# iShares Mortgage-Backed Securities Active ETF (MBBA) — Holdings

MBBA · BATS · Fund

Canonical page: https://www.lighthorse.io/tickers/mbba/holdings

## Top holdings (as of Oct 14, 2026)

The 10 largest positions make up 94.3% of the fund. Want full holdings data source? [Register at AInvest](https://www.ainvest.com/etfs/CBOE-MBBA/holdings/).

| Ticker | Weight |
| --- | --- |
| BlackRock Cash Funds Treasury SL Agency Shares | 47.39% |
| UMBS TBA 30yr 5.5% November Delivery 5.500% 01-JUN-2056 | 12.74% |
| UMBS TBA 30yr 6% November Delivery 6.000% 01-JUL-2056 | 6.16% |
| FHLMC 30yr Pool#SL6270 2.000% 01-Aug-2052 2.0% 01-AUG-2052 | 4.98% |
| GNMA II TBA 30yr 2% October Delivery 2.000% 01-AUG-2051 | 4.77% |
| FNMA 30yr Pool#CA6950 2.500% 01-Sep-2050 2.5% 01-SEP-2050 | 4.70% |
| UMBS TBA 15yr 2% November Delivery 2.000% 01-SEP-2036 | 4.24% |
| UMBS TBA 30yr 3.5% November Delivery 3.500% 01-AUG-2056 | 3.54% |
| GNMA II TBA 30yr 5% October Delivery 5.000% 01-JUN-2056 | 2.94% |
| FNMA 30yr Pool#FA3994 5.500% 01-Nov-2054 5.5% 01-NOV-2054 | 2.86% |

## Frequently Asked Questions

### What are the top holdings of MBBA?

As of Oct 14, 2026, the largest positions in iShares Mortgage-Backed Securities Active ETF are BlackRock Cash Funds Treasury SL Agency Shares (47.4%), UMBS TBA 30yr 5.5% November Delivery 5.500% 01-JUN-2056 (12.7%), UMBS TBA 30yr 6% November Delivery 6.000% 01-JUL-2056 (6.2%), FHLMC 30yr Pool#SL6270 2.000% 01-Aug-2052 2.0% 01-AUG-2052 (5.0%), GNMA II TBA 30yr 2% October Delivery 2.000% 01-AUG-2051 (4.8%).

### How concentrated is MBBA?

The 10 largest positions make up 94.3% of iShares Mortgage-Backed Securities Active ETF, as reported on Oct 14, 2026.

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Fund holdings are reported periodically and are a snapshot of a past date, not a live position list — what the fund holds today may differ. Weights cover only the largest positions shown, not the whole portfolio.

This page is for informational purposes only. Nothing on it is a recommendation, solicitation or offer to buy or sell any security, nor investment, legal or tax advice. Light Horse Securities Inc does not verify third-party data and is not responsible for its accuracy, completeness or timeliness.

Data provided by [AInvest](https://www.ainvest.com).