iShares MBS ETF
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Chart
MBB is a passive ETF that seeks to track the Bloomberg U.S. MBS Index, which is composed primarily of investment-grade U.S. agency mortgage-backed pass-through securities (issued and/or guaranteed by agencies/GSEs such as Ginnie Mae, Fannie Mae, and Freddie Mac). Its interest-rate exposure tends to sit in the intermediate part of the curve; as of Apr 16, 2026 the fund’s effective duration was 5.29 years. It’s commonly used as a core securitized/agency MBS allocation for income with high credit quality, while still carrying meaningful rate and mortgage prepayment/extension risk typical of MBS.
| Classification | |
|---|---|
| Ticker | MBB |
| Type | Mortgage-Backed |
| Issuer | BlackRock iShares |
| Benchmark | Bloomberg U.S. MBS Index |
| Exchange | NASDAQ |
| Country | United States |
| Bond Metrics | |
|---|---|
| Yield | 4.10% |
| Effective Duration | 5.29 yrs |
| Duration Bucket | Intermediate (3-7y) |
| Credit Quality | AAA |
| AUM | $38.9B |
| Expense Ratio | 0.04% |
| Social Media Sentiment | — |
| Max Drawdown (1Y) | — |
Price Action
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| Prev Close | — |
| Volume | — |
| Ranges | |
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| 26W High | — |
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| 52W Low | — |
| All-Time High | — |
| All-Time Low | — |
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| Price | — |
| Volume | — |
| Average Volume | — |
| 52W High | — |
| 52W Low | — |
| Volatility (%) | — |
| Risk | |
|---|---|
| Volatility | — |
| Max Drawdown (1Y) | — |
| Duration (yrs) | 5.29 yrs |
| Credit Quality | AAA |
US Treasury Curve
| Tenor | Yield | 1D Change | vs 10Y Spread |
|---|---|---|---|
| 3-Month | 4.42% | -0.02 | — |
| 2-Year | 4.18% | -0.04 | -24 bps |
| 5-Year | 4.05% | -0.03 | -37 bps |
| 10-Year | 4.22% | +0.01 | — |
| 20-Year | 4.58% | +0.02 | +36 bps |
| 30-Year | 4.45% | +0.02 | +23 bps |
Latest constant-maturity Treasury yields sourced from FRED / US Treasury.
Holdings Coming Soon
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