Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
VBK vs VO: how they differ
VBK and VO hold 2% of their weight in the same names, and VBK returned more over the year.
Vanguard Small-Cap Growth Index Fund and Vanguard Mid-Cap Index Fund.
What they hold in common
By the books each fund has filed, VBK and VO hold 2% of their money in the same securities at the same weight.
| Holding | VBK | VO |
|---|---|---|
| Astera Labs Inc | 1.05% | 0.36% |
| Flex Ltd | 0.42% | 0.29% |
| EQT Corp | 0.23% | 0.16% |
| Hubbell Inc | 0.20% | 0.13% |
| Texas Pacific Land Corp | 0.36% | 0.12% |
| AST SpaceMobile Inc | 0.35% | 0.12% |
| First Solar Inc | 0.34% | 0.12% |
| Insmed Inc | 0.33% | 0.11% |
| Burlington Stores Inc | 0.28% | 0.10% |
| TKO Group Holdings Inc | 0.17% | 0.06% |
| CoStar Group Inc | 0.16% | 0.06% |
| Symbotic Inc | 0.04% | 0.01% |
| Only in VBK | Only in VO |
|---|---|
| Credo Technology Group Holding Ltd 1.27% | Vertiv Holdings Co 1.23% |
| REVOLUTION Medicines Inc 1.07% | Western Digital Corp 1.07% |
| Natera Inc 1.04% | Seagate Technology Holdings PLC 1.05% |
| Twilio Inc 0.88% | Quanta Services Inc 1.05% |
| Casey's General Stores Inc 0.83% | Howmet Aerospace Inc 1.04% |
| Carpenter Technology Corp 0.82% | Cummins Inc 0.95% |
| Curtiss-Wright Corp 0.79% | Datadog Inc 0.84% |
| FTAI Aviation Ltd 0.78% | Bloom Energy Corp 0.79% |
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 Jun 30, 2026.
| VBK Vanguard Small-Cap Growth Index Fund | VO Vanguard Mid-Cap Index Fund | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | Vanguard | Vanguard |
| What it is | Small-Cap Growth | Mid-Cap |
| Total return, 1 year | +13.8% | +12.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −3.7 pts | −5.5 pts |
| Expense ratio | 0.05% | 0.03% |
| Already in the S&P 500 | 10.2% | 91.4% |
| Holdings | 545 | 282 |
VBK in plain words
VBK is an index equity fund tracking the Small-Cap Growth. Over the year to Sep 11, 2026 it returned +13.8% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.05% a year. By its holdings filed for Jun 30, 2026, 10% of the fund by weight is stocks the S&P 500 also holds, across 545 positions, with the top ten at 9.3%. It sat 7.0% below its high of Aug 17, 2026 on Sep 11, 2026.
VO in plain words
VO is an index equity fund tracking the Mid-Cap. Over the year to Sep 11, 2026 it returned +12.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.03% a year. By its holdings filed for Jun 30, 2026, 91% of the fund by weight is stocks the S&P 500 also holds, across 282 positions, with the top ten at 9.6%. It sat 4.1% below its high of Aug 14, 2026 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, VBK or VO?
- In the year to Sep 12, 2026, with distributions reinvested, VBK returned +13.8% and VO returned +12.0%, so VBK returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, VBK or VO?
- VBK charges 0.05% a year and VO charges 0.03%, so VO is cheaper. Fees come from each fund's prospectus.
- How much do VBK and VO overlap with the S&P 500?
- By their latest filed holdings, 10% of VBK and 91% of VO by weight is stocks the S&P 500 already holds. Between the two funds, 2% of their books are the same securities at the same weight.
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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, VBK against VO, data as of Sep 12, 2026. https://etfiq.com/compare/any/VBK-VO Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources