BTTRX vs. VSBIX

Last updated Jun 5, 2026

BTTRX (American Century Zero Coupon 2025 Fund) and VSBIX (Vanguard Short-Term Treasury Index Fund Institutional Shares) are both Government Bonds funds. A 0.63 correlation means they provide meaningful diversification when combined. BTTRX charges 0.54%/yr vs 0.05%/yr for VSBIX.

Performance

BTTRX vs. VSBIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Zero Coupon 2025 Fund (BTTRX) and Vanguard Short-Term Treasury Index Fund Institutional Shares (VSBIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

BTTRX

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

VSBIX

• 1D: -0.04%
• 1M: 0.03%
• YTD: 0.48%
• 6M: 0.81%
• 1Y: 3.27%
• 3Y*: 4.27%
• 5Y*: 1.87%
• 10Y*: 1.77%

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

BTTRX vs. VSBIX - 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%
VSBIX Vanguard Short-Term Treasury Index Fund Institutional Shares	0.48%	5.11%	4.37%	4.28%	-3.87%	-0.67%	3.11%	3.53%	1.52%	0.40%

Correlation

The correlation between BTTRX and VSBIX is 0.13, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.13
Correlation (3Y) Calculated over the trailing 3-year period	0.76
Correlation (5Y) Calculated over the trailing 5-year period	0.80
Correlation (10Y) Calculated over the trailing 10-year period	0.72
Correlation (All Time) Calculated using the full available price history since Nov 24, 2009	0.63

Over the past year, the correlation between BTTRX and VSBIX has dropped to 0.13 - well below their long-term average of 0.63, suggesting their price drivers have been diverging.

Return for Risk

BTTRX vs. VSBIX — Risk / Return Rank

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

VSBIX

VSBIX Risk / Return Rank: 87
VSBIX Sharpe Ratio Rank: 83
VSBIX Sortino Ratio Rank: 91
VSBIX Omega Ratio Rank: 84
VSBIX Calmar Ratio Rank: 87
VSBIX Martin Ratio Rank: 90

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. VSBIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Zero Coupon 2025 Fund (BTTRX) and Vanguard Short-Term Treasury Index Fund Institutional Shares (VSBIX). 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	VSBIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	2.73	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.96	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	1.16	—
Sharpe Ratio (All Time) Calculated using the full available price history	—	1.09	—

Drawdowns

Drawdown Indicators

	BTTRX	VSBIX	Difference
Max Drawdown Largest peak-to-trough decline	—	-5.74%	—
Max Drawdown (1Y) Largest decline over 1 year	—	-0.81%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-0.81%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-5.74%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-5.74%	—
Current Drawdown Current decline from peak	—	-0.24%	—
Average Drawdown Average peak-to-trough decline	—	-0.59%	—
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.20%	—

Volatility

Volatility by Period

	BTTRX	VSBIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.39%	—
Volatility (6M) Calculated over the trailing 6-month period	—	0.86%	—
Volatility (1Y) Calculated over the trailing 1-year period	—	1.27%	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	—	1.95%	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	—	1.53%	—

BTTRX vs. VSBIX - Expense Ratio Comparison

BTTRX has a 0.54% expense ratio, which is higher than VSBIX's 0.05% expense ratio.

Dividends

BTTRX vs. VSBIX - Dividend Comparison

BTTRX has not paid dividends to shareholders, while VSBIX's dividend yield for the trailing twelve months is around 3.87%.

Position	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%
VSBIX Vanguard Short-Term Treasury Index Fund Institutional Shares	3.87%	3.99%	4.52%	3.31%	1.14%	0.65%	1.74%	2.28%	1.81%	1.11%	0.80%	0.74%

Frequently Asked Questions

Can I hold both BTTRX and VSBIX in my portfolio?

BTTRX and VSBIX have a correlation of 0.13, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.