Data as of Oct 28, 2026.
MBB vs VBK: Differences, Returns & Fees
Over the year to Oct 28, 2026, MBB returned −0.8% to VBK's +10.3%; 0% of their weight is in the same names.
askIQ about this page
askIQ about MBB and VBK
Net assets: $35.5bn on Oct 28, 2026 for iShares MBS ETF, and $22.8bn on Sep 30, 2026 for Vanguard Morningstar Small-Cap Growth ETF.
Pair scorecard
MBB costs 0.01 points a year less; their one-year returns differ by 11.1 points; MBB is 1.6 times larger.
| Measure | MBB | VBK |
|---|---|---|
| Return | ||
| Total return, 1 year | −0.8% | +10.3% |
| Drawdown | ||
| Below its high | 8.0%, high on Aug 17, 2026 | |
| Benchmark | ||
| What it tracks | Bloomberg U.S. MBS Index | Morningstar US Small Cap Growth Index |
| Cost and size | ||
| Expense ratio | 0.04% | 0.05% |
| Net assets, as of Sep 30, 2026 | $36.2bn | $22.8bn |
| Holdings | ||
| Holdings in common | 0% | |
| In the S&P 500, by weight | 10% | |
| Top ten holdings, share of the fund | 12.2% | |
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 VBK 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 VBK 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.
VBK
VBK tracks an index of Small-Cap Growth. Over the year to Oct 28, 2026 it returned +10.3% with distributions reinvested. The prospectus expense ratio is 0.05% a year. By its holdings published by its issuer as of Sep 30, 2026, 10% of the fund by weight is stocks the S&P 500 also holds, across 554 positions, with the top ten at 12.2%. It sat 8.0% below its high of Aug 17, 2026 on Oct 28, 2026.
Questions people ask
- Which returned more over the last year, MBB or VBK?
- In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and VBK +10.3%.
- Which is cheaper, MBB or VBK?
- MBB 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.
Cite this pageCitation, APA and Markdown
ETFIQ, MBB against VBK, data as of Oct 28, 2026. https://etfiq.com/compare/any/mbb-vs-vbk
ETFIQ. (Oct 28, 2026). MBB against VBK. Retrieved from https://etfiq.com/compare/any/mbb-vs-vbk
[MBB against VBK (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/mbb-vs-vbk)
Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.