AMUSX vs. PRGMX

Last updated Jun 4, 2026

AMUSX (American Funds U.S. Government Securities Fund) and PRGMX (T. Rowe Price GNMA Fund) are both Government Bonds funds. Over the past 10 years, AMUSX returned 1.14%/yr vs 1.31%/yr for PRGMX. A 0.78 correlation means they provide meaningful diversification when combined. AMUSX charges 0.61%/yr vs 0.58%/yr for PRGMX.

Performance

AMUSX vs. PRGMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds U.S. Government Securities Fund (AMUSX) and T. Rowe Price GNMA Fund (PRGMX). 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 PRGMX's 0.93% return. Over the past 10 years, AMUSX has underperformed PRGMX with an annualized return of 1.14%, while PRGMX has yielded a comparatively higher 1.31% 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%

PRGMX

• 1D: 0.00%
• 1M: 0.56%
• YTD: 0.93%
• 6M: 1.33%
• 1Y: 7.89%
• 3Y*: 4.84%
• 5Y*: 0.69%
• 10Y*: 1.31%

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

AMUSX vs. PRGMX - 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%
PRGMX T. Rowe Price GNMA Fund	0.93%	8.72%	1.86%	5.62%	-11.45%	-2.18%	4.21%	5.18%	0.58%	1.23%

Correlation

The correlation between AMUSX and PRGMX is 0.87, 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	0.87
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (10Y) Calculated over the trailing 10-year period	0.83
Correlation (All Time) Calculated using the full available price history since Jan 3, 1986	0.78

The correlation between AMUSX and PRGMX shifts across timeframes, from 0.78 (all time) to 0.91 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

AMUSX vs. PRGMX — 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

PRGMX

PRGMX Risk / Return Rank: 44
PRGMX Sharpe Ratio Rank: 42
PRGMX Sortino Ratio Rank: 46
PRGMX Omega Ratio Rank: 43
PRGMX Calmar Ratio Rank: 48
PRGMX Martin Ratio Rank: 41

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. PRGMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds U.S. Government Securities Fund (AMUSX) and T. Rowe Price GNMA Fund (PRGMX). 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	PRGMX	Difference
Sharpe ratio: Return per unit of total volatility	1.04	1.89	-0.85
Sortino ratio: Return per unit of downside risk	1.58	2.86	-1.28
Omega ratio: Gain probability vs. loss probability	1.19	1.36	-0.17
Calmar ratio: Return relative to maximum drawdown	1.26	2.64	-1.38
Martin ratio: Return relative to average drawdown	3.97	8.88	-4.92
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. PRGMX - Sharpe Ratio Comparison

The current AMUSX Sharpe Ratio is 1.04, which is lower than the PRGMX Sharpe Ratio of 1.89. The chart below compares the historical Sharpe Ratios of AMUSX and PRGMX, 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	PRGMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.04	1.89	-0.85
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.02	0.11	-0.13
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.24	0.28	-0.04
Sharpe Ratio (All Time) Calculated using the full available price history	0.83	0.93	-0.10

Drawdowns

AMUSX vs. PRGMX - Drawdown Comparison

The maximum AMUSX drawdown since its inception was -17.48%, roughly equal to the maximum PRGMX drawdown of -18.22%. Use the drawdown chart below to compare losses from any high point for AMUSX and PRGMX.

Drawdown Indicators

	AMUSX	PRGMX	Difference
Max Drawdown Largest peak-to-trough decline	-17.48%	-18.22%	+0.74%
Max Drawdown (1Y) Largest decline over 1 year	-3.35%	-3.00%	-0.35%
Max Drawdown (3Y) Largest decline over 3 years	-6.50%	-7.14%	+0.64%
Max Drawdown (5Y) Largest decline over 5 years	-16.84%	-17.30%	+0.46%
Max Drawdown (10Y) Largest decline over 10 years	-17.48%	-18.22%	+0.74%
Current Drawdown Current decline from peak	-3.24%	-1.25%	-1.99%
Average Drawdown Average peak-to-trough decline	-2.75%	-2.24%	-0.51%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.06%	0.89%	+0.17%

Volatility

AMUSX vs. PRGMX - Volatility Comparison

The current volatility for American Funds U.S. Government Securities Fund (AMUSX) is 1.54%, while T. Rowe Price GNMA Fund (PRGMX) has a volatility of 1.72%. This indicates that AMUSX experiences smaller price fluctuations and is considered to be less risky than PRGMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AMUSX	PRGMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.54%	1.72%	-0.18%
Volatility (6M) Calculated over the trailing 6-month period	2.85%	3.11%	-0.26%
Volatility (1Y) Calculated over the trailing 1-year period	4.06%	4.20%	-0.14%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.06%	6.38%	-0.32%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.86%	4.77%	+0.09%

AMUSX vs. PRGMX - Expense Ratio Comparison

AMUSX has a 0.61% expense ratio, which is higher than PRGMX's 0.58% expense ratio.

Dividends

AMUSX vs. PRGMX - Dividend Comparison

AMUSX's dividend yield for the trailing twelve months is around 4.00%, less than PRGMX's 4.99% 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%
PRGMX T. Rowe Price GNMA Fund	4.99%	4.96%	4.47%	3.54%	1.38%	0.59%	1.44%	2.39%	2.78%	2.98%	2.88%	3.12%

Frequently Asked Questions

Can I hold both AMUSX and PRGMX in my portfolio?

AMUSX and PRGMX have a correlation of 0.87, 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 PRGMX?

PRGMX has higher volatility (1.72%) compared to AMUSX (1.54%). In terms of maximum drawdown, AMUSX dropped -17.48% vs PRGMX's -18.22%.

Which has better risk-adjusted returns?

PRGMX currently has the higher Sharpe Ratio (1.89 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.