MBB vs. MBSX
MBB (iShares MBS Bond ETF) and MBSX (Regan Fixed Rate MBS ETF) are both Mortgage Backed Securities funds. MBB is passively managed, while MBSX is actively managed. Over the past year, MBB returned 6.76% vs 13.81% for MBSX. At a 0.07 correlation, their price movements are largely independent. MBB charges 0.06%/yr vs 0.40%/yr for MBSX.
Performance
MBB vs. MBSX - Performance Comparison
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Returns By Period
In the year-to-date period, MBB achieves a 0.58% return, which is significantly lower than MBSX's 6.22% return.
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%
MBSX
- 1D
- 9.68%
- 1M
- 3.16%
- YTD
- 6.22%
- 6M
- 6.79%
- 1Y
- 13.81%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
MBB vs. MBSX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
MBB iShares MBS Bond ETF | 0.58% | 5.20% |
MBSX Regan Fixed Rate MBS ETF | 6.22% | 8.23% |
Correlation
The correlation between MBB and MBSX is 0.09, 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 | 0.09 |
Correlation (All Time) Calculated using the full available price history since May 2, 2025 | 0.07 |
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Return for Risk
MBB vs. MBSX — Risk / Return Rank
MBB
MBSX
MBB vs. MBSX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares MBS Bond ETF (MBB) and Regan Fixed Rate MBS ETF (MBSX). 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 | MBSX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +1.25 | ||
| Sortino ratioReturn per unit of downside risk | +1.47 | ||
| Omega ratioGain probability vs. loss probability | 1.27 | 1.15 | +0.12 |
| Calmar ratioReturn relative to maximum drawdown | 2.31 | 0.50 | +1.80 |
| Martin ratioReturn relative to average drawdown | 7.64 | 2.08 | +5.56 |
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 | MBSX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.51 | 0.26 | +1.25 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.05 | — | — |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.25 | — | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.58 | 0.25 | +0.33 |
Drawdowns
MBB vs. MBSX - Drawdown Comparison
The maximum MBB drawdown since its inception was -17.64%, smaller than the maximum MBSX drawdown of -27.57%. Use the drawdown chart below to compare losses from any high point for MBB and MBSX.
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Drawdown Indicators
| MBB | MBSX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -17.64% | -27.57% | +9.93% |
Max Drawdown (1Y)Largest decline over 1 year | -2.94% | -27.57% | +24.63% |
Max Drawdown (3Y)Largest decline over 3 years | -7.68% | — | — |
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 | -1.52% | -20.56% | +19.04% |
Average DrawdownAverage peak-to-trough decline | -2.35% | -6.02% | +3.67% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.89% | 6.64% | -5.75% |
Volatility
MBB vs. MBSX - Volatility Comparison
The current volatility for iShares MBS Bond ETF (MBB) is 1.59%, while Regan Fixed Rate MBS ETF (MBSX) has a volatility of 41.45%. This indicates that MBB experiences smaller price fluctuations and is considered to be less risky than MBSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MBB | MBSX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.59% | 41.45% | -39.86% |
Volatility (6M)Calculated over the trailing 6-month period | 3.23% | 50.89% | -47.66% |
Volatility (1Y)Calculated over the trailing 1-year period | 4.51% | 53.40% | -48.89% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.81% | 54.70% | -47.89% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.31% | 54.70% | -49.39% |
MBB vs. MBSX - Expense Ratio Comparison
MBB has a 0.06% expense ratio, which is lower than MBSX's 0.40% expense ratio.
Dividends
MBB vs. MBSX - Dividend Comparison
MBB's dividend yield for the trailing twelve months is around 4.28%, more than MBSX's 3.36% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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% |
MBSX Regan Fixed Rate MBS ETF | 3.36% | 2.77% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
MBB and MBSX have a correlation of 0.09, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MBSX has higher volatility (41.45%) compared to MBB (1.59%). In terms of maximum drawdown, MBB dropped -17.64% vs MBSX's -27.57%.
On 1-year performance, MBSX leads with 13.81% vs 6.76% for MBB. On fees, MBB is cheaper at 0.06% per year. On volatility, MBB has been the lower-risk option at 1.59%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 1-year period, MBSX has performed better with a 13.81% return vs 6.76%. 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 0.40% for MBSX.
MBB has the higher dividend yield at 4.28%, compared with 3.36% for MBSX.
They also come from different issuers: iShares and Regan. Their fees differ too: 0.06% for MBB and 0.40% for MBSX.
MBB currently has the higher Sharpe Ratio (1.51 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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