iShares MBS ETF
MBB
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- iShares MBS ETF (MBB) is an exchange-traded fund that seeks to track the investment results of an index composed of investment-grade mortgage-backed pass-through securities issued and/or guaranteed by U.S. government agencies, including the Federal National Mortgage Association (FNMA), Federal Home Loan Mortgage Corporation (FHLMC), and Government National Mortgage Association (GNMA); the fund holds fixed- and floating-rate securities, with top issuers typically including FNMA (approximately 44-45% weight), FHLMC (28-29%), and GNMA II (22-23%), alongside smaller allocations to Uniform MBS, FHLMC-Gold, and GNMA I. Launched on March 13, 2007, and managed by BlackRock under its iShares brand, the ETF is listed on NASDAQ with ticker MBB (CUSIP 464288588) and maintains a low expense ratio of 0.04%, featuring over 11,000 holdings and net assets exceeding $39 billion as of late 2025. The fund primarily serves institutional and retail investors seeking exposure to the U.S. mortgage-backed securities market segment within the broader fixed-income asset class. Geographically, it focuses exclusively on U.S. dollar-denominated securities backed by government-sponsored enterprises, with BlackRock's global headquarters in New York City. In recent developments, institutional ownership has remained robust at around 91.7%, with significant increases reported in 2025, such as Beacon Financial Group boosting its holdings by 19.8% in Q3 to over 79,000 shares valued at $7.57 million, reflecting sustained demand amid fixed-income market dynamics.