IBTF vs. MBB
IBTF (iShares iBonds Dec 2025 Term Treasury ETF) and MBB (iShares MBS Bond ETF) are both exchange-traded funds - IBTF is a Government Bonds fund tracking the ICE 2025 Maturity US Treasury Index, while MBB is a Mortgage Backed Securities fund tracking the Barclays Capital U.S. MBS Index. Both are passively managed. Over the past 5 years, IBTF returned 0.96%/yr vs 0.42%/yr for MBB. A 0.55 correlation means they provide meaningful diversification when combined. IBTF charges 0.07%/yr vs 0.06%/yr for MBB.
Performance
IBTF vs. MBB - Performance Comparison
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Returns By Period
IBTF
- 1D
- 0.00%
- 1M
- 0.00%
- YTD
- 0.00%
- 6M
- 0.00%
- 1Y
- 1.92%
- 3Y*
- 3.74%
- 5Y*
- 0.96%
- 10Y*
- —
MBB
- 1D
- -0.24%
- 1M
- 0.53%
- YTD
- 0.73%
- 6M
- 0.86%
- 1Y
- 5.95%
- 3Y*
- 4.31%
- 5Y*
- 0.42%
- 10Y*
- 1.29%
IBTF vs. MBB - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | |
|---|---|---|---|---|---|---|---|
IBTF iShares iBonds Dec 2025 Term Treasury ETF | 0.00% | 3.81% | 4.60% | 4.12% | -6.39% | -2.31% | 3.85% |
MBB iShares MBS Bond ETF | 0.73% | 8.38% | 1.31% | 5.01% | -11.74% | -1.43% | 2.67% |
Correlation
The correlation between IBTF and MBB is -0.00, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | -0.00 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.39 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.60 |
Correlation (All Time) Calculated using the full available price history since Feb 28, 2020 | 0.55 |
The correlation between IBTF and MBB shifts across timeframes, from -0.00 (1 year) to 0.60 (5 years), reflecting how their relationship changes across market environments.
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Return for Risk
IBTF vs. MBB — Risk / Return Rank
IBTF
MBB
IBTF vs. MBB - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Dec 2025 Term Treasury ETF (IBTF) and iShares MBS Bond ETF (MBB). 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.
| IBTF | MBB | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +5.41 | ||
| Sortino ratioReturn per unit of downside risk | +17.47 | ||
| Omega ratioGain probability vs. loss probability | 6.26 | 1.24 | +5.02 |
| Calmar ratioReturn relative to maximum drawdown | 53.32 | 2.03 | +51.29 |
| Martin ratioReturn relative to average drawdown | 269.65 | 6.36 | +263.29 |
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Drawdowns
IBTF vs. MBB - Drawdown Comparison
The maximum IBTF drawdown since its inception was -10.45%, smaller than the maximum MBB drawdown of -17.64%. Use the drawdown chart below to compare losses from any high point for IBTF and MBB.
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Drawdown Indicators
| IBTF | MBB | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -10.45% | -17.64% | +7.19% |
Max Drawdown (1Y)Largest decline over 1 year | -0.04% | -2.94% | +2.90% |
Max Drawdown (3Y)Largest decline over 3 years | -0.46% | -7.68% | +7.22% |
Max Drawdown (5Y)Largest decline over 5 years | -9.53% | -17.19% | +7.66% |
Max Drawdown (10Y)Largest decline over 10 years | — | -17.64% | — |
Current DrawdownCurrent decline from peak | 0.00% | -1.38% | +1.38% |
Average DrawdownAverage peak-to-trough decline | -3.30% | -2.34% | -0.96% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.01% | 0.94% | -0.93% |
Volatility
IBTF vs. MBB - Volatility Comparison
The current volatility for iShares iBonds Dec 2025 Term Treasury ETF (IBTF) is 0.00%, while iShares MBS Bond ETF (MBB) has a volatility of 1.27%. This indicates that IBTF experiences smaller price fluctuations and is considered to be less risky than MBB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| IBTF | MBB | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.00% | 1.27% | -1.27% |
Volatility (6M)Calculated over the trailing 6-month period | 0.15% | 3.33% | -3.18% |
Volatility (1Y)Calculated over the trailing 1-year period | 0.34% | 4.47% | -4.13% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 2.37% | 6.83% | -4.46% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 2.55% | 5.32% | -2.77% |
IBTF vs. MBB - Expense Ratio Comparison
IBTF has a 0.07% expense ratio, which is higher than MBB's 0.06% 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
IBTF vs. MBB - Dividend Comparison
IBTF's dividend yield for the trailing twelve months is around 2.08%, less than MBB's 4.27% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
IBTF iShares iBonds Dec 2025 Term Treasury ETF | 2.08% | 3.83% | 4.32% | 4.03% | 1.93% | 0.57% | 0.59% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
MBB iShares MBS Bond ETF | 4.27% | 4.21% | 3.94% | 3.40% | 2.31% | 1.05% | 2.10% | 2.77% | 2.64% | 2.23% | 2.58% | 2.66% |
Frequently Asked Questions
IBTF and MBB have a correlation of -0.00, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MBB has higher volatility (1.27%) compared to IBTF (0.00%). In terms of maximum drawdown, IBTF dropped -10.45% vs MBB's -17.64%.
On 5-year performance, IBTF leads with 0.96% vs 0.42% for MBB. On fees, MBB is cheaper at 0.06% per year. On volatility, IBTF has been the lower-risk option at 0.00%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 5-year period, IBTF has performed better with a 0.96% return vs 0.42%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
MBB is cheaper with a 0.06% expense ratio, compared with 0.07% for IBTF.
MBB has the higher dividend yield at 4.27%, compared with 2.08% for IBTF.
IBTF is categorized as Government Bonds, while MBB is Mortgage Backed Securities. IBTF tracks ICE 2025 Maturity US Treasury Index, while MBB tracks Barclays Capital U.S. MBS Index. Their fees differ too: 0.07% for IBTF and 0.06% for MBB.
IBTF currently has the higher Sharpe Ratio (6.75 vs 1.34), 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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