Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IWM vs MTUM: how they differ
IWM and MTUM hold 0% of their weight in the same names, and MTUM returned more over the year.
iShares Russell 2000 ETF and iShares MSCI USA Momentum Factor ETF.
What they hold in common
By the books each fund has filed, IWM and MTUM hold 0% of their money in the same securities at the same weight.
| Only in IWM | Only in MTUM |
|---|---|
| Moog, Inc. 0.38% | MICRON TECHNOLOGY, INC. 5.57% |
| Hut 8 Corp. 0.37% | BROADCOM INC. 5.41% |
| Viasat, Inc. 0.35% | NVIDIA CORPORATION 4.65% |
| BrightSpring Health Services, Inc. 0.35% | ADVANCED MICRO DEVICES, INC. 4.04% |
| Cytokinetics, Inc. 0.35% | INTEL CORPORATION 3.84% |
| MaxLinear, Inc. 0.34% | JOHNSON & JOHNSON 3.76% |
| Argan, Inc. 0.34% | LAM RESEARCH CORPORATION 3.62% |
| UMB Financial Corp. 0.33% | EXXON MOBIL CORPORATION 3.44% |
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 Apr 30, 2026 and Jun 30, 2026.
| IWM iShares Russell 2000 ETF | MTUM iShares MSCI USA Momentum Factor ETF | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | iShares |
| What it is | Russell 2000 | MSCI USA Momentum Factor |
| Total return, 1 year | +21.2% | +21.8% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +3.7 pts | +4.3 pts |
| Expense ratio | 0.19% | 0.15% |
| Already in the S&P 500 | 0.0% | 98.2% |
| Holdings | 2014 | 125 |
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 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%. It sat 5.3% below its high of Aug 14, 2026 on Sep 11, 2026.
MTUM in plain words
MTUM is an index equity fund tracking the MSCI USA Momentum Factor. Over the year to Sep 11, 2026 it returned +21.8% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.15% a year. By its holdings filed for Apr 30, 2026, 98% of the fund by weight is stocks the S&P 500 also holds, across 125 positions, with the top ten at 40.5%. It sat 11.1% below its high of Jun 22, 2026 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, IWM or MTUM?
- In the year to Sep 12, 2026, with distributions reinvested, IWM returned +21.2% and MTUM returned +21.8%, so MTUM returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IWM or MTUM?
- IWM charges 0.19% a year and MTUM charges 0.15%, so MTUM is cheaper. Fees come from each fund's prospectus.
- How much do IWM and MTUM overlap with the S&P 500?
- By their latest filed holdings, 0% of IWM and 98% of MTUM 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, IWM against MTUM, data as of Sep 12, 2026. https://etfiq.com/compare/any/IWM-MTUM Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources