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Data as of Oct 28, 2026.

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MBB vs VGLT: Differences, Returns & Fees

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MBB's duration was 5.7 years on Aug 31, 2026 and VGLT's 13.5 on May 31, 2026; VGLT charges 0.03% to MBB's 0.04%.

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Net assets: $35.5bn on Oct 28, 2026 for iShares MBS ETF, and $10.4bn on Sep 30, 2026 for Vanguard Long-Term Treasury ETF.

MBB on its own →VGLT on its own →
At a glance
−0.8%
MBB total return, 1 year
−6.7%
VGLT total return, 1 year
0.04%
MBB expense ratio
0.03%
VGLT expense ratio

Pair scorecard

VGLT costs 0.01 points a year less; their one-year returns differ by 5.9 points; MBB is 3.5 times larger.

MBB vs VGLT: Differences, Returns & Fees
MeasureMBBVGLT
Return
Total return, 1 year−0.8%−6.7%
Drawdown
Below its high38.8%, high on Aug 4, 2020
Benchmark
What it tracksBloomberg U.S. MBS IndexBloomberg U.S. Long Treasury Index
Cost and size
Expense ratio0.04%0.03%
Net assets, as of Sep 30, 2026$36.2bn$10.4bn
Holdings
Holdings in common0%

Holdings in common uses holdings dated May 31, 2026 and Aug 31, 2026. Method

What they share

0%

By the books each fund has filed, MBB and VGLT hold 0% of their money in the same securities at the same weight. Holdings dated May 31, 2026 and Aug 31, 2026.

0 half 100%

half

0% in common

Positions both hold · largest shared weight first MBB VGLT
Only in one fund ↓
Only in MBB
Ginnie Mae, due Sep 1, 2056 1.05%
Freddie Mac Pool, due May 1, 2051 0.98%
Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 0.85%
Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 0.70%
Ginnie Mae, due Sep 1, 2056 0.53%
Ginnie Mae II Pool, due Nov 20, 2054 0.51%
Ginnie Mae II Pool, due Oct 20, 2051 0.51%
Ginnie Mae II Pool, due Dec 20, 2051 0.50%
Only in VGLT
US TREASURY N/B, due Feb 15, 2056 2.22%
US TREASURY N/B, due Aug 15, 2055 2.21%
US TREASURY N/B, due May 15, 2055 2.21%
US TREASURY N/B, due May 15, 2054 2.17%
US TREASURY N/B, due Feb 15, 2055 2.17%
US TREASURY N/B, due Nov 15, 2055 2.17%
US TREASURY N/B, due Nov 15, 2053 2.14%
US TREASURY N/B, due Nov 15, 2054 2.13%
Check overlap with more funds →

Side by side

MBB iShares MBS ETF VGLT Vanguard Long-Term Treasury ETF
Where it sits Bond ETF Bond ETF
Issuer iShares Vanguard
What it is Tracks an index of mortgage-backed securities Tracks an index of Long-term Treasury
Total return, 1 year −0.8% −6.7%
Its benchmark over the same days −1.1% (SPMB) −6.7% (SCHQ)
Gap to its benchmark +0.3 pts vs SPMB 0.0 pts vs SCHQ
Expense ratio 0.04% 0.03%
Holdings 10813 102
Net assets, MBB as of Oct 28, 2026 and VGLT as of Sep 30, 2026 $35.5bn $10.4bn

MBB and VGLT on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.

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About each fund
MBB

MBB tracks an index of mortgage-backed securities. Over the year to Oct 28, 2026 it returned −0.8% with distributions reinvested, against −1.1% for its benchmark, the Bloomberg U.S. MBS Index. The prospectus expense ratio is 0.04% a year.

VGLT

VGLT tracks an index of Long-term Treasury. Over the year to Oct 28, 2026 it returned −6.7% with distributions reinvested, against −6.7% for its benchmark, the Bloomberg U.S. Long Treasury Index. The prospectus expense ratio is 0.03% a year. It sat 38.8% below its high of Aug 4, 2020 on Oct 28, 2026.

Questions people ask

Which returned more over the last year, MBB or VGLT?
In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and VGLT −6.7%.
Which is cheaper, MBB or VGLT?
VGLT is cheaper, by 0.01 percentage points a year. That is about $1 on $10,000 held for a year. Fees come from each fund's prospectus.
Other comparisons
EDV vs MBBMBB vs TLTMBB vs VCLTMBB vs TIPVGIT vs VGLTTLT vs VGLTBIL vs VGLTVGLT vs VTIP
Where to next
MBB on its own →VGLT on its own →Hold both: look the portfolio through →Rankings →MBB dividend history →MBB holdings →VGLT dividend history →VGLT holdings →Standards and sources →
Sources and dates
MBB filings on SEC EDGAR ↗
MBB prospectus with the expense ratio (SEC) ↗
iShares page for MBB ↗
VGLT filings on SEC EDGAR ↗
VGLT prospectus with the expense ratio (SEC) ↗
Vanguard page for VGLT ↗

Links are sources, not endorsements. A comparison is not a recommendation.

How this is computed

Overlap adds up the smaller of the two weights for each security both funds hold.

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ETFIQ, MBB against VGLT, data as of Oct 28, 2026. https://etfiq.com/compare/any/mbb-vs-vglt

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