Data as of Oct 28, 2026.
MBB vs VB: Differences, Returns & Fees
Over the year to Oct 28, 2026, MBB returned −0.8% to VB's +14.4%; 0% of their weight is in the same names.
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Net assets: $35.5bn on Oct 28, 2026 for iShares MBS ETF, and $76.9bn on Sep 30, 2026 for Vanguard Morningstar Small-Cap ETF.
Pair scorecard
VB costs 0.01 points a year less; their one-year returns differ by 15.2 points; VB is 2.1 times larger.
| Measure | MBB | VB |
|---|---|---|
| Return | ||
| Total return, 1 year | −0.8% | +14.4% |
| Drawdown | ||
| Below its high | 5.7%, high on Aug 14, 2026 | |
| Benchmark | ||
| What it tracks | Bloomberg U.S. MBS Index | Morningstar US Small Cap Index |
| Cost and size | ||
| Expense ratio | 0.04% | 0.03% |
| Net assets, as of Sep 30, 2026 | $36.2bn | $76.9bn |
| Holdings | ||
| Holdings in common | 0% | |
| In the S&P 500, by weight | 22% | |
| Top ten holdings, share of the fund | 5.9% | |
Holdings in common uses holdings dated Sep 30, 2026 and Oct 27, 2026. Method
What they share
By the books each fund has filed, MBB and VB hold 0% of their money in the same securities at the same weight. Holdings dated Sep 30, 2026 and Oct 27, 2026.
half
0% in common
Only in one fund ↓
Side by side
MBB and VB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
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.
VB
VB tracks an index of Small-Cap. Over the year to Oct 28, 2026 it returned +14.4% with distributions reinvested. The prospectus expense ratio is 0.03% a year. By its holdings published by its issuer as of Sep 30, 2026, 22% of the fund by weight is stocks the S&P 500 also holds, across 1,303 positions, with the top ten at 5.9%. It sat 5.7% below its high of Aug 14, 2026 on Oct 28, 2026.
Questions people ask
- Which returned more over the last year, MBB or VB?
- In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and VB +14.4%.
- Which is cheaper, MBB or VB?
- VB 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.
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 VB, data as of Oct 28, 2026. https://etfiq.com/compare/any/mbb-vs-vb
ETFIQ. (Oct 28, 2026). MBB against VB. Retrieved from https://etfiq.com/compare/any/mbb-vs-vb
[MBB against VB (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/mbb-vs-vb)
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