ACBPX vs. VBMPX
ACBPX (American Century Diversified Bond Fund) and VBMPX (Vanguard Total Bond Market Index Fund Institutional Plus Shares) are both mutual funds - ACBPX is a Intermediate Core Bond fund managed by American Century, while VBMPX is a Total Bond Market fund tracking the Bloomberg U.S. Aggregate Float Adjusted Index. Over the past 10 years, ACBPX returned 1.13%/yr vs 1.30%/yr for VBMPX. Their 0.95 correlation means they have historically moved very closely together. ACBPX charges 0.39%/yr vs 0.02%/yr for VBMPX.
Performance
ACBPX vs. VBMPX - Performance Comparison
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Returns By Period
The year-to-date returns for both investments are quite close, with ACBPX having a -0.72% return and VBMPX slightly higher at -0.69%. Over the past 10 years, ACBPX has underperformed VBMPX with an annualized return of 1.13%, while VBMPX has yielded a comparatively higher 1.30% annualized return.
ACBPX
- 1D
- 0.00%
- 1M
- -1.31%
- 6M
- -1.00%
- YTD
- -0.72%
- 1Y
- 1.95%
- 3Y*
- 3.38%
- 5Y*
- -0.89%
- 10Y*
- 1.13%
- ALL TIME*
- 2.47%
VBMPX
- 1D
- 0.00%
- 1M
- -1.25%
- 6M
- -0.93%
- YTD
- -0.69%
- 1Y
- 1.68%
- 3Y*
- 3.70%
- 5Y*
- -0.43%
- 10Y*
- 1.30%
- ALL TIME*
- 2.23%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
ACBPX vs. VBMPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
ACBPX American Century Diversified Bond Fund | -0.72% | 7.42% | 0.80% | 4.66% | -14.28% | -0.65% | 8.26% | 8.59% | -1.25% | 3.49% |
VBMPX Vanguard Total Bond Market Index Fund Institutional Plus Shares | -0.69% | 7.18% | 1.27% | 5.75% | -13.14% | -1.95% | 7.75% | 8.74% | -0.24% | 3.58% |
Correlation
The correlation between ACBPX and VBMPX is 0.94, meaning they have usually moved in the same direction, including during past declines.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.94 |
Correlation (3Y) Balances recent behavior with more history. | 0.96 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.97 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.96 |
Correlation (All Time) Calculated using the full available price history since Feb 5, 2010 | 0.95 |
The correlation between ACBPX and VBMPX has been stable across timeframes, ranging from 0.94 to 0.97 - a consistent structural relationship.
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Return for Risk
ACBPX vs. VBMPX — Risk / Return Rank
ACBPX
VBMPX
ACBPX vs. VBMPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for American Century Diversified Bond Fund (ACBPX) and Vanguard Total Bond Market Index Fund Institutional Plus Shares (VBMPX). 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.
| ACBPX | VBMPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.10 | ||
| Sortino ratioReturn per unit of downside risk | +0.16 | ||
| Omega ratioGain probability vs. loss probability | 1.15 | 1.13 | +0.02 |
| Calmar ratioReturn relative to maximum drawdown | 1.11 | 1.00 | +0.11 |
| Martin ratioReturn relative to average drawdown | 2.76 | 2.50 | +0.26 |
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Drawdowns
ACBPX vs. VBMPX - Drawdown Comparison
The maximum ACBPX drawdown since its inception was -18.99%, roughly equal to the maximum VBMPX drawdown of -18.90%. Use the drawdown chart below to compare losses from any high point for ACBPX and VBMPX.
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Drawdown Indicators
| ACBPX | VBMPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.99% | -18.90% | -0.09% |
Max Drawdown (1Y)Largest decline over 1 year | -2.93% | -2.89% | -0.04% |
Max Drawdown (3Y)Largest decline over 3 years | -5.77% | -4.86% | -0.91% |
Max Drawdown (5Y)Largest decline over 5 years | -18.99% | -18.12% | -0.87% |
Max Drawdown (10Y)Largest decline over 10 years | -18.99% | -18.90% | -0.09% |
Current DrawdownCurrent decline from peak | -4.58% | -3.33% | -1.25% |
Average DrawdownAverage peak-to-trough decline | -3.37% | -3.52% | +0.15% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.17% | 1.15% | +0.02% |
Volatility
ACBPX vs. VBMPX - Volatility Comparison
The current volatility for American Century Diversified Bond Fund (ACBPX) is 0.90%, while Vanguard Total Bond Market Index Fund Institutional Plus Shares (VBMPX) has a volatility of 0.96%. This indicates that ACBPX experiences smaller price fluctuations and is considered to be less risky than VBMPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| ACBPX | VBMPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.90% | 0.96% | -0.06% |
Volatility (6M)Calculated over the trailing 6-month period | 3.03% | 2.97% | +0.06% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.83% | 3.83% | 0.00% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.14% | 6.02% | +0.12% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.04% | 4.98% | +0.06% |
ACBPX vs. VBMPX - Expense Ratio Comparison
ACBPX has a 0.39% expense ratio, which is higher than VBMPX's 0.02% expense ratio.
Dividends
ACBPX vs. VBMPX - Dividend Comparison
ACBPX's dividend yield for the trailing twelve months is around 4.23%, more than VBMPX's 3.73% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ACBPX American Century Diversified Bond Fund | 4.23% | 4.60% | 3.89% | 3.32% | 2.07% | 2.60% | 4.57% | 2.48% | 2.83% | 2.30% | 2.63% | 2.88% |
VBMPX Vanguard Total Bond Market Index Fund Institutional Plus Shares | 3.73% | 3.88% | 3.69% | 3.11% | 2.61% | 1.81% | 2.41% | 2.75% | 2.58% | 2.58% | 2.55% | 2.85% |
Frequently Asked Questions
With a correlation of 0.94, ACBPX and VBMPX 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.
VBMPX has higher volatility (0.96%) compared to ACBPX (0.90%). In terms of maximum drawdown, ACBPX dropped -18.99% vs VBMPX's -18.90%.
ACBPX currently has the higher Sharpe Ratio (0.85 vs 0.76), 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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