# iShares MBS ETF (MBB) — Holdings

MBB · NASDAQ · Fund

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

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

The 10 largest positions make up 10.0% of the fund. Want full holdings data source? [Register at AInvest](https://www.ainvest.com/etfs/NASDAQ-MBB/holdings/).

| Ticker | Weight |
| --- | --- |
| U.S. Dollar | 4.66% |
| FHLMC 30yr Pool#SD8146 2.000% 01-May-2051 2.0% 01-MAY-2051 | 1.00% |
| GNMA II TBA 30yr 6% October Delivery 6.000% 01-MAY-2056 | 0.65% |
| UMBS TBA 30yr 5.5% November Delivery 5.500% 01-JUN-2056 | 0.57% |
| GNMA II 30yr Pool#MB0025 5.000% 20-Nov-2054 5.0% 20-NOV-2054 | 0.56% |
| GNMA II TBA 30yr 5.5% October Delivery 5.500% 01-JUN-2056 | 0.55% |
| GNMA II 30yr Pool#MA7648 2.000% 20-Oct-2051 2.0% 20-OCT-2051 | 0.52% |
| GNMA II 30yr Pool#MA7766 2.000% 20-Dec-2051 2.0% 20-DEC-2051 | 0.51% |
| FNMA 30yr Pool#MA4492 2.000% 01-Dec-2051 2.0% 01-DEC-2051 | 0.50% |
| GNMA II 30yr Pool#MA7472 2.500% 20-Jul-2051 2.5% 20-JUL-2051 | 0.49% |

## Frequently Asked Questions

### What are the top holdings of MBB?

As of Oct 14, 2026, the largest positions in iShares MBS ETF are U.S. Dollar (4.7%), FHLMC 30yr Pool#SD8146 2.000% 01-May-2051 2.0% 01-MAY-2051 (1.0%), GNMA II TBA 30yr 6% October Delivery 6.000% 01-MAY-2056 (0.7%), UMBS TBA 30yr 5.5% November Delivery 5.500% 01-JUN-2056 (0.6%), GNMA II 30yr Pool#MB0025 5.000% 20-Nov-2054 5.0% 20-NOV-2054 (0.6%).

### How concentrated is MBB?

The 10 largest positions make up 10.0% of iShares MBS 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).