iShares MBS ETF (MBB)
BlackRock / iShares
- Page updated:
- Sep 7, 2026
- Data as of:
- Jul 31, 2026
Fund identity
- Ticker
- MBB
- Fund name
- iShares MBS ETF
- Fund type
- ETF
- Listing venue
- NASDAQ
- Currency
- USD
- Domicile
- US
- Inception
- Mar 13, 2007
Structure and strategy
- Sponsor
- BlackRock / iShares
- Management approach
- Passive
- Strategy
- Tracks U.S. agency mortgage-backed securities.
- Portfolio scope
- U.S. agency mortgage-backed pass-through securities
- Portfolio implementation
- Index tracking
- Benchmark
- Bloomberg U.S. MBS Index
- Benchmark symbol
- LUMSTRUU
- Asset class
- Fixed Income
- Category
- Agency Mortgage-Backed Securities
Agency mortgage-backed securities are securitized fixed-income instruments; fund ownership is not direct real-estate ownership.
Costs and minimums
- Net expense ratio
- 0.04%
- Expense ratio
- 0.04%
- Ongoing fee as of
- Sep 7, 2026
Size and distributions
- Assets under management
- $38.93B
- Assets under management scope
- Fund
- Trailing 12-month yield
- 4.32%
- SEC 30-day yield
- 4.31%
- Distribution frequency
- Monthly
Sources
- iShares MBS ETF — issuer product page — BlackRock / iShares · data as of Sep 7, 2026
Learn the basics
ROIStreet publishes this reference data for education and research. Figures are as of the dates shown, are not real-time quotes, and are not investment advice. Verify details with the issuer or provider before acting.