Fund screener · iShares

MBB: iShares MBS ETF

ETF

Fixed Income

iShares MBS ETF (MBB) is a iShares ETF with a 0.04% expense ratio and $35.5B in net assets.

Fee

0.04%

expense ratio

Net assets

$35.5B

Launched

Mar 13, 2007

Holdings

—

no holdings data

Top 10 weight

—

largest ten holdings

Largest sector

—

Yield

30-day SEC 4.42% · TTM 4.45%

as of Oct 22, 2026

Benchmark

Bloomberg U.S. MBS Index

Performance

Sector breakdown

No sector breakdown for this fund: its holdings are bonds, commodities or other assets without a sector, or we don't have its holdings.

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Data from iShares; prices and returns from market data. Page updated October 29, 2026. Holdings and figures change over time. For information only — not investment advice.