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Data as of Oct 28, 2026.

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MBB vs VBIL: Differences, Returns & Fees

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MBB's duration was 5.7 years on Aug 31, 2026 and VBIL's 0.1 on Jun 30, 2026; MBB charges 0.04% to VBIL's 0.06%.

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askIQ about MBB and VBIL

Net assets: $35.5bn on Oct 28, 2026 for iShares MBS ETF, and $12.8bn on Sep 30, 2026 for Vanguard 0-3 Month Treasury Bill ETF.

MBB on its own →VBIL on its own →
At a glance
−0.8%
MBB total return, 1 year
+3.7%
VBIL total return, 1 year
0.04%
MBB expense ratio
0.06%
VBIL expense ratio

Pair scorecard

MBB costs 0.02 points a year less; their one-year returns differ by 4.5 points; MBB is 2.8 times larger.

MBB vs VBIL: Differences, Returns & Fees
MeasureMBBVBIL
Return
Total return, 1 year−0.8%+3.7%
Benchmark
What it tracksBloomberg U.S. MBS IndexBloomberg U.S. Treasury Bills 0-3 Months Index
Cost and size
Expense ratio0.04%0.06%
Net assets, as of Sep 30, 2026$36.2bn$12.8bn
Holdings
Holdings in common0%

Holdings in common uses holdings dated Jun 30, 2026 and Aug 31, 2026. Method

What they share

0%

By the books each fund has filed, MBB and VBIL hold 0% of their money in the same securities at the same weight. Holdings dated Jun 30, 2026 and Aug 31, 2026.

0 half 100%

half

0% in common

Positions both hold · largest shared weight first MBB VBIL
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 VBIL
TREASURY BILL, due Jul 9, 2026 6.78%
TREASURY BILL, due Aug 6, 2026 6.10%
TREASURY BILL, due Jul 2, 2026 5.61%
TREASURY BILL, due Jul 16, 2026 5.41%
TREASURY BILL, due Jul 23, 2026 5.18%
TREASURY BILL, due Jul 14, 2026 5.17%
TREASURY BILL, due Jul 21, 2026 5.15%
TREASURY BILL, due Jul 30, 2026 5.12%
Check overlap with more funds →

Side by side

MBB iShares MBS ETF VBIL Vanguard 0-3 Month Treasury Bill 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 0-3 Month Treasury Bill
Total return, 1 year −0.8% +3.7%
Its benchmark over the same days −1.1% (SPMB) not measured
Gap to its benchmark +0.3 pts vs SPMB not measured
Expense ratio 0.04% 0.06%
Holdings 10813 28
Net assets, MBB as of Oct 28, 2026 and VBIL as of Sep 30, 2026 $35.5bn $12.8bn

MBB and VBIL 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.

VBIL

VBIL tracks an index of 0-3 Month Treasury Bill. Over the year to Oct 28, 2026 it returned +3.7% with distributions reinvested. The prospectus expense ratio is 0.06% a year.

Questions people ask

Which returned more over the last year, MBB or VBIL?
In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and VBIL +3.7%.
Which is cheaper, MBB or VBIL?
MBB is cheaper, by 0.02 percentage points a year. That is about $2 on $10,000 held for a year. Fees come from each fund's prospectus.
Other comparisons
MBB vs SGOVBOXX vs MBBMBB vs MINTMBB vs VUSBVBIL vs VGITVBIL vs VCSHVBIL vs VTIPSCHP vs VBIL
Where to next
MBB on its own →VBIL on its own →Hold both: look the portfolio through →Rankings →MBB dividend history →MBB holdings →VBIL dividend history →VBIL holdings →Standards and sources →
Sources and dates
MBB filings on SEC EDGAR ↗
MBB prospectus with the expense ratio (SEC) ↗
iShares page for MBB ↗
VBIL filings on SEC EDGAR ↗
VBIL prospectus with the expense ratio (SEC) ↗
Vanguard page for VBIL ↗

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.

Cite this pageCitation, APA and Markdown

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

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Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.