BGNMX vs. BTTRX

Last updated Jun 5, 2026

BGNMX (American Century Ginnie Mae Fund) and BTTRX (American Century Zero Coupon 2025 Fund) are both Government Bonds funds from American Century. A 0.63 correlation means they provide meaningful diversification when combined. BGNMX charges 0.55%/yr vs 0.54%/yr for BTTRX.

Performance

BGNMX vs. BTTRX - Performance Comparison

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

Returns By Period

BGNMX

• 1D: -0.11%
• 1M: -0.01%
• YTD: 0.62%
• 6M: 0.95%
• 1Y: 5.53%
• 3Y*: 3.76%
• 5Y*: -0.15%
• 10Y*: 0.87%

BTTRX

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

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

BGNMX vs. BTTRX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BGNMX American Century Ginnie Mae Fund	0.62%	7.43%	0.52%	4.72%	-12.06%	-1.79%	3.73%	6.17%	0.44%	1.22%
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%

Correlation

The correlation between BGNMX and BTTRX is 0.12, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.12
Correlation (3Y) Calculated over the trailing 3-year period	0.62
Correlation (5Y) Calculated over the trailing 5-year period	0.69
Correlation (10Y) Calculated over the trailing 10-year period	0.63
Correlation (All Time) Calculated using the full available price history since Feb 16, 1996	0.63

Over the past year, the correlation between BGNMX and BTTRX has dropped to 0.12 - well below their long-term average of 0.63, suggesting their price drivers have been diverging.

Return for Risk

BGNMX vs. BTTRX — Risk / Return Rank

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

BGNMX

BGNMX Risk / Return Rank: 30
BGNMX Sharpe Ratio Rank: 29
BGNMX Sortino Ratio Rank: 31
BGNMX Omega Ratio Rank: 30
BGNMX Calmar Ratio Rank: 30
BGNMX Martin Ratio Rank: 30

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.

BGNMX vs. BTTRX - Risk-Adjusted Trends Comparison

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

	BGNMX	BTTRX	Difference
Sharpe ratio: Return per unit of total volatility	1.51	—	—
Sortino ratio: Return per unit of downside risk	2.24	—	—
Omega ratio: Gain probability vs. loss probability	1.28	—	—
Calmar ratio: Return relative to maximum drawdown	2.00	—	—
Martin ratio: Return relative to average drawdown	6.72	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	BGNMX	BTTRX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.51	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.02	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.18	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.94	—	—

Drawdowns

Drawdown Indicators

	BGNMX	BTTRX	Difference
Max Drawdown Largest peak-to-trough decline	-18.46%	—	—
Max Drawdown (1Y) Largest decline over 1 year	-3.07%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-7.78%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-17.74%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-18.46%	—	—
Current Drawdown Current decline from peak	-1.72%	—	—
Average Drawdown Average peak-to-trough decline	-2.03%	—	—
Ulcer Index Depth and duration of drawdowns from previous peaks	0.91%	—	—

Volatility

Volatility by Period

	BGNMX	BTTRX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.60%	—	—
Volatility (6M) Calculated over the trailing 6-month period	2.99%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	4.07%	—	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.45%	—	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.84%	—	—

BGNMX vs. BTTRX - Expense Ratio Comparison

BGNMX has a 0.55% expense ratio, which is higher than BTTRX's 0.54% expense ratio.

Dividends

BGNMX vs. BTTRX - Dividend Comparison

BGNMX's dividend yield for the trailing twelve months is around 3.94%, while BTTRX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BGNMX American Century Ginnie Mae Fund	3.94%	3.86%	3.70%	3.21%	1.90%	1.64%	2.16%	2.68%	2.65%	2.37%	2.37%	2.37%
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%

Frequently Asked Questions

Can I hold both BGNMX and BTTRX in my portfolio?

BGNMX and BTTRX have a correlation of 0.12, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.