MBB iShares MBS ETF
Issuer
IShares
Inception
Mar 13, 2007
AUM
$35.4B
Expense ratio
0.04%
Yield
4.51%
Asset class
Fixed Income
Holdings
10782
Last price
$90.36
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.
-4.9%
2025-11-13low 89.09 · high 96.912026-11-13
Performance
| 1M | 3M | YTD | 1Y | 3Y ann. | 5Y ann. | |
|---|---|---|---|---|---|---|
| MBB | +0.4% | -3.4% | -5.1% | -5.0% | +0.7% | -3.4% |
| Fixed Income average (909 funds) | +0.3% | -2.0% | -2.6% | -2.7% | +0.3% | -1.3% |
Insider activity in the holdings
Open-market insider buying across this fund’s holdings over 90 days, weighted by holding weight: +$0 net.
No open-market insider buys in the holdings in the last 90 days.
Holdings · as of Nov 13, 2026
| # | Holding | Weight |
|---|---|---|
| 1 | MBB BLACKROCK CASH CL INST SL AGENCY | 5.07% |
Sector breakdown
Federal National Mortgage Association42.6%
Federal Home Loan Mortgage Corporation30.2%
Government National Mortgage Association24.0%
Uniform MBS2.7%
Cash and/or Derivatives0.4%
Country breakdown
United States94.9%
Other5.1%
Distributions
| Date | Per unit |
|---|---|
| Nov 2, 2026 | $0.3471 |
| Oct 1, 2026 | $0.3662 |
| Sep 1, 2026 | $0.3388 |
| Aug 3, 2026 | $0.3413 |
| Jul 1, 2026 | $0.3373 |
| Jun 1, 2026 | $0.3334 |
| May 1, 2026 | $0.3347 |
| Apr 1, 2026 | $0.3330 |
| Mar 2, 2026 | $0.3278 |
| Feb 2, 2026 | $0.3347 |
| Dec 19, 2025 | $0.3341 |
| Dec 1, 2025 | $0.3469 |
| Nov 3, 2025 | $0.3420 |
| Oct 1, 2025 | $0.3363 |
| Sep 2, 2025 | $0.3383 |
| Aug 1, 2025 | $0.3319 |
| Jul 1, 2025 | $0.3322 |
| Jun 2, 2025 | $0.3251 |
| May 1, 2025 | $0.3255 |
| Apr 1, 2025 | $0.3309 |
| Mar 3, 2025 | $0.3204 |
| Feb 3, 2025 | $0.3414 |
| Dec 18, 2024 | $0.2944 |
| Dec 2, 2024 | $0.3074 |
| Nov 1, 2024 | $0.3099 |
| Oct 1, 2024 | $0.3113 |
| Sep 3, 2024 | $0.3177 |
| Aug 1, 2024 | $0.3086 |
| Jul 1, 2024 | $0.3053 |
| Jun 3, 2024 | $0.3002 |
| May 1, 2024 | $0.2823 |
| Apr 1, 2024 | $0.2827 |
| Mar 1, 2024 | $0.2921 |
| Feb 1, 2024 | $0.2968 |
| Dec 14, 2023 | $0.2757 |
| Dec 1, 2023 | $0.2804 |
| Nov 1, 2023 | $0.2735 |
| Oct 2, 2023 | $0.2904 |
| Sep 1, 2023 | $0.2640 |
| Aug 1, 2023 | $0.2759 |
Members of Congress who disclosed this ETF
| Member | Action | Amount band | Date |
|---|---|---|---|
| John Boozman · Senate · R | Buy | $1K–$15K | Sep 9, 2026 |
| John Boozman · Senate · R | Buy | $1K–$15K | May 27, 2026 |
| John Boozman · Senate · R | Sell | $1K–$15K | May 13, 2026 |
| John Boozman · Senate · R | Sell | $1K–$15K | Feb 6, 2026 |
| John Boozman · Senate · R | Buy | $1K–$15K | Jan 23, 2026 |
| John Boozman · Senate · R | Buy | $1K–$15K | Nov 21, 2025 |
| John Boozman · Senate · R | Sell | $1K–$15K | Sep 16, 2025 |
| John Boozman · Senate · R | Buy | $1K–$15K | Aug 1, 2025 |
| John Boozman · Senate · R | Buy | $1K–$15K | Sep 6, 2024 |
| John Boozman · Senate · R | Buy | $1K–$15K | Nov 7, 2023 |
| John Boozman · Senate · R | Buy | $1K–$15K | Jun 23, 2023 |
| John Boozman · Senate · R | Buy | $15K–$50K | Jun 13, 2023 |
| John Boozman · Senate · R | Sell | $1K–$15K | Jun 22, 2022 |
Fund facts, prices, performance and distributions: our market-data vendor. Holdings: the vendor and SEC Form N-PORT. Insider and Congress data: InsiderBuying. Last updated Nov 13, 2026. This is historical data, not investment advice. Report a data error