IAGG vs. BWX

Last updated Apr 1, 2026

Compare and contrast key facts about iShares Core International Aggregate Bond ETF (IAGG) and SPDR Bloomberg Barclays International Treasury Bond ETF (BWX).

IAGG and BWX are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. IAGG is a passively managed fund by iShares that tracks the performance of the Bloomberg Global Aggregate ex USD 10% Issuer Capped (Hedged) Index. It was launched on Nov 10, 2015. 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 IAGG 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

IAGG vs. BWX - Performance Comparison

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

IAGG vs. BWX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IAGG iShares Core International Aggregate Bond ETF	0.27%	3.26%	4.51%	8.49%	-10.86%	-1.87%	4.63%	7.99%	3.38%	2.09%
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, IAGG achieves a 0.27% return, which is significantly higher than BWX's -2.24% return. Over the past 10 years, IAGG has outperformed BWX with an annualized return of 2.23%, while BWX has yielded a comparatively lower -1.19% annualized return.

IAGG

• 1D: 0.46%
• 1M: -1.61%
• YTD: 0.27%
• 6M: 0.89%
• 1Y: 3.40%
• 3Y*: 4.48%
• 5Y*: 0.97%
• 10Y*: 2.23%

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)

IAGG vs. BWX - Expense Ratio Comparison

IAGG has a 0.07% expense ratio, which is lower than BWX's 0.35% expense ratio.

BWX

SPDR Bloomberg Barclays International Treasury Bond ETF

IAGG

iShares Core International Aggregate Bond ETF

Return for Risk

IAGG vs. BWX — Risk / Return Rank

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

IAGG

IAGG Risk / Return Rank: 69
IAGG Sharpe Ratio Rank: 75
IAGG Sortino Ratio Rank: 75
IAGG Omega Ratio Rank: 67
IAGG Calmar Ratio Rank: 63
IAGG Martin Ratio Rank: 68

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.

IAGG vs. BWX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Core International Aggregate Bond ETF (IAGG) 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.

	IAGG	BWX	Difference
Sharpe ratio Return per unit of total volatility	1.30	0.30	+1.00
Sortino ratio Return per unit of downside risk	1.84	0.51	+1.32
Omega ratio Gain probability vs. loss probability	1.23	1.06	+0.17
Calmar ratio Return relative to maximum drawdown	1.47	0.44	+1.04
Martin ratio Return relative to average drawdown	6.38	1.07	+5.31
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IAGG vs. BWX - Sharpe Ratio Comparison

The current IAGG Sharpe Ratio is 1.30, which is higher than the BWX Sharpe Ratio of 0.30. The chart below compares the historical Sharpe Ratios of IAGG 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

	IAGG	BWX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.30	0.30	+1.00
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.22	-0.43	+0.65
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.55	-0.14	+0.69
Sharpe Ratio (All Time) Calculated using the full available price history	0.61	0.05	+0.56

Correlation

The correlation between IAGG and BWX is 0.50, which is considered to be moderate. This suggests that the two assets have some degree of positive relationship in their price movements. Moderate correlation can be acceptable for portfolio diversification, offering a balance between risk and potential returns.

Dividends

IAGG vs. BWX - Dividend Comparison

IAGG's dividend yield for the trailing twelve months is around 3.29%, more than BWX's 2.28% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IAGG iShares Core International Aggregate Bond ETF	3.29%	3.08%	4.28%	3.55%	2.27%	1.16%	1.95%	2.82%	3.02%	1.74%	1.56%	0.13%
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

IAGG vs. BWX - Drawdown Comparison

The maximum IAGG drawdown since its inception was -13.88%, smaller than the maximum BWX drawdown of -34.05%. Use the drawdown chart below to compare losses from any high point for IAGG and BWX.

Drawdown Indicators

	IAGG	BWX	Difference
Max Drawdown Largest peak-to-trough decline	-13.88%	-34.05%	+20.17%
Max Drawdown (1Y) Largest decline over 1 year	-2.32%	-6.16%	+3.84%
Max Drawdown (5Y) Largest decline over 5 years	-13.57%	-31.25%	+17.68%
Max Drawdown (10Y) Largest decline over 10 years	-13.88%	-34.05%	+20.17%
Current Drawdown Current decline from peak	-1.61%	-24.23%	+22.62%
Average Drawdown Average peak-to-trough decline	-2.87%	-9.92%	+7.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.54%	2.52%	-1.98%

Volatility

IAGG vs. BWX - Volatility Comparison

The current volatility for iShares Core International Aggregate Bond ETF (IAGG) is 1.47%, while SPDR Bloomberg Barclays International Treasury Bond ETF (BWX) has a volatility of 3.37%. This indicates that IAGG 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

	IAGG	BWX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.47%	3.37%	-1.90%
Volatility (6M) Calculated over the trailing 6-month period	1.91%	5.11%	-3.20%
Volatility (1Y) Calculated over the trailing 1-year period	2.62%	8.85%	-6.23%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.47%	9.62%	-5.15%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.03%	8.64%	-4.61%