ISTB vs. FLDB
Compare and contrast key facts about iShares Core 1-5 Year USD Bond ETF (ISTB) and Fidelity Low Duration Bond ETF (FLDB).
ISTB and FLDB are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. 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. FLDB is an actively managed fund by Fidelity. It was launched on Feb 22, 2024.
Performance
ISTB vs. FLDB - Performance Comparison
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ISTB vs. FLDB - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | |
|---|---|---|---|
ISTB iShares Core 1-5 Year USD Bond ETF | 0.10% | 6.36% | 4.73% |
FLDB Fidelity Low Duration Bond ETF | 0.80% | 4.93% | 4.29% |
Returns By Period
In the year-to-date period, ISTB achieves a 0.10% return, which is significantly lower than FLDB's 0.80% 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%
FLDB
- 1D
- 0.06%
- 1M
- 0.12%
- YTD
- 0.80%
- 6M
- 1.91%
- 1Y
- 4.65%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
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ISTB vs. FLDB - Expense Ratio Comparison
ISTB has a 0.06% expense ratio, which is lower than FLDB's 0.20% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Return for Risk
ISTB vs. FLDB — Risk / Return Rank
ISTB
FLDB
ISTB vs. FLDB - 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 Fidelity Low Duration Bond ETF (FLDB). 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 | FLDB | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 2.32 | 4.45 | -2.13 |
Sortino ratioReturn per unit of downside risk | 3.56 | 7.69 | -4.13 |
Omega ratioGain probability vs. loss probability | 1.47 | 2.09 | -0.63 |
Calmar ratioReturn relative to maximum drawdown | 3.62 | 11.28 | -7.66 |
Martin ratioReturn relative to average drawdown | 14.54 | 64.34 | -49.79 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| ISTB | FLDB | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 2.32 | 4.45 | -2.13 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.68 | — | — |
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 | 3.62 | -2.78 |
Correlation
The correlation between ISTB and FLDB is 0.30, 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. FLDB - Dividend Comparison
ISTB's dividend yield for the trailing twelve months is around 4.18%, less than FLDB's 4.55% 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% |
FLDB Fidelity Low Duration Bond ETF | 4.55% | 4.72% | 3.58% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Drawdowns
ISTB vs. FLDB - Drawdown Comparison
The maximum ISTB drawdown since its inception was -9.34%, which is greater than FLDB's maximum drawdown of -0.49%. Use the drawdown chart below to compare losses from any high point for ISTB and FLDB.
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Drawdown Indicators
| ISTB | FLDB | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -9.34% | -0.49% | -8.85% |
Max Drawdown (1Y)Largest decline over 1 year | -1.26% | -0.40% | -0.86% |
Max Drawdown (5Y)Largest decline over 5 years | -9.34% | — | — |
Max Drawdown (10Y)Largest decline over 10 years | -9.34% | — | — |
Current DrawdownCurrent decline from peak | -0.81% | 0.00% | -0.81% |
Average DrawdownAverage peak-to-trough decline | -1.23% | -0.05% | -1.18% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.31% | 0.07% | +0.24% |
Volatility
ISTB vs. FLDB - Volatility Comparison
iShares Core 1-5 Year USD Bond ETF (ISTB) has a higher volatility of 0.78% compared to Fidelity Low Duration Bond ETF (FLDB) at 0.28%. This indicates that ISTB's price experiences larger fluctuations and is considered to be riskier than FLDB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| ISTB | FLDB | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.78% | 0.28% | +0.50% |
Volatility (6M)Calculated over the trailing 6-month period | 1.18% | 0.68% | +0.50% |
Volatility (1Y)Calculated over the trailing 1-year period | 1.94% | 1.07% | +0.87% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 2.78% | 1.33% | +1.45% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 2.50% | 1.33% | +1.17% |