Data as of Sep 13, 2026. Both funds on the fields they both publish, from the same sources.
MBB vs VGLT: how they differ
MBB and VGLT hold 0% of their weight in the same names, and MBB returned more over the year.
iShares MBS ETF and Vanguard Long-Term Treasury Index Fund.
What they hold in common
By the books each fund has filed, MBB and VGLT hold 0% of their money in the same securities at the same weight.
| Only in MBB | Only in VGLT |
|---|---|
| BLACKROCK CASH CL INST SL AGENCY 7.26% | JPMorgan Chase & Co 0.62% |
| GNMA2 SF 30YR 0.09% | Mexico Government International Bond 0.50% |
| GNMA II 30YR SF - JUMBO-CONFORMING 0.08% | United States Treasury Note/Bond 0.49% |
| GNMA2 SINGLE FAMILY 30YR 0.04% | United States Treasury Note/Bond 0.48% |
| GNMA II 30YR 0.03% | United States Treasury Note/Bond 0.48% |
| GNMA2 30YR TBA(REG C) 0.03% | Mexico Government International Bond 0.48% |
| UMBS 15YR TBA(REG B) 0.03% | United States Treasury Note/Bond 0.44% |
| FNMA 30YR UMBS MEGA REMIC SUPER 0.02% | Province of British Columbia Canada 0.43% |
Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Apr 30, 2026 and Sep 10, 2026.
| MBB iShares MBS ETF | VGLT Vanguard Long-Term Treasury Index Fund | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | Vanguard |
| What it is | Mbs | Long-term Treasury |
| Total return, 1 year | −0.1% | −5.4% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −17.6 pts | −22.9 pts |
| Expense ratio | 0.04% | not published |
| Holdings | 2599 | 1703 |
MBB in plain words
MBB is a bond fund tracking the Mbs. Over the year to Sep 11, 2026 it returned −0.1% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.04% a year. It sat 3.3% below its high of Feb 27, 2026 on Sep 11, 2026.
VGLT in plain words
VGLT is a bond fund tracking the Long-term Treasury. Over the year to Sep 11, 2026 it returned −5.4% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. It sat 39.2% below its high of Aug 4, 2020 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, MBB or VGLT?
- In the year to Sep 13, 2026, with distributions reinvested, MBB returned −0.1% and VGLT returned −5.4%, so MBB returned more. One year is one year; the longer windows are in the table.
Other comparisons
Where to next
Where these figures came from
ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.
Cite this page. ETFIQ, MBB against VGLT, data as of Sep 13, 2026. https://etfiq.com/compare/any/mbb-vs-vglt Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources