MCBDX vs. RBFFX
MCBDX (MassMutual Core Bond Fund) and RBFFX (American Funds The Bond Fund of America) are both Intermediate Core Bond funds. Over the past 10 years, MCBDX returned 5.31%/yr vs 1.91%/yr for RBFFX. Their correlation of 0.88 suggests significant overlap in exposure. MCBDX charges 0.52%/yr vs 0.29%/yr for RBFFX.
Performance
MCBDX vs. RBFFX - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, MCBDX achieves a 0.63% return, which is significantly higher than RBFFX's -0.22% return. Over the past 10 years, MCBDX has outperformed RBFFX with an annualized return of 5.31%, while RBFFX has yielded a comparatively lower 1.91% annualized return.
MCBDX
- 1D
- -0.33%
- 1M
- 0.68%
- YTD
- 0.63%
- 6M
- 1.13%
- 1Y
- 5.60%
- 3Y*
- 4.71%
- 5Y*
- 6.55%
- 10Y*
- 5.31%
RBFFX
- 1D
- -0.36%
- 1M
- 0.56%
- YTD
- -0.22%
- 6M
- 0.23%
- 1Y
- 3.95%
- 3Y*
- 3.89%
- 5Y*
- -0.01%
- 10Y*
- 1.91%
MCBDX vs. RBFFX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
MCBDX MassMutual Core Bond Fund | 0.63% | 8.03% | 1.13% | 6.64% | -15.29% | 38.26% | 8.42% | 9.62% | -0.48% | 4.60% |
RBFFX American Funds The Bond Fund of America | -0.22% | 7.49% | 1.47% | 4.65% | -13.03% | -0.64% | 11.07% | 8.13% | 0.17% | 3.53% |
Correlation
The correlation between MCBDX and RBFFX 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 | 0.94 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.94 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.92 |
Correlation (All Time) Calculated using the full available price history since Jan 2, 2003 | 0.88 |
The correlation between MCBDX and RBFFX has been stable across timeframes, ranging from 0.88 to 0.95 - 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
MCBDX vs. RBFFX — Risk / Return Rank
MCBDX
RBFFX
MCBDX vs. RBFFX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for MassMutual Core Bond Fund (MCBDX) and American Funds The Bond Fund of America (RBFFX). 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.
| MCBDX | RBFFX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.45 | ||
| Sortino ratioReturn per unit of downside risk | +0.69 | ||
| Omega ratioGain probability vs. loss probability | 1.28 | 1.19 | +0.09 |
| Calmar ratioReturn relative to maximum drawdown | 2.04 | 1.37 | +0.66 |
| Martin ratioReturn relative to average drawdown | 6.65 | 3.84 | +2.80 |
Loading charts...
Drawdowns
MCBDX vs. RBFFX - Drawdown Comparison
The maximum MCBDX drawdown since its inception was -22.01%, which is greater than RBFFX's maximum drawdown of -17.62%. Use the drawdown chart below to compare losses from any high point for MCBDX and RBFFX.
Loading charts...
Drawdown Indicators
| MCBDX | RBFFX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -22.01% | -17.62% | -4.39% |
Max Drawdown (1Y)Largest decline over 1 year | -2.87% | -3.09% | +0.22% |
Max Drawdown (3Y)Largest decline over 3 years | -5.34% | -6.11% | +0.77% |
Max Drawdown (5Y)Largest decline over 5 years | -22.01% | -17.62% | -4.39% |
Max Drawdown (10Y)Largest decline over 10 years | -22.01% | -17.62% | -4.39% |
Current DrawdownCurrent decline from peak | -4.36% | -1.94% | -2.42% |
Average DrawdownAverage peak-to-trough decline | -3.53% | -2.81% | -0.72% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.88% | 1.10% | -0.22% |
Volatility
MCBDX vs. RBFFX - Volatility Comparison
The current volatility for MassMutual Core Bond Fund (MCBDX) is 1.06%, while American Funds The Bond Fund of America (RBFFX) has a volatility of 1.20%. This indicates that MCBDX experiences smaller price fluctuations and is considered to be less risky than RBFFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| MCBDX | RBFFX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.06% | 1.20% | -0.14% |
Volatility (6M)Calculated over the trailing 6-month period | 2.84% | 2.93% | -0.09% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.83% | 3.93% | -0.10% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 20.11% | 5.98% | +14.13% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 14.45% | 4.91% | +9.54% |
MCBDX vs. RBFFX - Expense Ratio Comparison
MCBDX has a 0.52% expense ratio, which is higher than RBFFX's 0.29% expense ratio.
Dividends
MCBDX vs. RBFFX - Dividend Comparison
MCBDX's dividend yield for the trailing twelve months is around 4.48%, which matches RBFFX's 4.47% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MCBDX MassMutual Core Bond Fund | 4.48% | 4.50% | 1.93% | 4.62% | 3.83% | 31.12% | 5.98% | 3.35% | 3.32% | 2.96% | 3.29% | 1.43% |
RBFFX American Funds The Bond Fund of America | 4.47% | 4.43% | 4.61% | 3.53% | 2.42% | 2.31% | 5.34% | 3.76% | 2.67% | 2.14% | 2.07% | 2.30% |
Frequently Asked Questions
With a correlation of 0.95, MCBDX and RBFFX 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 (1.20%) compared to MCBDX (1.06%). In terms of maximum drawdown, MCBDX dropped -22.01% vs RBFFX's -17.62%.
MCBDX currently has the higher Sharpe Ratio (1.53 vs 1.08), 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 MCBDX and RBFFX
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