IBTI vs. ZROZ
IBTI (iShares iBonds Dec 2028 Term Treasury ETF) and ZROZ (PIMCO 25+ Year Zero Coupon US Treasury Index Fund) are both Government Bonds funds - IBTI tracks the ICE 2028 Maturity US Treasury Index while ZROZ tracks the ICE BofA Long U.S. Treasury Principal STRIPS Index. Both are passively managed. Over the past 5 years, IBTI returned 0.25%/yr vs -11.27%/yr for ZROZ. A 0.73 correlation means they provide meaningful diversification when combined. IBTI charges 0.07%/yr vs 0.15%/yr for ZROZ.
Performance
IBTI vs. ZROZ - Performance Comparison
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Returns By Period
In the year-to-date period, IBTI achieves a 0.45% return, which is significantly lower than ZROZ's 3.38% return.
IBTI
- 1D
- 0.14%
- 1M
- 0.32%
- YTD
- 0.45%
- 6M
- 0.58%
- 1Y
- 3.03%
- 3Y*
- 3.91%
- 5Y*
- 0.25%
- 10Y*
- —
ZROZ
- 1D
- 2.17%
- 1M
- 6.83%
- YTD
- 3.38%
- 6M
- 1.48%
- 1Y
- 4.12%
- 3Y*
- -6.82%
- 5Y*
- -11.27%
- 10Y*
- -3.96%
IBTI vs. ZROZ - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | |
|---|---|---|---|---|---|---|---|
IBTI iShares iBonds Dec 2028 Term Treasury ETF | 0.45% | 6.15% | 2.52% | 4.65% | -11.32% | -3.50% | 3.97% |
ZROZ PIMCO 25+ Year Zero Coupon US Treasury Index Fund | 3.38% | -1.84% | -16.18% | 1.19% | -41.28% | -5.22% | 5.49% |
Correlation
The correlation between IBTI and ZROZ is 0.55, 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 | 0.55 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.68 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.73 |
Correlation (All Time) Calculated using the full available price history since Feb 28, 2020 | 0.73 |
The correlation between IBTI and ZROZ shifts across timeframes, from 0.55 (1 year) to 0.73 (all time), reflecting how their relationship changes across market environments.
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Return for Risk
IBTI vs. ZROZ — Risk / Return Rank
IBTI
ZROZ
IBTI vs. ZROZ - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Dec 2028 Term Treasury ETF (IBTI) and PIMCO 25+ Year Zero Coupon US Treasury Index Fund (ZROZ). 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.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| IBTI | ZROZ | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +1.54 | ||
| Sortino ratioReturn per unit of downside risk | +2.42 | ||
| Omega ratioGain probability vs. loss probability | 1.36 | 1.05 | +0.30 |
| Calmar ratioReturn relative to maximum drawdown | 2.77 | 0.29 | +2.48 |
| Martin ratioReturn relative to average drawdown | 8.88 | 0.64 | +8.23 |
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Drawdowns
IBTI vs. ZROZ - Drawdown Comparison
The maximum IBTI drawdown since its inception was -18.45%, smaller than the maximum ZROZ drawdown of -62.93%. Use the drawdown chart below to compare losses from any high point for IBTI and ZROZ.
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Drawdown Indicators
| IBTI | ZROZ | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.45% | -62.93% | +44.48% |
Max Drawdown (1Y)Largest decline over 1 year | -1.10% | -14.02% | +12.92% |
Max Drawdown (3Y)Largest decline over 3 years | -3.24% | -28.62% | +25.38% |
Max Drawdown (5Y)Largest decline over 5 years | -16.18% | -57.98% | +41.80% |
Max Drawdown (10Y)Largest decline over 10 years | — | -62.93% | — |
Current DrawdownCurrent decline from peak | -3.78% | -58.13% | +54.35% |
Average DrawdownAverage peak-to-trough decline | -8.21% | -24.16% | +15.95% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.34% | 6.41% | -6.07% |
Volatility
IBTI vs. ZROZ - Volatility Comparison
The current volatility for iShares iBonds Dec 2028 Term Treasury ETF (IBTI) is 0.49%, while PIMCO 25+ Year Zero Coupon US Treasury Index Fund (ZROZ) has a volatility of 4.01%. This indicates that IBTI experiences smaller price fluctuations and is considered to be less risky than ZROZ based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| IBTI | ZROZ | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.49% | 4.01% | -3.52% |
Volatility (6M)Calculated over the trailing 6-month period | 1.11% | 10.93% | -9.82% |
Volatility (1Y)Calculated over the trailing 1-year period | 1.69% | 15.88% | -14.19% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.00% | 23.85% | -18.85% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.15% | 22.04% | -16.89% |
IBTI vs. ZROZ - Expense Ratio Comparison
IBTI has a 0.07% expense ratio, which is lower than ZROZ's 0.15% 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
IBTI vs. ZROZ - Dividend Comparison
IBTI's dividend yield for the trailing twelve months is around 3.80%, less than ZROZ's 4.93% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
IBTI iShares iBonds Dec 2028 Term Treasury ETF | 3.80% | 3.87% | 3.92% | 3.27% | 1.70% | 0.90% | 0.56% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
ZROZ PIMCO 25+ Year Zero Coupon US Treasury Index Fund | 4.93% | 4.96% | 4.58% | 3.52% | 2.76% | 1.60% | 1.68% | 2.22% | 2.06% | 2.53% | 3.00% | 2.98% |
Frequently Asked Questions
IBTI and ZROZ have a correlation of 0.55, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
ZROZ has higher volatility (4.01%) compared to IBTI (0.49%). In terms of maximum drawdown, IBTI dropped -18.45% vs ZROZ's -62.93%.
On 5-year performance, IBTI leads with 0.25% vs -11.27% for ZROZ. On fees, IBTI is cheaper at 0.07% per year. On volatility, IBTI has been the lower-risk option at 0.49%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 5-year period, IBTI has performed better with a 0.25% return vs -11.27%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
IBTI is cheaper with a 0.07% expense ratio, compared with 0.15% for ZROZ.
ZROZ has the higher dividend yield at 4.93%, compared with 3.80% for IBTI.
IBTI tracks ICE 2028 Maturity US Treasury Index, while ZROZ tracks ICE BofA Long U.S. Treasury Principal STRIPS Index. They also come from different issuers: iShares and PIMCO. Their fees differ too: 0.07% for IBTI and 0.15% for ZROZ.
IBTI currently has the higher Sharpe Ratio (1.80 vs 0.26), 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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