ACSNX vs. STBFX

Last updated Jun 3, 2026

ACSNX (American Century Short Duration Fund) and STBFX (Sextant Short Term Bond Fund) are both Short-Term Bond funds. A 0.57 correlation means they provide meaningful diversification when combined. ACSNX charges 0.57%/yr vs 0.60%/yr for STBFX.

Performance

ACSNX vs. STBFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Short Duration Fund (ACSNX) and Sextant Short Term Bond Fund (STBFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

ACSNX

• 1D: -0.10%
• 1M: 0.14%
• YTD: 0.86%
• 6M: 1.23%
• 1Y: 4.24%
• 3Y*: 4.85%
• 5Y*: 2.17%
• 10Y*: 2.32%

STBFX

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

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

ACSNX vs. STBFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ACSNX American Century Short Duration Fund	0.86%	5.65%	4.69%	4.72%	-4.68%	0.97%	4.03%	3.95%	1.35%	1.42%
STBFX Sextant Short Term Bond Fund	0.28%	4.92%	3.87%	3.79%	-4.16%	-1.09%	3.42%	4.03%	1.09%	0.50%

Correlation

The correlation between ACSNX and STBFX is 0.46, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.46
Correlation (3Y) Calculated over the trailing 3-year period	0.59
Correlation (5Y) Calculated over the trailing 5-year period	0.63
Correlation (10Y) Calculated over the trailing 10-year period	0.56
Correlation (All Time) Calculated using the full available price history since Dec 4, 2006	0.57

The correlation between ACSNX and STBFX shifts across timeframes, from 0.46 (1 year) to 0.63 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

ACSNX vs. STBFX — Risk / Return Rank

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

ACSNX

ACSNX Risk / Return Rank: 82
ACSNX Sharpe Ratio Rank: 60
ACSNX Sortino Ratio Rank: 92
ACSNX Omega Ratio Rank: 90
ACSNX Calmar Ratio Rank: 83
ACSNX Martin Ratio Rank: 84

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.

ACSNX vs. STBFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Short Duration Fund (ACSNX) and Sextant Short Term Bond Fund (STBFX). 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.

	ACSNX	STBFX	Difference
Sharpe ratio Return per unit of total volatility	2.29	—	—
Sortino ratio Return per unit of downside risk	4.60	—	—
Omega ratio Gain probability vs. loss probability	1.64	—	—
Calmar ratio Return relative to maximum drawdown	3.84	—	—
Martin ratio Return relative to average drawdown	15.89	—	—
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

	ACSNX	STBFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.29	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.99	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	1.22	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.38	—	—

Drawdowns

Drawdown Indicators

	ACSNX	STBFX	Difference
Max Drawdown Largest peak-to-trough decline	-6.50%	—	—
Max Drawdown (1Y) Largest decline over 1 year	-1.21%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-1.21%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-6.50%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-6.50%	—	—
Current Drawdown Current decline from peak	-0.10%	—	—
Average Drawdown Average peak-to-trough decline	-0.59%	—	—
Ulcer Index Depth and duration of drawdowns from previous peaks	0.29%	—	—

Volatility

Volatility by Period

	ACSNX	STBFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.61%	—	—
Volatility (6M) Calculated over the trailing 6-month period	1.41%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	1.86%	—	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.20%	—	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.91%	—	—

ACSNX vs. STBFX - Expense Ratio Comparison

ACSNX has a 0.57% expense ratio, which is lower than STBFX's 0.60% expense ratio.

Dividends

ACSNX vs. STBFX - Dividend Comparison

ACSNX's dividend yield for the trailing twelve months is around 4.38%, more than STBFX's 2.61% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACSNX American Century Short Duration Fund	4.38%	4.55%	4.56%	3.96%	1.60%	1.74%	1.51%	2.59%	2.53%	1.91%	1.62%	1.73%
STBFX Sextant Short Term Bond Fund	2.61%	3.17%	2.77%	1.84%	1.04%	1.07%	1.60%	1.75%	1.47%	1.30%	1.06%	1.07%

Frequently Asked Questions

Can I hold both ACSNX and STBFX in my portfolio?

ACSNX and STBFX have a correlation of 0.46, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.