GNMA vs. MBB
Compare and contrast key facts about iShares GNMA Bond ETF (GNMA) and iShares MBS Bond ETF (MBB).
GNMA and MBB are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. GNMA is a passively managed fund by iShares that tracks the performance of the Barclays Capital GNMA Index. It was launched on Feb 14, 2012. 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. Both GNMA and MBB are passive ETFs, meaning that they are not actively managed but aim to replicate the performance of the underlying index as closely as possible.
Performance
GNMA vs. MBB - Performance Comparison
Loading graphics...
GNMA vs. MBB - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
GNMA iShares GNMA Bond ETF | 0.22% | 8.25% | 1.07% | 5.34% | -10.83% | -1.86% | 3.51% | 5.85% | 0.85% | 1.74% |
MBB iShares MBS Bond ETF | 0.41% | 8.38% | 1.31% | 5.01% | -11.74% | -1.43% | 4.08% | 6.18% | 0.82% | 2.49% |
Returns By Period
In the year-to-date period, GNMA achieves a 0.22% return, which is significantly lower than MBB's 0.41% return. Over the past 10 years, GNMA has underperformed MBB with an annualized return of 1.24%, while MBB has yielded a comparatively higher 1.34% annualized return.
GNMA
- 1D
- 0.05%
- 1M
- -1.75%
- YTD
- 0.22%
- 6M
- 2.07%
- 1Y
- 5.33%
- 3Y*
- 3.97%
- 5Y*
- 0.40%
- 10Y*
- 1.24%
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%
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
GNMA vs. MBB - Expense Ratio Comparison
GNMA has a 0.15% 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%.
Return for Risk
GNMA vs. MBB — Risk / Return Rank
GNMA
MBB
GNMA vs. MBB - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares GNMA Bond ETF (GNMA) 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.
| GNMA | MBB | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 1.12 | 1.14 | -0.02 |
Sortino ratioReturn per unit of downside risk | 1.63 | 1.63 | 0.00 |
Omega ratioGain probability vs. loss probability | 1.20 | 1.20 | 0.00 |
Calmar ratioReturn relative to maximum drawdown | 1.88 | 2.18 | -0.30 |
Martin ratioReturn relative to average drawdown | 5.60 | 6.00 | -0.40 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
Loading graphics...
Sharpe Ratios by Period
| GNMA | MBB | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.12 | 1.14 | -0.02 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.06 | 0.06 | 0.00 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.24 | 0.25 | -0.01 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.25 | 0.59 | -0.34 |
Correlation
The correlation between GNMA and MBB is 0.69, which is considered to be moderate. This suggests that the two assets have some degree of positive relationship in their price movements. Moderate correlation can be acceptable for portfolio diversification, offering a balance between risk and potential returns.
Dividends
GNMA vs. MBB - Dividend Comparison
GNMA's dividend yield for the trailing twelve months is around 4.21%, which matches MBB's 4.22% yield.
| TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
GNMA iShares GNMA Bond ETF | 4.21% | 4.19% | 4.15% | 3.43% | 2.01% | 0.64% | 1.89% | 2.61% | 2.41% | 2.15% | 1.89% | 1.50% |
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% |
Drawdowns
GNMA vs. MBB - Drawdown Comparison
The maximum GNMA drawdown since its inception was -17.09%, roughly equal to the maximum MBB drawdown of -17.64%. Use the drawdown chart below to compare losses from any high point for GNMA and MBB.
Loading graphics...
Drawdown Indicators
| GNMA | MBB | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -17.09% | -17.64% | +0.55% |
Max Drawdown (1Y)Largest decline over 1 year | -2.93% | -2.64% | -0.29% |
Max Drawdown (5Y)Largest decline over 5 years | -16.02% | -17.19% | +1.17% |
Max Drawdown (10Y)Largest decline over 10 years | -17.09% | -17.64% | +0.55% |
Current DrawdownCurrent decline from peak | -1.75% | -1.69% | -0.06% |
Average DrawdownAverage peak-to-trough decline | -3.69% | -2.36% | -1.33% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.98% | 0.96% | +0.02% |
Volatility
GNMA vs. MBB - Volatility Comparison
The current volatility for iShares GNMA Bond ETF (GNMA) is 1.77%, while iShares MBS Bond ETF (MBB) has a volatility of 1.98%. This indicates that GNMA 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.
Loading graphics...
Volatility by Period
| GNMA | MBB | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.77% | 1.98% | -0.21% |
Volatility (6M)Calculated over the trailing 6-month period | 2.76% | 3.00% | -0.24% |
Volatility (1Y)Calculated over the trailing 1-year period | 4.78% | 4.97% | -0.19% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.56% | 6.77% | -0.21% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.11% | 5.27% | -0.16% |