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iShares MBS ETF
MBB performance and flow charts
Performance
Flows
Historic performance and flows
Data as of September 10, 2026| 1M | 3M | YTD | 1Y | 3Y | 5Y | |
|---|---|---|---|---|---|---|
| Perf. | -1.16% | -1.51% | -1.15% | +0.30% | +13.98% | -0.40% |
| Flows | +$655M | +$892M | +$1.52B | -$888M | +$12.43B | +$17.94B |
Characteristics
The iShares MBS ETF is built to track the Bloomberg U.S. MBS Total Return Index - USD. This ETF provides physical exposure - by owning its shares you earn the return of the securities composing the index (as the ETF holds them directly). This share class generates a stream of income by distributing dividends.
| Management strategy | Passive |
| Strategy | Long Only |
| Provider | iShares |
| N° of holdings | 9388 |
| Replication method | Direct (Physical) |
| Asset class | Fixed Income |
| Dividend policy | Distributing |
Trailing 12m distribution yield | Join for free |
| Inception date | March 13, 2007 |
| ESG | No |
More data and info about MBB on Trackinsight
Exposure
Data as of July 31, 2026Diversification
Total weight of top 15 holdings out of 9,388
Top 15 Holdings
Sectors
Countries
Maturity
Credit rating
Latest news about MBB
Similar ETFs
Trading data
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | |
|---|---|---|---|---|
| Volatility | +4.89% | +4.22% | +5.85% | +6.60% |
Max drawdown | -2.60% | -3.19% | -5.44% | -17.29% |
Max drawdown duration | 73d | 193d | 75d | 1492d |
Time to recover | N/A | N/A | 40d | 1092d |
Replication quality
Data as of August 31, 2026Create an account to view replication metrics
1 year cumulative return difference | |
|---|---|
| Best | Join for free |
| Worst | Join for free |
| daily return difference | |
|---|---|
| Average | Join for free |
| Worst | Join for free |
What type of ETF is MBB?
MBB is a Passive ETF that provides exposure to Fixed Income assets. It is managed by iShares.
What index does MBB track?
MBB tracks the Bloomberg U.S. MBS Total Return Index - USD, aiming to replicate its performance through full replication.
What does MBB invest in?
This ETF provides exposure to US Investment Grade Government Agencies Bonds. It is part of the segment: MBS & ABS.
What is the expense ratio of MBB?
The total expense ratio (TER) of MBB is 0.04%, representing the annual fee charged by the fund manager.
When was MBB launched?
MBB was launched on March 13, 2007, marking its entry into the ETF market.
Who is the issuer of MBB?
MBB is issued by iShares.
What is the AUM of MBB?
As of September 10, 2026, MBB manages $39.00 B, reflecting the total assets held in the fund.
How has MBB performed recently?
As of September 10, 2026, MBB delivered a return of -1.16% over the past month (1M performance), -1.51% over the past three months (3M), and -1.15% year-to-date (YTD).
What are the recent fund flows for MBB?
As of September 10, 2026, MBB has seen net flows of +$655M in the past month (1M flow) and +$1.52B year-to-date (YTD).
Does MBB pay dividends?
As of September 10, 2026, MBB has a trailing 12-month distribution yield of 4.41%.
How many holdings are in MBB
As of July 31, 2026, MBB holds 9388 securities in its portfolio. This level of diversification can influence the fund’s risk profile and exposure to individual assets.
How diversified is MBB?
As of July 31, 2026, MBB holds 9388 securities, with 16.01% of its assets concentrated in its top 15 holdings.
What are the top holdings of MBB?
As of July 31, 2026, MBB holds a portfolio of 9388 underlyings, with its largest positions including BlackRock Cash Funds - Institutional, FR SD8146, 2% 1may2051, USD (ABS) and US21H0526861. These top holdings play a significant role in shaping the fund’s performance and exposure.
What countries or regions does MBB invest in?
As of July 31, 2026, MBB has its largest geographic exposures in USA.
What sectors or themes does MBB focus on?
As of July 31, 2026, MBB is primarily exposed to Industrials and Non-Corporate.
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