BWZ vs. IEI
BWZ (SPDR Bloomberg Barclays Short Term International Treasury Bond ETF) and IEI (iShares 3-7 Year Treasury Bond ETF) are both exchange-traded funds - BWZ is a International Government Bonds fund tracking the Bloomberg Global Treasury (1-3 Y) Customized, while IEI is a Government Bonds fund tracking the ICE U.S. Treasury 3-7 Year Bond Index. Both are passively managed. Over the past 10 years, BWZ returned -0.55%/yr vs 1.16%/yr for IEI. Their 0.24 correlation means their historical movements had little consistent relationship. BWZ charges 0.35%/yr vs 0.15%/yr for IEI.
Performance
BWZ vs. IEI - Performance Comparison
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Returns By Period
In the year-to-date period, BWZ achieves a 0.01% return, which is significantly higher than IEI's -0.62% return. Over the past 10 years, BWZ has underperformed IEI with an annualized return of -0.55%, while IEI has yielded a comparatively higher 1.16% annualized return.
BWZ
- 1D
- -0.11%
- 1M
- 1.61%
- 6M
- -1.75%
- YTD
- 0.01%
- 1Y
- 0.57%
- 3Y*
- 2.54%
- 5Y*
- -1.46%
- 10Y*
- -0.55%
- ALL TIME*
- -0.16%
IEI
- 1D
- -0.14%
- 1M
- -0.54%
- 6M
- -0.62%
- YTD
- -0.62%
- 1Y
- 1.16%
- 3Y*
- 3.83%
- 5Y*
- 0.05%
- 10Y*
- 1.16%
- ALL TIME*
- 2.82%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $4.01M | $3.45M | $2.62M | |
| $154.98M | $144.96M | $146.28M |
BWZ vs. IEI - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
BWZ SPDR Bloomberg Barclays Short Term International Treasury Bond ETF | 0.01% | 10.47% | -5.31% | 2.97% | -10.56% | -6.85% | 6.47% | 0.99% | -3.36% | 10.18% |
IEI iShares 3-7 Year Treasury Bond ETF | -0.62% | 6.96% | 1.81% | 4.42% | -9.51% | -2.54% | 6.95% | 5.71% | 1.36% | 1.22% |
Correlation
The correlation between BWZ and IEI is 0.49, which is low. Their historical price movements had little consistent relationship.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.49 |
Correlation (3Y) Balances recent behavior with more history. | 0.48 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.47 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.38 |
Correlation (All Time) Calculated using the full available price history since Jan 30, 2009 | 0.25 |
Over the past year, BWZ and IEI have become more correlated (0.49) than their long-term average of 0.24, meaning their price movements have been converging.
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Return for Risk
BWZ vs. IEI — Risk / Return Rank
BWZ
IEI
BWZ vs. IEI - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for SPDR Bloomberg Barclays Short Term International Treasury Bond ETF (BWZ) and iShares 3-7 Year Treasury Bond ETF (IEI). 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.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| BWZ | IEI | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.40 | ||
| Sortino ratioReturn per unit of downside risk | -0.55 | ||
| Omega ratioGain probability vs. loss probability | 1.05 | 1.12 | -0.06 |
| Calmar ratioReturn relative to maximum drawdown | 0.38 | 0.83 | -0.45 |
| Martin ratioReturn relative to average drawdown | 0.70 | 1.90 | -1.20 |
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Drawdowns
BWZ vs. IEI - Drawdown Comparison
The maximum BWZ drawdown since its inception was -34.23%, which is greater than IEI's maximum drawdown of -14.60%. Use the drawdown chart below to compare losses from any high point for BWZ and IEI.
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Drawdown Indicators
| BWZ | IEI | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -34.23% | -14.60% | -19.63% |
Max Drawdown (1Y)Largest decline over 1 year | -5.15% | -2.50% | -2.65% |
Max Drawdown (3Y)Largest decline over 3 years | -8.60% | -3.66% | -4.94% |
Max Drawdown (5Y)Largest decline over 5 years | -21.92% | -13.82% | -8.10% |
Max Drawdown (10Y)Largest decline over 10 years | -24.90% | -14.60% | -10.30% |
Current DrawdownCurrent decline from peak | -21.91% | -2.05% | -19.86% |
Average DrawdownAverage peak-to-trough decline | -16.16% | -2.67% | -13.49% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.78% | 1.09% | +1.69% |
Volatility
BWZ vs. IEI - Volatility Comparison
SPDR Bloomberg Barclays Short Term International Treasury Bond ETF (BWZ) has a higher volatility of 2.31% compared to iShares 3-7 Year Treasury Bond ETF (IEI) at 0.77%. This indicates that BWZ's price experiences larger fluctuations and is considered to be riskier than IEI based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| BWZ | IEI | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.31% | 0.77% | +1.54% |
Volatility (6M)Calculated over the trailing 6-month period | 5.17% | 2.36% | +2.81% |
Volatility (1Y)Calculated over the trailing 1-year period | 6.84% | 3.02% | +3.82% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 7.64% | 4.78% | +2.86% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 6.94% | 3.93% | +3.01% |
BWZ vs. IEI - Expense Ratio Comparison
BWZ has a 0.35% expense ratio, which is higher than IEI's 0.15% expense ratio.
Dividends
BWZ vs. IEI - Dividend Comparison
BWZ's dividend yield for the trailing twelve months is around 2.08%, less than IEI's 3.68% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BWZ SPDR Bloomberg Barclays Short Term International Treasury Bond ETF | 1.91% | 2.05% | 2.47% | 1.63% | 0.44% | 0.60% | 0.13% | 0.43% | 1.10% | 0.40% | 0.13% | 0.06% |
IEI iShares 3-7 Year Treasury Bond ETF | 3.38% | 3.48% | 3.18% | 2.36% | 1.37% | 0.73% | 1.12% | 2.01% | 1.95% | 1.51% | 1.33% | 1.39% |
Frequently Asked Questions
BWZ and IEI have a correlation of 0.49, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
BWZ has higher volatility (2.31%) compared to IEI (0.77%). In terms of maximum drawdown, BWZ dropped -34.23% vs IEI's -14.60%.
On 10-year performance, IEI leads with 1.16% vs -0.55% for BWZ. On fees, IEI is cheaper at 0.15% per year. On volatility, IEI has been the lower-risk option at 0.77%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 10-year period, IEI has performed better with a 1.16% return vs -0.55%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
IEI is cheaper with a 0.15% expense ratio, compared with 0.35% for BWZ.
IEI has the higher dividend yield at 3.38%, compared with 1.91% for BWZ.
BWZ is categorized as International Government Bonds, while IEI is Government Bonds. BWZ tracks Bloomberg Global Treasury (1-3 Y) Customized, while IEI tracks ICE U.S. Treasury 3-7 Year Bond Index. They also come from different issuers: State Street and iShares. Their fees differ too: 0.35% for BWZ and 0.15% for IEI.
IEI currently has the higher Sharpe Ratio (0.69 vs 0.28), 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.
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