Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IWB vs VBK: how they differ
IWB and VBK hold 4% of their weight in the same names, and IWB returned more over the year.
iShares Russell 1000 ETF and Vanguard Small-Cap Growth Index Fund.
What they hold in common
By the books each fund has filed, IWB and VBK hold 4% of their money in the same securities at the same weight.
| Holding | IWB | VBK |
|---|---|---|
| Astera Labs, Inc | 0.11% | 1.05% |
| FLEX LTD. | 0.09% | 0.42% |
| Credo Technology Group Holding Ltd | 0.07% | 1.27% |
| EMCOR GROUP, INC. | 0.05% | 0.52% |
| NATERA, INC. | 0.05% | 1.04% |
| REVOLUTION MEDICINES, INC. | 0.05% | 1.07% |
| EQT CORPORATION | 0.05% | 0.23% |
| TWILIO INC. | 0.04% | 0.88% |
| CARPENTER TECHNOLOGY CORPORATION | 0.04% | 0.82% |
| CASEY'S GENERAL STORES, INC. | 0.04% | 0.83% |
| MKS, INCORPORATED. | 0.04% | 0.42% |
| CURTISS-WRIGHT CORPORATION | 0.04% | 0.79% |
| Only in IWB | Only in VBK |
|---|---|
| NVIDIA CORPORATION 6.73% | Hut 8 Corp 0.33% |
| APPLE INC. 6.03% | Cytokinetics Inc 0.33% |
| MICROSOFT CORPORATION 4.00% | BrightSpring Health Services Inc 0.32% |
| AMAZON.COM, INC. 3.33% | MaxLinear Inc 0.31% |
| ALPHABET INC. 3.00% | Argan Inc 0.30% |
| BROADCOM INC. 2.54% | Krystal Biotech Inc 0.29% |
| ALPHABET INC. 2.42% | CareTrust REIT Inc 0.27% |
| MICRON TECHNOLOGY, INC. 1.88% | Cipher Digital Inc 0.27% |
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 | VBK Vanguard Small-Cap Growth Index Fund | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | Vanguard |
| What it is | Russell 1000 | Small-Cap Growth |
| Total return, 1 year | +16.7% | +13.8% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −0.8 pts | −3.7 pts |
| Expense ratio | 0.15% | 0.05% |
| Already in the S&P 500 | 91.9% | 10.2% |
| Holdings | 1024 | 545 |
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%.
VBK in plain words
VBK is an index equity fund tracking the Small-Cap Growth. Over the year to Sep 11, 2026 it returned +13.8% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.05% a year. By its holdings filed for Jun 30, 2026, 10% of the fund by weight is stocks the S&P 500 also holds, across 545 positions, with the top ten at 9.3%. It sat 7.0% below its high of Aug 17, 2026 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, IWB or VBK?
- In the year to Sep 12, 2026, with distributions reinvested, IWB returned +16.7% and VBK returned +13.8%, so IWB returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IWB or VBK?
- IWB charges 0.15% a year and VBK charges 0.05%, so VBK is cheaper. Fees come from each fund's prospectus.
- How much do IWB and VBK overlap with the S&P 500?
- By their latest filed holdings, 92% of IWB and 10% of VBK by weight is stocks the S&P 500 already holds. Between the two funds, 4% 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 VBK, data as of Sep 12, 2026. https://etfiq.com/compare/any/IWB-VBK Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources