Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IWO vs VOO: how they differ
IWO and VOO hold 0% of their weight in the same names, and VOO returned more over the year.
iShares Russell 2000 Growth ETF and Vanguard 500 Index Fund.
What they hold in common
By the books each fund has filed, IWO and VOO hold 0% of their money in the same securities at the same weight.
| Only in IWO | Only in VOO |
|---|---|
| Moog, Inc. 0.73% | NVIDIA Corp 7.53% |
| BrightSpring Health Services, Inc. 0.68% | Apple Inc 6.61% |
| MaxLinear, Inc. 0.67% | Microsoft Corp 4.31% |
| Argan, Inc. 0.66% | Amazon.com Inc 3.63% |
| JFrog Ltd. 0.60% | Alphabet Inc 3.26% |
| Krystal Biotech, Inc. 0.58% | Broadcom Inc 2.78% |
| ESCO Technologies, Inc. 0.56% | Alphabet Inc 2.60% |
| FirstCash Holdings, Inc. 0.54% | Micron Technology Inc 2.02% |
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.
| IWO iShares Russell 2000 Growth ETF | VOO Vanguard 500 Index Fund | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | Vanguard |
| What it is | Russell 2000 Growth | S&P 500 |
| Total return, 1 year | +17.0% | +17.6% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −0.5 pts | +0.1 pts |
| Expense ratio | 0.24% | 0.03% |
| Already in the S&P 500 | 0.0% | 100.0% |
| Holdings | 1133 | 506 |
IWO in plain words
IWO is an index equity fund tracking the Russell 2000 Growth. Over the year to Sep 11, 2026 it returned +17.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.24% a year. By its holdings filed for Jun 30, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 1133 positions, with the top ten at 6.1%. It sat 7.1% below its high of Aug 14, 2026 on Sep 11, 2026.
VOO in plain words
VOO is an index equity fund tracking the S&P 500. Over the year to Sep 11, 2026 it returned +17.6% 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, 100% of the fund by weight is stocks the S&P 500 also holds, across 506 positions, with the top ten at 36.5%.
Questions people ask
- Which returned more over the last year, IWO or VOO?
- In the year to Sep 12, 2026, with distributions reinvested, IWO returned +17.0% and VOO returned +17.6%, so VOO returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IWO or VOO?
- IWO charges 0.24% a year and VOO charges 0.03%, so VOO is cheaper. Fees come from each fund's prospectus.
- How much do IWO and VOO overlap with the S&P 500?
- By their latest filed holdings, 0% of IWO and 100% of VOO by weight is stocks the S&P 500 already holds. Between the two funds, 0% 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, IWO against VOO, data as of Sep 12, 2026. https://etfiq.com/compare/any/IWO-VOO Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources