Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IWB vs VOO: how they differ
IWB and VOO hold 92% of their weight in the same names, and VOO returned more over the year.
iShares Russell 1000 ETF and Vanguard 500 Index Fund.
What they hold in common
By the books each fund has filed, IWB and VOO hold 92% of their money in the same securities at the same weight.
| Holding | IWB | VOO |
|---|---|---|
| NVIDIA CORPORATION | 6.73% | 7.53% |
| APPLE INC. | 6.03% | 6.61% |
| MICROSOFT CORPORATION | 4.00% | 4.31% |
| AMAZON.COM, INC. | 3.33% | 3.63% |
| ALPHABET INC. | 3.00% | 3.26% |
| BROADCOM INC. | 2.54% | 2.78% |
| ALPHABET INC. | 2.42% | 2.60% |
| MICRON TECHNOLOGY, INC. | 1.88% | 2.02% |
| META PLATFORMS, INC. | 1.79% | 1.92% |
| TESLA, INC. | 1.77% | 1.84% |
| ELI LILLY AND COMPANY | 1.38% | 1.48% |
| ADVANCED MICRO DEVICES, INC. | 1.36% | 1.47% |
| Only in IWB | Only in VOO |
|---|---|
| SPACE EXPLORATION TECHNOLOGIES CORP. 0.13% | Seagate Technology Holdings PLC 0.34% |
| SNOWFLAKE INC. 0.12% | NXP Semiconductors NV 0.11% |
| BLOOM ENERGY CORPORATION 0.12% | TE Connectivity PLC 0.09% |
| CLOUDFLARE, INC. 0.11% | Amcor PLC 0.03% |
| Astera Labs, Inc 0.11% | Erie Indemnity Co 0.01% |
| SPOTIFY TECHNOLOGY S.A. 0.10% | Paramount Skydance Corp 0.01% |
| ROCKET LAB CORPORATION 0.08% | ABIOMED Inc 0.00% |
| CHENIERE ENERGY, INC. 0.07% | Hologic Inc 0.00% |
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 | VOO Vanguard 500 Index Fund | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | Vanguard |
| What it is | Russell 1000 | S&P 500 |
| Total return, 1 year | +16.7% | +17.6% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −0.8 pts | +0.1 pts |
| Expense ratio | 0.15% | 0.03% |
| Already in the S&P 500 | 91.9% | 100.0% |
| Holdings | 1024 | 506 |
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%.
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, IWB or VOO?
- In the year to Sep 12, 2026, with distributions reinvested, IWB returned +16.7% and VOO returned +17.6%, so VOO returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IWB or VOO?
- IWB charges 0.15% a year and VOO charges 0.03%, so VOO is cheaper. Fees come from each fund's prospectus.
- How much do IWB and VOO overlap with the S&P 500?
- By their latest filed holdings, 92% of IWB and 100% of VOO by weight is stocks the S&P 500 already holds. Between the two funds, 92% 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 VOO, data as of Sep 12, 2026. https://etfiq.com/compare/any/IWB-VOO Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources