ACCNX vs. MDVAX

Last updated Jun 6, 2026

ACCNX (American Century Core Plus Fund) and MDVAX (MassMutual Diversified Bond Fund) are both Intermediate Core-Plus Bond funds. Over the past 10 years, ACCNX returned 1.74%/yr vs 2.21%/yr for MDVAX. Their correlation of 0.87 suggests significant overlap in exposure. ACCNX charges 0.54%/yr vs 1.07%/yr for MDVAX.

Performance

ACCNX vs. MDVAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Core Plus Fund (ACCNX) and MassMutual Diversified Bond Fund (MDVAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ACCNX achieves a 0.54% return, which is significantly lower than MDVAX's 2.47% return. Over the past 10 years, ACCNX has underperformed MDVAX with an annualized return of 1.74%, while MDVAX has yielded a comparatively higher 2.21% annualized return.

ACCNX

• 1D: 0.22%
• 1M: -0.04%
• YTD: 0.54%
• 6M: 0.94%
• 1Y: 5.70%
• 3Y*: 4.45%
• 5Y*: -0.14%
• 10Y*: 1.74%

MDVAX

• 1D: 0.00%
• 1M: 0.37%
• YTD: 2.47%
• 6M: 2.82%
• 1Y: 7.91%
• 3Y*: 5.92%
• 5Y*: 0.30%
• 10Y*: 2.21%

*Multi-year figures are annualized to reflect compound growth (CAGR)

ACCNX vs. MDVAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ACCNX American Century Core Plus Fund	0.54%	7.45%	2.00%	5.64%	-15.80%	0.34%	8.00%	9.05%	-1.37%	4.59%
MDVAX MassMutual Diversified Bond Fund	2.47%	8.40%	2.47%	5.81%	-17.01%	1.95%	8.08%	10.12%	-1.55%	4.52%

Correlation

The correlation between ACCNX and MDVAX is 0.90, 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	0.90
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.89
Correlation (All Time) Calculated using the full available price history since Dec 4, 2006	0.87

The correlation between ACCNX and MDVAX has been stable across timeframes, ranging from 0.87 to 0.93 - a consistent structural relationship.

Return for Risk

ACCNX vs. MDVAX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

ACCNX

ACCNX Risk / Return Rank: 26
ACCNX Sharpe Ratio Rank: 26
ACCNX Sortino Ratio Rank: 27
ACCNX Omega Ratio Rank: 25
ACCNX Calmar Ratio Rank: 25
ACCNX Martin Ratio Rank: 25

MDVAX

MDVAX Risk / Return Rank: 79
MDVAX Sharpe Ratio Rank: 72
MDVAX Sortino Ratio Rank: 84
MDVAX Omega Ratio Rank: 76
MDVAX Calmar Ratio Rank: 80
MDVAX Martin Ratio Rank: 83

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

ACCNX vs. MDVAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Core Plus Fund (ACCNX) and MassMutual Diversified Bond Fund (MDVAX). 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.

	ACCNX	MDVAX	Difference
Sharpe ratio: Return per unit of total volatility	1.39	2.40	-1.01
Sortino ratio: Return per unit of downside risk	2.06	3.95	-1.88
Omega ratio: Gain probability vs. loss probability	1.25	1.48	-0.24
Calmar ratio: Return relative to maximum drawdown	1.78	3.53	-1.75
Martin ratio: Return relative to average drawdown	5.71	14.88	-9.17
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ACCNX vs. MDVAX - Sharpe Ratio Comparison

The current ACCNX Sharpe Ratio is 1.39, which is lower than the MDVAX Sharpe Ratio of 2.40. The chart below compares the historical Sharpe Ratios of ACCNX and MDVAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	ACCNX	MDVAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.39	2.40	-1.01
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.02	0.05	-0.07
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.35	0.42	-0.07
Sharpe Ratio (All Time) Calculated using the full available price history	0.74	0.71	+0.03

Drawdowns

ACCNX vs. MDVAX - Drawdown Comparison

The maximum ACCNX drawdown since its inception was -20.34%, smaller than the maximum MDVAX drawdown of -23.02%. Use the drawdown chart below to compare losses from any high point for ACCNX and MDVAX.

Drawdown Indicators

	ACCNX	MDVAX	Difference
Max Drawdown Largest peak-to-trough decline	-20.34%	-23.02%	+2.68%
Max Drawdown (1Y) Largest decline over 1 year	-3.09%	-2.21%	-0.88%
Max Drawdown (3Y) Largest decline over 3 years	-6.99%	-5.44%	-1.55%
Max Drawdown (5Y) Largest decline over 5 years	-20.34%	-23.02%	+2.68%
Max Drawdown (10Y) Largest decline over 10 years	-20.34%	-23.02%	+2.68%
Current Drawdown Current decline from peak	-2.75%	-3.49%	+0.74%
Average Drawdown Average peak-to-trough decline	-3.18%	-3.47%	+0.29%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.96%	0.52%	+0.44%

Volatility

ACCNX vs. MDVAX - Volatility Comparison

American Century Core Plus Fund (ACCNX) has a higher volatility of 1.45% compared to MassMutual Diversified Bond Fund (MDVAX) at 0.94%. This indicates that ACCNX's price experiences larger fluctuations and is considered to be riskier than MDVAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ACCNX	MDVAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.45%	0.94%	+0.51%
Volatility (6M) Calculated over the trailing 6-month period	2.93%	2.17%	+0.76%
Volatility (1Y) Calculated over the trailing 1-year period	3.98%	3.28%	+0.70%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.15%	6.46%	-0.31%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.03%	5.26%	-0.23%

ACCNX vs. MDVAX - Expense Ratio Comparison

ACCNX has a 0.54% expense ratio, which is lower than MDVAX's 1.07% expense ratio.

Dividends

ACCNX vs. MDVAX - Dividend Comparison

ACCNX's dividend yield for the trailing twelve months is around 4.70%, more than MDVAX's 3.99% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACCNX American Century Core Plus Fund	4.70%	4.74%	4.84%	4.21%	2.29%	3.18%	2.03%	2.75%	3.88%	2.99%	2.79%	2.93%
MDVAX MassMutual Diversified Bond Fund	3.99%	3.91%	2.45%	4.87%	3.76%	4.06%	7.20%	2.90%	2.86%	2.64%	2.11%	0.53%

Frequently Asked Questions

Can I hold both ACCNX and MDVAX in my portfolio?

With a correlation of 0.90, ACCNX and MDVAX 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.

Which is riskier, ACCNX or MDVAX?

ACCNX has higher volatility (1.45%) compared to MDVAX (0.94%). In terms of maximum drawdown, ACCNX dropped -20.34% vs MDVAX's -23.02%.

Which has better risk-adjusted returns?

MDVAX currently has the higher Sharpe Ratio (2.40 vs 1.39), 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.