IBGL vs. SPTL
IBGL (iShares iBonds Dec 2055 Term Treasury ETF) and SPTL (SPDR Portfolio Long Term Treasury ETF) are both Government Bonds funds - IBGL tracks the ICE 2055 Maturity US Treasury Index while SPTL tracks the Bloomberg Long U.S. Treasury Index. Both are passively managed. Over the past year, IBGL returned 4.56% vs 5.22% for SPTL. With a 0.99 correlation, they move nearly in lockstep. IBGL charges 0.07%/yr vs 0.03%/yr for SPTL.
Performance
IBGL vs. SPTL - Performance Comparison
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Returns By Period
In the year-to-date period, IBGL achieves a -0.23% return, which is significantly higher than SPTL's -0.38% return.
IBGL
- 1D
- -0.35%
- 1M
- 0.74%
- YTD
- -0.23%
- 6M
- -1.85%
- 1Y
- 4.56%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
SPTL
- 1D
- -0.38%
- 1M
- 0.71%
- YTD
- -0.38%
- 6M
- -1.67%
- 1Y
- 5.22%
- 3Y*
- -0.70%
- 5Y*
- -5.32%
- 10Y*
- -1.12%
IBGL vs. SPTL - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
IBGL iShares iBonds Dec 2055 Term Treasury ETF | -0.23% | 0.99% |
SPTL SPDR Portfolio Long Term Treasury ETF | -0.38% | 2.33% |
Correlation
The correlation between IBGL and SPTL is 0.99 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.99 |
Correlation (All Time) Calculated using the full available price history since Mar 27, 2025 | 0.99 |
The correlation between IBGL and SPTL has been stable across timeframes, ranging from 0.99 to 0.99 - a consistent structural relationship.
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Return for Risk
IBGL vs. SPTL — Risk / Return Rank
IBGL
SPTL
IBGL vs. SPTL - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Dec 2055 Term Treasury ETF (IBGL) and SPDR Portfolio Long Term Treasury ETF (SPTL). 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.
| IBGL | SPTL | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.09 | ||
| Sortino ratioReturn per unit of downside risk | -0.13 | ||
| Omega ratioGain probability vs. loss probability | 1.09 | 1.10 | -0.02 |
| Calmar ratioReturn relative to maximum drawdown | 0.63 | 0.74 | -0.11 |
| Martin ratioReturn relative to average drawdown | 1.58 | 1.94 | -0.36 |
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
| IBGL | SPTL | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 0.49 | 0.59 | -0.09 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | — | -0.37 | — |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | — | -0.08 | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.06 | 0.24 | -0.18 |
Drawdowns
IBGL vs. SPTL - Drawdown Comparison
The maximum IBGL drawdown since its inception was -9.37%, smaller than the maximum SPTL drawdown of -46.20%. Use the drawdown chart below to compare losses from any high point for IBGL and SPTL.
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Drawdown Indicators
| IBGL | SPTL | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -9.37% | -46.20% | +36.83% |
Max Drawdown (1Y)Largest decline over 1 year | -7.23% | -7.04% | -0.19% |
Max Drawdown (3Y)Largest decline over 3 years | — | -17.55% | — |
Max Drawdown (5Y)Largest decline over 5 years | — | -41.02% | — |
Max Drawdown (10Y)Largest decline over 10 years | — | -46.20% | — |
Current DrawdownCurrent decline from peak | -4.38% | -36.87% | +32.49% |
Average DrawdownAverage peak-to-trough decline | -4.03% | -14.24% | +10.21% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.89% | 2.69% | +0.20% |
Volatility
IBGL vs. SPTL - Volatility Comparison
iShares iBonds Dec 2055 Term Treasury ETF (IBGL) and SPDR Portfolio Long Term Treasury ETF (SPTL) have volatilities of 2.67% and 2.63%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| IBGL | SPTL | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.67% | 2.63% | +0.04% |
Volatility (6M)Calculated over the trailing 6-month period | 6.12% | 5.97% | +0.15% |
Volatility (1Y)Calculated over the trailing 1-year period | 9.28% | 8.92% | +0.36% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 10.53% | 14.63% | -4.10% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 10.53% | 13.95% | -3.42% |
IBGL vs. SPTL - Expense Ratio Comparison
IBGL has a 0.07% expense ratio, which is higher than SPTL's 0.03% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
IBGL vs. SPTL - Dividend Comparison
IBGL's dividend yield for the trailing twelve months is around 4.70%, more than SPTL's 4.21% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
IBGL iShares iBonds Dec 2055 Term Treasury ETF | 4.70% | 3.52% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
SPTL SPDR Portfolio Long Term Treasury ETF | 4.21% | 4.12% | 4.03% | 3.24% | 2.75% | 1.68% | 1.71% | 2.45% | 2.69% | 2.53% | 2.56% | 2.60% |
Frequently Asked Questions
With a correlation of 0.99, IBGL and SPTL move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
IBGL has higher volatility (2.67%) compared to SPTL (2.63%). In terms of maximum drawdown, IBGL dropped -9.37% vs SPTL's -46.20%.
On 1-year performance, SPTL leads with 5.22% vs 4.56% for IBGL. On fees, SPTL is cheaper at 0.03% per year. Their volatility is very similar. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 1-year period, SPTL has performed better with a 5.22% return vs 4.56%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
SPTL is cheaper with a 0.03% expense ratio, compared with 0.07% for IBGL.
IBGL has the higher dividend yield at 4.70%, compared with 4.21% for SPTL.
IBGL tracks ICE 2055 Maturity US Treasury Index, while SPTL tracks Bloomberg Long U.S. Treasury Index. They also come from different issuers: iShares and State Street. Their fees differ too: 0.07% for IBGL and 0.03% for SPTL.
SPTL currently has the higher Sharpe Ratio (0.59 vs 0.49), 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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