Index · 2 ranked
Funds Tracking the Bloomberg U.S. MBS
Ranked by expense ratio, lowest first.
Data as of May 31, 2026 ·How this data is built
As of May 31, 2026, FundVersus ranks 2 funds tracking the Bloomberg U.S. MBS by expense ratio. The lowest is iShares MBS ETF (MBB) at 0.04%. The median is 0.04%; weighted by assets, 0.04%.
Facts from SEC filings. Not investment advice.
The ranking
Only the stated measure sets the order. Expense ratios from prospectuses; net assets and returns from Form N-PORT.
| # | Fund | Expense ratio | Net assets | 1-year return | |
|---|---|---|---|---|---|
| 1 | iShares MBS ETFMBB · ETF · Mortgage-Backed | 0.04% | $39.8B | +7.45% | |
| 2 | State Street SPDR Portfolio Mortgage Backed Bond ETFSPMB · ETF · Mortgage-Backed | 0.04% | $6.9B | +5.71% |
Questions
How is this list ranked?
Ranked by expense ratio, lowest first. It includes funds tracking the Bloomberg U.S. MBS with a current SEC filing and enough data for a FundVersus page. The ranking uses one stated measure and is not a recommendation.
Which has the lowest expense ratio?
iShares MBS ETF (MBB), at 0.04% as of May 31, 2026.
How much money is in these funds?
The 2 funds on this list reported $46.7B in combined net assets on their latest filings.