BWZ vs. IGOV

Last updated Jun 3, 2026

BWZ (SPDR Bloomberg Barclays Short Term International Treasury Bond ETF) and IGOV (iShares International Treasury Bond ETF) are both International Government Bonds funds - BWZ tracks the Bloomberg Global Treasury (1-3 Y) Customized while IGOV tracks the S&P/Citigroup International Treasury Bond Index Ex-US. Both are passively managed. Over the past 10 years, BWZ returned -0.44%/yr vs -1.30%/yr for IGOV. A 0.76 correlation means they provide meaningful diversification when combined. Both charge a 0.35% expense ratio.

Performance

BWZ vs. IGOV - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SPDR Bloomberg Barclays Short Term International Treasury Bond ETF (BWZ) and iShares International Treasury Bond ETF (IGOV). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BWZ achieves a -0.10% return, which is significantly lower than IGOV's 0.34% return. Over the past 10 years, BWZ has outperformed IGOV with an annualized return of -0.44%, while IGOV has yielded a comparatively lower -1.30% annualized return.

BWZ

• 1D: 0.18%
• 1M: -0.63%
• YTD: -0.10%
• 6M: 1.00%
• 1Y: -0.05%
• 3Y*: 2.76%
• 5Y*: -1.78%
• 10Y*: -0.44%

IGOV

• 1D: 0.07%
• 1M: -0.05%
• YTD: 0.34%
• 6M: 0.74%
• 1Y: 0.69%
• 3Y*: 2.85%
• 5Y*: -4.22%
• 10Y*: -1.30%

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

BWZ vs. IGOV - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BWZ SPDR Bloomberg Barclays Short Term International Treasury Bond ETF	-0.10%	10.47%	-5.31%	2.97%	-10.56%	-6.85%	6.47%	0.99%	-3.36%	10.18%
IGOV iShares International Treasury Bond ETF	0.34%	9.96%	-6.50%	5.57%	-22.07%	-9.25%	10.88%	3.76%	-2.60%	11.38%

Correlation

The correlation between BWZ and IGOV is 0.82, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.82
Correlation (3Y) Calculated over the trailing 3-year period	0.78
Correlation (5Y) Calculated over the trailing 5-year period	0.79
Correlation (10Y) Calculated over the trailing 10-year period	0.78
Correlation (All Time) Calculated using the full available price history since Feb 2, 2009	0.76

The correlation between BWZ and IGOV has been stable across timeframes, ranging from 0.76 to 0.82 - a consistent structural relationship.

Return for Risk

BWZ vs. IGOV — Risk / Return Rank

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

BWZ

BWZ Risk / Return Rank: 9
BWZ Sharpe Ratio Rank: 9
BWZ Sortino Ratio Rank: 8
BWZ Omega Ratio Rank: 8
BWZ Calmar Ratio Rank: 10
BWZ Martin Ratio Rank: 10

IGOV

IGOV Risk / Return Rank: 10
IGOV Sharpe Ratio Rank: 10
IGOV Sortino Ratio Rank: 9
IGOV Omega Ratio Rank: 9
IGOV Calmar Ratio Rank: 11
IGOV Martin Ratio Rank: 11

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.

BWZ vs. IGOV - 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 International Treasury Bond ETF (IGOV). 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.

	BWZ	IGOV	Difference
Sharpe ratio Return per unit of total volatility	-0.01	0.09	-0.09
Sortino ratio Return per unit of downside risk	0.04	0.18	-0.14
Omega ratio Gain probability vs. loss probability	1.00	1.02	-0.02
Calmar ratio Return relative to maximum drawdown	0.13	0.26	-0.13
Martin ratio Return relative to average drawdown	0.31	0.63	-0.32
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BWZ vs. IGOV - Sharpe Ratio Comparison

The current BWZ Sharpe Ratio is -0.01, which is lower than the IGOV Sharpe Ratio of 0.09. The chart below compares the historical Sharpe Ratios of BWZ and IGOV, 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

	BWZ	IGOV	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-0.01	0.09	-0.09
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.24	-0.43	+0.19
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.06	-0.15	+0.09
Sharpe Ratio (All Time) Calculated using the full available price history	-0.02	0.02	-0.04

Drawdowns

BWZ vs. IGOV - Drawdown Comparison

The maximum BWZ drawdown since its inception was -34.23%, roughly equal to the maximum IGOV drawdown of -35.88%. Use the drawdown chart below to compare losses from any high point for BWZ and IGOV.

Drawdown Indicators

	BWZ	IGOV	Difference
Max Drawdown Largest peak-to-trough decline	-34.23%	-35.88%	+1.65%
Max Drawdown (1Y) Largest decline over 1 year	-5.15%	-5.70%	+0.55%
Max Drawdown (3Y) Largest decline over 3 years	-8.60%	-10.65%	+2.05%
Max Drawdown (5Y) Largest decline over 5 years	-23.58%	-33.17%	+9.59%
Max Drawdown (10Y) Largest decline over 10 years	-24.90%	-35.88%	+10.98%
Current Drawdown Current decline from peak	-21.99%	-23.37%	+1.38%
Average Drawdown Average peak-to-trough decline	-16.10%	-11.01%	-5.09%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.24%	2.41%	-0.17%

Volatility

BWZ vs. IGOV - Volatility Comparison

The current volatility for SPDR Bloomberg Barclays Short Term International Treasury Bond ETF (BWZ) is 1.79%, while iShares International Treasury Bond ETF (IGOV) has a volatility of 2.71%. This indicates that BWZ experiences smaller price fluctuations and is considered to be less risky than IGOV based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BWZ	IGOV	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.79%	2.71%	-0.92%
Volatility (6M) Calculated over the trailing 6-month period	4.95%	6.14%	-1.19%
Volatility (1Y) Calculated over the trailing 1-year period	6.95%	8.11%	-1.16%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	7.60%	9.95%	-2.35%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	6.95%	8.59%	-1.64%

BWZ vs. IGOV - Expense Ratio Comparison

Both BWZ and IGOV have an expense ratio of 0.35%.

Dividends

BWZ vs. IGOV - Dividend Comparison

BWZ's dividend yield for the trailing twelve months is around 2.08%, more than IGOV's 1.40% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BWZ SPDR Bloomberg Barclays Short Term International Treasury Bond ETF	2.08%	2.05%	2.47%	1.63%	0.44%	0.60%	0.13%	0.43%	1.10%	0.40%	0.13%	0.06%
IGOV iShares International Treasury Bond ETF	1.40%	1.41%	0.59%	0.00%	0.11%	0.39%	0.00%	0.24%	0.31%	0.19%	0.69%	0.12%

Frequently Asked Questions

Can I hold both BWZ and IGOV in my portfolio?

BWZ and IGOV have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BWZ or IGOV?

IGOV has higher volatility (2.71%) compared to BWZ (1.79%). In terms of maximum drawdown, BWZ dropped -34.23% vs IGOV's -35.88%.

Which ETF is better, BWZ or IGOV?

On 10-year performance, BWZ leads with -0.44% vs -1.30% for IGOV. Both ETFs have the same 0.35% expense ratio. On volatility, BWZ has been the lower-risk option at 1.79%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, BWZ or IGOV?

Over the 10-year period, BWZ has performed better with a -0.44% return vs -1.30%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, BWZ or IGOV?

BWZ and IGOV have the same expense ratio: 0.35% per year.

Which ETF pays a higher dividend yield, BWZ or IGOV?

BWZ has the higher dividend yield at 2.08%, compared with 1.40% for IGOV.

What is the main difference between BWZ and IGOV?

BWZ tracks Bloomberg Global Treasury (1-3 Y) Customized, while IGOV tracks S&P/Citigroup International Treasury Bond Index Ex-US. They also come from different issuers: State Street and iShares.

Which has better risk-adjusted returns?

IGOV currently has the higher Sharpe Ratio (0.09 vs -0.01), 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.