CMBS vs. MBB
CMBS (iShares CMBS ETF) and MBB (iShares MBS Bond ETF) are both Mortgage Backed Securities funds from iShares - CMBS tracks the Barclays Capital U.S. CMBS (ERISA Only) Index while MBB tracks the Barclays Capital U.S. MBS Index. Both are passively managed. Over the past 10 years, CMBS returned 2.06%/yr vs 1.30%/yr for MBB. A 0.50 correlation means they provide meaningful diversification when combined. CMBS charges 0.25%/yr vs 0.06%/yr for MBB.
Performance
CMBS vs. MBB - Performance Comparison
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Returns By Period
In the year-to-date period, CMBS achieves a 0.14% return, which is significantly lower than MBB's 0.58% return. Over the past 10 years, CMBS has outperformed MBB with an annualized return of 2.06%, while MBB has yielded a comparatively lower 1.30% annualized return.
CMBS
- 1D
- -0.04%
- 1M
- -0.05%
- YTD
- 0.14%
- 6M
- 0.28%
- 1Y
- 4.26%
- 3Y*
- 5.15%
- 5Y*
- 0.79%
- 10Y*
- 2.06%
MBB
- 1D
- -0.23%
- 1M
- 0.31%
- YTD
- 0.58%
- 6M
- 0.71%
- 1Y
- 6.76%
- 3Y*
- 4.36%
- 5Y*
- 0.34%
- 10Y*
- 1.30%
CMBS vs. MBB - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
CMBS iShares CMBS ETF | 0.14% | 7.67% | 4.27% | 5.06% | -11.21% | -1.82% | 7.86% | 7.94% | 0.77% | 2.95% |
MBB iShares MBS Bond ETF | 0.58% | 8.38% | 1.31% | 5.01% | -11.74% | -1.43% | 4.08% | 6.18% | 0.82% | 2.49% |
Correlation
The correlation between CMBS and MBB is 0.35, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.35 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.54 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.63 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.55 |
Correlation (All Time) Calculated using the full available price history since Feb 17, 2012 | 0.50 |
The correlation between CMBS and MBB shifts across timeframes, from 0.35 (1 year) to 0.63 (5 years), reflecting how their relationship changes across market environments.
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Return for Risk
CMBS vs. MBB — Risk / Return Rank
CMBS
MBB
CMBS vs. MBB - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares CMBS ETF (CMBS) 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.
| CMBS | MBB | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.35 | ||
| Sortino ratioReturn per unit of downside risk | -0.45 | ||
| Omega ratioGain probability vs. loss probability | 1.20 | 1.27 | -0.07 |
| Calmar ratioReturn relative to maximum drawdown | 1.76 | 2.31 | -0.55 |
| Martin ratioReturn relative to average drawdown | 4.90 | 7.64 | -2.74 |
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
| CMBS | MBB | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.16 | 1.51 | -0.35 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.15 | 0.05 | +0.10 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.36 | 0.25 | +0.11 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.43 | 0.58 | -0.15 |
Drawdowns
CMBS vs. MBB - Drawdown Comparison
The maximum CMBS drawdown since its inception was -15.87%, smaller than the maximum MBB drawdown of -17.64%. Use the drawdown chart below to compare losses from any high point for CMBS and MBB.
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Drawdown Indicators
| CMBS | MBB | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -15.87% | -17.64% | +1.77% |
Max Drawdown (1Y)Largest decline over 1 year | -2.44% | -2.94% | +0.50% |
Max Drawdown (3Y)Largest decline over 3 years | -3.29% | -7.68% | +4.39% |
Max Drawdown (5Y)Largest decline over 5 years | -15.87% | -17.19% | +1.32% |
Max Drawdown (10Y)Largest decline over 10 years | -15.87% | -17.64% | +1.77% |
Current DrawdownCurrent decline from peak | -1.77% | -1.52% | -0.25% |
Average DrawdownAverage peak-to-trough decline | -2.95% | -2.35% | -0.60% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.87% | 0.89% | -0.02% |
Volatility
CMBS vs. MBB - Volatility Comparison
The current volatility for iShares CMBS ETF (CMBS) is 1.11%, while iShares MBS Bond ETF (MBB) has a volatility of 1.59%. This indicates that CMBS 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
| CMBS | MBB | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.11% | 1.59% | -0.48% |
Volatility (6M)Calculated over the trailing 6-month period | 2.82% | 3.23% | -0.41% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.71% | 4.51% | -0.80% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.31% | 6.81% | -1.50% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.77% | 5.31% | +0.46% |
CMBS vs. MBB - Expense Ratio Comparison
CMBS has a 0.25% 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
CMBS vs. MBB - Dividend Comparison
CMBS's dividend yield for the trailing twelve months is around 3.58%, less than MBB's 4.28% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
CMBS iShares CMBS ETF | 3.58% | 3.45% | 3.31% | 2.97% | 2.65% | 2.46% | 2.83% | 2.74% | 2.70% | 2.50% | 2.29% | 2.31% |
MBB iShares MBS Bond ETF | 4.28% | 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
CMBS and MBB have a correlation of 0.35, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MBB has higher volatility (1.59%) compared to CMBS (1.11%). In terms of maximum drawdown, CMBS dropped -15.87% vs MBB's -17.64%.
On 10-year performance, CMBS leads with 2.06% vs 1.30% for MBB. On fees, MBB is cheaper at 0.06% per year. On volatility, CMBS has been the lower-risk option at 1.11%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 10-year period, CMBS has performed better with a 2.06% return vs 1.30%. 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 0.25% for CMBS.
MBB has the higher dividend yield at 4.28%, compared with 3.58% for CMBS.
CMBS tracks Barclays Capital U.S. CMBS (ERISA Only) Index, while MBB tracks Barclays Capital U.S. MBS Index. Their fees differ too: 0.25% for CMBS and 0.06% for MBB.
MBB currently has the higher Sharpe Ratio (1.51 vs 1.16), 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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