AGZ vs. BWX

Last updated Apr 1, 2026

Compare and contrast key facts about iShares Agency Bond ETF (AGZ) and SPDR Bloomberg Barclays International Treasury Bond ETF (BWX).

AGZ and BWX are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. AGZ is a passively managed fund by iShares that tracks the performance of the Bloomberg U.S. Agency Bond Index (USD). It was launched on Nov 5, 2008. BWX is a passively managed fund by State Street that tracks the performance of the Bloomberg Global Treasury x US Capped (Inception 8/31/2007). It was launched on Oct 2, 2007. Both AGZ and BWX are passive ETFs, meaning that they are not actively managed but aim to replicate the performance of the underlying index as closely as possible.

Performance

AGZ vs. BWX - Performance Comparison

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

AGZ vs. BWX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AGZ iShares Agency Bond ETF	0.11%	6.05%	3.08%	5.18%	-7.77%	-1.05%	5.77%	5.51%	1.32%	2.01%
BWX SPDR Bloomberg Barclays International Treasury Bond ETF	-2.24%	7.67%	-5.93%	5.10%	-19.72%	-8.67%	9.50%	5.58%	-1.85%	9.93%

Returns By Period

In the year-to-date period, AGZ achieves a 0.11% return, which is significantly higher than BWX's -2.24% return. Over the past 10 years, AGZ has outperformed BWX with an annualized return of 1.88%, while BWX has yielded a comparatively lower -1.19% annualized return.

AGZ

• 1D: -0.11%
• 1M: -0.84%
• YTD: 0.11%
• 6M: 1.24%
• 1Y: 4.08%
• 3Y*: 4.05%
• 5Y*: 1.23%
• 10Y*: 1.88%

BWX

• 1D: 1.06%
• 1M: -4.52%
• YTD: -2.24%
• 6M: -3.48%
• 1Y: 2.64%
• 3Y*: 0.23%
• 5Y*: -4.08%
• 10Y*: -1.19%

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

AGZ vs. BWX - Expense Ratio Comparison

AGZ has a 0.20% expense ratio, which is lower than BWX's 0.35% expense ratio.

BWX

SPDR Bloomberg Barclays International Treasury Bond ETF

AGZ

iShares Agency Bond ETF

Return for Risk

AGZ vs. BWX — Risk / Return Rank

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

AGZ

AGZ Risk / Return Rank: 82
AGZ Sharpe Ratio Rank: 78
AGZ Sortino Ratio Rank: 80
AGZ Omega Ratio Rank: 74
AGZ Calmar Ratio Rank: 91
AGZ Martin Ratio Rank: 87

BWX

BWX Risk / Return Rank: 21
BWX Sharpe Ratio Rank: 21
BWX Sortino Ratio Rank: 20
BWX Omega Ratio Rank: 19
BWX Calmar Ratio Rank: 23
BWX Martin Ratio Rank: 20

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.

AGZ vs. BWX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Agency Bond ETF (AGZ) and SPDR Bloomberg Barclays International Treasury Bond ETF (BWX). 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.

	AGZ	BWX	Difference
Sharpe ratio Return per unit of total volatility	1.44	0.30	+1.14
Sortino ratio Return per unit of downside risk	2.06	0.51	+1.54
Omega ratio Gain probability vs. loss probability	1.27	1.06	+0.21
Calmar ratio Return relative to maximum drawdown	3.22	0.44	+2.78
Martin ratio Return relative to average drawdown	10.47	1.07	+9.40
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AGZ vs. BWX - Sharpe Ratio Comparison

The current AGZ Sharpe Ratio is 1.44, which is higher than the BWX Sharpe Ratio of 0.30. The chart below compares the historical Sharpe Ratios of AGZ and BWX, 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

	AGZ	BWX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.44	0.30	+1.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.35	-0.43	+0.78
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.62	-0.14	+0.76
Sharpe Ratio (All Time) Calculated using the full available price history	0.69	0.05	+0.64

Correlation

The correlation between AGZ and BWX is 0.37, 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

AGZ vs. BWX - Dividend Comparison

AGZ's dividend yield for the trailing twelve months is around 3.76%, more than BWX's 2.28% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AGZ iShares Agency Bond ETF	3.76%	3.75%	3.48%	3.14%	1.56%	0.96%	2.25%	2.32%	2.15%	1.58%	1.52%	1.30%
BWX SPDR Bloomberg Barclays International Treasury Bond ETF	2.28%	2.19%	1.99%	1.63%	1.23%	0.93%	0.95%	1.16%	1.07%	0.46%	0.00%	0.00%

Drawdowns

AGZ vs. BWX - Drawdown Comparison

The maximum AGZ drawdown since its inception was -11.01%, smaller than the maximum BWX drawdown of -34.05%. Use the drawdown chart below to compare losses from any high point for AGZ and BWX.

Drawdown Indicators

	AGZ	BWX	Difference
Max Drawdown Largest peak-to-trough decline	-11.01%	-34.05%	+23.04%
Max Drawdown (1Y) Largest decline over 1 year	-1.30%	-6.16%	+4.86%
Max Drawdown (5Y) Largest decline over 5 years	-10.66%	-31.25%	+20.59%
Max Drawdown (10Y) Largest decline over 10 years	-11.01%	-34.05%	+23.04%
Current Drawdown Current decline from peak	-0.84%	-24.23%	+23.39%
Average Drawdown Average peak-to-trough decline	-1.62%	-9.92%	+8.30%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.40%	2.52%	-2.12%

Volatility

AGZ vs. BWX - Volatility Comparison

The current volatility for iShares Agency Bond ETF (AGZ) is 1.16%, while SPDR Bloomberg Barclays International Treasury Bond ETF (BWX) has a volatility of 3.37%. This indicates that AGZ experiences smaller price fluctuations and is considered to be less risky than BWX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AGZ	BWX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.16%	3.37%	-2.21%
Volatility (6M) Calculated over the trailing 6-month period	1.92%	5.11%	-3.19%
Volatility (1Y) Calculated over the trailing 1-year period	2.85%	8.85%	-6.00%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.53%	9.62%	-6.09%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.03%	8.64%	-5.61%