CPTNX vs. PRGMX
Compare and contrast key facts about American Century Government Bond Fund (CPTNX) and T. Rowe Price GNMA Fund (PRGMX).
CPTNX is managed by American Century. It was launched on May 15, 1980. PRGMX is managed by T. Rowe Price. It was launched on Nov 25, 1985.
Performance
CPTNX vs. PRGMX - Performance Comparison
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CPTNX vs. PRGMX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
CPTNX American Century Government Bond Fund | -0.22% | 7.26% | 0.32% | 3.51% | -13.10% | -1.24% | 6.71% | 6.16% | 0.57% | 2.15% |
PRGMX T. Rowe Price GNMA Fund | 0.87% | 10.46% | 0.92% | 5.62% | -11.45% | -2.18% | 4.21% | 5.18% | 0.58% | 1.23% |
Returns By Period
In the year-to-date period, CPTNX achieves a -0.22% return, which is significantly lower than PRGMX's 0.87% return. Over the past 10 years, CPTNX has underperformed PRGMX with an annualized return of 0.89%, while PRGMX has yielded a comparatively higher 1.40% annualized return.
CPTNX
- 1D
- 0.21%
- 1M
- -1.57%
- YTD
- -0.22%
- 6M
- 0.69%
- 1Y
- 3.67%
- 3Y*
- 2.58%
- 5Y*
- -0.51%
- 10Y*
- 0.89%
PRGMX
- 1D
- 0.24%
- 1M
- -1.44%
- YTD
- 0.87%
- 6M
- 2.89%
- 1Y
- 7.97%
- 3Y*
- 4.79%
- 5Y*
- 0.72%
- 10Y*
- 1.40%
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CPTNX vs. PRGMX - Expense Ratio Comparison
CPTNX has a 0.47% expense ratio, which is lower than PRGMX's 0.58% expense ratio.
Return for Risk
CPTNX vs. PRGMX — Risk / Return Rank
CPTNX
PRGMX
CPTNX vs. PRGMX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for American Century Government Bond Fund (CPTNX) 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.
| CPTNX | PRGMX | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 0.90 | 1.77 | -0.87 |
Sortino ratioReturn per unit of downside risk | 1.30 | 2.53 | -1.24 |
Omega ratioGain probability vs. loss probability | 1.16 | 1.33 | -0.17 |
Calmar ratioReturn relative to maximum drawdown | 1.56 | 3.01 | -1.45 |
Martin ratioReturn relative to average drawdown | 4.25 | 8.77 | -4.52 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| CPTNX | PRGMX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 0.90 | 1.77 | -0.87 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | -0.08 | 0.11 | -0.20 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.18 | 0.30 | -0.12 |
Sharpe Ratio (All Time)Calculated using the full available price history | 1.15 | 0.94 | +0.21 |
Correlation
The correlation between CPTNX and PRGMX is 0.81, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.
Dividends
CPTNX vs. PRGMX - Dividend Comparison
CPTNX's dividend yield for the trailing twelve months is around 3.72%, less than PRGMX's 6.90% yield.
| TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
CPTNX American Century Government Bond Fund | 3.72% | 4.07% | 4.22% | 3.72% | 1.84% | 2.10% | 2.09% | 2.48% | 2.49% | 2.14% | 2.28% | 1.69% |
PRGMX T. Rowe Price GNMA Fund | 6.90% | 6.52% | 3.54% | 3.54% | 1.38% | 0.59% | 1.44% | 2.39% | 2.78% | 2.98% | 2.88% | 3.12% |
Drawdowns
CPTNX vs. PRGMX - Drawdown Comparison
The maximum CPTNX drawdown since its inception was -19.73%, which is greater than PRGMX's maximum drawdown of -18.22%. Use the drawdown chart below to compare losses from any high point for CPTNX and PRGMX.
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Drawdown Indicators
| CPTNX | PRGMX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -19.73% | -18.22% | -1.51% |
Max Drawdown (1Y)Largest decline over 1 year | -2.95% | -2.93% | -0.02% |
Max Drawdown (5Y)Largest decline over 5 years | -19.15% | -17.70% | -1.45% |
Max Drawdown (10Y)Largest decline over 10 years | -19.73% | -18.22% | -1.51% |
Current DrawdownCurrent decline from peak | -5.30% | -1.91% | -3.39% |
Average DrawdownAverage peak-to-trough decline | -2.28% | -2.25% | -0.03% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.08% | 1.00% | +0.08% |
Volatility
CPTNX vs. PRGMX - Volatility Comparison
The current volatility for American Century Government Bond Fund (CPTNX) is 1.59%, while T. Rowe Price GNMA Fund (PRGMX) has a volatility of 1.74%. This indicates that CPTNX 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.
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Volatility by Period
| CPTNX | PRGMX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.59% | 1.74% | -0.15% |
Volatility (6M)Calculated over the trailing 6-month period | 2.66% | 2.76% | -0.10% |
Volatility (1Y)Calculated over the trailing 1-year period | 4.62% | 4.77% | -0.15% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.24% | 6.33% | -0.09% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.96% | 4.73% | +0.23% |