14%/yr for WFSPX. With a 0.99 correlation, they move nearly in lockstep. BIRIX charges 0.48%/yr vs 0.03%/yr for WFSPX.
Performance
BIRIX vs. WFSPX - Performance Comparison
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Returns By Period
In the year-to-date period, BIRIX achieves a 13.00% return, which is significantly higher than WFSPX's 11.30% return. Both investments have delivered pretty close results over the past 10 years, with BIRIX having a 15.24% annualized return and WFSPX not far behind at 15.14%.
BIRIX
- 1D
- 0.26%
- 1M
- 0.30%
- 6M
- 11.77%
- YTD
- 13.00%
- 1Y
- 26.00%
- 3Y*
- 20.59%
- 5Y*
- 12.62%
- 10Y*
- 15.24%
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%
BIRIX vs. WFSPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
BIRIX BlackRock Sustainable Advantage Large Cap Core Fund | 13.00% | 18.97% | 21.83% | 25.55% | -19.73% | 28.16% | 22.41% | 31.19% | -5.94% | 20.95% |
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% |
Correlation
The correlation between BIRIX and WFSPX is 0.99 - 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 | 0.99 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.98 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.99 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.99 |
Correlation (All Time) Calculated using the full available price history since Jan 4, 2016 | 0.99 |
The correlation between BIRIX and WFSPX has been stable across timeframes, ranging from 0.98 to 0.99 - a consistent structural relationship.
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Return for Risk
BIRIX vs. WFSPX — Risk / Return Rank
BIRIX
WFSPX
BIRIX vs. WFSPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for BlackRock Sustainable Advantage Large Cap Core Fund (BIRIX) 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.
| BIRIX | WFSPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.22 | ||
| Sortino ratioReturn per unit of downside risk | +0.30 | ||
| Omega ratioGain probability vs. loss probability | 1.36 | 1.33 | +0.03 |
| Calmar ratioReturn relative to maximum drawdown | 3.12 | 2.56 | +0.57 |
| Martin ratioReturn relative to average drawdown | 14.05 | 11.22 | +2.83 |
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Drawdowns
BIRIX vs. WFSPX - Drawdown Comparison
The maximum BIRIX drawdown since its inception was -34.67%, smaller than the maximum WFSPX drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for BIRIX and WFSPX.
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Drawdown Indicators
| BIRIX | WFSPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -34.67% | -58.21% | +23.54% |
Max Drawdown (1Y)Largest decline over 1 year | -8.46% | -8.90% | +0.44% |
Max Drawdown (3Y)Largest decline over 3 years | -20.97% | -18.74% | -2.23% |
Max Drawdown (5Y)Largest decline over 5 years | -25.88% | -24.51% | -1.37% |
Max Drawdown (10Y)Largest decline over 10 years | -34.67% | -33.74% | -0.93% |
Current DrawdownCurrent decline from peak | -0.26% | -0.35% | +0.09% |
Average DrawdownAverage peak-to-trough decline | -4.91% | -12.74% | +7.83% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.88% | 2.03% | -0.15% |
Volatility
BIRIX vs. WFSPX - Volatility Comparison
BlackRock Sustainable Advantage Large Cap Core Fund (BIRIX) and iShares S&P 500 Index Fund Class K (WFSPX) have volatilities of 3.70% and 3.61%, 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
| BIRIX | WFSPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 3.70% | 3.61% | +0.09% |
Volatility (6M)Calculated over the trailing 6-month period | 10.43% | 9.98% | +0.45% |
Volatility (1Y)Calculated over the trailing 1-year period | 12.99% | 12.54% | +0.45% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 18.69% | 16.99% | +1.70% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 19.04% | 18.01% | +1.03% |
BIRIX vs. WFSPX - Expense Ratio Comparison
BIRIX has a 0.48% expense ratio, which is higher than WFSPX's 0.03% expense ratio.
Dividends
BIRIX vs. WFSPX - Dividend Comparison
BIRIX's dividend yield for the trailing twelve months is around 5.76%, more than WFSPX's 1.64% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BIRIX BlackRock Sustainable Advantage Large Cap Core Fund | 5.76% | 6.51% | 15.58% | 1.01% | 1.22% | 5.79% | 3.69% | 2.95% | 8.26% | 4.89% | 2.78% | 0.00% |
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
With a correlation of 0.99, BIRIX 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.
BIRIX has higher volatility (3.70%) compared to WFSPX (3.61%). In terms of maximum drawdown, BIRIX dropped -34.67% vs WFSPX's -58.21%.
BIRIX currently has the higher Sharpe Ratio (2.04 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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