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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.
| Symbol | Name | Weight | Market Value |
|---|---|---|---|
| — | BLACKROCK CASH CL INST SL AGENCY | 6.33% | $2.50B |
| — | FHLMC 30YR UMBS SUPER 2.00% 05/01/2051 | 1.02% | $401.23M |
| — | GNMA2 30YR TBA(REG C) 5.50% 07/20/2026 | 0.93% | $366.92M |
| — | GNMA2 30YR TBA(REG C) 5.00% 07/20/2026 | 0.88% | $347.77M |
| — | UMBS 30YR TBA(REG A) 5.50% 07/13/2026 | 0.87% | $345.38M |
| — | UMBS 30YR TBA(REG A) 5.00% 07/13/2026 | 0.67% | $265.60M |
| — | GNMA2 30YR 5.00% 11/20/2054 | 0.53% | $210.89M |
| — | GNMA2 30YR 2.00% 10/20/2051 | 0.53% | $208.01M |
| — | GNMA2 30YR 2.00% 12/20/2051 | 0.52% | $204.23M |
| — | FNMA 30YR UMBS 2.00% 12/01/2051 | 0.51% | $200.86M |
| — | FHLMC 30YR UMBS SUPER 2.00% 04/01/2051 | 0.49% | $192.31M |
| — | GNMA2 30YR TBA(REG C) 4.50% 07/20/2026 | 0.46% | $183.73M |
| — | GNMA2 30YR TBA(REG C) 6.00% 07/20/2026 | 0.45% | $177.38M |
| — | GNMA2 30YR 2.50% 07/20/2051 | 0.44% | $174.64M |
| — | FNMA 30YR UMBS 2.00% 11/01/2051 | 0.43% | $170.15M |
| — | FNMA 30YR UMBS SUPER 2.00% 07/01/2051 | 0.42% | $167.24M |
| — | GNMA2 30YR 5.50% 09/20/2053 | 0.40% | $156.57M |
| — | GNMA2 30YR 2.00% 03/20/2052 | 0.35% | $139.29M |
| — | GNMA2 30YR 2.50% 05/20/2051 | 0.34% | $135.90M |
| — | UMBS 30YR TBA(REG A) 6.00% 07/13/2026 | 0.32% | $128.33M |
| — | FNMA 30YR UMBS SUPER 2.00% 04/01/2052 | 0.32% | $125.39M |
| — | FNMA 30YR UMBS 2.00% 03/01/2051 | 0.32% | $125.24M |
| — | FNMA 30YR UMBS 2.00% 10/01/2051 | 0.30% | $120.26M |
| — | GNMA2 30YR 2.00% 01/20/2052 | 0.30% | $119.29M |
| — | GNMA2 30YR 2.50% 08/20/2051 | 0.29% | $116.08M |