WFBIX vs. CFBNX
WFBIX (iShares U.S. Aggregate Bond Index Fund) and CFBNX (Commerce Bond Fund) are both Intermediate Core Bond funds. Over the past 10 years, WFBIX returned 1.87%/yr vs 1.86%/yr for CFBNX. Their correlation of 0.91 suggests significant overlap in exposure. WFBIX charges 0.05%/yr vs 0.60%/yr for CFBNX.
Performance
WFBIX vs. CFBNX - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, WFBIX achieves a 0.10% return, which is significantly lower than CFBNX's 0.13% return. Both investments have delivered pretty close results over the past 10 years, with WFBIX having a 1.87% annualized return and CFBNX not far behind at 1.86%.
WFBIX
- 1D
- -0.33%
- 1M
- 0.56%
- YTD
- 0.10%
- 6M
- 0.42%
- 1Y
- 4.19%
- 3Y*
- 5.22%
- 5Y*
- 0.77%
- 10Y*
- 1.87%
CFBNX
- 1D
- -0.28%
- 1M
- 0.59%
- YTD
- 0.13%
- 6M
- 0.44%
- 1Y
- 4.30%
- 3Y*
- 4.01%
- 5Y*
- 0.07%
- 10Y*
- 1.86%
WFBIX vs. CFBNX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
WFBIX iShares U.S. Aggregate Bond Index Fund | 0.10% | 7.16% | 1.43% | 9.65% | -13.03% | -1.79% | 7.40% | 8.72% | -0.08% | 3.39% |
CFBNX Commerce Bond Fund | 0.13% | 7.12% | 1.52% | 5.97% | -13.30% | -0.56% | 7.15% | 8.97% | -0.58% | 4.55% |
Correlation
The correlation between WFBIX and CFBNX is 0.97 - 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 | 0.97 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.96 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.95 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.93 |
Correlation (All Time) Calculated using the full available price history since Dec 12, 1994 | 0.91 |
The correlation between WFBIX and CFBNX has been stable across timeframes, ranging from 0.91 to 0.97 - a consistent structural relationship.
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
WFBIX vs. CFBNX — Risk / Return Rank
WFBIX
CFBNX
WFBIX vs. CFBNX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares U.S. Aggregate Bond Index Fund (WFBIX) and Commerce Bond Fund (CFBNX). 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.
| WFBIX | CFBNX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.06 | ||
| Sortino ratioReturn per unit of downside risk | -0.08 | ||
| Omega ratioGain probability vs. loss probability | 1.20 | 1.21 | -0.01 |
| Calmar ratioReturn relative to maximum drawdown | 1.47 | 1.53 | -0.06 |
| Martin ratioReturn relative to average drawdown | 4.11 | 4.24 | -0.13 |
Loading charts...
Drawdowns
WFBIX vs. CFBNX - Drawdown Comparison
The maximum WFBIX drawdown since its inception was -18.68%, roughly equal to the maximum CFBNX drawdown of -17.90%. Use the drawdown chart below to compare losses from any high point for WFBIX and CFBNX.
Loading charts...
Drawdown Indicators
| WFBIX | CFBNX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.68% | -17.90% | -0.78% |
Max Drawdown (1Y)Largest decline over 1 year | -3.02% | -2.98% | -0.04% |
Max Drawdown (3Y)Largest decline over 3 years | -6.09% | -5.72% | -0.37% |
Max Drawdown (5Y)Largest decline over 5 years | -17.84% | -17.90% | +0.06% |
Max Drawdown (10Y)Largest decline over 10 years | -18.68% | -17.90% | -0.78% |
Current DrawdownCurrent decline from peak | -1.82% | -1.75% | -0.07% |
Average DrawdownAverage peak-to-trough decline | -2.26% | -2.11% | -0.15% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.08% | 1.07% | +0.01% |
Volatility
WFBIX vs. CFBNX - Volatility Comparison
iShares U.S. Aggregate Bond Index Fund (WFBIX) and Commerce Bond Fund (CFBNX) have volatilities of 1.17% and 1.15%, 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.
Loading charts...
Volatility by Period
| WFBIX | CFBNX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.17% | 1.15% | +0.02% |
Volatility (6M)Calculated over the trailing 6-month period | 2.89% | 2.86% | +0.03% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.93% | 3.84% | +0.09% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.41% | 5.57% | +0.84% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.18% | 4.71% | +0.47% |
WFBIX vs. CFBNX - Expense Ratio Comparison
WFBIX has a 0.05% expense ratio, which is lower than CFBNX's 0.60% expense ratio.
Dividends
WFBIX vs. CFBNX - Dividend Comparison
WFBIX's dividend yield for the trailing twelve months is around 3.92%, more than CFBNX's 3.63% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
CFBNX Commerce Bond Fund | 3.63% | 3.54% | 2.94% | 2.67% | 2.40% | 3.02% | 2.71% | 3.14% | 3.25% | 3.23% | 3.40% | 3.52% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 3.92% | 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 0.97, WFBIX and CFBNX 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.
WFBIX has higher volatility (1.17%) compared to CFBNX (1.15%). In terms of maximum drawdown, WFBIX dropped -18.68% vs CFBNX's -17.90%.
CFBNX currently has the higher Sharpe Ratio (1.19 vs 1.13), 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.
Find the right allocation for WFBIX and CFBNX
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer