iShares MBS ETF (MBB)
An exchange-traded fund listed on NASDAQ. A fund is not a company: it has no filed accounts of its own here, and it is never ranked beside companies. Every figure below is market data, with the day it was supplied.
Price
Last close 90.59 USD on Oct 15, 2026. Market data, supplied Oct 15, 2026.
What it costs
| Expense ratio | 0.04% |
| Assets under management | 35.76B USD |
| Net asset value per share | 90.16 USD |
| Inception | Mar 13, 2007 |
| Sponsor | IShares |
| Asset class | Fixed Income |
| Holdings the fund reports | 10,858 |
Market data, supplied Oct 15, 2026.
What it holds
The largest 25 by weight of the 10,852 holdings in the snapshot of Oct 15, 2026. A fund is marked as a fund, and a holding that is not a company's share (a bond, a bill, cash, an option or a swap) is marked as not a company.
| # | Holding | Weight |
|---|---|---|
| 1 | BLACKROCK CASH CL INST SL AGENCY (not a company) | 4.89% |
| 2 | FHLMC 30YR UMBS SUPER 2.00% 05/01/2051 (not a company) | 1.04% |
| 3 | GNMA2 30YR TBA 6.00% 11/19/2026 (not a company) | 0.68% |
| 4 | UMBS 30YR TBA(REG A) 5.50% 11/12/2026 (not a company) | 0.60% |
| 5 | GNMA2 30YR 5.00% 11/20/2054 (not a company) | 0.59% |
| 6 | GNMA2 30YR 2.00% 10/20/2051 (not a company) | 0.54% |
| 7 | GNMA2 30YR 2.00% 12/20/2051 (not a company) | 0.53% |
| 8 | FNMA 30YR UMBS 2.00% 12/01/2051 (not a company) | 0.52% |
| 9 | GNMA2 30YR TBA(REG C) 5.50% 11/19/2026 (not a company) | 0.52% |
| 10 | GNMA2 30YR 2.50% 07/20/2051 (not a company) | 0.51% |
| 11 | FHLMC 30YR UMBS SUPER 2.00% 04/01/2051 (not a company) | 0.50% |
| 12 | FNMA 30YR UMBS 2.00% 11/01/2051 (not a company) | 0.44% |
| 13 | GNMA2 30YR 5.00% 04/20/2056 (not a company) | 0.43% |
| 14 | GNMA2 30YR 5.50% 09/20/2053 (not a company) | 0.40% |
| 15 | GNMA2 30YR 5.50% 09/20/2055 (not a company) | 0.40% |
| 16 | GNMA2 30YR TBA(REG C) 5.00% 11/19/2026 (not a company) | 0.36% |
| 17 | GNMA2 30YR 2.50% 05/20/2051 (not a company) | 0.35% |
| 18 | UMBS 30YR TBA(REG A) 5.00% 11/12/2026 (not a company) | 0.35% |
| 19 | FNMA 30YR UMBS SUPER 2.00% 04/01/2052 (not a company) | 0.33% |
| 20 | FNMA 30YR UMBS 2.00% 03/01/2051 (not a company) | 0.33% |
| 21 | GNMA2 30YR 2.00% 01/20/2052 (not a company) | 0.32% |
| 22 | GNMA2 30YR 5.00% 05/20/2056 (not a company) | 0.32% |
| 23 | FNMA 30YR UMBS 2.00% 10/01/2051 (not a company) | 0.31% |
| 24 | GNMA2 30YR 2.50% 08/20/2051 (not a company) | 0.30% |
| 25 | FNMA 30YR UMBS 2.00% 04/01/2051 (not a company) | 0.30% |
Market data, supplied Oct 15, 2026.
Sector weights
| 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% |
Market data, supplied Oct 15, 2026.
Country weights
| United States | 100.00% |
Market data, supplied Oct 15, 2026.
Look-through value
Earnings yield, P/E and book yield of the holdings taken together: n/a. Look-through figures are not measured for this fund yet.