Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IWB vs IWO: how they differ
IWB and IWO hold 0% of their weight in the same names.
iShares Russell 1000 ETF and iShares Russell 2000 Growth ETF.
What they hold in common
By the books each fund has filed, IWB and IWO hold 0% of their money in the same securities at the same weight.
| Only in IWB | Only in IWO |
|---|---|
| NVIDIA CORPORATION 6.73% | Moog, Inc. 0.73% |
| APPLE INC. 6.03% | BrightSpring Health Services, Inc. 0.68% |
| MICROSOFT CORPORATION 4.00% | MaxLinear, Inc. 0.67% |
| AMAZON.COM, INC. 3.33% | Argan, Inc. 0.66% |
| ALPHABET INC. 3.00% | JFrog Ltd. 0.60% |
| BROADCOM INC. 2.54% | Krystal Biotech, Inc. 0.58% |
| ALPHABET INC. 2.42% | ESCO Technologies, Inc. 0.56% |
| MICRON TECHNOLOGY, INC. 1.88% | FirstCash Holdings, Inc. 0.54% |
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.
| IWB iShares Russell 1000 ETF | IWO iShares Russell 2000 Growth ETF | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | iShares |
| What it is | Russell 1000 | Russell 2000 Growth |
| Total return, 1 year | +16.7% | +17.0% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −0.8 pts | −0.5 pts |
| Expense ratio | 0.15% | 0.24% |
| Already in the S&P 500 | 91.9% | 0.0% |
| Holdings | 1024 | 1133 |
IWB in plain words
IWB is an index equity fund tracking the Russell 1000. Over the year to Sep 11, 2026 it returned +16.7% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.15% a year. By its holdings filed for Jun 30, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 1024 positions, with the top ten at 33.5%.
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.
Questions people ask
- Which returned more over the last year, IWB or IWO?
- In the year to Sep 12, 2026, with distributions reinvested, IWB returned +16.7% and IWO returned +17.0%, so IWO returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IWB or IWO?
- IWB charges 0.15% a year and IWO charges 0.24%, so IWB is cheaper. Fees come from each fund's prospectus.
- How much do IWB and IWO overlap with the S&P 500?
- By their latest filed holdings, 92% of IWB and 0% of IWO 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, IWB against IWO, data as of Sep 12, 2026. https://etfiq.com/compare/any/IWB-IWO Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources