BRMKX vs. WFSPX
BRMKX (iShares Russell Mid-Cap Index Fund) and WFSPX (iShares S&P 500 Index Fund Class K) are both mutual funds - BRMKX is a Mid 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, BRMKX returned 11.53%/yr vs 15.03%/yr for WFSPX. Their correlation of 0.90 means they have usually moved in the same direction. BRMKX charges 0.06%/yr vs 0.03%/yr for WFSPX.
Performance
BRMKX vs. WFSPX - Performance Comparison
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Returns By Period
In the year-to-date period, BRMKX achieves a 14.65% return, which is significantly higher than WFSPX's 10.11% return. Over the past 10 years, BRMKX has underperformed WFSPX with an annualized return of 11.53%, while WFSPX has yielded a comparatively higher 15.03% annualized return.
BRMKX
- 1D
- -0.28%
- 1M
- -0.65%
- 6M
- 10.51%
- YTD
- 14.65%
- 1Y
- 20.31%
- 3Y*
- 14.89%
- 5Y*
- 8.21%
- 10Y*
- 11.53%
- ALL TIME*
- 11.88%
WFSPX
- 1D
- 0.71%
- 1M
- 0.14%
- 6M
- 7.96%
- YTD
- 10.11%
- 1Y
- 21.43%
- 3Y*
- 19.37%
- 5Y*
- 12.81%
- 10Y*
- 15.03%
- ALL TIME*
- 16.27%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
BRMKX vs. WFSPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
BRMKX iShares Russell Mid-Cap Index Fund | 14.65% | 10.48% | 15.28% | 17.30% | -17.22% | 22.52% | 17.17% | 30.47% | -9.09% | 17.74% |
WFSPX iShares S&P 500 Index Fund Class K | 10.11% | 17.83% | 24.94% | 26.25% | -18.14% | 28.63% | 18.43% | 31.45% | -4.83% | 21.27% |
Correlation
The correlation between BRMKX and WFSPX is 0.76, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.76 |
Correlation (3Y) Balances recent behavior with more history. | 0.82 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.88 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.89 |
Correlation (All Time) Calculated using the full available price history since Jan 4, 2016 | 0.90 |
The correlation between BRMKX and WFSPX shifts across timeframes, from 0.76 (1 year) to 0.90 (all time), reflecting how their relationship changes across market environments.
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Return for Risk
BRMKX vs. WFSPX — Risk / Return Rank
BRMKX
WFSPX
BRMKX vs. WFSPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares Russell Mid-Cap Index Fund (BRMKX) 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.
| BRMKX | WFSPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.15 | ||
| Sortino ratioReturn per unit of downside risk | -0.11 | ||
| Omega ratioGain probability vs. loss probability | 1.24 | 1.27 | -0.03 |
| Calmar ratioReturn relative to maximum drawdown | 2.30 | 2.20 | +0.10 |
| Martin ratioReturn relative to average drawdown | 8.93 | 9.44 | -0.51 |
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Drawdowns
BRMKX vs. WFSPX - Drawdown Comparison
The maximum BRMKX drawdown since its inception was -40.20%, smaller than the maximum WFSPX drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for BRMKX and WFSPX.
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Drawdown Indicators
| BRMKX | WFSPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -40.20% | -58.21% | +18.01% |
Max Drawdown (1Y)Largest decline over 1 year | -8.17% | -8.90% | +0.73% |
Max Drawdown (3Y)Largest decline over 3 years | -21.07% | -18.74% | -2.33% |
Max Drawdown (5Y)Largest decline over 5 years | -26.04% | -24.51% | -1.53% |
Max Drawdown (10Y)Largest decline over 10 years | -40.20% | -33.74% | -6.46% |
Current DrawdownCurrent decline from peak | -0.95% | -1.41% | +0.46% |
Average DrawdownAverage peak-to-trough decline | -5.58% | -12.72% | +7.14% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.10% | 2.07% | +0.03% |
Volatility
BRMKX vs. WFSPX - Volatility Comparison
The current volatility for iShares Russell Mid-Cap Index Fund (BRMKX) is 2.45%, while iShares S&P 500 Index Fund Class K (WFSPX) has a volatility of 3.52%. This indicates that BRMKX 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.
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Volatility by Period
| BRMKX | WFSPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.45% | 3.52% | -1.07% |
Volatility (6M)Calculated over the trailing 6-month period | 10.22% | 10.11% | +0.11% |
Volatility (1Y)Calculated over the trailing 1-year period | 13.72% | 12.86% | +0.86% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 18.24% | 16.99% | +1.25% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 19.26% | 18.03% | +1.23% |
BRMKX vs. WFSPX - Expense Ratio Comparison
BRMKX has a 0.06% 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%.
Dividends
BRMKX vs. WFSPX - Dividend Comparison
BRMKX's dividend yield for the trailing twelve months is around 5.21%, more than WFSPX's 1.66% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BRMKX iShares Russell Mid-Cap Index Fund | 5.21% | 5.92% | 6.43% | 3.02% | 3.67% | 4.07% | 2.86% | 3.95% | 3.87% | 19.24% | 2.11% | 0.00% |
WFSPX iShares S&P 500 Index Fund Class K | 1.66% | 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
BRMKX and WFSPX have a correlation of 0.76, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
WFSPX has higher volatility (3.52%) compared to BRMKX (2.45%). In terms of maximum drawdown, BRMKX dropped -40.20% vs WFSPX's -58.21%.
WFSPX currently has the higher Sharpe Ratio (1.52 vs 1.37), 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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