iShares MBS ETF (MBB) Performance
MBB total return
Distributions reinvested · as of Oct 23, 2026- YTD
- −1.0% since Dec 31, 2025
- 1 year
- −0.6% total return
- 5 years
- +0.1% a year
- 10 years
- +1.1% a year
- Since first price
- +2.5% a year since 2007
MBB trailing returns vs AGG, TLT, SPY
| Period | MBB total return | Price only | U.S. bonds (AGG) | 20+ yr Treasuries (TLT) | S&P 500 (SPY) |
|---|---|---|---|---|---|
| 1 month | +1.3% | +0.8% | +0.9% | +1.5% | −1.0% |
| 3 months | −0.6% | −1.7% | −0.4% | −1.0% | +3.2% |
| 6 months | −1.8% | −4.0% | −1.5% | −3.8% | +7.8% |
| YTD | −1.0% | −4.1% | −1.0% | −3.4% | +12.3% |
| 1 year | −0.6% | −4.8% | −1.1% | −6.9% | +14.4% |
| 3 years | +19.8%+6.2%/yr | +5.9% | +16.6%+5.2%/yr | +9.7%+3.1%/yr | +87.4%+23.3%/yr |
| 5 years | +0.6%+0.1%/yr | −15.2% | −0.8%−0.2%/yr | −32.5%−7.6%/yr | +79.3%+12.4%/yr |
| 10 years | +11.0%+1.1%/yr | −16.9% | +14.0%+1.3%/yr | −18.7%−2.0%/yr | +315.9%+15.3%/yr |
| 15 years | +25.2%+1.5%/yr | −15.1% | +32.2%+1.9%/yr | +9.9%+0.6%/yr | +696.0%+14.8%/yr |
| Since inceptionMar 16, 2007 | +63.6%+2.5%/yr | −9.5% | — | — | — |
Total return from adjusted closes (distributions reinvested, before tax). Periods of 3 years or more are also shown annualized. Price only excludes distributions.
Growth of $10,000: MBB vs AGG
From Mar 16, 2007: MBB grew to $16,363, AGG to $17,363.
Year-end values with distributions reinvested, no taxes or trading costs. Start: first common trading day of both funds.
MBB returns by calendar year
15 of 18 full years positive. Best 2025 (+8.4%), worst 2022 (−11.7%). 2026 is year to date.
MBB annual returns table
| Year | MBB | Largest drop | AGG | TLT | SPY |
|---|---|---|---|---|---|
| 2026YTD | −1.0% | −5.4% | −1.0% | −3.4% | +12.3% |
| 2025 | +8.4% | −2.6% | +7.2% | +4.3% | +17.7% |
| 2024 | +1.3% | −4.3% | +1.3% | −8.1% | +24.9% |
| 2023 | +5.0% | −9.0% | +5.7% | +2.8% | +26.2% |
| 2022 | −11.7% | −15.9% | −13.0% | −31.2% | −18.2% |
| 2021 | −1.4% | −2.1% | −1.8% | −4.6% | +28.7% |
| 2020 | +4.1% | −4.3% | +7.5% | +18.2% | +18.3% |
| 2019 | +6.2% | −0.7% | +8.5% | +14.1% | +31.2% |
| 2018 | +0.8% | −2.5% | +0.1% | −1.6% | −4.6% |
| 2017 | +2.5% | −1.7% | +3.6% | +9.2% | +21.7% |
| 2016 | +1.3% | −3.4% | +2.4% | +1.2% | +12.0% |
| 2015 | +1.1% | −1.7% | +0.5% | −1.8% | +1.2% |
| 2014 | +6.4% | −0.9% | +6.0% | +27.3% | +13.5% |
| 2013 | −1.9% | −4.8% | −2.0% | −13.4% | +32.3% |
| 2012 | +2.0% | −1.0% | +3.8% | +2.6% | +16.0% |
| 2011 | +5.9% | −1.6% | +7.7% | +34.0% | +1.9% |
| 2010 | +5.6% | −2.4% | +6.4% | +9.0% | +15.1% |
| 2009 | +4.7% | −2.0% | +3.0% | −21.8% | +26.4% |
| 2008 | +7.7% | −3.8% | +7.9% | +33.9% | −36.8% |
Largest drop = deepest fall from a high within that calendar year.
Calendar-year return vs largest drop within the year
Most years include a sizable fall at some point even when the year ends higher.
MBB largest drawdowns
Now 3.0% below the high| Peak | Decline | Bottom | Recovered | Fall | Underwater |
|---|---|---|---|---|---|
| Feb 9, 2021 | −17.6% | Oct 19, 2023 | Oct 28, 2025 | 2.7 years | 4.7 years |
| Feb 27, 2026 | −5.4% | Oct 5, 2026 | not yet | 7 months | 8 months so far |
Declines from a closing high (distributions reinvested) of 5% or more. Underwater = time from the peak until the old high was regained.
MBB risk statistics
| Statistic | 3 years | 5 years | 10 years | Since 2007 |
|---|---|---|---|---|
| Annualized return | +4.5% | −0.4% | +0.8% | +2.4% |
| Volatility (annualized) | 6.4% | 7.2% | 5.3% | 4.3% |
| Sharpe ratio | 0.04 | -0.53 | -0.25 | 0.27 |
| Sortino ratio | 0.05 | -0.67 | -0.33 | 0.37 |
| Best month | +5.2% | +5.2% | +5.2% | +5.2% |
| Worst month | −3.4% | −5.1% | −5.1% | −5.1% |
| Best 12 months | +12.1% | +12.1% | +12.1% | +12.1% |
| Worst 12 months | −1.7% | −15.0% | −15.0% | −15.0% |
| Positive months | 69% | 52% | 57% | 64% |
| Beta vs S&P 500 | 0.25 | 0.28 | 0.14 | — |
| Correlation with S&P 500 | 0.49 | 0.62 | 0.39 | — |
From monthly total returns. Sharpe and Sortino use 1–3 month T-bills (BIL) as the risk-free rate, so they need history from 2007 on.
MBB rolling returns
| Holding period | Periods | Worst | Median | Best | Positive |
|---|---|---|---|---|---|
| 1-year | 224 | −15.0% | +3.4% | +12.1% | 75% |
| 3-year (a year) | 200 | −5.8% | +2.3% | +7.9% | 82% |
| 5-year (a year) | 176 | −1.3% | +2.2% | +6.3% | 80% |
| 10-year (a year) | 116 | +0.2% | +2.0% | +4.0% | 100% |
Every holding period starting at a month-end since 2007. Returns for 3 years and longer are annualized.
MBB performance overview
iShares MBS ETF (MBB) returned −0.6% over the past year and +1.1% a year over ten years, with distributions reinvested. Since its first recorded price in 2007 it has returned +2.5% a year, turning $10,000 into about $16,363. Over the same year U.S. bonds (AGG) returned −1.1%.
The deepest decline was −17.6%, from Feb 9, 2021 to Oct 19, 2023, and it took 2.0 years to get back to the old high. MBB finished 15 of its 18 full calendar years with a gain; the best year was 2025 (+8.4%) and the worst 2022 (−11.7%). Volatility has been 4.3% a year.
Related: MBB chart, MBB dividends, MBB bond profile. See the MBB overview for the latest quote and fund facts.
MBB performance FAQ
What is the MBB return over the past year?
MBB returned −0.6% over the 12 months to October 23, 2026, including reinvested distributions. On price alone it fell 4.8%.
What is the average annual return of MBB?
MBB has returned +0.1% a year over 5 years, +1.1% a year over 10 years, +2.5% a year since March 16, 2007 (total return, distributions reinvested).
How much would $10,000 invested in MBB be worth?
$10,000 invested in MBB at its first recorded close on March 16, 2007 would be worth about $16,363 on October 23, 2026 with distributions reinvested.
What was the worst year for MBB?
The worst calendar year was 2022, with a total return of −11.7%. The best was 2025 at +8.4%.
What is the biggest drawdown of MBB?
The largest peak-to-trough decline was −17.6% between February 9, 2021 and October 19, 2023. It recovered to the old high on October 28, 2025, 2.0 years after the bottom.
How volatile is MBB?
Over the past 3 years MBB had an annualized volatility of 6.4% and a Sharpe ratio of 0.04 (excess return over 1–3 month T-bills per unit of risk).