AMUSX vs. RFBAX

Last updated Jun 4, 2026

AMUSX (American Funds U.S. Government Securities Fund) and RFBAX (Davis Government Bond Fund) are both Government Bonds funds. Over the past 10 years, AMUSX returned 1.14%/yr vs 1.08%/yr for RFBAX. A 0.65 correlation means they provide meaningful diversification when combined. AMUSX charges 0.61%/yr vs 1.00%/yr for RFBAX.

Performance

AMUSX vs. RFBAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds U.S. Government Securities Fund (AMUSX) and Davis Government Bond Fund (RFBAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AMUSX achieves a -0.35% return, which is significantly lower than RFBAX's 0.88% return. Over the past 10 years, AMUSX has outperformed RFBAX with an annualized return of 1.14%, while RFBAX has yielded a comparatively lower 1.08% annualized return.

AMUSX

• 1D: 0.00%
• 1M: 0.28%
• YTD: -0.35%
• 6M: -0.26%
• 1Y: 4.29%
• 3Y*: 3.14%
• 5Y*: -0.13%
• 10Y*: 1.14%

RFBAX

• 1D: 0.00%
• 1M: 0.06%
• YTD: 0.88%
• 6M: 1.15%
• 1Y: 3.48%
• 3Y*: 3.97%
• 5Y*: 1.31%
• 10Y*: 1.08%

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

AMUSX vs. RFBAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AMUSX American Funds U.S. Government Securities Fund	-0.35%	7.55%	0.63%	2.79%	-11.50%	-0.84%	9.44%	5.03%	0.64%	1.54%
RFBAX Davis Government Bond Fund	0.88%	4.49%	4.33%	3.63%	-5.29%	-1.48%	1.69%	3.23%	0.42%	0.21%

Correlation

The correlation between AMUSX and RFBAX is 0.57, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.57
Correlation (3Y) Calculated over the trailing 3-year period	0.59
Correlation (5Y) Calculated over the trailing 5-year period	0.64
Correlation (10Y) Calculated over the trailing 10-year period	0.57
Correlation (All Time) Calculated using the full available price history since Jan 4, 1995	0.65

The correlation between AMUSX and RFBAX has been stable across timeframes, ranging from 0.56 to 0.65 - a consistent structural relationship.

Return for Risk

AMUSX vs. RFBAX — Risk / Return Rank

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

AMUSX

AMUSX Risk / Return Rank: 14
AMUSX Sharpe Ratio Rank: 14
AMUSX Sortino Ratio Rank: 15
AMUSX Omega Ratio Rank: 14
AMUSX Calmar Ratio Rank: 13
AMUSX Martin Ratio Rank: 14

RFBAX

RFBAX Risk / Return Rank: 69
RFBAX Sharpe Ratio Rank: 40
RFBAX Sortino Ratio Rank: 51
RFBAX Omega Ratio Rank: 77
RFBAX Calmar Ratio Rank: 89
RFBAX Martin Ratio Rank: 89

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.

AMUSX vs. RFBAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds U.S. Government Securities Fund (AMUSX) and Davis Government Bond Fund (RFBAX). 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.

	AMUSX	RFBAX	Difference
Sharpe ratio: Return per unit of total volatility	1.04	1.86	-0.82
Sortino ratio: Return per unit of downside risk	1.58	3.01	-1.43
Omega ratio: Gain probability vs. loss probability	1.19	1.51	-0.32
Calmar ratio: Return relative to maximum drawdown	1.26	4.53	-3.27
Martin ratio: Return relative to average drawdown	3.97	17.94	-13.98
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AMUSX vs. RFBAX - Sharpe Ratio Comparison

The current AMUSX Sharpe Ratio is 1.04, which is lower than the RFBAX Sharpe Ratio of 1.86. The chart below compares the historical Sharpe Ratios of AMUSX and RFBAX, 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

	AMUSX	RFBAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.04	1.86	-0.82
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.02	0.62	-0.65
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.24	0.61	-0.37
Sharpe Ratio (All Time) Calculated using the full available price history	0.83	1.05	-0.21

Drawdowns

AMUSX vs. RFBAX - Drawdown Comparison

The maximum AMUSX drawdown since its inception was -17.48%, which is greater than RFBAX's maximum drawdown of -8.03%. Use the drawdown chart below to compare losses from any high point for AMUSX and RFBAX.

Drawdown Indicators

	AMUSX	RFBAX	Difference
Max Drawdown Largest peak-to-trough decline	-17.48%	-8.03%	-9.45%
Max Drawdown (1Y) Largest decline over 1 year	-3.35%	-0.77%	-2.58%
Max Drawdown (3Y) Largest decline over 3 years	-6.50%	-0.88%	-5.62%
Max Drawdown (5Y) Largest decline over 5 years	-16.84%	-7.61%	-9.23%
Max Drawdown (10Y) Largest decline over 10 years	-17.48%	-8.03%	-9.45%
Current Drawdown Current decline from peak	-3.24%	-0.19%	-3.05%
Average Drawdown Average peak-to-trough decline	-2.75%	-1.18%	-1.57%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.06%	0.19%	+0.87%

Volatility

AMUSX vs. RFBAX - Volatility Comparison

American Funds U.S. Government Securities Fund (AMUSX) has a higher volatility of 1.54% compared to Davis Government Bond Fund (RFBAX) at 0.59%. This indicates that AMUSX's price experiences larger fluctuations and is considered to be riskier than RFBAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AMUSX	RFBAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.54%	0.59%	+0.95%
Volatility (6M) Calculated over the trailing 6-month period	2.85%	1.26%	+1.59%
Volatility (1Y) Calculated over the trailing 1-year period	4.06%	1.89%	+2.17%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.06%	2.10%	+3.96%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.86%	1.79%	+3.07%

AMUSX vs. RFBAX - Expense Ratio Comparison

AMUSX has a 0.61% expense ratio, which is lower than RFBAX's 1.00% expense ratio.

Dividends

AMUSX vs. RFBAX - Dividend Comparison

AMUSX's dividend yield for the trailing twelve months is around 4.00%, more than RFBAX's 3.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AMUSX American Funds U.S. Government Securities Fund	4.00%	3.97%	4.19%	3.44%	2.01%	1.05%	4.92%	2.79%	1.72%	1.32%	2.30%	2.84%
RFBAX Davis Government Bond Fund	3.04%	3.01%	3.23%	2.15%	0.80%	0.57%	0.93%	1.67%	1.17%	0.59%	0.68%	0.75%

Frequently Asked Questions

Can I hold both AMUSX and RFBAX in my portfolio?

AMUSX and RFBAX have a correlation of 0.57, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, AMUSX or RFBAX?

AMUSX has higher volatility (1.54%) compared to RFBAX (0.59%). In terms of maximum drawdown, AMUSX dropped -17.48% vs RFBAX's -8.03%.

Which has better risk-adjusted returns?

RFBAX currently has the higher Sharpe Ratio (1.86 vs 1.04), 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.