MBB
iShares MBS ETF·NASDAQ
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Key Stats
Assets Under Management
39.24BUSD
Fund Flows (1Y)
1.22BUSD
Dividend Yield
4.19%
Discount/Premium to NAV
-0.03%
Shares Outstanding
410.80M
Expense Ratio
0.04%
About iShares MBS ETF
Issuer
BlackRock Fund Advisors
Brand
iShares
Inception Date
Mar 13, 2007
Structure
Open-Ended Fund
Index Tracked
Bloomberg U.S. MBS Index
Management Style
Passive
Dividend Treatment
Distributes
Distribution Tax Treatment
Ordinary income
Income Tax Type
Capital Gains
Max ST Capital Gains Rate
39.60%
Max LT Capital Gains Rate
20.00%
Primary Advisor
BlackRock Fund Advisors
Distributor
BlackRock Investments LLC
For pure-play coverage of investment-grade mortgage pass-through debt issued by the major US agencies, MBB brings the total package. The fund offers excellent coverage, but to be fair, so do two competing funds—VMBS and SPMB—that track the same or similar indexes. The fund was first to market in this space in 2007, and has a hefty asset base to show for it. MBB is competitively priced after iShares slashed the fund's fee in July 2017. In all, MBB is a solid choice for MBS exposure.
Classification
Asset Class
Fixed Income
Category
Government, Mortgage-backed
Focus
Investment Grade
Niche
Broad Maturities
Strategy
Vanilla
Geography
U.S.
Weighting Scheme
Market Value
Selection Criteria
Market value
Returns
1-Month | 3-Month | YTD | 1-Year | 3-Year | 5-Year | |
|---|---|---|---|---|---|---|
Price Performance | +0.12% | +0.26% | +0.17% | +3.13% | +0.77% | -13.29% |
NAV Total Return | +0.59% | +1.24% | +0.77% | +7.83% | +13.20% | +0.78% |
Ratings
No data is currently available
Ainvest’s AI-powered ETF Scoring Algorithm, built to help retail investors make smarter, data-driven decisions. Leveraging deep learning, reinforcement learning, and large language models, the algorithm scores ETFs across five key dimensions: Fund Flow, Momentum, Safety, Fundamentals, and Performance. Each factor is weighted by its correlation to future returns, resulting in a single, actionable score. Backtested over five years with consistently strong predictive accuracy. Ainvest brings institutional-grade artificial intelligence to everyday investors—transforming complexity into clarity with every score.
Holdings Analysis
Sector
No data is currently available
Asset
No data is currently available
Region
No data is currently available
Investment Style
No data is currently available
Top 10 Holdings
Symbol
Ratio
BLACKROCK CASH CL INST SL AGENCY
5.09%
USD CASH
4.68%
FHLMC 30YR UMBS SUPER
1.07%
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GNMA2 30YR TBA(REG C)
1.06%
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UMBS 30YR TBA(REG A)
0.63%
GNMA2 30YR
0.56%
FNMA 30YR UMBS
0.53%
FNMA 30YR UMBS SUPER
0.45%
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UMBS 15YR TBA(REG B)
0.35%
FHLMC 30YR UMBS
0.22%
Top 10 Weight 14.64%
65 Total Holdings
Is SPY better than MBB?
Dividends
Dividend Payout History
Declaration Date | Record Date | Payment Date | Amount |
|---|---|---|---|
| 2026-02-02 | 2026-02-02 | 2026-02-05 | 0.335 |
| 2025-12-19 | 2025-12-19 | 2025-12-24 | 0.334 |
| 2025-12-01 | 2025-12-01 | 2025-12-05 | 0.347 |
| 2025-11-03 | 2025-11-03 | 2025-11-06 | 0.342 |
| 2025-10-01 | 2025-10-01 | 2025-10-06 | 0.336 |
| 2025-09-02 | 2025-09-02 | 2025-09-05 | 0.338 |
| 2025-08-01 | 2025-08-01 | 2025-08-06 | 0.332 |
Show more
How Much Does MBB Pay in Dividends?
Premium/Discount Chart
Assets Under Management
Should I buy MBB?
Fund Flows
