Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IWF vs VO: how they differ
IWF and VO hold 10% of their weight in the same names, and VO returned more over the year.
iShares Russell 1000 Growth ETF and Vanguard Mid-Cap Index Fund.
What they hold in common
By the books each fund has filed, IWF and VO hold 10% of their money in the same securities at the same weight.
| Holding | IWF | VO |
|---|---|---|
| WESTERN DIGITAL CORPORATION | 0.64% | 1.07% |
| VERTIV HOLDINGS CO | 0.38% | 1.23% |
| QUANTA SERVICES, INC. | 0.32% | 1.05% |
| HOWMET AEROSPACE INC. | 0.32% | 1.04% |
| FORTINET, INC. | 0.28% | 0.46% |
| DATADOG, INC. | 0.25% | 0.84% |
| SNOWFLAKE INC. | 0.25% | 0.41% |
| BLOOM ENERGY CORPORATION | 0.24% | 0.79% |
| CLOUDFLARE, INC. | 0.23% | 0.76% |
| TERADYNE, INC. | 0.23% | 0.73% |
| Astera Labs, Inc | 0.22% | 0.36% |
| HILTON WORLDWIDE HOLDINGS INC. | 0.22% | 0.36% |
| Only in IWF | Only in VO |
|---|---|
| NVIDIA CORPORATION 13.85% | Seagate Technology Holdings PLC 1.05% |
| APPLE INC. 6.72% | CRH PLC 0.69% |
| ALPHABET INC. 6.18% | General Motors Co 0.67% |
| BROADCOM INC. 5.21% | SLB Ltd 0.67% |
| ALPHABET INC. 4.98% | Warner Bros Discovery Inc 0.62% |
| MICROSOFT CORPORATION 4.11% | PACCAR Inc 0.61% |
| MICRON TECHNOLOGY, INC. 3.86% | Digital Realty Trust Inc 0.61% |
| TESLA, INC. 3.65% | Allstate Corp/The 0.59% |
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.
| IWF iShares Russell 1000 Growth ETF | VO Vanguard Mid-Cap Index Fund | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | Vanguard |
| What it is | Russell 1000 growth | Mid-Cap |
| Total return, 1 year | +7.0% | +12.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −10.5 pts | −5.5 pts |
| Expense ratio | 0.18% | 0.03% |
| Already in the S&P 500 | 93.6% | 91.4% |
| Holdings | 368 | 282 |
IWF in plain words
IWF is an index equity fund tracking the Russell 1000 growth. Over the year to Sep 11, 2026 it returned +7.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.18% a year. By its holdings filed for Jun 30, 2026, 94% of the fund by weight is stocks the S&P 500 also holds, across 368 positions, with the top ten at 54.4%. It sat 5.0% below its high of Jun 1, 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, IWF or VO?
- In the year to Sep 12, 2026, with distributions reinvested, IWF returned +7.0% and VO returned +12.0%, so VO returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IWF or VO?
- IWF charges 0.18% a year and VO charges 0.03%, so VO is cheaper. Fees come from each fund's prospectus.
- How much do IWF and VO overlap with the S&P 500?
- By their latest filed holdings, 94% of IWF and 91% of VO by weight is stocks the S&P 500 already holds. Between the two funds, 10% 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, IWF against VO, data as of Sep 12, 2026. https://etfiq.com/compare/any/IWF-VO Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources