ISTB vs. NUSIX

Last updated Apr 1, 2026

Compare and contrast key facts about iShares Core 1-5 Year USD Bond ETF (ISTB) and Navigator Ultra Short Term Bond Fund (NUSIX).

ISTB is a passively managed fund by iShares that tracks the performance of the BBG US Universal 1-5 Year Index (USD). It was launched on Oct 18, 2012. NUSIX is managed by Navigator Funds. It was launched on Mar 21, 2019.

Performance

ISTB vs. NUSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Core 1-5 Year USD Bond ETF (ISTB) and Navigator Ultra Short Term Bond Fund (NUSIX). The values are adjusted to include any dividend payments, if applicable.

ISTB vs. NUSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
ISTB iShares Core 1-5 Year USD Bond ETF	0.10%	6.36%	4.37%	5.56%	-6.08%	-0.71%	4.75%	3.28%
NUSIX Navigator Ultra Short Term Bond Fund	0.76%	4.63%	5.54%	5.64%	1.14%	0.36%	1.49%	1.60%

Returns By Period

In the year-to-date period, ISTB achieves a 0.10% return, which is significantly lower than NUSIX's 0.76% return.

ISTB

• 1D: 0.21%
• 1M: -0.81%
• YTD: 0.10%
• 6M: 1.31%
• 1Y: 4.49%
• 3Y*: 4.77%
• 5Y*: 1.87%
• 10Y*: 2.31%

NUSIX

• 1D: 0.06%
• 1M: 0.16%
• YTD: 0.76%
• 6M: 1.88%
• 1Y: 4.27%
• 3Y*: 5.11%
• 5Y*: 3.54%
• 10Y*: —

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

ISTB vs. NUSIX - Expense Ratio Comparison

ISTB has a 0.06% expense ratio, which is lower than NUSIX's 0.71% expense ratio.

NUSIX

Navigator Ultra Short Term Bond Fund

ISTB

iShares Core 1-5 Year USD Bond ETF

Return for Risk

ISTB vs. NUSIX — Risk / Return Rank

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

ISTB

ISTB Risk / Return Rank: 95
ISTB Sharpe Ratio Rank: 95
ISTB Sortino Ratio Rank: 97
ISTB Omega Ratio Rank: 95
ISTB Calmar Ratio Rank: 94
ISTB Martin Ratio Rank: 94

NUSIX

NUSIX Risk / Return Rank: 100
NUSIX Sharpe Ratio Rank: 100
NUSIX Sortino Ratio Rank: 100
NUSIX Omega Ratio Rank: 100
NUSIX Calmar Ratio Rank: 100
NUSIX Martin Ratio Rank: 100

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.

ISTB vs. NUSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Core 1-5 Year USD Bond ETF (ISTB) and Navigator Ultra Short Term Bond Fund (NUSIX). 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.

	ISTB	NUSIX	Difference
Sharpe ratio Return per unit of total volatility	2.32	6.58	-4.26
Sortino ratio Return per unit of downside risk	3.56	20.79	-17.23
Omega ratio Gain probability vs. loss probability	1.47	10.67	-9.20
Calmar ratio Return relative to maximum drawdown	3.62	43.05	-39.43
Martin ratio Return relative to average drawdown	14.54	277.18	-262.63
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ISTB vs. NUSIX - Sharpe Ratio Comparison

The current ISTB Sharpe Ratio is 2.32, which is lower than the NUSIX Sharpe Ratio of 6.58. The chart below compares the historical Sharpe Ratios of ISTB and NUSIX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	ISTB	NUSIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.32	6.58	-4.26
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.68	4.68	-4.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.93	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.84	3.67	-2.83

Correlation

The correlation between ISTB and NUSIX is 0.15, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

ISTB vs. NUSIX - Dividend Comparison

ISTB's dividend yield for the trailing twelve months is around 4.18%, which matches NUSIX's 4.20% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ISTB iShares Core 1-5 Year USD Bond ETF	4.18%	4.12%	3.83%	2.97%	2.01%	1.69%	2.20%	2.75%	2.57%	2.06%	1.90%	1.58%
NUSIX Navigator Ultra Short Term Bond Fund	4.20%	4.25%	5.23%	4.92%	1.74%	0.66%	1.08%	1.99%	0.00%	0.00%	0.00%	0.00%

Drawdowns

ISTB vs. NUSIX - Drawdown Comparison

The maximum ISTB drawdown since its inception was -9.34%, which is greater than NUSIX's maximum drawdown of -2.69%. Use the drawdown chart below to compare losses from any high point for ISTB and NUSIX.

Drawdown Indicators

	ISTB	NUSIX	Difference
Max Drawdown Largest peak-to-trough decline	-9.34%	-2.69%	-6.65%
Max Drawdown (1Y) Largest decline over 1 year	-1.26%	-0.10%	-1.16%
Max Drawdown (5Y) Largest decline over 5 years	-9.34%	-0.80%	-8.54%
Max Drawdown (10Y) Largest decline over 10 years	-9.34%	—	—
Current Drawdown Current decline from peak	-0.81%	0.00%	-0.81%
Average Drawdown Average peak-to-trough decline	-1.23%	-0.08%	-1.15%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.31%	0.02%	+0.29%

Volatility

ISTB vs. NUSIX - Volatility Comparison

iShares Core 1-5 Year USD Bond ETF (ISTB) has a higher volatility of 0.78% compared to Navigator Ultra Short Term Bond Fund (NUSIX) at 0.18%. This indicates that ISTB's price experiences larger fluctuations and is considered to be riskier than NUSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ISTB	NUSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.78%	0.18%	+0.60%
Volatility (6M) Calculated over the trailing 6-month period	1.18%	0.44%	+0.74%
Volatility (1Y) Calculated over the trailing 1-year period	1.94%	0.65%	+1.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.78%	0.76%	+2.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.50%	0.83%	+1.67%