TNSHX vs. ACSNX

Last updated Jun 3, 2026

TNSHX (TIAA-CREF Short-Term Bond Index Fund) and ACSNX (American Century Short Duration Fund) are both Short-Term Bond funds. Over the past 10 years, TNSHX returned 1.83%/yr vs 2.32%/yr for ACSNX. A 0.72 correlation means they provide meaningful diversification when combined. TNSHX charges 0.09%/yr vs 0.57%/yr for ACSNX.

Performance

TNSHX vs. ACSNX - Performance Comparison

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

Returns By Period

In the year-to-date period, TNSHX achieves a 0.61% return, which is significantly lower than ACSNX's 0.86% return. Over the past 10 years, TNSHX has underperformed ACSNX with an annualized return of 1.83%, while ACSNX has yielded a comparatively higher 2.32% annualized return.

TNSHX

• 1D: -0.10%
• 1M: 0.12%
• YTD: 0.61%
• 6M: 0.96%
• 1Y: 3.74%
• 3Y*: 4.25%
• 5Y*: 1.81%
• 10Y*: 1.83%

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%

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

TNSHX vs. ACSNX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TNSHX TIAA-CREF Short-Term Bond Index Fund	0.61%	5.31%	4.03%	4.05%	-3.96%	-0.57%	3.26%	4.05%	1.31%	0.70%
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%

Correlation

The correlation between TNSHX and ACSNX is 0.74, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.74
Correlation (3Y) Calculated over the trailing 3-year period	0.80
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (10Y) Calculated over the trailing 10-year period	0.72
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.72

The correlation between TNSHX and ACSNX has been stable across timeframes, ranging from 0.72 to 0.81 - a consistent structural relationship.

Return for Risk

TNSHX vs. ACSNX — Risk / Return Rank

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

TNSHX

TNSHX Risk / Return Rank: 70
TNSHX Sharpe Ratio Rank: 44
TNSHX Sortino Ratio Rank: 78
TNSHX Omega Ratio Rank: 74
TNSHX Calmar Ratio Rank: 81
TNSHX Martin Ratio Rank: 73

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.

TNSHX vs. ACSNX - Risk-Adjusted Trends Comparison

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

	TNSHX	ACSNX	Difference
Sharpe ratio Return per unit of total volatility	1.95	2.29	-0.34
Sortino ratio Return per unit of downside risk	3.73	4.60	-0.87
Omega ratio Gain probability vs. loss probability	1.49	1.64	-0.15
Calmar ratio Return relative to maximum drawdown	3.73	3.84	-0.12
Martin ratio Return relative to average drawdown	13.99	15.89	-1.90
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TNSHX vs. ACSNX - Sharpe Ratio Comparison

The current TNSHX Sharpe Ratio is 1.95, which is comparable to the ACSNX Sharpe Ratio of 2.29. The chart below compares the historical Sharpe Ratios of TNSHX and ACSNX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	TNSHX	ACSNX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.95	2.29	-0.34
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.81	0.99	-0.18
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	1.01	1.22	-0.20
Sharpe Ratio (All Time) Calculated using the full available price history	1.04	1.38	-0.34

Drawdowns

TNSHX vs. ACSNX - Drawdown Comparison

The maximum TNSHX drawdown since its inception was -5.99%, smaller than the maximum ACSNX drawdown of -6.50%. Use the drawdown chart below to compare losses from any high point for TNSHX and ACSNX.

Drawdown Indicators

	TNSHX	ACSNX	Difference
Max Drawdown Largest peak-to-trough decline	-5.99%	-6.50%	+0.51%
Max Drawdown (1Y) Largest decline over 1 year	-1.13%	-1.21%	+0.08%
Max Drawdown (3Y) Largest decline over 3 years	-1.13%	-1.21%	+0.08%
Max Drawdown (5Y) Largest decline over 5 years	-5.99%	-6.50%	+0.51%
Max Drawdown (10Y) Largest decline over 10 years	-5.99%	-6.50%	+0.51%
Current Drawdown Current decline from peak	-0.15%	-0.10%	-0.05%
Average Drawdown Average peak-to-trough decline	-0.89%	-0.59%	-0.30%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.30%	0.29%	+0.01%

Volatility

TNSHX vs. ACSNX - Volatility Comparison

TIAA-CREF Short-Term Bond Index Fund (TNSHX) and American Century Short Duration Fund (ACSNX) have volatilities of 0.63% and 0.61%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TNSHX	ACSNX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.63%	0.61%	+0.02%
Volatility (6M) Calculated over the trailing 6-month period	1.38%	1.41%	-0.03%
Volatility (1Y) Calculated over the trailing 1-year period	1.88%	1.86%	+0.02%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.25%	2.20%	+0.05%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.82%	1.91%	-0.09%

TNSHX vs. ACSNX - Expense Ratio Comparison

TNSHX has a 0.09% expense ratio, which is lower than ACSNX's 0.57% expense ratio.

Dividends

TNSHX vs. ACSNX - Dividend Comparison

TNSHX's dividend yield for the trailing twelve months is around 4.10%, less than ACSNX's 4.38% 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%
TNSHX TIAA-CREF Short-Term Bond Index Fund	4.10%	4.22%	3.94%	2.68%	1.00%	1.03%	1.81%	2.45%	1.80%	1.31%	0.98%	0.00%

Frequently Asked Questions

Can I hold both TNSHX and ACSNX in my portfolio?

TNSHX and ACSNX have a correlation of 0.74, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TNSHX or ACSNX?

TNSHX has higher volatility (0.63%) compared to ACSNX (0.61%). In terms of maximum drawdown, TNSHX dropped -5.99% vs ACSNX's -6.50%.

Which has better risk-adjusted returns?

ACSNX currently has the higher Sharpe Ratio (2.29 vs 1.95), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.