Data as of Sep 4, 2026. Both funds on the fields they both publish, from the same sources.
IWM vs VOO
iShares Russell 2000 ETF and Vanguard 500 Index Fund.
What they hold in common
By the books each fund has filed, IWM and VOO hold 0% of their money in the same securities at the same weight.
| Only in IWM | Only in VOO |
|---|---|
| Moog, Inc. 0.38% | NVIDIA Corp 7.53% |
| Hut 8 Corp. 0.37% | Apple Inc 6.61% |
| Viasat, Inc. 0.35% | Microsoft Corp 4.31% |
| BrightSpring Health Services, Inc. 0.35% | Amazon.com Inc 3.63% |
| Cytokinetics, Inc. 0.35% | Alphabet Inc 3.26% |
| MaxLinear, Inc. 0.34% | Broadcom Inc 2.78% |
| Argan, Inc. 0.34% | Alphabet Inc 2.60% |
| UMB Financial Corp. 0.33% | 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 as filed for Jun 30, 2026.
| IWM iShares Russell 2000 ETF | VOO Vanguard 500 Index Fund | |
|---|---|---|
| Where it sits | Core fund | Core fund |
| Issuer | iShares | Vanguard |
| What it is | Russell 2000 | S&P 500 |
| Total return, 1 year | +26.4% | +20.1% |
| S&P 500 over the same days | +20.0% | +20.0% |
| Gap to the S&P 500 | +6.5 pts | +0.1 pts |
| Expense ratio | 0.19% | 0.03% |
| Already in the S&P 500 | 0.0% | 100.0% |
| Holdings | 2014 | 506 |
IWM in plain words
IWM is a index equity fund tracking Russell 2000. Over the year to Sep 4, 2026 it returned +26.4% with distributions reinvested, against +20.0% for the S&P 500 and +25.6% for the Nasdaq-100. The prospectus expense ratio is 0.19% 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 2014 positions, with the top ten at 3.4%.
VOO in plain words
VOO is a index equity fund tracking S&P 500. Over the year to Sep 4, 2026 it returned +20.1% with distributions reinvested, against +20.0% for the S&P 500 and +25.6% 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, IWM or VOO?
- In the year to Sep 4, 2026, with distributions reinvested, IWM returned +26.4% and VOO returned +20.1%, so IWM returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IWM or VOO?
- IWM charges 0.19% a year and VOO charges 0.03%, so VOO is cheaper. Fees come from each fund's prospectus.
- How much do IWM and VOO overlap with the S&P 500?
- By their latest filed holdings, 0% of IWM 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.
Other comparisons
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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, IWM against VOO, data as of Sep 4, 2026. https://etfiq.com/compare/any/IWM-VOO.html Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources