MBB vs. COMT
MBB (iShares MBS Bond ETF) and COMT (iShares GSCI Commodity Dynamic Roll Strategy ETF) are both exchange-traded funds - MBB is a Mortgage Backed Securities fund tracking the Barclays Capital U.S. MBS Index, while COMT is a Commodities fund tracking the S&P GSCI Dynamic Roll (USD) Total Return Index. Both are passively managed. Over the past 10 years, MBB returned 1.34%/yr vs 7.70%/yr for COMT. At a correlation of -0.11, they often move in opposite directions. MBB charges 0.06%/yr vs 0.48%/yr for COMT.
Performance
MBB vs. COMT - Performance Comparison
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Returns By Period
In the year-to-date period, MBB achieves a 1.26% return, which is significantly lower than COMT's 20.95% return. Over the past 10 years, MBB has underperformed COMT with an annualized return of 1.34%, while COMT has yielded a comparatively higher 7.70% annualized return.
MBB
- 1D
- 0.43%
- 1M
- 1.07%
- YTD
- 1.26%
- 6M
- 1.05%
- 1Y
- 5.71%
- 3Y*
- 4.50%
- 5Y*
- 0.54%
- 10Y*
- 1.34%
COMT
- 1D
- -2.37%
- 1M
- -14.00%
- YTD
- 20.95%
- 6M
- 19.91%
- 1Y
- 25.37%
- 3Y*
- 11.11%
- 5Y*
- 10.23%
- 10Y*
- 7.70%
MBB vs. COMT - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
MBB iShares MBS Bond ETF | 1.26% | 8.38% | 1.31% | 5.01% | -11.74% | -1.43% | 4.08% | 6.18% | 0.82% | 2.49% |
COMT iShares GSCI Commodity Dynamic Roll Strategy ETF | 20.95% | 6.07% | 5.96% | -6.56% | 19.45% | 36.88% | -18.66% | 10.81% | -6.67% | 11.70% |
Correlation
The correlation between MBB and COMT is -0.32, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | -0.32 |
Correlation (3Y) Calculated over the trailing 3-year period | -0.17 |
Correlation (5Y) Calculated over the trailing 5-year period | -0.10 |
Correlation (10Y) Calculated over the trailing 10-year period | -0.10 |
Correlation (All Time) Calculated using the full available price history since Oct 16, 2014 | -0.11 |
Over the past year, the inverse relationship between MBB and COMT has strengthened: their correlation has moved from -0.11 to -0.32, meaning they now move in opposite directions more often than their long-term average.
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Return for Risk
MBB vs. COMT — Risk / Return Rank
MBB
COMT
MBB vs. COMT - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares MBS Bond ETF (MBB) and iShares GSCI Commodity Dynamic Roll Strategy ETF (COMT). 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.
| MBB | COMT | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.08 | ||
| Sortino ratioReturn per unit of downside risk | +0.17 | ||
| Omega ratioGain probability vs. loss probability | 1.23 | 1.22 | +0.01 |
| Calmar ratioReturn relative to maximum drawdown | 1.95 | 1.45 | +0.50 |
| Martin ratioReturn relative to average drawdown | 6.07 | 6.71 | -0.64 |
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Drawdowns
MBB vs. COMT - Drawdown Comparison
The maximum MBB drawdown since its inception was -17.64%, smaller than the maximum COMT drawdown of -51.89%. Use the drawdown chart below to compare losses from any high point for MBB and COMT.
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Drawdown Indicators
| MBB | COMT | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -17.64% | -51.89% | +34.25% |
Max Drawdown (1Y)Largest decline over 1 year | -2.94% | -17.57% | +14.63% |
Max Drawdown (3Y)Largest decline over 3 years | -7.68% | -17.57% | +9.89% |
Max Drawdown (5Y)Largest decline over 5 years | -17.19% | -29.00% | +11.81% |
Max Drawdown (10Y)Largest decline over 10 years | -17.64% | -39.22% | +21.58% |
Current DrawdownCurrent decline from peak | -0.85% | -17.57% | +16.72% |
Average DrawdownAverage peak-to-trough decline | -2.34% | -24.00% | +21.66% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.94% | 3.79% | -2.85% |
Volatility
MBB vs. COMT - Volatility Comparison
The current volatility for iShares MBS Bond ETF (MBB) is 1.32%, while iShares GSCI Commodity Dynamic Roll Strategy ETF (COMT) has a volatility of 5.32%. This indicates that MBB experiences smaller price fluctuations and is considered to be less risky than COMT based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MBB | COMT | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.32% | 5.32% | -4.00% |
Volatility (6M)Calculated over the trailing 6-month period | 3.34% | 19.40% | -16.06% |
Volatility (1Y)Calculated over the trailing 1-year period | 4.47% | 21.28% | -16.81% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.83% | 21.15% | -14.32% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.32% | 18.87% | -13.55% |
MBB vs. COMT - Expense Ratio Comparison
MBB has a 0.06% expense ratio, which is lower than COMT's 0.48% expense ratio.
Dividends
MBB vs. COMT - Dividend Comparison
MBB's dividend yield for the trailing twelve months is around 4.25%, less than COMT's 6.40% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
COMT iShares GSCI Commodity Dynamic Roll Strategy ETF | 6.40% | 7.74% | 4.90% | 5.19% | 29.79% | 17.79% | 0.36% | 2.61% | 11.65% | 5.16% | 0.52% | 1.44% |
MBB iShares MBS Bond ETF | 4.25% | 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
MBB and COMT have a correlation of -0.32, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
COMT has higher volatility (5.32%) compared to MBB (1.32%). In terms of maximum drawdown, MBB dropped -17.64% vs COMT's -51.89%.
On 10-year performance, COMT leads with 7.70% vs 1.34% for MBB. On fees, MBB is cheaper at 0.06% per year. On volatility, MBB has been the lower-risk option at 1.32%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 10-year period, COMT has performed better with a 7.70% return vs 1.34%. 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 0.48% for COMT.
COMT has the higher dividend yield at 6.40%, compared with 4.25% for MBB.
MBB is categorized as Mortgage Backed Securities, while COMT is Commodities. MBB tracks Barclays Capital U.S. MBS Index, while COMT tracks S&P GSCI Dynamic Roll (USD) Total Return Index. Their fees differ too: 0.06% for MBB and 0.48% for COMT.
MBB currently has the higher Sharpe Ratio (1.29 vs 1.21), 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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