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iShares MBS ETF
Trading data
MBB performance and flow charts
Performance
Flows
Historic performance and flows
Data as of March 11, 2026| 1M | 3M | YTD | 1Y | 3Y | 5Y | |
|---|---|---|---|---|---|---|
| Perf. | -0.11% | +1.04% | +0.74% | +6.54% | +13.70% | +1.80% |
| Flows | -$125M | -$67M | -$19M | +$1.10B | +$12.75B | +$14.89B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | |
|---|---|---|---|---|
| Volatility | +3.21% | +4.50% | +6.33% | +6.42% |
Max drawdown | -1.33% | -2.84% | -8.73% | -17.39% |
Max drawdown duration | 10d | 80d | 252d | 1535d |
Time to recover | N/A | 36d | 56d | 1092d |
Replication quality
Data as of February 27, 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 |
Exposure
Data as of January 31, 2026Countries
Sectors
Maturity
Credit rating
Diversification
Total weight of top 15 holdings out of 9,373
Top 15 Holdings
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 |
| Provider | iShares |
| N° of holdings | 9373 |
| Replication method | Direct (Physical) |
| Asset class | Bonds |
| Dividend policy | Distributing |
Trailing 12m distribution yield | Join for free |
| Inception date | March 13, 2007 |
| ESG | No |
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 March 11, 2026, MBB manages $39.03 B, reflecting the total assets held in the fund.
How has MBB performed recently?
As of March 11, 2026, MBB delivered a return of -0.11% over the past month (1M performance), 1.04% over the past three months (3M), and 0.74% year-to-date (YTD).
What are the recent fund flows for MBB?
As of March 11, 2026, MBB has seen net flows of -$125M in the past month (1M flow) and -$19M year-to-date (YTD).
Does MBB pay dividends?
As of March 11, 2026, MBB has a trailing 12-month distribution yield of 4.2%.
How many holdings are in MBB
As of January 31, 2026, MBB holds 9373 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 January 31, 2026, MBB holds 9373 securities, with 12.99% of its assets concentrated in its top 15 holdings.
What are the top holdings of MBB?
As of January 31, 2026, MBB holds a portfolio of 9373 underlyings, with its largest positions including US0669225197, FR SD8146, 2% 1may2051, USD (ABS) and US21H0526291. 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 January 31, 2026, MBB has its largest geographic exposures in USA.
What sectors or themes does MBB focus on?
As of January 31, 2026, MBB is primarily exposed to Other sectors.
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