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iShares MBS (MBB) ETF Holdings & Analysis
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What MBB does
The iShares MBS ETF, known by its symbol MBB, is structured to mirror the financial performance of a specific index. This index is made up of premium, mortgage-backed pass-through securities that have been either provided or secured by agencies of the United States government.
Fund profile
Top holdings
| Holding | Weight | |
|---|---|---|
| BLACKROCK CASH CL INST SL AGENCY | 5.03% | |
| USD CASH | 3.78% | |
| FHLMC 30YR UMBS SUPER 2.00% 05/01/2051 | 0.97% | |
| UMBS 30YR TBA(REG A) 5.50% 11/12/2026 | 0.56% | |
| GNMA2 30YR 5.00% 11/20/2054 | 0.55% | |
| GNMA2 30YR 2.00% 10/20/2051 | 0.50% | |
| GNMA2 30YR 2.00% 12/20/2051 | 0.49% | |
| FNMA 30YR UMBS 2.00% 12/01/2051 | 0.49% | |
| GNMA2 30YR TBA(REG C) 5.50% 11/19/2026 | 0.48% | |
| GNMA2 30YR 2.50% 07/20/2051 | 0.48% |
Sector allocation
| Federal National Mortgage Association | 42.64% |
| Federal Home Loan Mortgage Corporation | 30.24% |
| Government National Mortgage Association | 24.01% |
| Uniform MBS | 2.67% |
| Cash and/or Derivatives | 0.44% |
Geographic allocation
| United States | 100.00% |
PortView Portfolio Insights
PortView analyzes how MBB fits your actual portfolio — position weight, ETF overlap with your other funds, sector and geographic exposure, concentration, and how this fund contributes to your portfolio risk and return. Connect a portfolio to see your personalized figures; PortView never shows another user's private holdings.
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Frequently asked questions
- What does MBB track?
- MBB is the iShares MBS ETF, a Other ETF.
- What is the expense ratio of MBB?
- Expense ratio data for MBB is shown on the page when available from our data provider.
- What are the largest holdings in MBB?
- Top holdings include BLACKROCK CASH CL INST SL AGENCY, USD CASH, FHLMC 30YR UMBS SUPER 2.00% 05/01/2051, UMBS 30YR TBA(REG A) 5.50% 11/12/2026, GNMA2 30YR 5.00% 11/20/2054.
- How can PortView analyze MBB overlap with other ETFs?
- PortView computes the holdings overlap between MBB and the other ETFs and stocks you own, plus your combined sector and geographic exposure, so you can see true diversification.
The information provided by PortView is for informational and educational purposes only and does not constitute investment advice. Market data may be delayed. Past performance does not guarantee future results.