GLAG.L vs. IAAA.L
GLAG.L (SPDR Bloomberg Barclays Global Aggregate Bond UCITS USD unhedged) and IAAA.L (iShares Global AAA-AA Government Bond UCITS) are both Global Bonds funds tracking the Bloomberg Global Aggregate TR USD, from State Street and iShares respectively. Both are passively managed. Over the past 5 years, GLAG.L returned -1.75%/yr vs -3.01%/yr for IAAA.L. A 0.65 correlation means they provide meaningful diversification when combined. GLAG.L charges 0.10%/yr vs 0.20%/yr for IAAA.L.
Performance
GLAG.L vs. IAAA.L - Performance Comparison
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Returns By Period
In the year-to-date period, GLAG.L achieves a 0.02% return, which is significantly lower than IAAA.L's 0.13% return.
GLAG.L
- 1D
- 0.08%
- 1M
- 0.05%
- YTD
- 0.02%
- 6M
- 0.44%
- 1Y
- 2.30%
- 3Y*
- 3.39%
- 5Y*
- -1.75%
- 10Y*
- —
IAAA.L
- 1D
- 0.19%
- 1M
- 0.02%
- YTD
- 0.13%
- 6M
- 1.27%
- 1Y
- 2.00%
- 3Y*
- 3.96%
- 5Y*
- -3.01%
- 10Y*
- -0.36%
GLAG.L vs. IAAA.L - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | |
|---|---|---|---|---|---|---|---|---|---|
GLAG.L SPDR Bloomberg Barclays Global Aggregate Bond UCITS USD unhedged | 0.02% | 7.79% | -1.43% | 5.30% | -16.03% | -5.16% | 9.05% | 5.87% | -3.11% |
IAAA.L iShares Global AAA-AA Government Bond UCITS | 0.13% | 10.70% | -5.21% | 8.69% | -21.12% | -8.15% | 12.09% | 4.75% | -4.30% |
Correlation
The correlation between GLAG.L and IAAA.L is 0.60, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.60 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.61 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.63 |
Correlation (All Time) Calculated using the full available price history since Jan 31, 2018 | 0.65 |
The correlation between GLAG.L and IAAA.L has been stable across timeframes, ranging from 0.60 to 0.65 - a consistent structural relationship.
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Return for Risk
GLAG.L vs. IAAA.L — Risk / Return Rank
GLAG.L
IAAA.L
GLAG.L vs. IAAA.L - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for SPDR Bloomberg Barclays Global Aggregate Bond UCITS USD unhedged (GLAG.L) and iShares Global AAA-AA Government Bond UCITS (IAAA.L). 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.
| GLAG.L | IAAA.L | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.11 | ||
| Sortino ratioReturn per unit of downside risk | +0.13 | ||
| Omega ratioGain probability vs. loss probability | 1.08 | 1.07 | +0.01 |
| Calmar ratioReturn relative to maximum drawdown | 0.65 | 0.77 | -0.12 |
| Martin ratioReturn relative to average drawdown | 1.80 | 1.90 | -0.10 |
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
| GLAG.L | IAAA.L | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 0.46 | 0.36 | +0.11 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | -0.27 | -0.42 | +0.15 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | — | -0.06 | — |
Sharpe Ratio (All Time)Calculated using the full available price history | -0.01 | -0.07 | +0.06 |
Drawdowns
GLAG.L vs. IAAA.L - Drawdown Comparison
The maximum GLAG.L drawdown since its inception was -25.75%, smaller than the maximum IAAA.L drawdown of -32.79%. Use the drawdown chart below to compare losses from any high point for GLAG.L and IAAA.L.
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Drawdown Indicators
| GLAG.L | IAAA.L | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -25.75% | -32.79% | +7.04% |
Max Drawdown (1Y)Largest decline over 1 year | -3.53% | -4.11% | +0.58% |
Max Drawdown (3Y)Largest decline over 3 years | -6.86% | -10.21% | +3.35% |
Max Drawdown (5Y)Largest decline over 5 years | -24.25% | -30.57% | +6.32% |
Max Drawdown (10Y)Largest decline over 10 years | — | -32.79% | — |
Current DrawdownCurrent decline from peak | -10.98% | -17.30% | +6.32% |
Average DrawdownAverage peak-to-trough decline | -9.75% | -10.59% | +0.84% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.28% | 1.98% | -0.70% |
Volatility
GLAG.L vs. IAAA.L - Volatility Comparison
The current volatility for SPDR Bloomberg Barclays Global Aggregate Bond UCITS USD unhedged (GLAG.L) is 1.98%, while iShares Global AAA-AA Government Bond UCITS (IAAA.L) has a volatility of 2.59%. This indicates that GLAG.L experiences smaller price fluctuations and is considered to be less risky than IAAA.L based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| GLAG.L | IAAA.L | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.98% | 2.59% | -0.61% |
Volatility (6M)Calculated over the trailing 6-month period | 3.82% | 5.78% | -1.96% |
Volatility (1Y)Calculated over the trailing 1-year period | 4.96% | 8.83% | -3.87% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.50% | 11.26% | -4.76% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.79% | 9.36% | -3.57% |
GLAG.L vs. IAAA.L - Expense Ratio Comparison
GLAG.L has a 0.10% expense ratio, which is lower than IAAA.L'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%.
Dividends
GLAG.L vs. IAAA.L - Dividend Comparison
GLAG.L's dividend yield for the trailing twelve months is around 3.15%, more than IAAA.L's 2.69% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
GLAG.L SPDR Bloomberg Barclays Global Aggregate Bond UCITS USD unhedged | 3.15% | 3.00% | 2.80% | 2.02% | 1.48% | 1.24% | 1.47% | 0.84% | 0.00% | 0.00% | 0.00% | 0.00% |
IAAA.L iShares Global AAA-AA Government Bond UCITS | 2.69% | 2.46% | 2.37% | 1.52% | 0.76% | 0.49% | 0.56% | 0.88% | 0.94% | 0.77% | 0.89% | 1.08% |
Frequently Asked Questions
GLAG.L and IAAA.L have a correlation of 0.60, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
On fees, GLAG.L is cheaper at 0.10% per year. The better choice depends on whether you care most about return, fees, risk, or income.
GLAG.L is cheaper with a 0.10% expense ratio, compared with 0.20% for IAAA.L.
Both ETFs track Bloomberg Global Aggregate TR USD. They also come from different issuers: State Street and iShares. Their fees differ too: 0.10% for GLAG.L and 0.20% for IAAA.L.
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