---
ticker: "MBBA"
name: "iShares Mortgage-Backed Securities Active ETF"
url: "https://etf.net/etf/MBBA"
grade: "C"
score: 53
graded_at: "2026-10-12"
category: "Mortgage-Backed Securities"
category_rank: "9 of 25"
methodology: "https://etf.net/methodology"
---

# MBBA: iShares Mortgage-Backed Securities Active ETF

Grade **C**, Score 53 of 100. Rank 9 of 25 in Mortgage-Backed Securities.

Graded Oct 12, 2026.

## Grade pillars

| Pillar | Score | Category rank |
| --- | --- | --- |
| Cost | 67 | 8 of 25 |
| Mission | Not scored | — |
| Risk | 23 | 24 of 25 |
| Tradability | 68 | 6 of 25 |
| Holdings | 25 | 22 of 25 |
| Durability | 78 | 5 of 25 |

## Top holdings

The fund holds 670 positions. These are the largest 30, by weight.

| # | Ticker | Name | Weight |
| --- | --- | --- | --- |
| 1 | — | Blk Csh Fnd Treasury Sl Agency | 47.52% |
| 2 | — | Umbs 30YR Tba(Reg A) 5.50% 11/12/2026 (UM30) | 12.77% |
| 3 | — | Umbs 30YR Tba(Reg A) 6.00% 11/12/2026 (UM30) | 6.18% |
| 4 | — | Fhlmc 30YR Umbs Super 2.00% 08/01/2052 (FRSL6270) | 4.99% |
| 5 | — | GNMA2 30YR Tba(Reg C) 2.00% 10/20/2026 (G230J) | 4.78% |
| 6 | — | Fnma 30YR Umbs 2.50% 09/01/2050 (FNCA6950) | 4.71% |
| 7 | — | Umbs 15YR Tba(Reg B) 2.00% 11/17/2026 (UM15) | 4.25% |
| 8 | — | Umbs 30YR Tba(Reg A) 3.50% 11/12/2026 (UM30) | 3.54% |
| 9 | — | GNMA2 30YR Tba(Reg C) 5.00% 10/20/2026 (G230J) | 2.95% |
| 10 | — | Fnma 30YR Umbs Super 5.50% 11/01/2054 (FNFA3994) | 2.87% |
| 11 | — | Fnma 30YR Umbs 6.00% 10/01/2055 (FNCC1249) | 2.83% |
| 12 | — | GNMA2 30YR Tba(Reg C) 5.50% 10/20/2026 (G230J) | 2.64% |
| 13 | — | FHSTR_436 Ab 4.00% 05/25/2027 (FHSTR_436-AB) | 2.62% |
| 14 | — | Umbs 30YR Tba(Reg A) 6.50% 11/12/2026 (UM30) | 2.40% |
| 15 | — | Umbs 30YR Tba(Reg A) 2.50% 11/12/2026 (UM30) | 2.31% |
| 16 | — | GNMA2 30YR 2.00% 07/20/2051 (G2MA7471) | 2.09% |
| 17 | — | GNMA2 30YR Tba(Reg C) 3.00% 10/20/2026 (G230J) | 2.07% |
| 18 | — | Fhlmc 30YR Umbs 2.00% 11/01/2051 (FRRA6235) | 1.93% |
| 19 | — | GNMA2 30YR Tba(Reg C) 2.50% 10/20/2026 (G230J) | 1.88% |
| 20 | — | Fnma 30YR Umbs 5.00% 05/01/2056 (FNMA6053) | 1.87% |
| 21 | — | Fhlmc 30YR Umbs Super 4.00% 01/01/2053 (FRSD8286) | 1.86% |
| 22 | — | Fnma 30YR Umbs 5.00% 11/01/2055 (FNCC1427) | 1.82% |
| 23 | — | GNMA2 30YR Tba(Reg C) 4.50% 10/20/2026 (G230J) | 1.73% |
| 24 | — | Fnma 30YR Umbs Super 3.00% 12/01/2051 (FNFA6393) | 1.67% |
| 25 | — | Fnma 30YR Umbs Super 4.50% 05/01/2056 (FNFA5785) | 1.61% |
| 26 | — | Fhlmc 30YR Umbs Super 2.00% 11/01/2053 (FRSL5152) | 1.60% |
| 27 | — | GNMA_22-208D Pa 4.75% 07/20/2051 (GNMA_22-208D-PA) | 1.49% |
| 28 | — | GNMA2 30YR Tba(Reg C) 6.00% 10/20/2026 (G230J) | 1.44% |
| 29 | — | GNMA_26-28A Pf 4.65% 02/20/2056 (GNMA_26-28A-PF) | 1.41% |
| 30 | — | Fnma 30YR Umbs Super 2.50% 07/01/2050 (FNFM4001) | 1.41% |

Source: etf.net, https://etf.net/etf/MBBA. Please cite the page URL.