MBB – iShares MBS ETF

iShares MBS ETF (MBB) is a Government Mortgage-Backed Bond ETF, issued by iShares, $35.5B in assets, 0.03% expense ratio.

Returns as of Oct 23, 2026: 1 week +0.9%, 1 year -0.5%.

Invests in mortgage-backed securities and TBAs that match the underlying index's economic characteristics. Focuses on fixed income securities.

Top holdings