Key stats
About iShares MBS ETF
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Inception date
Mar 13, 2007
Structure
Open-Ended Fund
Replication method
Physical
Dividend treatment
Distributes
Distribution tax treatment
Ordinary income
Income tax type
Capital Gains
Max ST capital gains rate
39.60%
Max LT capital gains rate
20.00%
Primary advisor
BlackRock Fund Advisors
Distributor
BlackRock Investments LLC
For pure-play coverage of investment-grade mortgage pass-through debt issued by the major US agencies, MBB brings the total package. The fund offers excellent coverage, but to be fair, so do two competing fundsVMBS and SPMBthat track the same or similar indexes. The fund was first to market in this space in 2007, and has a hefty asset base to show for it. MBB is competitively priced after iShares slashed the fund`s fee in July 2017. In all, MBB is a solid choice for MBS exposure.
Classification
Returns
| 1 month | 3 months | Year to date | 1 year | 3 years | 5 years | |
|---|---|---|---|---|---|---|
| Price performance | — | — | — | — | — | — |
| NAV total return | — | — | — | — | — | — |
What's in the fund
Exposure type
Securitized
Bonds, Cash & Other100.00%
Securitized95.97%
Cash4.03%
Top 10 holdings
Dividends
Dividend payout history
Assets under management (AUM)
Fund Flows
Frequently Asked Questions
MBB last dividends amounted to 0.33 USD. The month before, the issuer paid 0.33 USD in dividends, which shows a 1.66% decrease.
MBB assets under management is 38.13 B USD. It's fallen 0.13% over the last month.
MBB fund flows account for 7.27 B USD (1 year). Many traders use this metric to get insight into investors' sentiment and evaluate whether it's time to buy or sell the fund.
Yes, MBB pays dividends to its holders with the dividend yield of 4.14%. The last dividend (Jun 5, 2025) amounted to 0.33 USD. The dividends are paid monthly.
MBB shares are issued by BlackRock, Inc. under the brand iShares. The ETF was launched on Mar 13, 2007, and its management style is Passive.
MBB expense ratio is 0.04% meaning you'd have to pay 0.04% of your investment to help manage the fund.
MBB follows the Bloomberg US Aggregate Securitized - MBS. ETFs usually track some benchmark seeking to replicate its performance and guide asset selection and objectives.
MBB invests in bonds.
MBB price has fallen by −1.28% over the last month, and its yearly performance shows a −0.14% decrease. See more dynamics on MBB price chart.
NAV returns, another gauge of an ETF dynamics, have fallen by −0.44% over the last month, showed a −0.56% decrease in three-month performance and has increased by 3.86% in a year.
NAV returns, another gauge of an ETF dynamics, have fallen by −0.44% over the last month, showed a −0.56% decrease in three-month performance and has increased by 3.86% in a year.
MBB trades at a premium (0.01%) meaning the ETF is trading at a higher price than the calculated NAV.