RFAYX vs. WFBIX
RFAYX (Russell Investments Investment Grade Bond Fund) and WFBIX (iShares U.S. Aggregate Bond Index Fund) are both Intermediate Core Bond funds. Over the past 10 years, RFAYX returned 1.59%/yr vs 1.96%/yr for WFBIX. Their correlation of 0.93 suggests significant overlap in exposure. RFAYX charges 0.32%/yr vs 0.05%/yr for WFBIX.
Performance
RFAYX vs. WFBIX - Performance Comparison
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Returns By Period
In the year-to-date period, RFAYX achieves a 0.38% return, which is significantly lower than WFBIX's 0.43% return. Over the past 10 years, RFAYX has underperformed WFBIX with an annualized return of 1.59%, while WFBIX has yielded a comparatively higher 1.96% annualized return.
RFAYX
- 1D
- 0.07%
- 1M
- 0.52%
- YTD
- 0.38%
- 6M
- 0.29%
- 1Y
- 5.42%
- 3Y*
- 3.97%
- 5Y*
- -0.27%
- 10Y*
- 1.59%
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%
RFAYX vs. WFBIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
RFAYX Russell Investments Investment Grade Bond Fund | 0.38% | 7.47% | 1.57% | 4.85% | -14.80% | -1.09% | 9.10% | 9.03% | -0.56% | 3.57% |
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 RFAYX and WFBIX is 0.93, 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 | 0.93 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.94 |
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 Jan 3, 2001 | 0.93 |
The correlation between RFAYX and WFBIX has been stable across timeframes, ranging from 0.93 to 0.96 - a consistent structural relationship.
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Return for Risk
RFAYX vs. WFBIX — Risk / Return Rank
RFAYX
WFBIX
RFAYX vs. WFBIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Russell Investments Investment Grade Bond Fund (RFAYX) 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.
| RFAYX | WFBIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.13 | ||
| Sortino ratioReturn per unit of downside risk | +0.22 | ||
| Omega ratioGain probability vs. loss probability | 1.27 | 1.25 | +0.02 |
| Calmar ratioReturn relative to maximum drawdown | 1.99 | 1.78 | +0.21 |
| Martin ratioReturn relative to average drawdown | 5.96 | 5.34 | +0.62 |
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
| RFAYX | WFBIX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.49 | 1.36 | +0.13 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | -0.05 | 0.16 | -0.20 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.33 | 0.38 | -0.06 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.75 | 0.94 | -0.19 |
Drawdowns
RFAYX vs. WFBIX - Drawdown Comparison
The maximum RFAYX drawdown since its inception was -19.61%, roughly equal to the maximum WFBIX drawdown of -18.68%. Use the drawdown chart below to compare losses from any high point for RFAYX and WFBIX.
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Drawdown Indicators
| RFAYX | WFBIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -19.61% | -18.68% | -0.93% |
Max Drawdown (1Y)Largest decline over 1 year | -2.73% | -3.02% | +0.29% |
Max Drawdown (3Y)Largest decline over 3 years | -6.32% | -6.09% | -0.23% |
Max Drawdown (5Y)Largest decline over 5 years | -19.61% | -17.84% | -1.77% |
Max Drawdown (10Y)Largest decline over 10 years | -19.61% | -18.68% | -0.93% |
Current DrawdownCurrent decline from peak | -4.00% | -1.50% | -2.50% |
Average DrawdownAverage peak-to-trough decline | -2.98% | -2.26% | -0.72% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.91% | 1.00% | -0.09% |
Volatility
RFAYX vs. WFBIX - Volatility Comparison
Russell Investments Investment Grade Bond Fund (RFAYX) and iShares U.S. Aggregate Bond Index Fund (WFBIX) have volatilities of 1.29% and 1.34%, 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
| RFAYX | WFBIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.29% | 1.34% | -0.05% |
Volatility (6M)Calculated over the trailing 6-month period | 2.55% | 2.83% | -0.28% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.65% | 3.97% | -0.32% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.90% | 6.40% | -0.50% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.90% | 5.17% | -0.27% |
RFAYX vs. WFBIX - Expense Ratio Comparison
RFAYX has a 0.32% expense ratio, which is higher than WFBIX's 0.05% expense ratio.
Dividends
RFAYX vs. WFBIX - Dividend Comparison
RFAYX's dividend yield for the trailing twelve months is around 5.43%, more than WFBIX's 3.91% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
RFAYX Russell Investments Investment Grade Bond Fund | 5.43% | 5.19% | 4.74% | 3.71% | 1.25% | 2.50% | 5.27% | 3.46% | 2.67% | 1.57% | 5.45% | 4.09% |
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 0.93, RFAYX 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.
WFBIX has higher volatility (1.34%) compared to RFAYX (1.29%). In terms of maximum drawdown, RFAYX dropped -19.61% vs WFBIX's -18.68%.
RFAYX currently has the higher Sharpe Ratio (1.49 vs 1.36), 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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