MBB: iShares MBS ETF returns, drawdowns and risk
Broad bond funds that mix government, corporate and mortgage bonds in one holding.
Data updated October 2026
MBB · US exchange · USDCategory: Aggregate bond ETFsData from March 2007
From March 2007 to October 2026 MBB returned 2.5% a year on average with dividends reinvested, in US dollars: $10,000 invested at the start grew to $16,226.
Its deepest fall was 17.6%, from February 2021 to October 2023, and it took about 57 months to get back to the previous high. Annual volatility was 4.6%; at the last close it was 3.9% below its high.
Against AGG (iShares Core U.S. Aggregate Bond ETF), over the 235 months both have data, the correlation of monthly returns was 0.89: they usually moved together. Beta was 0.83. In months when AGG rose, MBB moved 81% as much on average; in months when AGG fell, 77% as much.
Key figures
- Annual return (CAGR)
- +2.5%
- 1-year return
- −1.6%
- 5 years, a year
- −0.0%
- 10 years, a year
- +1.0%
- Annual volatility
- 4.6%
- Maximum drawdown
- −17.6%
- Sharpe ratio
- 0.21
- Worst year
- 2022: −11.7%
Trailing returns
| Period | MBB | AGG |
|---|---|---|
| 1 year | −1.6% | −1.9% |
| 3 years, a year | +6.0% | +5.2% |
| 5 years, a year | −0.0% | −0.3% |
| 10 years, a year | +1.0% | +1.2% |
To the last close of October 2026. Periods longer than a year are annualised.
Growth of $10,000: MBB vs AGG
Month-end values from April 2007, the first month both funds have data.
MBB drawdowns
Percentage below the previous high, weekly.
Returns by calendar year
| Year | MBB | AGG |
|---|---|---|
| 2026(partial) | −1.8% | −1.8% |
| 2025 | +8.4% | +7.2% |
| 2024 | +1.3% | +1.3% |
| 2023 | +5.0% | +5.7% |
| 2022 | −11.7% | −13.0% |
| 2021 | −1.4% | −1.8% |
| 2020 | +4.1% | +7.5% |
| 2019 | +6.2% | +8.5% |
| 2018 | +0.8% | +0.1% |
| 2017 | +2.5% | +3.5% |
| 2016 | +1.3% | +2.4% |
| 2015 | +1.1% | +0.5% |
| 2014 | +6.4% | +6.0% |
| 2013 | −1.9% | −2.0% |
| 2012 | +2.0% | +3.8% |
| 2011 | +5.9% | +7.7% |
| 2010 | +5.6% | +6.4% |
| 2009 | +4.7% | +3.0% |
| 2008 | +7.8% | +7.9% |
| 2007(partial) | +5.0% | — |
How the figures are calculated
Total return in the fund’s trading currency, from end-of-day prices with dividends reinvested on the ex-date. The fund’s own ongoing charges are already reflected in its price; trading costs, taxes and currency conversion are not included. Past returns do not predict future returns.
Sharpe ratio uses the return of short-term government bills in the same currency as the risk-free rate. The growth chart uses month-end values; drawdowns and volatility use daily closes.
Questions
What is the average annual return of MBB?
From March 2007 to October 2026 MBB returned 2.5% a year on average (CAGR) with dividends reinvested, in USD. Over the last 5 years: −0.0% a year. Over the last 12 months: −1.6%.
What was the worst drawdown of MBB?
17.6%, from February 2021 to October 2023; it took about 57 months from the previous high to get back to it.
How volatile is MBB?
Annual volatility was 4.6% over the period. Its worst month was −5.1% and 64% of months were positive. Worst calendar year: 2022 (−11.7%).
How closely does MBB follow AGG?
Over 235 months the correlation of monthly returns was 0.89, so they usually moved together, with a beta of 0.83.
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Other Aggregate bond ETFs
- All Aggregate bond ETFsReturns and risk side by side
- AGG — iShares Core U.S. Aggregate Bond ETFCAGR +2.9%
- AGGH — iShares Core Global Aggregate Bond UCITS ETF EUR Hedged (Acc)CAGR −0.8%
- BNDX — Vanguard Total International Bond ETFCAGR +2.2%
- BSV — Vanguard Short-Term Bond ETFCAGR +2.5%
- BIV — Vanguard Intermediate-Term Bond ETFCAGR +3.7%
- BLV — Vanguard Long-Term Bond ETFCAGR +3.9%
Source: MarketStack end-of-day prices, total return with dividends reinvested. Figures are historical and descriptive; they are not forecasts and not investment advice. MEDGE Capital does not recommend buying or selling any instrument. Risk disclaimer.