BTTRX vs. PRGMX

Last updated Apr 2, 2026

Compare and contrast key facts about American Century Zero Coupon 2025 Fund (BTTRX) and T. Rowe Price GNMA Fund (PRGMX).

BTTRX is managed by American Century. It was launched on Feb 14, 1996. PRGMX is managed by T. Rowe Price. It was launched on Nov 25, 1985.

Performance

BTTRX vs. PRGMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Zero Coupon 2025 Fund (BTTRX) and T. Rowe Price GNMA Fund (PRGMX). The values are adjusted to include any dividend payments, if applicable.

BTTRX vs. PRGMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BTTRX American Century Zero Coupon 2025 Fund	0.00%	2.79%	9.54%	7.82%	-7.63%	-2.65%	17.73%	11.43%	5.77%	1.22%
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

BTTRX

• 1D: —
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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%

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

BTTRX vs. PRGMX - Expense Ratio Comparison

BTTRX has a 0.54% expense ratio, which is lower than PRGMX's 0.58% expense ratio.

PRGMX

T. Rowe Price GNMA Fund

BTTRX

American Century Zero Coupon 2025 Fund

Return for Risk

BTTRX vs. PRGMX — Risk / Return Rank

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

PRGMX

PRGMX Risk / Return Rank: 85
PRGMX Sharpe Ratio Rank: 86
PRGMX Sortino Ratio Rank: 88
PRGMX Omega Ratio Rank: 79
PRGMX Calmar Ratio Rank: 92
PRGMX Martin Ratio Rank: 80

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.

BTTRX vs. PRGMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Zero Coupon 2025 Fund (BTTRX) 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.

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

Sharpe Ratios by Period

	BTTRX	PRGMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	1.77	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.11	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.30	—
Sharpe Ratio (All Time) Calculated using the full available price history	—	0.94	—

Correlation

The correlation between BTTRX and PRGMX is 0.64, which is considered to be moderate. This suggests that the two assets have some degree of positive relationship in their price movements. Moderate correlation can be acceptable for portfolio diversification, offering a balance between risk and potential returns.

Dividends

BTTRX vs. PRGMX - Dividend Comparison

BTTRX has not paid dividends to shareholders, while PRGMX's dividend yield for the trailing twelve months is around 6.90%.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BTTRX American Century Zero Coupon 2025 Fund	0.00%	0.00%	4.96%	4.00%	3.47%	3.27%	7.69%	3.90%	5.25%	1.05%	3.42%	2.85%
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

Drawdown Indicators

	BTTRX	PRGMX	Difference
Max Drawdown Largest peak-to-trough decline	—	-18.22%	—
Max Drawdown (1Y) Largest decline over 1 year	—	-2.93%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-17.70%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-18.22%	—
Current Drawdown Current decline from peak	—	-1.91%	—
Average Drawdown Average peak-to-trough decline	—	-2.25%	—
Ulcer Index Depth and duration of drawdowns from previous peaks	—	1.00%	—

Volatility

Volatility by Period

	BTTRX	PRGMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	1.74%	—
Volatility (6M) Calculated over the trailing 6-month period	—	2.76%	—
Volatility (1Y) Calculated over the trailing 1-year period	—	4.77%	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	—	6.33%	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	—	4.73%	—