SPMIX vs. WFSPX
SPMIX (Shelton Capital Management S&P Midcap Index Fund) and WFSPX (iShares S&P 500 Index Fund Class K) are both mutual funds - SPMIX 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, SPMIX returned 13.13%/yr vs 15.50%/yr for WFSPX. Their correlation of 0.86 suggests significant overlap in exposure. SPMIX charges 0.62%/yr vs 0.03%/yr for WFSPX.
Performance
SPMIX vs. WFSPX - Performance Comparison
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Returns By Period
In the year-to-date period, SPMIX achieves a 14.88% return, which is significantly higher than WFSPX's 8.09% return. Over the past 10 years, SPMIX has underperformed WFSPX with an annualized return of 13.13%, while WFSPX has yielded a comparatively higher 15.50% annualized return.
SPMIX
- 1D
- 0.61%
- 1M
- 1.79%
- YTD
- 14.88%
- 6M
- 12.60%
- 1Y
- 25.01%
- 3Y*
- 19.32%
- 5Y*
- 9.91%
- 10Y*
- 13.13%
WFSPX
- 1D
- -0.10%
- 1M
- -2.04%
- YTD
- 8.09%
- 6M
- 6.76%
- 1Y
- 22.17%
- 3Y*
- 20.73%
- 5Y*
- 13.01%
- 10Y*
- 15.50%
SPMIX vs. WFSPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SPMIX Shelton Capital Management S&P Midcap Index Fund | 14.88% | 6.72% | 24.42% | 15.96% | -13.18% | 23.73% | 12.97% | 34.63% | -11.34% | 15.74% |
WFSPX iShares S&P 500 Index Fund Class K | 8.09% | 17.83% | 24.94% | 26.25% | -18.14% | 28.63% | 18.43% | 31.45% | -4.83% | 21.27% |
Correlation
The correlation between SPMIX and WFSPX is 0.75, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.75 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.79 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.84 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.83 |
Correlation (All Time) Calculated using the full available price history since Jul 2, 1993 | 0.86 |
The correlation between SPMIX and WFSPX shifts across timeframes, from 0.75 (1 year) to 0.86 (all time), reflecting how their relationship changes across market environments.
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Return for Risk
SPMIX vs. WFSPX — Risk / Return Rank
SPMIX
WFSPX
SPMIX vs. WFSPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Shelton Capital Management S&P Midcap Index Fund (SPMIX) 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.
| SPMIX | WFSPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.25 | ||
| Sortino ratioReturn per unit of downside risk | -0.18 | ||
| Omega ratioGain probability vs. loss probability | 1.27 | 1.32 | -0.05 |
| Calmar ratioReturn relative to maximum drawdown | 2.71 | 2.50 | +0.21 |
| Martin ratioReturn relative to average drawdown | 9.90 | 11.18 | -1.28 |
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Drawdowns
SPMIX vs. WFSPX - Drawdown Comparison
The maximum SPMIX drawdown since its inception was -55.44%, roughly equal to the maximum WFSPX drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for SPMIX and WFSPX.
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Drawdown Indicators
| SPMIX | WFSPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.44% | -58.21% | +2.77% |
Max Drawdown (1Y)Largest decline over 1 year | -8.89% | -8.90% | +0.01% |
Max Drawdown (3Y)Largest decline over 3 years | -23.73% | -18.74% | -4.99% |
Max Drawdown (5Y)Largest decline over 5 years | -24.00% | -24.51% | +0.51% |
Max Drawdown (10Y)Largest decline over 10 years | -41.91% | -33.74% | -8.17% |
Current DrawdownCurrent decline from peak | -0.40% | -3.22% | +2.82% |
Average DrawdownAverage peak-to-trough decline | -7.25% | -12.75% | +5.50% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.43% | 1.99% | +0.44% |
Volatility
SPMIX vs. WFSPX - Volatility Comparison
Shelton Capital Management S&P Midcap Index Fund (SPMIX) and iShares S&P 500 Index Fund Class K (WFSPX) have volatilities of 4.69% and 4.88%, 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
| SPMIX | WFSPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.69% | 4.88% | -0.19% |
Volatility (6M)Calculated over the trailing 6-month period | 11.65% | 9.89% | +1.76% |
Volatility (1Y)Calculated over the trailing 1-year period | 15.72% | 12.53% | +3.19% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 20.14% | 16.98% | +3.16% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 21.30% | 18.04% | +3.26% |
SPMIX vs. WFSPX - Expense Ratio Comparison
SPMIX has a 0.62% expense ratio, which is higher than WFSPX's 0.03% expense ratio.
Dividends
SPMIX vs. WFSPX - Dividend Comparison
SPMIX's dividend yield for the trailing twelve months is around 4.96%, more than WFSPX's 1.62% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SPMIX Shelton Capital Management S&P Midcap Index Fund | 4.96% | 5.55% | 20.56% | 6.35% | 9.15% | 9.87% | 8.65% | 13.64% | 13.74% | 6.83% | 16.77% | 19.89% |
WFSPX iShares S&P 500 Index Fund Class K | 1.62% | 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
SPMIX and WFSPX have a correlation of 0.75, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
WFSPX has higher volatility (4.88%) compared to SPMIX (4.69%). In terms of maximum drawdown, SPMIX dropped -55.44% vs WFSPX's -58.21%.
WFSPX currently has the higher Sharpe Ratio (1.78 vs 1.54), 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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