iShares MBS ETF (MBB) holdings
Top holdings
The 10 largest positions make up 9.9% of the fund, as reported on Oct 12, 2026.
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Frequently asked questions
What are the top holdings of MBB?
As of Oct 12, 2026, the largest positions in iShares MBS ETF are U.S. Dollar (4.5%), 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 9.9% of iShares MBS ETF, as reported on Oct 12, 2026.
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.