RBFFX vs. SCOAX
RBFFX (American Funds The Bond Fund of America) and SCOAX (SEI Institutional Investments Trust Core Fixed Income Fund) are both Intermediate Core Bond funds. Over the past 10 years, RBFFX returned 1.99%/yr vs 1.89%/yr for SCOAX. Their correlation of 0.90 suggests significant overlap in exposure. RBFFX charges 0.29%/yr vs 0.36%/yr for SCOAX.
Performance
RBFFX vs. SCOAX - Performance Comparison
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Returns By Period
In the year-to-date period, RBFFX achieves a 0.13% return, which is significantly lower than SCOAX's 0.30% return. Over the past 10 years, RBFFX has outperformed SCOAX with an annualized return of 1.99%, while SCOAX has yielded a comparatively lower 1.89% annualized return.
RBFFX
- 1D
- 0.18%
- 1M
- 0.91%
- YTD
- 0.13%
- 6M
- 0.59%
- 1Y
- 4.60%
- 3Y*
- 4.01%
- 5Y*
- -0.00%
- 10Y*
- 1.99%
SCOAX
- 1D
- 0.23%
- 1M
- 0.82%
- YTD
- 0.30%
- 6M
- 0.65%
- 1Y
- 4.79%
- 3Y*
- 3.82%
- 5Y*
- -0.41%
- 10Y*
- 1.89%
RBFFX vs. SCOAX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
RBFFX American Funds The Bond Fund of America | 0.13% | 7.49% | 1.47% | 4.65% | -13.03% | -0.64% | 11.07% | 8.13% | 0.17% | 3.53% |
SCOAX SEI Institutional Investments Trust Core Fixed Income Fund | 0.30% | 7.56% | 0.82% | 5.44% | -14.84% | -1.49% | 9.49% | 9.59% | 0.11% | 5.07% |
Correlation
The correlation between RBFFX and SCOAX is 0.96 - 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 | 0.96 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.96 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.97 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.95 |
Correlation (All Time) Calculated using the full available price history since Jan 2, 2003 | 0.90 |
The correlation between RBFFX and SCOAX has been stable across timeframes, ranging from 0.90 to 0.97 - a consistent structural relationship.
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Return for Risk
RBFFX vs. SCOAX — Risk / Return Rank
RBFFX
SCOAX
RBFFX vs. SCOAX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for American Funds The Bond Fund of America (RBFFX) and SEI Institutional Investments Trust Core Fixed Income Fund (SCOAX). 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.
| RBFFX | SCOAX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.02 | ||
| Sortino ratioReturn per unit of downside risk | -0.03 | ||
| Omega ratioGain probability vs. loss probability | 1.21 | 1.22 | -0.01 |
| Calmar ratioReturn relative to maximum drawdown | 1.53 | 1.62 | -0.09 |
| Martin ratioReturn relative to average drawdown | 4.29 | 4.56 | -0.26 |
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Drawdowns
RBFFX vs. SCOAX - Drawdown Comparison
The maximum RBFFX drawdown since its inception was -17.62%, smaller than the maximum SCOAX drawdown of -20.12%. Use the drawdown chart below to compare losses from any high point for RBFFX and SCOAX.
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Drawdown Indicators
| RBFFX | SCOAX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -17.62% | -20.12% | +2.50% |
Max Drawdown (1Y)Largest decline over 1 year | -3.09% | -3.06% | -0.03% |
Max Drawdown (3Y)Largest decline over 3 years | -6.11% | -7.02% | +0.91% |
Max Drawdown (5Y)Largest decline over 5 years | -17.62% | -19.90% | +2.28% |
Max Drawdown (10Y)Largest decline over 10 years | -17.62% | -20.12% | +2.50% |
Current DrawdownCurrent decline from peak | -1.59% | -3.80% | +2.21% |
Average DrawdownAverage peak-to-trough decline | -2.81% | -5.46% | +2.65% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.09% | 1.08% | +0.01% |
Volatility
RBFFX vs. SCOAX - Volatility Comparison
American Funds The Bond Fund of America (RBFFX) and SEI Institutional Investments Trust Core Fixed Income Fund (SCOAX) have volatilities of 1.23% and 1.22%, 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
| RBFFX | SCOAX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.23% | 1.22% | +0.01% |
Volatility (6M)Calculated over the trailing 6-month period | 2.90% | 2.98% | -0.08% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.90% | 4.02% | -0.12% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.97% | 6.37% | -0.40% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.90% | 5.23% | -0.33% |
RBFFX vs. SCOAX - Expense Ratio Comparison
RBFFX has a 0.29% expense ratio, which is lower than SCOAX's 0.36% expense ratio.
Dividends
RBFFX vs. SCOAX - Dividend Comparison
RBFFX's dividend yield for the trailing twelve months is around 4.45%, more than SCOAX's 4.26% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
RBFFX American Funds The Bond Fund of America | 4.45% | 4.43% | 4.61% | 3.53% | 2.42% | 2.31% | 5.34% | 3.76% | 2.67% | 2.14% | 2.07% | 2.30% |
SCOAX SEI Institutional Investments Trust Core Fixed Income Fund | 4.26% | 4.19% | 3.57% | 2.98% | 2.11% | 1.69% | 6.04% | 4.24% | 3.16% | 3.67% | 3.79% | 4.73% |
Frequently Asked Questions
With a correlation of 0.96, RBFFX and SCOAX 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.
RBFFX has higher volatility (1.23%) compared to SCOAX (1.22%). In terms of maximum drawdown, RBFFX dropped -17.62% vs SCOAX's -20.12%.
SCOAX currently has the higher Sharpe Ratio (1.23 vs 1.21), 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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