CMPIX vs. WFBIX
CMPIX (Principal Core Fixed Income) and WFBIX (iShares U.S. Aggregate Bond Index Fund) are both Intermediate Core Bond funds. Over the past 10 years, CMPIX returned 1.68%/yr vs 1.96%/yr for WFBIX. Their correlation of 0.88 suggests significant overlap in exposure. CMPIX charges 0.74%/yr vs 0.05%/yr for WFBIX.
Performance
CMPIX vs. WFBIX - Performance Comparison
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Returns By Period
In the year-to-date period, CMPIX achieves a 0.26% return, which is significantly lower than WFBIX's 0.43% return. Over the past 10 years, CMPIX has underperformed WFBIX with an annualized return of 1.68%, while WFBIX has yielded a comparatively higher 1.96% annualized return.
CMPIX
- 1D
- 0.00%
- 1M
- 0.53%
- YTD
- 0.26%
- 6M
- 0.10%
- 1Y
- 5.06%
- 3Y*
- 3.68%
- 5Y*
- -0.19%
- 10Y*
- 1.68%
WFBIX
- 1D
- 0.00%
- 1M
- 0.45%
- YTD
- 0.43%
- 6M
- 0.32%
- 1Y
- 5.35%
- 3Y*
- 5.33%
- 5Y*
- 0.99%
- 10Y*
- 1.96%
CMPIX vs. WFBIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
CMPIX Principal Core Fixed Income | 0.26% | 6.76% | 1.26% | 4.89% | -13.34% | -2.03% | 7.84% | 8.59% | -0.24% | 4.16% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 0.43% | 7.16% | 1.43% | 9.65% | -13.03% | -1.79% | 7.40% | 8.72% | -0.08% | 3.39% |
Correlation
The correlation between CMPIX and WFBIX is 0.95, 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 | 0.95 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.95 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.96 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.93 |
Correlation (All Time) Calculated using the full available price history since Jun 21, 1996 | 0.88 |
The correlation between CMPIX and WFBIX has been stable across timeframes, ranging from 0.88 to 0.96 - a consistent structural relationship.
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Return for Risk
CMPIX vs. WFBIX — Risk / Return Rank
CMPIX
WFBIX
CMPIX vs. WFBIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Principal Core Fixed Income (CMPIX) and iShares U.S. Aggregate Bond Index Fund (WFBIX). 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.
| CMPIX | WFBIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.07 | ||
| Sortino ratioReturn per unit of downside risk | -0.15 | ||
| Omega ratioGain probability vs. loss probability | 1.23 | 1.25 | -0.01 |
| Calmar ratioReturn relative to maximum drawdown | 1.71 | 1.78 | -0.07 |
| Martin ratioReturn relative to average drawdown | 5.17 | 5.34 | -0.17 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| CMPIX | WFBIX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.29 | 1.36 | -0.07 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | -0.03 | 0.16 | -0.19 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.35 | 0.38 | -0.03 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.98 | 0.94 | +0.04 |
Drawdowns
CMPIX vs. WFBIX - Drawdown Comparison
The maximum CMPIX drawdown since its inception was -18.80%, roughly equal to the maximum WFBIX drawdown of -18.68%. Use the drawdown chart below to compare losses from any high point for CMPIX and WFBIX.
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Drawdown Indicators
| CMPIX | WFBIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.80% | -18.68% | -0.12% |
Max Drawdown (1Y)Largest decline over 1 year | -2.97% | -3.02% | +0.05% |
Max Drawdown (3Y)Largest decline over 3 years | -6.58% | -6.09% | -0.49% |
Max Drawdown (5Y)Largest decline over 5 years | -18.51% | -17.84% | -0.67% |
Max Drawdown (10Y)Largest decline over 10 years | -18.80% | -18.68% | -0.12% |
Current DrawdownCurrent decline from peak | -3.49% | -1.50% | -1.99% |
Average DrawdownAverage peak-to-trough decline | -2.48% | -2.26% | -0.22% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.98% | 1.00% | -0.02% |
Volatility
CMPIX vs. WFBIX - Volatility Comparison
Principal Core Fixed Income (CMPIX) has a higher volatility of 1.42% compared to iShares U.S. Aggregate Bond Index Fund (WFBIX) at 1.34%. This indicates that CMPIX's price experiences larger fluctuations and is considered to be riskier than WFBIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| CMPIX | WFBIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.42% | 1.34% | +0.08% |
Volatility (6M)Calculated over the trailing 6-month period | 2.93% | 2.83% | +0.10% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.96% | 3.97% | -0.01% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.81% | 6.40% | -0.59% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.82% | 5.17% | -0.35% |
CMPIX vs. WFBIX - Expense Ratio Comparison
CMPIX has a 0.74% expense ratio, which is higher than WFBIX's 0.05% expense ratio.
Dividends
CMPIX vs. WFBIX - Dividend Comparison
CMPIX's dividend yield for the trailing twelve months is around 3.43%, less than WFBIX's 3.91% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
CMPIX Principal Core Fixed Income | 3.43% | 3.35% | 3.27% | 2.37% | 2.10% | 1.94% | 2.11% | 2.71% | 3.19% | 2.91% | 3.17% | 3.29% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 3.91% | 3.78% | 3.68% | 6.82% | 2.60% | 2.04% | 2.43% | 2.88% | 2.71% | 2.24% | 2.25% | 2.20% |
Frequently Asked Questions
With a correlation of 0.95, CMPIX and WFBIX 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.
CMPIX has higher volatility (1.42%) compared to WFBIX (1.34%). In terms of maximum drawdown, CMPIX dropped -18.80% vs WFBIX's -18.68%.
WFBIX currently has the higher Sharpe Ratio (1.36 vs 1.29), 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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