iShares MBS ETF (MBB) holdings
Top holdings
The 10 largest positions make up 13.0% of the fund, as reported on Aug 27, 2026.
Frequently asked questions
What are the top holdings of MBB?
As of Aug 27, 2026, the largest positions in iShares MBS ETF are U.S. Dollar (7.1%), GNMA II TBA 30yr 5.5% September Delivery 5.500% 01-MAY-2056 (1.0%), FHLMC 30yr Pool#SD8146 2.000% 01-May-2051 2.0% 01-MAY-2051 (0.9%), UMBS TBA 30yr 5.5% September Delivery 5.500% 01-MAY-2056 (0.9%), UMBS TBA 30yr 5% September Delivery 5.000% 01-MAY-2056 (0.7%).
How concentrated is MBB?
The 10 largest positions make up 13.0% of iShares MBS ETF, as reported on Aug 27, 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.