Data as of Sep 13, 2026. Both funds on the fields they both publish, from the same sources.
IWC vs IWM: how they differ
IWC and IWM hold 13% of their weight in the same names, and IWC returned more over the year.
iShares Micro-Cap ETF and iShares Russell 2000 ETF.
What they hold in common
By the books each fund has filed, IWC and IWM hold 13% of their money in the same securities at the same weight.
| Holding | IWC | IWM |
|---|---|---|
| USD CASH | 0.11% | 0.17% |
| CAREDX | 0.61% | 0.08% |
| NURIX THERAPEUTICS | 0.59% | 0.08% |
| PENGUIN SOLUTIONS INC | 0.58% | 0.08% |
| SELLAS LIFE SCIENCES GROUP INC | 0.60% | 0.08% |
| INTERFACE | 0.47% | 0.07% |
| OUSTER | 0.52% | 0.07% |
| VIRIDIAN THERAPEUTICS ORS | 0.48% | 0.07% |
| INNODATA | 0.40% | 0.06% |
| MBX BIOSCIENCES | 0.45% | 0.06% |
| QCR HOLDINGS INC | 0.40% | 0.06% |
| STRIVE INC CLASS A | 0.40% | 0.06% |
| Only in IWC | Only in IWM |
|---|---|
| AVITA MEDICAL INC 0.07% | MOOG INC CLASS A 0.34% |
| FATE THERAPEUTICS INC 0.06% | UMB FINANCIAL 0.34% |
| QUANTUM CORPORATION 0.06% | CYTOKINETICS 0.32% |
| CEA INDUSTRIES INC 0.05% | GLAUKOS 0.32% |
| TREACE MEDICAL CONCEPTS 0.05% | JFROG 0.32% |
| AIRO GROUP HOLDINGS INC 0.04% | BRIGHTSPRING HEALTH SERVICES INC 0.31% |
| ALTI GLOBAL INC CLASS A 0.04% | BRINKER INTERNATIONAL INC 0.31% |
| AMERICAN OUTDOOR BRANDS INC 0.04% | FIRSTCASH HOLDINGS INC 0.31% |
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 Sep 10, 2026.
| IWC iShares Micro-Cap ETF | IWM iShares Russell 2000 ETF | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | iShares |
| What it is | Russell Microcap | Russell 2000 |
| Total return, 1 year | +31.3% | +21.2% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +13.8 pts | +3.7 pts |
| Expense ratio | not published | 0.19% |
| Already in the S&P 500 | 91.9% | 0.0% |
| Holdings | 1252 | 1749 |
IWC in plain words
IWC is an index equity fund tracking the Russell Microcap. Over the year to Sep 11, 2026 it returned +31.3% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. By its holdings filed for Sep 10, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 1252 positions, with the top ten at 5.1%. It sat 5.0% below its high of Aug 14, 2026 on Sep 11, 2026.
IWM in plain words
IWM is an index equity fund tracking the Russell 2000. Over the year to Sep 11, 2026 it returned +21.2% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.19% a year. By its holdings filed for Sep 10, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 1749 positions, with the top ten at 3.2%. It sat 5.3% below its high of Aug 14, 2026 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, IWC or IWM?
- In the year to Sep 13, 2026, with distributions reinvested, IWC returned +31.3% and IWM returned +21.2%, so IWC returned more. One year is one year; the longer windows are in the table.
- How much do IWC and IWM overlap with the S&P 500?
- By their latest filed holdings, 92% of IWC and 0% of IWM by weight is stocks the S&P 500 already holds. Between the two funds, 13% 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, IWC against IWM, data as of Sep 13, 2026. https://etfiq.com/compare/any/iwc-vs-iwm Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources