MBB vs. PMBS
Compare and contrast key facts about iShares MBS Bond ETF (MBB) and PIMCO Mortgage-Backed Securities Active Exchange-Traded Fund (PMBS).
MBB and PMBS are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. MBB is a passively managed fund by iShares that tracks the performance of the Barclays Capital U.S. MBS Index. It was launched on Mar 16, 2007. PMBS is an actively managed fund by PIMCO. It was launched on Jul 31, 1997.
Performance
MBB vs. PMBS - Performance Comparison
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MBB vs. PMBS - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | |
|---|---|---|---|
MBB iShares MBS Bond ETF | 0.41% | 8.38% | -3.33% |
PMBS PIMCO Mortgage-Backed Securities Active Exchange-Traded Fund | 0.61% | 8.92% | -2.75% |
Returns By Period
In the year-to-date period, MBB achieves a 0.41% return, which is significantly lower than PMBS's 0.61% return.
MBB
- 1D
- 0.24%
- 1M
- -1.69%
- YTD
- 0.41%
- 6M
- 1.92%
- 1Y
- 5.63%
- 3Y*
- 4.09%
- 5Y*
- 0.40%
- 10Y*
- 1.34%
PMBS
- 1D
- 0.33%
- 1M
- -1.84%
- YTD
- 0.61%
- 6M
- 2.40%
- 1Y
- 6.20%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
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MBB vs. PMBS - Expense Ratio Comparison
MBB has a 0.06% expense ratio, which is lower than PMBS's 0.71% expense ratio.
Return for Risk
MBB vs. PMBS — Risk / Return Rank
MBB
PMBS
MBB vs. PMBS - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares MBS Bond ETF (MBB) and PIMCO Mortgage-Backed Securities Active Exchange-Traded Fund (PMBS). 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.
| MBB | PMBS | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 1.14 | 1.31 | -0.17 |
Sortino ratioReturn per unit of downside risk | 1.63 | 1.86 | -0.23 |
Omega ratioGain probability vs. loss probability | 1.20 | 1.24 | -0.03 |
Calmar ratioReturn relative to maximum drawdown | 2.18 | 2.09 | +0.09 |
Martin ratioReturn relative to average drawdown | 6.00 | 6.06 | -0.05 |
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
| MBB | PMBS | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.14 | 1.31 | -0.17 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.06 | — | — |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.25 | — | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.59 | 0.87 | -0.29 |
Correlation
The correlation between MBB and PMBS is 0.96, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.
Dividends
MBB vs. PMBS - Dividend Comparison
MBB's dividend yield for the trailing twelve months is around 4.22%, less than PMBS's 4.94% yield.
| TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MBB iShares MBS Bond ETF | 4.22% | 4.21% | 3.94% | 3.40% | 2.31% | 1.05% | 2.10% | 2.77% | 2.64% | 2.23% | 2.58% | 2.66% |
PMBS PIMCO Mortgage-Backed Securities Active Exchange-Traded Fund | 4.94% | 4.73% | 1.59% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Drawdowns
MBB vs. PMBS - Drawdown Comparison
The maximum MBB drawdown since its inception was -17.64%, which is greater than PMBS's maximum drawdown of -4.35%. Use the drawdown chart below to compare losses from any high point for MBB and PMBS.
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Drawdown Indicators
| MBB | PMBS | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -17.64% | -4.35% | -13.29% |
Max Drawdown (1Y)Largest decline over 1 year | -2.64% | -3.04% | +0.40% |
Max Drawdown (5Y)Largest decline over 5 years | -17.19% | — | — |
Max Drawdown (10Y)Largest decline over 10 years | -17.64% | — | — |
Current DrawdownCurrent decline from peak | -1.69% | -1.84% | +0.15% |
Average DrawdownAverage peak-to-trough decline | -2.36% | -1.11% | -1.25% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.96% | 1.05% | -0.09% |
Volatility
MBB vs. PMBS - Volatility Comparison
iShares MBS Bond ETF (MBB) and PIMCO Mortgage-Backed Securities Active Exchange-Traded Fund (PMBS) have volatilities of 1.98% and 1.94%, 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
| MBB | PMBS | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.98% | 1.94% | +0.04% |
Volatility (6M)Calculated over the trailing 6-month period | 3.00% | 2.87% | +0.13% |
Volatility (1Y)Calculated over the trailing 1-year period | 4.97% | 4.77% | +0.20% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.77% | 4.94% | +1.83% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.27% | 4.94% | +0.33% |